JQUERY ON('change') get checkbox value and state

Question

How can I "get" the checkbox that changed inside div "containerDIV"?

View:

@model MyModel

<div id="containerDIV">
<ul id="CheckBoxList">
@foreach (XObject t in MyModel.XCollection)
         {
         <li>
           <input type="checkbox" value="@t.id"/>
         </li>
         }
</ul>

On the JavaScript (Jquery) side, I have this:

$('#containerDIV').on('change', '#CheckBoxList', function (event) {

    var id = $(this).val(); // this gives me null
    if (id != null) {
      //do other things
    }

});

It's clear that $this is not the checkbox, it's the div containerDIV or checkBoxList

How can I get to the checkbox's state and value?

Solution 1

If your input is not being created dynamically after the DOM loads you can just call:

$('#CheckBoxList input[type=checkbox]').change(function() {

  var id = $(this).val(); // this gives me null
  if (id != null) {
    //do other things
  }

});

or to use .on() you just need to target the input that's getting clicked:

$('#CheckBoxList').on('change', 'input[type=checkbox]', function() {

  var id = $(this).val(); // this gives me null
  if (id != null) {
    //do other things
  }

});

FIDDLE

Solution 2

The way i got it to work correctly was using .is(':checked').

$('selector').change(function (e) {
        // checked will equal true if checked or false otherwise
        const checked = $(this).is(':checked')); 
});

Solution 3

If you can, add the events as an attribute, like onchange='function(this);'. This returns the element to the function, so you can get data such as it's ID, or just modify it like that.

---

Good Luck!

Comments

[The One]

I can't do that, the view is a partial view, and when it gets replaced, I loose the "binding" between JQUERY and the DOM

[jmore009]

@216 look at the second example i posted

[jmore009]

@216 added a fiddle too

[Sizzling Code]

This is more better approach.