JQuery Detect class changes

Question

I am using a plugin that added a class open to .slide-out-div when opened.

So I am trying to change some css if the open is detected.

Answer 1

There is no event of class-added, you will need to track it yourself...

It can be done with an infinite loop with setTimeout to check if the class has changed.

function checkForChanges()
{
    if ($('.slide-out-div').hasClass('open'))
        $('.otherDiv').css('top','0px');
    else
        setTimeout(checkForChanges, 500);
}

You can call the function when you want, or onDOM ready:

$(checkForChanges);

Answer 2

The question's a bit old, but since I came across while looking for a similar problem, thought I'd share the solution I went with here - Mutation Observers

In your case, I'd create a mutation observer

var mut = new MutationObserver(function(mutations, mut){
  // if attribute changed === 'class' && 'open' has been added, add css to 'otherDiv'
});
mut.observe(document.querySelector(".slide-out-div"),{
  'attributes': true
});

The function in mutation observer is called any time an attribute of .slide-out-div is changed, so need to verify the actual change before acting.

More details here on Mozilla's documentation page

Answer 3

You can use attrchange jQuery plugin. The main function of the plugin is to bind a listener function on attribute change of HTML elements.

Code sample:

$("#myDiv").attrchange({
    trackValues: true, // set to true so that the event object is updated with old & new values
    callback: function(evnt) {
        if(evnt.attributeName == "class") { // which attribute you want to watch for changes
            if(evnt.newValue.search(/open/i) == -1) { // "open" is the class name you search for inside "class" attribute

                // your code to execute goes here...
            }
        }
    }
});