I have two input boxes, one takes user input and multiplies it with 596 and then displays the result in the second input box while updating a <span> with the check if its PlanA or PlanB
function calculate() {
var ethBox = document.getElementById('eth').value;
var myResult = ethBox * 596;
document.getElementById('usd').value = myResult.toFixed(2);
if(ethBox < 10){
document.getElementById('span').innerHTML ="PlanA";
}else if(ethBox >= 11 && ethBox <=20){
document.getElementById('span').innerHTML ="PlanB";
}
}
it work.
But I also want the user input in the second input box to be divided by 596 and display the result in the first input box, also updating the <span> with the conditional statement at the same time
function reverse() {
var usdBox = document.getElementById('usd').value;
var myResult = usdBox / 596;
document.getElementById('eth').value = myResult.toFixed(2);
}
This code changes the value of the first input box but it doesnt update the <span>
Input Boxes
<input id="eth" onkeyup="calculate();" type="text">
<input id="usd" onkeyup="reverse();" type="text">
The Span
<span id="span"></span>
I also tried using onkeyup and onchange for the first input box, which didn't work
You need to add the following code in reverse function also. Added a common() method to do the task that is common to both methods.
var ethBox = document.getElementById('eth').value;
if(parseInt(ethBox,10) < 10){
document.getElementById('span').innerHTML ="PlanA";
}else if(ethBox >= 11 && ethBox <=20){
document.getElementById('span').innerHTML ="PlanB";
}
<script>
function calculate() {
var ethBox = document.getElementById('eth').value;
var myResult = ethBox * 596;
document.getElementById('usd').value = myResult.toFixed(2);
common();
}
function reverse() {
var usdBox = document.getElementById('usd').value;
var myResult = usdBox / 596;
document.getElementById('eth').value = myResult.toFixed(2);
common();
}
function common() {
var ethBox = document.getElementById('eth').value;
if(parseInt(ethBox,10) < 10){
document.getElementById('span').innerHTML ="PlanA";
}else if(ethBox >= 11 && ethBox <=20){
document.getElementById('span').innerHTML ="PlanB";
}
}
</script>
<input id="eth" onkeyup="calculate();" type="text">
<input id="usd" onkeyup="reverse();" type="text">
<span id="span"></span>
Related
First Name:
<script language = "javascript">
function sizeChange(x){
var len = 3;
if (document.x.value.length > 3 && document.x.value != "")
{len = document.x.value.length
alert(len)}
else {alert(len)}
}
</script>
function sizeChange(x){
var len = 3;
if (document.x.value.length > 3 && document.x.value != "")
{len = document.x.value.length
alert(len)}
else {alert(len)}
}
First Name: <input type="text" name="firstNa" size = "sizeChange("firstNa")">
How could I make this code change the text box size based on user input, and make the default size 3? The function doesn't seem to be called, and it returns a null value when I insert a test warning.
You need to use "oninput" :
var renderNewSize = function(){
var el = document.getElementById('firstName');
el.size = el.value.length;
}
First Name: <input type="text" name="firstNa" size="3" oninput="renderNewSize()" id="firstName">
You can do it like this
function change_size(){
let input = document.getElementById("firstNa").value;
document.getElementById("firstNa").size = input.length;
}
First Name: <input type="text" id="firstNa" size = "3" oninput="change_size()">
I want to replace a number over 100 with commas. Like 1000 to 1,000 and 1000000 to 1,000,000 etc. in HTML. I have found the code on here to do so but it only works with predetermined numbers being passed. I don't want it to work for a predetermined number but for any number typed into the box.
<label for="turnover">Estimated Monthly Card Turnover:</label><br />
<span>£ </span><input type="text" id="turnover" maxlength="11"
name="turnover" size="10" required>*
<br /><br />
<script type="text/javascript">
$('#turnover').keydown(function(){
var str = $(this).val();
str = str.replace(/\D+/g, '');
$(this).val(str.replace(/\B(?=(\d{3})+(?!\d))/g, ","));});
</script>
I created a solution using pure javascript.
function onChange(el) {
var newValue = el.value.replace(/,/g, '');
var count = 0;
const last = newValue.substring(newValue.length - 1, newValue.length); // last input value
// check if last input value is real a number
if (!isNumber(last)) {
el.value = el.value.substring(0, el.value.length - 1);
return;
}
newValue = newValue.split('')
.reverse().map((it) => {
var n = it;
if (count > 0 && count % 3 == 0) n = n + ',';
count++;
return n;
})
.reverse().join('')
el.value = newValue
// document.getElementById('value').innerHTML = newValue
}
function isNumber(input) {
return input.match(/\D/g) == undefined;
}
<label>Number</label>
<input id="numbers" onkeyup="onChange(this)">
There are a couple of issues with your code:
It runs once when the page loads, not after that. I added a button to fix that.
The id used in your code does not match the actual id of the input field.
Input fields must be read and written using .val(). .text() works only for divs, spans etc.
Note that the conversion now works one time, after that it fails to properly parse the new text which now contains the comma(s).
function numberWithCommas(x) {
return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
function ShowComma() {
console.clear();
var val = parseInt($("#comma").val());
console.log(val);
val = numberWithCommas(val);
console.log(val);
$("#comma").val(val);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label for="turnover">Estimated Monthly Card Turnover:</label><br />
<span>£ </span><input type="value" id="comma" maxlength="30" name="turnover" size="10" required>*
<button onclick="ShowComma()">Show Comma</button>
To finalise this I have putgetElementById functions in so that this will work with a wordpress contact form 7. This must be with a text field though as it will not work with the number field as it will now accept commas:
<script>
document.getElementById("averagetrans").onkeyup = function() {onChange(this)};
document.getElementById("Turnover").onkeyup = function() {onChange(this)};
</script>
<script type="text/javascript">
function onChange(el) {
var newValue = el.value.replace(/,/g, '');
var count = 0;
const last = newValue.substring(newValue.length - 1, newValue.length); // last input value
// check if last input value is real a number
if (!isNumber(last)) {
el.value = el.value.substring(0, el.value.length - 1);
return;
}
newValue = newValue.split('')
.reverse().map((it) => {
var n = it;
if (count > 0 && count % 3 == 0) n = n + ','; // put commas into numbers 1000 and over
count++;
return n;
})
.reverse().join('')
el.value = newValue
// document.getElementById('value').innerHTML = newValue
}
function isNumber(input) {
return input.match(/\D/g) == undefined;
}
</script>
I want to show error message beside my textbox rather than alert in onkeyup event
HTML
<input type="textbox"
id="id_part_pay"
value="<?php echo $listing['part_pay'];?>"
name="part_pay"
/>
javascript
$("#id_part_pay").keyup(function()
{
var input = $('#id_part_pay').val();
var v =input % 10;
if (v!==0)
{
alert("Enter Percentage in multiple of 10");
}
if(input<20 || input>100)
{
alert("Value should be between 20 - 100");
return;
}
});`
Create a span beside input then change your code as
$(function() {
$("#id_part_pay").next('span').hide(); //Hide Initially
$("#id_part_pay").keyup(function() {
var input = $(this).val();
var v = input % 10;
var span = $(this).next('span'); //Get next span element
if (v !== 0) {
span.text("Enter Percentage in multiple of 10").show(); //Set Text and Show
return;
}
if (input < 20 || input > 100) {
span.text("Value should be between 20 - 100").show();//Set Text and Show
return;
}
span.text('').hide();//Clear Text and hide
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="textbox" id="id_part_pay" value="10" name="part_pay" />
<span></span>
I want to make a webpage that has two text boxes, a Celsius and Fahrenheit box. In between them, there is a convert button which converts Celsius to Fahrenheit and Fahrenheit to Celsius. If there is letters in either box, I want to cancel the converting and an alert pop up saying "Only numbers please!" So far, I haven't figured out how to get the alert and when I type numbers in the Celsius box, it always says the number -18 in the same box. Fahrenheit is fine.
HTML:
<html>
<head>
<title>Temparature Converter</title>
<script type="text/javascript" src="tempconversion.js"></script>
</head>
<body>
Celsius: <input id="c" onkeyup="convert('C')">
<button type="button" id="convert" onclick="convertTemp()">Convert</button>
Fahrenheit: <input id="f" onkeyup="convert('F')">
</body>
</html>
JavaScript:
function convertTemp(degree) {
if (degree == "C") {
F = document.getElementById("c").value * 9 / 5 + 32;
document.getElementById("f").value = Math.round(F);
} else {
C = (document.getElementById("f").value -32) * 5 / 9;
document.getElementById("c").value = Math.round(C);
}
}
Note: I got some code from W3Schools so I think the onkeyup convert is a little funny. If possible, please notify me how it has to change as well as the JavaScript.
There is no need for the onkeyup attributes, since they original code from W3Schools was designed to instantly update values as they were entered.
I did modify the functionality to clear of original value, that way the conversion button can work both ways with a simple code.
Here's a quick JavaScript to do the job:
function convertTemp() {
// Set the initial variables for c (Celsius) and f (Fahrenheit)
var c = document.getElementById('c'), f = document.getElementById('f');
// Test if there is a value for Celsius
if(c.value != '') {
// Set the value for Fahrenheit
f.value = Math.round(c.value * 9 / 5 + 32);
// Clear the value for Celsius
c.value = '';
// If there isn't a value for Celsius
} else {
// Set the value for Celsius
c.value = Math.round((f.value - 32) * 5 / 9);
// Clear the value for Fahrenheit
f.value = '';
}
}
And its accompanying HTML:
Celcius:<input id="c">
Fahrenheit:<input id="f">
<button type="button" id="convert" onclick="convertTemp()">Convert</button>
It can be tested at: http://jsfiddle.net/bhz6uz54/
Something to remember about simple code, like this, there is nothing to verify the supplied values are acceptable. A little regex can act as validation, but how it would be implemented depends on how you want to flag the problem.
I personally hate Do-it Buttons so I'd go with a more dynamic solution:
// Get the Input elements:
var $f = document.getElementById("f");
var $c = document.getElementById("c");
function FC_CF() {
var temp; // Will hold the temperature value
var $targ; // Used to target the element we're not typing into:
if (this.id === "c") { // If we're typing into #c...
$targ = $f; // use #f as target element
temp = (this.value * 9 / 5) + 32; // C2F
} else {
$targ = $c;
temp = (this.value - 32) * 5 / 9; // F2C
}
// Write the result "as we type" in the other ($targ) field:
$targ.value = !isNaN(temp) ? parseFloat(temp.toFixed(1)) : "Err";
// (Above:) temp is a num ? return floated number, else: "Show some error"
}
// Assign input listeners to trigger the above function:
$f.oninput = FC_CF;
$c.oninput = FC_CF;
Celcius: <input id="c">
Fahrenheit: <input id="f">
You can separate the functions which do the temperature conversion as follows i did somw changes in the code.
<p>
<label>Fahrenheit</label>
<input id="outputFahrenheit" type="number" placeholder="Fahrenheit"
oninput="temperatureConverterCelsius(this.value)"
onchange="temperatureConverterCelsius(this.value)" value="">
</p>
<p>Celsius: </p>
<input id="outputCelsius" type="number" placeholder="Celsius"
oninput="temperatureConverterFahrenheit(this.value)"
onchange="temperatureConverterFahrenheit(this.value)" value="">
</p>
<script type=""text/javascript>
function temperatureConverterCelsius(valNum) {
valNum = parseFloat(valNum);
document.getElementById("outputCelsius").value = (valNum-32) / 1.8;
//document.getElementById("outputFahrenheit").value = (valNum*1.8)+32;
}
</script>
</body>
</html>
class Temperature_conversation {
constructor(celsius) {
this.celsius= celsius;
this.fahrenheit= 0;
this.table_begin= -50.0;
this.table_end= 50.0;
this.table_step= 10.0;
console.log('---------------------Conversion--------------------------');
console.log('Celsius fahrenheit');
for(this.celsius = this.table_begin; this.celsius <= this.table_end; this.celsius += this.table_step){
this.fahrenheit = this.celsiusToFahrenhit(celsius);
}
}
celsiusToFahrenhit(c){
const minimun_celsius = -273.15;
if (c < minimun_celsius) {
throw 'O argumento es pequeno';
}
this.celsius = (9.0 / 5.0) * c+ 32;
var res = [this.celsius, this.fahrenheit]
console.table(res);
}
}
I have five form fields that will initially NOT be pre-populated with any values.
If a user fills out one of the fields, the next time they visit the form that field will be pre-populated with the value from the previous visit.
Here's what I'm trying: I'd like to create a loop that iterates through the fields. It will always check to see if there are empty fields. After finding 2 empty fields, the loop will stop and only show those 2 empty fields, while the other fields are hidden.
Here's what I have so far...I just can't figure how to stop after iterating through two fields,
HTML:
<form action="">
<input id="first" type="text" value="" />
<input id="second" type="text" value="" />
<input id="third" type="text" value="" />
<input id="fourth" type="text" value="" />
<input id="fifth" type="text" value="" />
</form>
JS:
$(document).ready(function() {
$('input').hide();
var firstValue = $('input[id="first"]').val(),
secondValue = $('input[id="second"]').val(),
thirdValue = $('input[id="third"]').val(),
fourthValue = $('input[id="fourth"]').val(),
fifthValue = $('input[id="fifth"]').val();
var firstField = $('input[id="first"]'),
secondField = $('input[id="second"]'),
thirdField = $('input[id="third"]'),
fourthField = $('input[id="fourth"]'),
fifthField = $('input[id="fifth"]');
var formValues = [firstValue, secondValue, thirdValue, fourthValue, fifthValue];
var fieldIds = [firstField, secondField, thirdField, fourthField, fifthField];
for (var i = 0; i < fieldIds.length; i++) {
for (var i = 0; i < formValues.length; i++) {
if ( formValues[i] === '' ) {
fieldIds[i].show();
return false;
}
}
}
});
Take all input fields, take the first two empty fields and show them; finally, take the complement of that to hide the rest:
var $inputFields = $('form input:text'),
$emptyFields = $inputFields
.filter(function() { return this.value == ''; })
.slice(0, 2)
.show();
$inputFields
.not($emptyFields)
.hide();
Demo
$(document).ready(function() {
$('input').hide().each( function(){
var index=0; //initilialize the counter
if( $(this).val().length ){ //check for input's length
if(index < 2) {
$(this).show();
index=index+1 //or index++ if you like
}
else {
break;
}
}
}
)};
If you want to include select and textarea fields in your eligible input population, use $(':input').hide().each(...). If you have multiple forms on your page, you would want to include that in your selector, too: $('#intended_form').find(':input').hide().each(...).
http://api.jquery.com/each/
I think that Jack provides the best answer, but this should work too. here, i use a second counter j and break the loop when j % 2 == 0, so at this time its found two empty fields. this is known as a modulus or the modulo operator.
$(document).ready(function() {
$('input').hide();
var firstValue = $('input[id="first"]').val(),
secondValue = $('input[id="second"]').val(),
thirdValue = $('input[id="third"]').val(),
fourthValue = $('input[id="fourth"]').val(),
fifthValue = $('input[id="fifth"]').val();
var firstField = $('input[id="first"]'),
secondField = $('input[id="second"]'),
thirdField = $('input[id="third"]'),
fourthField = $('input[id="fourth"]'),
fifthField = $('input[id="fifth"]');
var formValues = [firstValue, secondValue, thirdValue, fourthValue, fifthValue];
var fieldIds = [firstField, secondField, thirdField, fourthField, fifthField];
var j = 0;
for (var i = 1; i < fieldIds.length; i++) {
if ( formValues[i] === '' ) {
fieldIds[i].show();
j++;//we found an empty field
if (j % 2 == 0)
{
break;
}
}
}
});