Question

I have a checkbox-button-group like this:

<div class="btn-group" id="id_group" data-toggle="buttons-checkbox">
  <button class="btn myclass" type="button" data-value="0">Value 0</button>
  <button class="btn myclass" type="button" data-value="1">Value 1</button>
</div>

And the JS event handler:

$(".myclass").click(function(event) {
  console.log($(".myclass.active").length);
  console.log($(this).hasClass("active"));
});

I want to get the data-value for all checked buttons, but on the click event, the active class is not yet set. That means, when I first click a button, the output is:

>>> 0
>>> false

And the next time I click the same button (i.e., uncheck it), the output is:

>>> 1
>>> true

That means the active class is being set after the event.

How can I get the real state of the button during the click event?

Answer 1

If you desperately want an event each time the class active is added to a button, you could modify the bootstrap.js. active is set/unset in a small function Button.prototype.toggle triggered by click, line 1362-1370 :

Button.prototype.toggle = function () {
    var $parent = this.$element.closest('[data-toggle="buttons-radio"]')

    $parent && $parent
      .find('.active')
      .removeClass('active')

    this.$element.toggleClass('active')
  }

change this to

Button.prototype.toggle = function () {
    var $parent = this.$element.closest('[data-toggle="buttons-radio"]')

    $parent && $parent
      .find('.active')
      .removeClass('active')

    this.$element.toggleClass('active')

    if (this.$element.hasClass('active')) {
        this.$element.trigger('active')
    }
  }

now you have an event you can bind to .myclass

$(".myclass").on('active', function() {
  console.log($(".myclass.active").length);
  console.log($(this).hasClass("active"));
});

OR, if you think the above is too dirty – you can extend / modify the Button.prototype (adding methods, options etc) by following the skeleton described here How to Extend Twitter Bootstrap Plugin