I have 2 text inputs on a Form:
<div class="form-group">
<input type="text" class="form" id="descriptionInput" placeholder="Customer Name" onkeyup="manage(this)">
</div>
<div class="form">
<input type="text" class="form" id="contactName" placeholder="Contact Name">
</div>
The idea is to enable the submit button only if these 2 fields have any value:
My button:
<button type="submit" id="btSubmit" disabled>Add new Customer Entry</button>
My enable/disable function:
function manage(descriptionInput, contactName) {
var bt = document.getElementById('btSubmit');
var custName = document.getElementById('descriptionInput').value.length;
var contact = document.getElementById('contactName').value.length;
if (custName > 0 && contact > 0) {
bt.disabled = false;
}
else {
bt.disabled = true;
}
}
Issue is:
if customer name field has 1 character only + contact has 1 or more characters = doesn't work
if customer name field has 2 characters + contact has 1 or more characters = it works
Not sure what's happening, any ideas?
Thanks
The problem is that the manage function is only called when a key up event is triggered on the #descriptionInput <input>.
To fix that, monitor both inputs for changes, here is an example:
const btSubmit = document.querySelector('#btSubmit');
const descriptionInput = document.querySelector('#descriptionInput');
const contactName = document.querySelector('#contactName');
function manage() {
btSubmit.disabled = descriptionInput.value.length === 0 || contactName.value.length === 0;
}
descriptionInput.addEventListener('input', manage);
contactName.addEventListener('input', manage);
<div class="form-group">
<input type="text" class="form" id="descriptionInput" placeholder="Customer Name">
</div>
<div class="form">
<input type="text" class="form" id="contactName" placeholder="Contact Name">
</div>
<button type="submit" id="btSubmit" disabled>Add new Customer Entry</button>
Here, instead of listening for key up events, I'm listening for input events, this is more appropriate because this event is also triggered when you paste something in an input for example.
Also, instead of adding the event listeners inline, I'm adding them in JavaScript.
You forgot to add the keyup event on the second input.
Related
I have to do the validation of the input text field.
I would like Js to show an error message through the setCustomValidity() method.
Is it possible?
function checkName() {
var x = document.formUser;
var input = x.name.value;
if (input.length < 3) {
input.setCustomValidity('This field is invalidate');
return false;
}
}
<form name="formUser" id="formUser" action="#" method="POST" onsubmit="return validateForm();">
<div class="section">
<label for="fname">Nome</label>
<input class="form-control" type="text" id="name" required>
</div>
<input type="submit" class="btn btn-primary" value="Invia" onclick="validateForm();">
</form>
You need to call reportValidity() on the input after setting the custom validity message.
Additionally you must call the reportValidity method on the same element or nothing will happen.
https://developer.mozilla.org/en-US/docs/Web/API/HTMLObjectElement/setCustomValidity#examples
function checkName() {
const inp = document.getElementById('name');
const val = inp.value;
if (val.length < 3) {
inp.setCustomValidity('This field is invalidate');
inp.reportValidity();
return false;
}
}
<form name="formUser" id="formUser" action="#" method="POST" onsubmit="return checkName();">
<div class="section">
<label for="fname">Nome</label>
<input class="form-control" type="text" id="name" required>
</div>
<input type="submit" class="btn btn-primary" value="Invia" onclick="checkName();">
</form>
I would like to control more text input with javascript.
The setCustomValidity() method means that it will have to show an error message if input has less than three characters.
it doesn't always work.
Eg. If I put a string of one character in the first field and a string of four in the second field; it sends without showing the error. If I repeat the same test, it works.
Why?
window.onload = function() {
const field = document.getElementsByClassName("input-field");
for (let i = 0; i < field.length; i++) {
field[i].addEventListener('input', function() {
const val = field[i];
if (val.length < 3) {
field[i].setCustomValidity('Field is invalid');
}
})
}
}
<form name="formUser" id="formUser" action="#">
<div class="section">
<label for="fname">First name</label>
<input class="form-control input-field" type="text" id="fname" required>
<label for="lname">Last name</label>
<input class="form-control input-field" type="text" id="lname" required>
</div>
<input type="submit" class="btn btn-primary" value="Send">
You could add a <p class="error">...</p> inside your section div.
Hide it with css (display: none) and when you get an error in your validation add a class to that like "show" to show it (display: unset).
You can do custom form validation using Javascript like this.
Here I have just added a div with a warning and alert box. You can do whatever you want.
It will alert a warning if you will click on submit when fields were empty.
<!DOCTYPE html>
<html>
<head>
<script>
function validateForm() {
let x = document.forms["myForm"]["fname"].value;
let alertBox = document.getElementById("alert-box");
// Here instead of checking (x == " "), you can use your custom validations
if (x == "") {
alertBox.innerHTML = `<p>Form input are empty</p>`; // appends a div with warning
alert("Name must be filled out"); // alert box
return false;
}
}
</script>
</head>
<body>
<h2>JavaScript Validation</h2>
<div id="alert-box"> </div>
<form name="myForm" action="#" onsubmit="return validateForm()" method="post">
Name: <input type="text" name="fname">
<input type="submit" value="Submit">
</form>
</body>
</html>
So I was wondering how I could implement required fields into my code. I tried just using required="" in the <input> tag, however, this doesn't work across all browsers. I was wondering if someone could explain how to add "* Required" next to the input if the user tries to submit and the field is empty.
Here's my form code:
contact.html
<form class="contact_form" name="Form" onsubmit="return validateForm()" action="contactform.php" method="post">
<label>Name *</label><br/>
<input type="text" name="name" id="noName" placeholder="Full Name"><br/>
<label>Email *</label><br/>
<input type="text" name="email" id="a" placeholder="Email"><br/>
<label>Subject *</label><br/>
<input type="text" name="subject" id="b" placeholder="Subject"><br/>
<label>Message *</label><br/>
<textarea type="text" name="message" id="c" placeholder="Message"></textarea>
<button type="submit" name="submit" class="submit">Submit</button>
</form>
formvalidate.js
function validateForm()
{
var a=document.forms["Form"]["email"].value;
var b=document.forms["Form"]["subject"].value;
var c=document.forms["Form"]["message"].value;
if (a==null || a=="",b==null || b=="",c==null || c=="")
{
alert("Please Fill All Required Field");
return false;
}
}
var input = document.getElementById('a');
if(input.value.length == 0)
input.value = "Anonymous";
First of all this is wrong:
if (a==null || a=="",b==null || b=="",c==null || c=="")
Presumably you lifted that from here and as noted in the comments, it doesn't do what it claims and will only check the last field.
To add the message you can modify your validation function to check each field and insert some text. The snippet below should give you a basic idea - and since you're new to javascript I've commented each bit with an explanation. Hope this helps:
function validateForm() {
// start fresh, remove all existing warnings
var warnings = document.getElementsByClassName('warning');
while (warnings[0]) {
warnings[0].parentNode.removeChild(warnings[0]);
}
// form is considered valid until we find something wrong
var has_empty_field = false;
// an array of required fields we want to check
var fields = ['email', 'subject', 'message'];
var c = fields.length;
// iterate over each field
for (var i = 0; i < c; i++) {
// check if field value is an empty string
if (document.forms["Form"][fields[i]].value == '') {
// create a div with a 'warning' message and insert it after the field
var inputField = document.forms["Form"][fields[i]];
var newNode = document.createElement('div');
newNode.style = "color:red; margin-bottom: 2px";
newNode.className = "warning";
newNode.innerHTML = fields[i] + ' is required!';
inputField.parentNode.insertBefore(newNode, inputField.nextSibling);
// form is now invalid
has_empty_field = true;
}
}
// do the alert since form is invalid - you might be able to skip this now
if (has_empty_field) {
alert("Please Fill All Required Field");
return false;
}
}
<form class="contact_form" name="Form" onsubmit="return validateForm()" action="contactform.php" method="post">
<label>Name *</label><br/>
<input type="text" name="name" id="noName" placeholder="Full Name"><br/>
<label>Email *</label><br/>
<input type="text" name="email" id="a" placeholder="Email"><br/>
<label>Subject *</label><br/>
<input type="text" name="subject" id="b" placeholder="Subject"><br/>
<label>Message *</label><br/>
<textarea type="text" name="message" id="c" placeholder="Message"></textarea>
<button type="submit" name="submit" class="submit">Submit</button>
</form>
And of course you always need server side validation as well! Client side is really only to help get a snappy UIX and can be easily fail or becircumvented by any user who has a mind to do so. Any data you send to the server needs to be checked over and if something's wrong an error should be returned and handled properly on the form page.
The input field becomes a required field when you specify inside the field that it is a required field. Just placing an asterisk * or placing the word required next to it will not make it required.
Here is how to make an input field required in HTML5
Username *: <input type="text" name="usrname" required>
It is the attribute "required" of the element itself that makes it required.
Secondly.. when using the HTML5 validation you will not need javascript validation because the form will not pass the html5 validation. Having both client-side and server-side is important.
Would like your help resolving this piece of code.
Trying to clear inputs after submit but not able to.
Can someone give me a hint??
Thank you so much.
<script>
var list = document;
function process(idTable)
{
var newRow = list.createElement('tr');
newRow.insertCell(0).innerHTML = list.getElementsByName('name')[0].value;
newRow.insertCell(1).innerHTML = list.getElementsByName('surname')[0].value;
newRow.insertCell(2).innerHTML = list.getElementsByName('email')[0].value;
list.getElementById(idTable).appendChild(newRow);
return false;
list.getElemntsByName('form')[0].value="";
}
</script>
<section>
<form name="form" method="post" id="myForm" onsubmit=" return process('myTable')" >
<p> <label>Name:</label> <input type="text" name="name" placeholder = "Your first name" required> </p>
<p> <label>Surname:</label> <input type="text" name="surname" placeholder = "Your last name" required> </p>
<p> <label>Email:</label> <input type="e-mail" name="email" placeholder = "xpto#example.com" required> </p>
<p> <input type="submit" value="Add"> <input type="reset" value="Reset"> </p>
</form>
</section>
Two points:
You exited the function before assign value to the form
Better use list.getElemntsByName('form')[0].reset();
So your code will be like this:
<script>
var list = document;
function process(idTable)
{
var newRow = list.createElement('tr');
newRow.insertCell(0).innerHTML = list.getElementsByName('name')[0].value;
newRow.insertCell(1).innerHTML = list.getElementsByName('surname')[0].value;
newRow.insertCell(2).innerHTML = list.getElementsByName('email')[0].value;
list.getElementById(idTable).appendChild(newRow);
list.getElemntsByName('form')[0].reset();
return false;
}
</script>
Why don't you use button tag for your 'submit' and 'reset', then in that use clientclick event, have reset function that clears the input tag.
Use $('#id of input element ').val(' ') inside process function . Also write this code above return false statement
I am using javascript to adding two textbox values and store that value in same textbox. For that process am using onmouseenter event. When i enter mouse in that textbox that textbox values increasing each time but i need to avoid it. Here i posted my code can you please solve it,
function removeFormField() {
var count_id = document.getElementById("balance").value;
document.getElementById('balance').value = parseInt(count_id)+10;
}
HTML Code:
<div class="form-group">
<label for="firstname" class="col-sm-4 control-label">Balance amount</label>
<div class="col-sm-6">
<input type="text" class="form-control" id="balance" name="balance" placeholder="Balance amount" onmouseenter="removeFormField();">
</div>
</div>
Use a flag to keep track of change
var allowChange = true;
function removeFormField() {
if(allowChange){
var count_id = document.getElementById("balance").value;
document.getElementById('balance').value = parseInt(count_id)+10;
allowChange = false;
}
}
<input type="text" class="form-control" id="balance" name="balance" placeholder="Balance amount" onkeypress="removeFormField()">
Only one change made on the input event. Changed to keypress and it is only called when you enter and input to field. and not when you click your mouse on to the field.
I have a single form on the page and I have some jQuery to make sure that the inputs have been completed before the submit.
But now I need to have multiple similar forms repeated on the page and I need to change the jQuery to only check the two inputs in the form that the button was clicked and not check any other form on the page.
<div class="offerDate">
<form class="form-inline hidden-phone" action="http://www.treacyswestcounty.com/bookings/" method="get">
<fieldset>
<input type="text" name="from_date" placeholder="dd/mm/yy" id="from_date" class="input-small hasDatepicker">
<input type="text" name="to_date" placeholder="dd/mm/yy" id="to_date" class="input-small hasDatepicker">
<button id="submitDates" class="btn btn-main" type="submit">CHECK NOW</button>
</fieldset>
</form>
</div>
<div class="offerDate">
<form class="form-inline hidden-phone" action="http://www.treacyswestcounty.com/bookings/" method="get">
<fieldset>
<input type="text" name="from_date" placeholder="dd/mm/yy" id="from_date" class="input-small hasDatepicker">
<input type="text" name="to_date" placeholder="dd/mm/yy" id="to_date" class="input-small hasDatepicker">
<button id="submitDates" class="btn btn-main" type="submit">CHECK NOW</button>
</fieldset>
</form>
</div>
The jQuery that I have used previously to check on form using ID
// validate signup form on keyup and submit
jQuery('#submitDates').click(function () {
var found = false;
jQuery("#to_date, #from_date").each(function(i,name){
// Check if field is empty or not
if (!found && jQuery(name).val()=='') {
alert ('Please choose your arrival and departure dates!')
found = true;
} ;
});
return !found;
});
.prev( [selector ] )
Returns: jQuery
Description: Get the immediately preceding sibling of each element in
the set of matched elements, optionally filtered by a selector.
This is quite short and will target any input displayed just before a button :
$("button").prev("input")
jsFiddled here
you can try like this:
CODE
jQuery('.submitDates').click(function () {
var found = false;
jQuery(this).siblings("input").each(function (i, name) {
// Check if field is empty or not
if (!found && jQuery(name).val() == '') {
alert('Please choose your arrival and departure dates!')
found = true;
};
});
return !found;
});
assuming your inputs are siblings for the button. Note I also changed button's id into class.
FIDDLE http://jsfiddle.net/FY9P9/
Closest and Find do it as well, wherever the input are for the button :
HTML:
<form class="form">
<input type="text" class="toDate" />
<input type="text" class="fromDate" />
<div class="button">Click</div>
</form>
<form class="form">
<input type="text" class="toDate" />
<input type="text" class="fromDate" />
<div class="button">Click</div>
</form>
JS:
$(".button").each(function () {
$(this).click(function () {
if (($(this).closest(".form").find(".toDate").val() == "") || ($(this).closest(".form").find(".fromDate").val() == "")) {
alert("Please fill in arrival and departure Date");
}
})
})
http://jsfiddle.net/GuqJF/1/