Moving cursor when maxlength in jQuery [duplicate] - javascript
How can I focus the next input once the previous input has reached its maxlength value?
a: <input type="text" maxlength="5" />
b: <input type="text" maxlength="5" />
c: <input type="text" maxlength="5" />
If a user pastes text that is greater than the maxlength, ideally it should spill into the next input.
jsFiddle: http://jsfiddle.net/4m5fg/1/
I must stress that I do not want to use a plugin, as I'd much rather learn the logic behind this, than use something that already exists. Thanks for understanding.
No jQuery used and is a very clean implementation:
Reads from the maxlength attribute.
Scales to any number of inputs inside of your container.
Automatically finds the next input to focus.
No jQuery.
http://jsfiddle.net/4m5fg/5/
<div class="container">
a: <input type="text" maxlength="5" />
b: <input type="text" maxlength="5" />
c: <input type="text" maxlength="5" />
</div>
..
var container = document.getElementsByClassName("container")[0];
container.onkeyup = function(e) {
var target = e.srcElement || e.target;
var maxLength = parseInt(target.attributes["maxlength"].value, 10);
var myLength = target.value.length;
if (myLength >= maxLength) {
var next = target;
while (next = next.nextElementSibling) {
if (next == null)
break;
if (next.tagName.toLowerCase() === "input") {
next.focus();
break;
}
}
}
// Move to previous field if empty (user pressed backspace)
else if (myLength === 0) {
var previous = target;
while (previous = previous.previousElementSibling) {
if (previous == null)
break;
if (previous.tagName.toLowerCase() === "input") {
previous.focus();
break;
}
}
}
}
You can watch for input in the fields and test its value:
$("input").bind("input", function() {
var $this = $(this);
setTimeout(function() {
if ( $this.val().length >= parseInt($this.attr("maxlength"),10) )
$this.next("input").focus();
},0);
});
Working demo.
The setTimeout is there to ensure the code will only run after the input is completed and the value updated. Binding input ensures most types of input will trigger the event, including key presses, copy/paste (even from mouse) and drag & drop (though in this case, the latter won't work, since the focus was on the draggable, not the droppable).
Note: on some older browsers, you might also need to bind propertychange.
If a user pastes text that is greater than the maxlength, ideally it should spill into the next input.
To do that, you might need to remove the maxlength attribute using JavaScript (to be able to capture the full input), and implement that functionality yourself. I made a small example, relevant parts below:
$("input").each(function() {
var $this = $(this);
$(this).data("maxlength", $this.prop("maxlength"));
$(this).removeAttr("maxlength");
})
This removes the attribute, but saves it in data, so you can access it later.
function spill($this, val) {
var maxlength = $this.data("maxlength");
if ( val.length >= maxlength ) {
$this.val(val.substring(0, maxlength));
var next = $this.next("input").focus();
spill(next, val.substring(maxlength));
}
else
$this.val(val);
}
Here the max length logic is reintroduced in JavaScript, as well as getting the "discarded" part and using it in a recursive call to spill. If there's no next element, the call to data will return undefined and the loop will stop, so the input will be truncated in the last field.
You can use plain JavaScript:
See DEMO.
Check the character length with el.value.length. If it is equal to the maximum value, move to the next field by using focus(). Bind this function to the keyup event with onkeyup so that the function fires every time after the user keys in a character.
var a = document.getElementById("a"),
b = document.getElementById("b"),
c = document.getElementById("c");
a.onkeyup = function() {
if (this.value.length === parseInt(this.attributes["maxlength"].value)) {
b.focus();
}
}
b.onkeyup = function() {
if (this.value.length === parseInt(this.attributes["maxlength"].value)) {
c.focus();
}
}
if you are going to have many fields you can do something like this.
basically on keyup get the length of the input and then compare it to the maxlength, if matches, then focus onto the next input field.
http://jsfiddle.net/btevfik/DVxDA/
$(document).ready(function(){
$('input').keyup(function(){
if(this.value.length==$(this).attr("maxlength")){
$(this).next().focus();
}
});
});
let otp = document.querySelector('#otp-screen');
for(let pin of otp.children) {
pin.onkeyup = function() {
if(pin.nextElementSibling) {
pin.nextElementSibling.focus();
}
}
}
<div class="otp-screen" id="otp-screen">
<input type="text" placeholder="0" maxlength="1"/>
<input type="text" placeholder="0" maxlength="1"/>
<input type="text" placeholder="0" maxlength="1"/>
<input type="text" placeholder="0" maxlength="1"/>
</div>
Updated btevfik code, Onkeyup or onkeydown will create issue as you won't be able to delete the previous input on tab navigation. It will be tough to edit or change the text inside the input box as it will be limited to maxlength. So we can use oninput event to achieve the task.
DEMO
HTML
<ul>
<li>a: <input type="text" maxlength="5" /></li>
<li>b: <input type="text" maxlength="3" /></li>
<li>c: <input type="text" maxlength="5" /></li>
<li>d: <input type="text" maxlength="3" /></li>
<li>e: <input type="text" maxlength="6" /></li>
<li>f: <input type="text" maxlength="10" /></li>
<li>g: <input type="text" maxlength="7" /></li>
</ul>
Javascript
$(document).ready(function(){
$('input').on("input", function(){
if($(this).val().length==$(this).attr("maxlength")){
$(this).next().focus();
}
});
});
CSS
ul {list-style-type:none;}
li {padding:5px 5px;}
Other answers do give some idea how this can be implemented, but I find that they do not consider some minor things among which are:
The fact, that you do not want to auto-focus any elements across whole page, but rather within specific form.
Input elements can be wrapped in some other elements (for example I wrap them in span or div to allow floating labels through CSS, and I've seen forms that use table to for structure).
Validity of the field, when spilling over or moving to next one automatically.
Input events when spilling over.
Cursor position when returning to previous field (it looks like it can be saved by browser, thus backspacing can focus not in the end of the field, but, for example, in the middle).
Below code is trying to account to all of this, at least. Most of it can be tested on codepen: paste-spilling does not work there, looks like because of Clipboard API (other codepens with it do not work for me either).
Let me know if anything is unclear in the code, I'll update my answer and the code. If you find some edge case that is not covered - let me know as well.
For paste-spilling test using form from codepen, you can use something like this: 123456789123456789012345678903454353434534
Video sample of how it works in a more "live" envitonment on youtube
//List of input types, that are "textual" by default, thus can be tracked through keypress and paste events. In essence,
// these are types, that support maxlength attribute
const textInputTypes = ['email', 'password', 'search', 'tel', 'text', 'url', ];
formInit();
//Add listeners
function formInit()
{
document.querySelectorAll('form input').forEach((item)=>{
if (textInputTypes.includes(item.type)) {
//Somehow backspace can be tracked only on keydown, not keypress
item.addEventListener('keydown', inputBackSpace);
if (item.getAttribute('maxlength')) {
item.addEventListener('input', autoNext);
item.addEventListener('change', autoNext);
item.addEventListener('paste', pasteSplit);
}
}
});
}
//Track backspace and focus previous input field, if input is empty, when it's pressed
function inputBackSpace(event)
{
let current = event.target;
if ((event.keyCode || event.charCode || 0) === 8 && !current.value) {
let moveTo = nextInput(current, true);
if (moveTo) {
moveTo.focus();
//Ensure, that cursor ends up at the end of the previous field
moveTo.selectionStart = moveTo.selectionEnd = moveTo.value.length;
}
}
}
//Focus next field, if current is filled to the brim and valid
function autoNext(event)
{
let current = event.target;
//Get length attribute
let maxLength = parseInt(current.getAttribute('maxlength'));
//Check it against value length
if (maxLength && current.value.length === maxLength && current.validity.valid) {
let moveTo = nextInput(current, false);
if (moveTo) {
moveTo.focus();
}
}
}
async function pasteSplit(event)
{
let permission = await navigator.permissions.query({ name: 'clipboard-read',});
//Check permission is granted or not
if (permission.state === 'denied') {
//It's explicitly denied, thus cancelling action
return false;
}
//Get buffer
navigator.clipboard.readText().then(result => {
let buffer = result.toString();
//Get initial element
let current = event.target;
//Get initial length attribute
let maxLength = parseInt(current.getAttribute('maxlength'));
//Loop while the buffer is too large
while (current && maxLength && buffer.length > maxLength) {
//Ensure input value is updated
current.value = buffer.substring(0, maxLength);
//Trigger input event to bubble any bound events
current.dispatchEvent(new Event('input', {
bubbles: true,
cancelable: true,
}));
//Do not spill over if a field is invalid
if (!current.validity.valid) {
return false;
}
//Update buffer value (not the buffer itself)
buffer = buffer.substring(maxLength);
//Get next node
current = nextInput(current);
if (current) {
//Focus to provide visual identification of a switch
current.focus();
//Update maxLength
maxLength = parseInt(current.getAttribute('maxlength'));
}
}
//Check if we still have a valid node
if (current) {
//Dump everything we can from leftovers
current.value = buffer;
//Trigger input event to bubble any bound events
current.dispatchEvent(new Event('input', {
bubbles: true,
cancelable: true,
}));
}
}).catch(err => {
//Most likely user denied request. Check status
navigator.permissions.query({ name: 'clipboard-read',}).then(newPerm => {
if (newPerm.state === 'granted') {
console.log('Failed to read clipboard', err);
} else {
console.log('Request denied by user. Show him some notification to explain why enabling permission may be useful');
}
}).catch(errPerm => {
console.log('Failed to read clipboard', errPerm);
});
});
}
//Find next/previous input
function nextInput(initial, reverse = false)
{
//Get form
let form = initial.form;
//Iterate inputs inside the form. Not using previousElementSibling, because next/previous input may not be a sibling on the same level
if (form) {
let previous;
for (let moveTo of form.querySelectorAll('input')) {
if (reverse) {
//Check if current element in loop is the initial one, meaning
if (moveTo === initial) {
//If previous is not empty - share it. Otherwise - false, since initial input is first in the form
if (previous) {
return previous;
} else {
return false;
}
}
} else {
//If we are moving forward and initial node is the previous one
if (previous === initial) {
return moveTo;
}
}
//Update previous input
previous = moveTo;
}
}
return false;
}
If you are adding input text fields dynamically then you can try this.
This will re-inject the script into the DOM and works Perfectly.
$('body').on('keyup', '#num_1',function(){
if (this.value.length === parseInt(this.attributes["maxlength"].value)) {
$('#num_2').focus();
}
})
$('body').on('keyup','#num_2', function(){
if (this.value.length === parseInt(this.attributes["maxlength"].value)) {
$('#num_3').focus();
}
})
<input type="text" class="form-control" name="number" maxlength="3" id="num_1">
<input type="text" class="form-control" name="number" maxlength="3" id="num_2">
<input type="text" class="form-control" name="number" maxlength="4" id="num_3">
If you're focused on creating card(debit/credit) number input type. Then clean an easily manageable jQuery version as follows:
/*..............................................................................................
* jQuery function for Credit card number input group
......................................................................................................*/
// make container label of input groups, responsible
$('.card-box').on('focus', function(e){
$(this).parent().addClass('focus-form-control');
});
$('.card-box').on('blur', function(e){
$(this).parent().removeClass('focus-form-control');
});
$('.card-box-1').on('keyup', function(e){
e.preventDefault();
var max_length = parseInt($(this).attr('maxLength'));
var _length = parseInt($(this).val().length);
if(_length >= max_length) {
$('.card-box-2').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
if(_length <= 0){
return;
}
});
$('.card-box-2').on('keyup', function(e){
e.preventDefault();
var max_length = parseInt($(this).attr('maxLength'));
var _length = parseInt($(this).val().length);
if(_length >= max_length) {
$('.card-box-3').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
if(_length <= 0){
$('.card-box-1').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
});
$('.card-box-3').on('keyup', function(e){
e.preventDefault();
var max_length = parseInt($(this).attr('maxLength'));
var _length = parseInt($(this).val().length);
if(_length >= max_length) {
$('.card-box-4').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
if(_length <= 0){
$('.card-box-2').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
});
$('.card-box-4').on('keyup', function(e){
e.preventDefault();
var max_length = parseInt($(this).attr('maxLength'));
var _length = parseInt($(this).val().length);
if(_length >= max_length) {
return;
}
if(_length <= 0){
$('.card-box-3').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
});
/*..............................................................................................
* End jQuery function for Credit card number input group
......................................................................................................*/
/* Hide HTML5 Up and Down arrows. */
input[type="number"]::-webkit-outer-spin-button, input[type="number"]::-webkit-inner-spin-button {
-webkit-appearance: none; margin: 0;
}
input[type="number"] { -moz-appearance: textfield; }
.card-box {
width: 20%; display: inline-block; height: 100%; border: none;
}
.focus-form-control {
border-color: #66afe9; outline: 0;-webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, .6);
box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, .6);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div class="form-control" style="padding: 0; max-width: 300px; ">
<input class="card-box card-box-1" type="number" id="CreditCard_CardNumber1" required step="1" minlength="4" maxlength="4" pattern="[0-9]{4}" value="" placeholder="0000"
onClick="this.setSelectionRange(0, this.value.length)" oninput="this.value=this.value.slice(0,this.maxLength||'');this.value=(this.value < 1) ? ('') : this.value;"/>
<input class="card-box card-box-2" type="number" id="CreditCard_CardNumber2" readonly required step="1" minlength="4" maxlength="4" pattern="[0-9]{4}" value="" placeholder="0000"
onClick="this.setSelectionRange(0, this.value.length)" oninput="this.value=this.value.slice(0,this.maxLength||'');this.value=(this.value < 1) ? ('') : this.value;" />
<input class="card-box card-box-3" type="number" id="CreditCard_CardNumber3" readonly required step="1" minlength="4" maxlength="4" pattern="[0-9]{4}" value="" placeholder="0000"
onClick="this.setSelectionRange(0, this.value.length)" oninput="this.value=this.value.slice(0,this.maxLength||'');this.value=(this.value < 1) ? ('') : this.value;" />
<input class="card-box card-box-4" type="number" id="CreditCard_CardNumber4" readonly required step="1" minlength="4" maxlength="4" pattern="[0-9]{4}" value="" placeholder="0000"
onClick="this.setSelectionRange(0, this.value.length)" oninput="this.value=this.value.slice(0,this.maxLength||'');this.value=(this.value < 1) ? ('') : this.value;" />
</div>
Verified Answer have one issue which focus previous field if previous field have valid length
I have Modified Above Answer to fix complete length of previous tag
var container = document.getElementsByClassName("container")[0];
container.onkeyup = function(e) {
var target = e.srcElement || e.target;
var maxLength = parseInt(target.attributes["maxlength"].value, 10);
var myLength = target.value.length;
if (myLength >= maxLength) {
var next = target;
while (next = next.nextElementSibling) {
if (next == null)
break;
if (next.tagName.toLowerCase() === "input") {
next.focus();
break;
}
}
}
// Move to previous field if empty (user pressed backspace)
else if (myLength === 0) {
var previous = target;
// Move to previous field if backspace is pressed
if (code == 8) {
previous = previous.previousElementSibling;
if (previous != null) {
if (previous.tagName.toLowerCase() === "input") {
previous.focus();
}
}
} else {
while (previous = previous.previousElementSibling) {
if (previous == null)
break;
if (previous.tagName.toLowerCase() === "input") {
var mLength = parseInt(previous.attributes["maxlength"].value, 10);
var pMyLength = previous.value.length;
// Move to previous field if it does not have required length
if (mLength == pMyLength) {
break;
} else {
previous.focus();
break;
}
}
}
}
}
}
I think this is a shorter way. As long as you use a specific structure in HTML
const inputHandler = (event) => {
if (event.target.nodeName == "INPUT" && event.target.nextElementSibling != null) {
event.target.nextElementSibling.focus();
}
}
<div class="enter-code">
<input type="text" maxlength="1" #keyup="inputHandler">
<input type="text" maxlength="1" #keyup="inputHandler">
<input type="text" maxlength="1" #keyup="inputHandler">
<input type="text" maxlength="1" #keyup="inputHandler">
</div>
Related
How to properly track keys with DOM
I'm doing a web calculator, I need to track when when the user type a number key, but this calculator also has two input type="number" to define the range that the numbers will be generated.
let from = document.querySelector("#from")
let to = document.querySelector("#to")
let regex = /[\d]/
from.addEventListener("focus", () => {
console.log('focus')
});
document.onkeypress = function(evt) {
if (evt.key.match(regex)) {
alert(evt.key);
} else if (evt.key == 'Enter') {
alert(evt.key)
};
};
<div class="range">
<span>Range: from </span>
<input type="number" id="from" value="0">
<span>to</span>
<input type="number" id="to" value="100">
</div>
How I can stop tracking the keys only when the user is typing on the input field?
the solution is to check if document.activeElement is equals to the element that you want to check.
document.onkeypress = function(evt) {
if (from === document.activeElement) {
console.log("jaisokdjhaslkdhjsa")
} else {
if (evt.key.match(regex)) {
alert(evt.key);
} else if (evt.key == 'Enter') {
alert(evt.key)
};
}
};
On keyup is not satisfying the condition
<label> Telugu</label>
<input type="text" onkeyup="return isNumber(event)" name="telugu" id="telugu" maxlength="3"/> <br> <br>
JS
<!DOCTYPE html>
<html>
<head>
<script>
function isNumber(event){
var k= event.keyCode;
console.log(k);
if((k>47 && k<58)) /// THIS IS NOT WORKING
{
console.log("entered");
var s1 = document.getElementById("telugu").value;
var s2= document.getElementById("hindi").value;
var s3= document.getElementById("english").value;
var s4= document.getElementById("maths").value;
var s5= document.getElementById("science").value;
if(s1<0 || s1>100){
console.log("tel")
document.getElementById("telugu").value = 0;
}
I want to input only numbers in a textbox. the condition is not working. If the value in the textbox is less than 0 or greater than 100. then I am resetting the value to 0. Resetting is working but the characters are also entering.
You could use a regex to remove everything that is not a digit. I also change to the input event which fires whenever the input changes.
If you want to force numbers you could also just set the type to type="number". The benefit for this is that it will automatically show the number keyboard on phones and tablets, though you can show this as well with the inputmode="numeric" attribute
// Get the textbox
const telugu = document.getElementById("telugu");
// Add event that fires whenever the input changes
telugu.addEventListener("input", () => {
// Replace everything that is not a digit with nothing
const stripped = telugu.value.replace(/[^\d]/g, "");
// If the value is below 0 or above 100 set it to 0, else enter the stripped value
stripped < 0 || stripped > 100
? telugu.value = 0
: telugu.value = stripped;
});
<label for="telugu">Telugu</label>
<input type="text" name="telugu" id="telugu" maxlength="3"/>
Without comments:
const telugu = document.getElementById("telugu");
telugu.addEventListener("input", () => {
const stripped = telugu.value.replace(/[^\d]/g, "");
stripped < 0 || stripped > 100
? telugu.value = 0
: telugu.value = stripped;
});
<label for="telugu">Telugu</label>
<input type="text" name="telugu" id="telugu" maxlength="3"/>
Simplified:
function validateValue(event) {
var input = event.target;
var stripped = input.value.replace(/[^0-9]/g, ""); /* Everthing that is not (^) in the range of 0 through 9 */
if(stripped < 0 || stripped > 100) {
input.value = 0;
} else {
input.value = stripped;
}
}
<label for="telugu">Telugu</label>
<input type="text" oninput="validateValue(event)" name="telugu" id="telugu" maxlength="3"/>
You should do s1 variable parsed integer with parseInt() function.
function isNumber(event){
var k = event.keyCode;
console.log(k);
if(k>47 && k<58){
console.log("entered");
var s1 = parseInt(document.getElementById("telugu").value);
console.log('s1', s1);
if(s1<0 || s1>100){
console.log("tel")
document.getElementById("telugu").value = 0;
}
}else{
document.getElementById("telugu").value = null;
}
}
<label> Telugu</label>
<input type="text" onkeyup="return isNumber(event)" name="telugu" id="telugu" maxlength="3"/>
There are different ways to to this.
input: Fires when the value of the input has changed.
change: Fires when the value of the input has changed and the element loses its focus (it is no more selected).
blur: Fires when the input losed its focus.
Which event you use, depend on when you want to check the input. Use input if you want to check it instantly after the change of the value. Otherwise use blur or change.
Example:
let input = document.querySelector('#telegu');
input.addEventListener('input', () => {
// Your check
});
input.addEventListener('change', () => {
// Your check
});
input.addEventListener('blur', () => {
// Your check
});
navigation in multiple inputs when reaching max length
I am basically trying to have these three text inputs representing 00h 00m 00s for my timer to get user input. I wanted to be able to make google timer (the one you can see if you just type timer in google) but I got stuck with getting navigation right - when user put two digits then focus into next input and when there is no "form" element break out of the loop. However, I keeping getting "Cannot read property 'firstElementChild' of null".
Also, what I hope to see is when user type the number (ex. 01 : 30: 00) and then hit enter I want to be able to get the user value so then I can work on building timer based on the user input however, the keypress event for listening "Enter" key to fire a submit doesn't seem to work and e.preventDefault() doesn't work either..
<div class="form-container">
<form class="1" action="">
<input class="1" type="text" maxlength="2" placeholder="00:">
</form>
<form class="2" action="">
<input class="2" type="text" maxlength="2" placeholder="00:">
</form>
<form class="3" action="">
<input class="3" type="text" maxlength="2" placeholder="00:">
</form>
</div>
formContainer.addEventListener('keyup', function(e){
let target = e.srcElement || e.target;
let targetValue = target.attributes["maxlength"].value
let maxLength = parseInt(targetValue, 10);
let currentLength = target.value.length;
if(currentLength >= maxLength) {
let next = target;
let nextInputParent = target.parentElement.nextElementSibling
let nextInputInNextSibling = nextInputParent.firstElementChild
while (next = nextInputInNextSibling){
if (next.parentElement == null){
break;
}
if (next.tagName.toLowerCase() === "input") {
next.focus();
break;
}
}
}
// Move to previous field if empty (user pressed backspace)
else if (currentLength === 0) {
let previous = target;
let previousInputInPreviousSibling = target.parentElement.previousElementSibling.children[0]
while (previous = previousInputInPreviousSibling) {
if (previous == null)
break;
if (previous.tagName.toLowerCase() === "input") {
previous.focus();
break;
}
}
}
})
form.addEventListener('keydown', function(e){
if(e.key == "Enter" || e.keyCode == 13){
console.log("submit");
e.preventDefault()
form.submit()
let userInput = inputEl.value
let countdown = 60 * userInput
timer = new Timer(countdown, userInput)
timer.start()
toggleStartTimer.textContent = "stop"
timer.isOn = true
}
})
Why using three separate forms for each input element? You can use one form, with an oninput event handler for each input element. Basically, an oninput event fires whenever the user presses a key/writes anything inside the input.
Then, you can use the form's onsubmit handler to handle hitting Enter, like so:
//event handler that will fire whenever the user types something in one of the inputs
$("#timer input[type='text']").on("input", function() {
//inside the event handler, `this` refers to the input element that fired the event
if(this.value.length == 2) {
//move to the next input, if any
if(next = $(this).next("#timer input[type='text']")[0]) {
$(this).blur(); //lose focus from the element
next.focus();
}
}
});
//handling case when user presses 'Enter'
//(note that using this approach, one of the inputs should be in focus when Enter is hit)
$("#timer").on("submit", function(e) {
//here e is your event object
e.preventDefault();
//build your timer and start it
console.log("Timer started!");
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="form-container">
<form id="timer" action="">
<input class="1" type="text" maxlength="2" placeholder="00:">
<input class="2" type="text" maxlength="2" placeholder="00:">
<input class="3" type="text" maxlength="2" placeholder="00:">
<!-- An input type='submit' is needed, otherwise the form will never submit when Enter is hit.-->
<input type='submit' value='submit' style='display:none'/>
</form>
</div>
Or, using plain Javascript:
//event handler that will fire whenever the user types something in one of the inputs
var inputs = document.querySelectorAll('#timer input[type="text"]');
for(let input of inputs) {
input.oninput = function() {
if(this.value.length == 2) {
//move to the next input, if any
next = this.nextElementSibling;
if(next && next.type == 'text') {
this.blur(); //lose focus from the element
next.focus();
}
}
}
}
//handling case when user presses 'Enter'
//(note that using this approach, one of the inputs should be in focus when Enter is hit)
$("#timer").on("submit", function(e) {
//here e is your event object
e.preventDefault();
//build your timer and start it
console.log("Timer started!");
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="form-container">
<form id="timer" action="">
<input class="1" type="text" maxlength="2" placeholder="00:">
<input class="2" type="text" maxlength="2" placeholder="00:">
<input class="3" type="text" maxlength="2" placeholder="00:">
<!-- An input type='submit' is needed, otherwise the form will never submit when Enter is hit.-->
<input type='submit' value='submit' style='display:none'/>
</form>
</div>
I think the better way is rely on some max constrains, not the input length. I've created a simple snippet for you. There are 3 inputs and a timer which starts when you hit "Enter".
const form = document.querySelector(".timer");
const time = document.querySelector(".time");
const limits = {
hours: 23,
minutes: 59,
seconds: 59
};
const multipliers = {
hours: val => (parseInt(val, 10) || 0) * 60 * 60,
minutes: val => (parseInt(val, 10) || 0) * 60,
seconds: val => parseInt(val, 10) || 0
};
let interval = null;
let totalTime = 0;
form.addEventListener("keyup", function(event) {
if (event.keyCode === 13) {
totalTime = Array.from(form.querySelectorAll("input")).reduce(function(
sum,
input
) {
const { name, value } = input;
return (sum += multipliers[name](value));
},
0);
if (totalTime > 0) {
if (interval) {
clearInterval(interval);
}
interval = setInterval(() => {
totalTime--;
time.innerHTML = totalTime;
}, 1000);
}
}
const { name, value } = event.target;
const parsedValue = parseInt(value, 10);
const newValue = Math.min(limits[name], parsedValue);
if (parsedValue > newValue) {
const sibling = event.target.nextElementSibling;
if (sibling && "focus" in sibling) {
sibling.focus();
}
event.target.value = newValue;
}
});
<form class="timer">
<input name="hours" placeholder="00"/>
<input name="minutes" placeholder="00"/>
<input name="seconds" placeholder="00"/>
</form>
<h1 class="time"></h1>
Temporarily disable an input field if second input field is filled
I'm attempting to disable an input while the user is filling another input. I've managed to disable one of the two inputs while the other input is being filled in.
The problem is that I want the disabled input to ONLY be disabled WHILE the other input is being typed in.
So if the user changes their mind on the 1st input, they can delete what is in the current input which makes the 2nd input available and the 1st disabled.
JS
var inp1 = document.getElementById("input1");
inp1.onchange = function () {
if (this.value != "" || this.value.length > 0) {
document.getElementById("input2").disabled = true;
}
}
HTML
<input type="text" id="input1">
<input type="text" id="input2">
First, I would use input rather than change. Then, you need to set disabled back to false if the input is blank. Your check for whether it's blank is redundant, you just neither either side of your ||, not both. (I'd also use addEventListener rather than assigning to an .onxyz property, so that it plays nicely with others. :-) )
So:
var inp1 = document.getElementById("input1");
inp1.addEventListener("input", function () {
document.getElementById("input2").disabled = this.value != "";
});
<input type="text" id="input1">
<input type="text" id="input2">
...and then of course if you want it to be mutual, the same for input2.
You can achieve this using focus and blur. Below it is done with JQuery.
$(function() {
$('#input1').focus(function(){
$('#input2').prop('disabled', 'disabled');
}).blur(function(){
$('#input2').prop('disabled', '');
});
$('#input2').focus(function(){
$('#input1').prop('disabled', 'disabled');
}).blur(function(){
$('#input1').prop('disabled', '');
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" id="input1">
<input type="text" id="input2">
How about using keyup?
Like this;
var inp1 = document.getElementById("input1");
var inp2 = document.getElementById("input2");
inp1.onkeyup = function() { inputValidation(this, inp2); }
inp2.onkeyup = function() { inputValidation(this, inp1); }
function inputValidation(origin, lock) {
var response = hasValue(origin.value);
lock.disabled = response;
}
function hasValue(value) {
return value != "" && value.length > 0;
}
https://jsfiddle.net/8o3wwp6s/
Don't make it harder than it is, this is simple.
var one = document.getElementById('one');
var two = document.getElementById('two');
//checks instantly
var checker = setInterval(function() {
if(two.value !== '') {
one.disabled = true;
} else {
//when its clear, it enabled again
one.disabled = false;
}
if(one.value !== '') {
two.disabled = true
} else {
two.disabled = false;
}
}, 30);
<input id="one">
<input id="two">
Focus next input once reaching maxlength value
How can I focus the next input once the previous input has reached its maxlength value? a: <input type="text" maxlength="5" /> b: <input type="text" maxlength="5" /> c: <input type="text" maxlength="5" /> If a user pastes text that is greater than the maxlength, ideally it should spill into the next input. jsFiddle: http://jsfiddle.net/4m5fg/1/ I must stress that I do not want to use a plugin, as I'd much rather learn the logic behind this, than use something that already exists. Thanks for understanding.
No jQuery used and is a very clean implementation:
Reads from the maxlength attribute.
Scales to any number of inputs inside of your container.
Automatically finds the next input to focus.
No jQuery.
http://jsfiddle.net/4m5fg/5/
<div class="container">
a: <input type="text" maxlength="5" />
b: <input type="text" maxlength="5" />
c: <input type="text" maxlength="5" />
</div>
..
var container = document.getElementsByClassName("container")[0];
container.onkeyup = function(e) {
var target = e.srcElement || e.target;
var maxLength = parseInt(target.attributes["maxlength"].value, 10);
var myLength = target.value.length;
if (myLength >= maxLength) {
var next = target;
while (next = next.nextElementSibling) {
if (next == null)
break;
if (next.tagName.toLowerCase() === "input") {
next.focus();
break;
}
}
}
// Move to previous field if empty (user pressed backspace)
else if (myLength === 0) {
var previous = target;
while (previous = previous.previousElementSibling) {
if (previous == null)
break;
if (previous.tagName.toLowerCase() === "input") {
previous.focus();
break;
}
}
}
}
You can watch for input in the fields and test its value:
$("input").bind("input", function() {
var $this = $(this);
setTimeout(function() {
if ( $this.val().length >= parseInt($this.attr("maxlength"),10) )
$this.next("input").focus();
},0);
});
Working demo.
The setTimeout is there to ensure the code will only run after the input is completed and the value updated. Binding input ensures most types of input will trigger the event, including key presses, copy/paste (even from mouse) and drag & drop (though in this case, the latter won't work, since the focus was on the draggable, not the droppable).
Note: on some older browsers, you might also need to bind propertychange.
If a user pastes text that is greater than the maxlength, ideally it should spill into the next input.
To do that, you might need to remove the maxlength attribute using JavaScript (to be able to capture the full input), and implement that functionality yourself. I made a small example, relevant parts below:
$("input").each(function() {
var $this = $(this);
$(this).data("maxlength", $this.prop("maxlength"));
$(this).removeAttr("maxlength");
})
This removes the attribute, but saves it in data, so you can access it later.
function spill($this, val) {
var maxlength = $this.data("maxlength");
if ( val.length >= maxlength ) {
$this.val(val.substring(0, maxlength));
var next = $this.next("input").focus();
spill(next, val.substring(maxlength));
}
else
$this.val(val);
}
Here the max length logic is reintroduced in JavaScript, as well as getting the "discarded" part and using it in a recursive call to spill. If there's no next element, the call to data will return undefined and the loop will stop, so the input will be truncated in the last field.
You can use plain JavaScript:
See DEMO.
Check the character length with el.value.length. If it is equal to the maximum value, move to the next field by using focus(). Bind this function to the keyup event with onkeyup so that the function fires every time after the user keys in a character.
var a = document.getElementById("a"),
b = document.getElementById("b"),
c = document.getElementById("c");
a.onkeyup = function() {
if (this.value.length === parseInt(this.attributes["maxlength"].value)) {
b.focus();
}
}
b.onkeyup = function() {
if (this.value.length === parseInt(this.attributes["maxlength"].value)) {
c.focus();
}
}
if you are going to have many fields you can do something like this.
basically on keyup get the length of the input and then compare it to the maxlength, if matches, then focus onto the next input field.
http://jsfiddle.net/btevfik/DVxDA/
$(document).ready(function(){
$('input').keyup(function(){
if(this.value.length==$(this).attr("maxlength")){
$(this).next().focus();
}
});
});
let otp = document.querySelector('#otp-screen');
for(let pin of otp.children) {
pin.onkeyup = function() {
if(pin.nextElementSibling) {
pin.nextElementSibling.focus();
}
}
}
<div class="otp-screen" id="otp-screen">
<input type="text" placeholder="0" maxlength="1"/>
<input type="text" placeholder="0" maxlength="1"/>
<input type="text" placeholder="0" maxlength="1"/>
<input type="text" placeholder="0" maxlength="1"/>
</div>
Updated btevfik code, Onkeyup or onkeydown will create issue as you won't be able to delete the previous input on tab navigation. It will be tough to edit or change the text inside the input box as it will be limited to maxlength. So we can use oninput event to achieve the task.
DEMO
HTML
<ul>
<li>a: <input type="text" maxlength="5" /></li>
<li>b: <input type="text" maxlength="3" /></li>
<li>c: <input type="text" maxlength="5" /></li>
<li>d: <input type="text" maxlength="3" /></li>
<li>e: <input type="text" maxlength="6" /></li>
<li>f: <input type="text" maxlength="10" /></li>
<li>g: <input type="text" maxlength="7" /></li>
</ul>
Javascript
$(document).ready(function(){
$('input').on("input", function(){
if($(this).val().length==$(this).attr("maxlength")){
$(this).next().focus();
}
});
});
CSS
ul {list-style-type:none;}
li {padding:5px 5px;}
Other answers do give some idea how this can be implemented, but I find that they do not consider some minor things among which are:
The fact, that you do not want to auto-focus any elements across whole page, but rather within specific form.
Input elements can be wrapped in some other elements (for example I wrap them in span or div to allow floating labels through CSS, and I've seen forms that use table to for structure).
Validity of the field, when spilling over or moving to next one automatically.
Input events when spilling over.
Cursor position when returning to previous field (it looks like it can be saved by browser, thus backspacing can focus not in the end of the field, but, for example, in the middle).
Below code is trying to account to all of this, at least. Most of it can be tested on codepen: paste-spilling does not work there, looks like because of Clipboard API (other codepens with it do not work for me either).
Let me know if anything is unclear in the code, I'll update my answer and the code. If you find some edge case that is not covered - let me know as well.
For paste-spilling test using form from codepen, you can use something like this: 123456789123456789012345678903454353434534
Video sample of how it works in a more "live" envitonment on youtube
//List of input types, that are "textual" by default, thus can be tracked through keypress and paste events. In essence,
// these are types, that support maxlength attribute
const textInputTypes = ['email', 'password', 'search', 'tel', 'text', 'url', ];
formInit();
//Add listeners
function formInit()
{
document.querySelectorAll('form input').forEach((item)=>{
if (textInputTypes.includes(item.type)) {
//Somehow backspace can be tracked only on keydown, not keypress
item.addEventListener('keydown', inputBackSpace);
if (item.getAttribute('maxlength')) {
item.addEventListener('input', autoNext);
item.addEventListener('change', autoNext);
item.addEventListener('paste', pasteSplit);
}
}
});
}
//Track backspace and focus previous input field, if input is empty, when it's pressed
function inputBackSpace(event)
{
let current = event.target;
if ((event.keyCode || event.charCode || 0) === 8 && !current.value) {
let moveTo = nextInput(current, true);
if (moveTo) {
moveTo.focus();
//Ensure, that cursor ends up at the end of the previous field
moveTo.selectionStart = moveTo.selectionEnd = moveTo.value.length;
}
}
}
//Focus next field, if current is filled to the brim and valid
function autoNext(event)
{
let current = event.target;
//Get length attribute
let maxLength = parseInt(current.getAttribute('maxlength'));
//Check it against value length
if (maxLength && current.value.length === maxLength && current.validity.valid) {
let moveTo = nextInput(current, false);
if (moveTo) {
moveTo.focus();
}
}
}
async function pasteSplit(event)
{
let permission = await navigator.permissions.query({ name: 'clipboard-read',});
//Check permission is granted or not
if (permission.state === 'denied') {
//It's explicitly denied, thus cancelling action
return false;
}
//Get buffer
navigator.clipboard.readText().then(result => {
let buffer = result.toString();
//Get initial element
let current = event.target;
//Get initial length attribute
let maxLength = parseInt(current.getAttribute('maxlength'));
//Loop while the buffer is too large
while (current && maxLength && buffer.length > maxLength) {
//Ensure input value is updated
current.value = buffer.substring(0, maxLength);
//Trigger input event to bubble any bound events
current.dispatchEvent(new Event('input', {
bubbles: true,
cancelable: true,
}));
//Do not spill over if a field is invalid
if (!current.validity.valid) {
return false;
}
//Update buffer value (not the buffer itself)
buffer = buffer.substring(maxLength);
//Get next node
current = nextInput(current);
if (current) {
//Focus to provide visual identification of a switch
current.focus();
//Update maxLength
maxLength = parseInt(current.getAttribute('maxlength'));
}
}
//Check if we still have a valid node
if (current) {
//Dump everything we can from leftovers
current.value = buffer;
//Trigger input event to bubble any bound events
current.dispatchEvent(new Event('input', {
bubbles: true,
cancelable: true,
}));
}
}).catch(err => {
//Most likely user denied request. Check status
navigator.permissions.query({ name: 'clipboard-read',}).then(newPerm => {
if (newPerm.state === 'granted') {
console.log('Failed to read clipboard', err);
} else {
console.log('Request denied by user. Show him some notification to explain why enabling permission may be useful');
}
}).catch(errPerm => {
console.log('Failed to read clipboard', errPerm);
});
});
}
//Find next/previous input
function nextInput(initial, reverse = false)
{
//Get form
let form = initial.form;
//Iterate inputs inside the form. Not using previousElementSibling, because next/previous input may not be a sibling on the same level
if (form) {
let previous;
for (let moveTo of form.querySelectorAll('input')) {
if (reverse) {
//Check if current element in loop is the initial one, meaning
if (moveTo === initial) {
//If previous is not empty - share it. Otherwise - false, since initial input is first in the form
if (previous) {
return previous;
} else {
return false;
}
}
} else {
//If we are moving forward and initial node is the previous one
if (previous === initial) {
return moveTo;
}
}
//Update previous input
previous = moveTo;
}
}
return false;
}
If you are adding input text fields dynamically then you can try this.
This will re-inject the script into the DOM and works Perfectly.
$('body').on('keyup', '#num_1',function(){
if (this.value.length === parseInt(this.attributes["maxlength"].value)) {
$('#num_2').focus();
}
})
$('body').on('keyup','#num_2', function(){
if (this.value.length === parseInt(this.attributes["maxlength"].value)) {
$('#num_3').focus();
}
})
<input type="text" class="form-control" name="number" maxlength="3" id="num_1">
<input type="text" class="form-control" name="number" maxlength="3" id="num_2">
<input type="text" class="form-control" name="number" maxlength="4" id="num_3">
If you're focused on creating card(debit/credit) number input type. Then clean an easily manageable jQuery version as follows:
/*..............................................................................................
* jQuery function for Credit card number input group
......................................................................................................*/
// make container label of input groups, responsible
$('.card-box').on('focus', function(e){
$(this).parent().addClass('focus-form-control');
});
$('.card-box').on('blur', function(e){
$(this).parent().removeClass('focus-form-control');
});
$('.card-box-1').on('keyup', function(e){
e.preventDefault();
var max_length = parseInt($(this).attr('maxLength'));
var _length = parseInt($(this).val().length);
if(_length >= max_length) {
$('.card-box-2').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
if(_length <= 0){
return;
}
});
$('.card-box-2').on('keyup', function(e){
e.preventDefault();
var max_length = parseInt($(this).attr('maxLength'));
var _length = parseInt($(this).val().length);
if(_length >= max_length) {
$('.card-box-3').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
if(_length <= 0){
$('.card-box-1').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
});
$('.card-box-3').on('keyup', function(e){
e.preventDefault();
var max_length = parseInt($(this).attr('maxLength'));
var _length = parseInt($(this).val().length);
if(_length >= max_length) {
$('.card-box-4').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
if(_length <= 0){
$('.card-box-2').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
});
$('.card-box-4').on('keyup', function(e){
e.preventDefault();
var max_length = parseInt($(this).attr('maxLength'));
var _length = parseInt($(this).val().length);
if(_length >= max_length) {
return;
}
if(_length <= 0){
$('.card-box-3').focus().removeAttr('readonly');
$(this).attr('readonly', 'readonly');
}
});
/*..............................................................................................
* End jQuery function for Credit card number input group
......................................................................................................*/
/* Hide HTML5 Up and Down arrows. */
input[type="number"]::-webkit-outer-spin-button, input[type="number"]::-webkit-inner-spin-button {
-webkit-appearance: none; margin: 0;
}
input[type="number"] { -moz-appearance: textfield; }
.card-box {
width: 20%; display: inline-block; height: 100%; border: none;
}
.focus-form-control {
border-color: #66afe9; outline: 0;-webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, .6);
box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(102, 175, 233, .6);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div class="form-control" style="padding: 0; max-width: 300px; ">
<input class="card-box card-box-1" type="number" id="CreditCard_CardNumber1" required step="1" minlength="4" maxlength="4" pattern="[0-9]{4}" value="" placeholder="0000"
onClick="this.setSelectionRange(0, this.value.length)" oninput="this.value=this.value.slice(0,this.maxLength||'');this.value=(this.value < 1) ? ('') : this.value;"/>
<input class="card-box card-box-2" type="number" id="CreditCard_CardNumber2" readonly required step="1" minlength="4" maxlength="4" pattern="[0-9]{4}" value="" placeholder="0000"
onClick="this.setSelectionRange(0, this.value.length)" oninput="this.value=this.value.slice(0,this.maxLength||'');this.value=(this.value < 1) ? ('') : this.value;" />
<input class="card-box card-box-3" type="number" id="CreditCard_CardNumber3" readonly required step="1" minlength="4" maxlength="4" pattern="[0-9]{4}" value="" placeholder="0000"
onClick="this.setSelectionRange(0, this.value.length)" oninput="this.value=this.value.slice(0,this.maxLength||'');this.value=(this.value < 1) ? ('') : this.value;" />
<input class="card-box card-box-4" type="number" id="CreditCard_CardNumber4" readonly required step="1" minlength="4" maxlength="4" pattern="[0-9]{4}" value="" placeholder="0000"
onClick="this.setSelectionRange(0, this.value.length)" oninput="this.value=this.value.slice(0,this.maxLength||'');this.value=(this.value < 1) ? ('') : this.value;" />
</div>
Verified Answer have one issue which focus previous field if previous field have valid length
I have Modified Above Answer to fix complete length of previous tag
var container = document.getElementsByClassName("container")[0];
container.onkeyup = function(e) {
var target = e.srcElement || e.target;
var maxLength = parseInt(target.attributes["maxlength"].value, 10);
var myLength = target.value.length;
if (myLength >= maxLength) {
var next = target;
while (next = next.nextElementSibling) {
if (next == null)
break;
if (next.tagName.toLowerCase() === "input") {
next.focus();
break;
}
}
}
// Move to previous field if empty (user pressed backspace)
else if (myLength === 0) {
var previous = target;
// Move to previous field if backspace is pressed
if (code == 8) {
previous = previous.previousElementSibling;
if (previous != null) {
if (previous.tagName.toLowerCase() === "input") {
previous.focus();
}
}
} else {
while (previous = previous.previousElementSibling) {
if (previous == null)
break;
if (previous.tagName.toLowerCase() === "input") {
var mLength = parseInt(previous.attributes["maxlength"].value, 10);
var pMyLength = previous.value.length;
// Move to previous field if it does not have required length
if (mLength == pMyLength) {
break;
} else {
previous.focus();
break;
}
}
}
}
}
}
I think this is a shorter way. As long as you use a specific structure in HTML
const inputHandler = (event) => {
if (event.target.nodeName == "INPUT" && event.target.nextElementSibling != null) {
event.target.nextElementSibling.focus();
}
}
<div class="enter-code">
<input type="text" maxlength="1" #keyup="inputHandler">
<input type="text" maxlength="1" #keyup="inputHandler">
<input type="text" maxlength="1" #keyup="inputHandler">
<input type="text" maxlength="1" #keyup="inputHandler">
</div>