We Keep Coding

textbox input value not changing [duplicate]

This question already has answers here:
Enter data into a custom-handled input field
(2 answers)
Closed 2 years ago.
The following code changes the 'text' of the field but it is not picked up by the website. When you submit the form, it says the field is still empty and to enter a valid number.
var number = 123;
var field = document.getElementById('textfield');
field.value = number;
The code above only visually changes the textbox's input. Is there a way to imitate a physical field entry (to have it picked up by the form)?
The type changes from text when its not selected to number when selected.

Edit: I still haven't seen your submit function so I included one as an example below.
Is this what you are expecting?
var number = 123;
var field = document.getElementById('td-wb-order-price-amount-limit-price');
var example = document.getElementById('example');
function clickMe() {
field.value = number.toString();;
example.innerHTML = "Your input value is " + number;
}
<input _ngcontent-axt-c487="" name="limitPrice" type="text" tdwbinput="" tdwbnumberinput="n4-2"
required="" nonzero="" min="0" maxlength="7" tdwbnumberinputgroupseparator="true"
class="td-wb-order-price-amount__input-limit-price td-wb-input ng-untouched ng-pristine ng-invalid"
id="td-wb-order-price-amount-limit-price" autocomplete="off" aria-invalid="false">
<button onclick="clickMe();">Click </button>
<p id="example"></p>

You will need onchange attribute to detect the change in the input field.
const handleChange = () => {
const inputValue = document.getElementById('input').value;
console.log(inputValue)
}
<input type="text" id="input" onchange="handleChange()" />

Javascript parameters getting concatenated on trying to find sum [duplicate]

This question already has answers here:
Adding two numbers concatenates them instead of calculating the sum
(24 answers)
Closed 2 years ago.
In this script i am passing number values but i get them as concatenated values.Why is javascript behaving so.I use a function named add and passing two number parameters.Why is it considered as string.I am using chrome browser
<input type="number" id="num1"/>
<input type="number" id="num2"/>
<button onclick='alert(add(document.getElementById("num1").value,document.getElementById("num2").value))' >sum</button>
<script>
const add=function( num1, num2){
return num1+num2;
}
</script>

You should avoid inline javascript and place javascript code in external js file. For better readability, debug and testing purposes.
From #Sascha answer you should convert input text to number and then do the calculations using parseInt. Also, check #Ajeet_Eppakayala answer as an alternative solution.
let submBtn = document.getElementById('sbtBtn');
function calculate(e){
e.preventDefault();
let num1El = document.getElementById('num1');
let num2El = document.getElementById('num2');
let res = document.getElementById('result');
let num1 = parseInt(num1El.value);
let num2 = parseInt(num2El.value);
if (Number.isInteger(num1) && Number.isInteger(num2)){
res.innerHTML = add(num1,num2);
}else{
res.innerHTML = "Please enter numbers";
num1El.focus();
}
}
const add = (num1,num2) => {
return parseInt(num1) + parseInt(num2);
}
submBtn.addEventListener('click',calculate);
<form>
<input type="text" id="num1" />
<input type="text" id="num2" />
<input type="submit" id="sbtBtn" value="Sum" />
<p id="result"><p>
</form>

Because you get the values from an Input-field and this is allways from type string. So you had to use parseInt to get an Integer.
const add=function( num1, num2){
return parseInt(num1)+parseInt(num2);
}
<input type="number" id="num1"/>
<input type="number" id="num2"/>
<button onclick='alert(add(document.getElementById("num1").value,document.getElementById("num2").value))' >sum</button>

You need to parse values to int.
ShortHand for Int parsing is + operator or simple parseInt(<stringNumber>).
const add = function( num1, num2){
return +num1 + +num2;
}
<input type="number" id="num1"/>
<input type="number" id="num2"/>
<button onclick='alert(add(document.getElementById("num1").value,document.getElementById("num2").value))' >sum</button>

How to correctly use innerHTML to change text in text field [duplicate]

This question already has answers here:
Beginning JavaScript - displaying temperature value in Inner HTML
(3 answers)
Closed 4 years ago.
There are 3 text fields in my programm. First two im using to write some words in there, then after pressing button the longest word should appear in third text field, but nothing happens.
I was trying to use innerHTML but guess im using it incorrectly.
document.getElementById("button").onclick= function(){
var a = document.getElementById("one")
var b = document.getElementById("two")
var c = document.getElementById("three")
if(a.value.length>b.value.length){
c.innerHTML = a.value
} else{
c.innerHTML = b.value
}
}
<input type="text" id="one"/>
<input type="text" id="two"/>
<input type="text" id="three"/>
<button id="button">Button</button>
So nothing happens with third text field when im pressing button there is no longest word. All code working correctly, only problem with innerHTML

Use .value if you want to set values in input not innerHTML
document.getElementById("button").onclick= function(){
var a = document.getElementById("one")
var b = document.getElementById("two")
var c = document.getElementById("three")
if(a.value.length>b.value.length){
c.value = a.value
} else{
c.value = b.value
}
}
<input type="text" id="one"/>
<input type="text" id="two"/>
<input type="text" id="three"/>
<button id="button">Button</button>

**innerHTML ** : It refers to html content inside an element. This is used to get or set the html content. Generally used for div, span and p.
value : It refers to actual value of an element. Generally used for input elements.
Refer : Diff between value & innerHTML
Hence in your case, you should use c.value instead of c.innerHTML.

How can I make to accept only numbers in input? [duplicate]

This question already has answers here:
HTML text input allow only numeric input
(78 answers)
Closed 8 years ago.
How can I make to accept only numbers inputs in my code: -->> Here ?
Thank you !

You can do this:
<input type="number">
or this:
<input type="text" pattern="[0-9]+">
These will only work in HTML5 compatible browsers.
In javascript you can do this:
JSFiddle
HTML:
<input type="text" id="test" name="test"/>
CSS:
var input = document.getElementById("test");
input.oninput = function(e){
if (/\D/g.test(this.value))
{
// Filter non-digits from input value.
this.value = this.value.replace(/\D/g, '');
}
}

Turn a form into an associative array in Jquery [duplicate]

This question already has answers here:
Convert form data to JavaScript object with jQuery
(58 answers)
Closed 9 years ago.
I have the following form:
<form id="editForm">
<input class="span12" name="name" type="text" placeholder="Product name...">
<input class="span12" name="sku" type="text" placeholder="SKU...">
<input name="basePrice" class="span12" type="text" placeholder="Base price...">
</form>
How do I turn that into an associative array that can be accessed like the following?
formArray['name'], formArray['sku'], etc.

Here's a dead-simple way:
$.fn.form = function() {
var formData = {};
this.find('[name]').each(function() {
formData[this.name] = this.value;
})
return formData;
};
// use like
var data = $('#editForm').form();
This is totally unsafe and just grabs everything with a name, but it should get you started.