Get class list for element with jQuery

Get class list for element with jQuery

Is there a way in jQuery to loop through or assign to an array all of the classes that are assigned to an element?
ex.

Hello World!

I will be looking for a “special” class as in “dolor_spec” above. I know that I could use hasClass() but the actual class name may not necessarily be known at the time.

Solutions/Answers:

Solution 1:

You can use document.getElementById('divId').className.split(/\s+/); to get you an array of class names.

Then you can iterate and find the one you want.

var classList = document.getElementById('divId').className.split(/\s+/);
for (var i = 0; i < classList.length; i++) {
    if (classList[i] === 'someClass') {
        //do something
    }
}

jQuery does not really help you here…

var classList = $('#divId').attr('class').split(/\s+/);
$.each(classList, function(index, item) {
    if (item === 'someClass') {
        //do something
    }
});

Solution 2:

Why has no one simply listed.

$(element).attr("class").split(' ');

Solution 3:

Here is a jQuery plugin which will return an array of all the classes the matched element(s) have

;!(function ($) {
    $.fn.classes = function (callback) {
        var classes = [];
        $.each(this, function (i, v) {
            var splitClassName = v.className.split(/\s+/);
            for (var j = 0; j < splitClassName.length; j++) {
                var className = splitClassName[j];
                if (-1 === classes.indexOf(className)) {
                    classes.push(className);
                }
            }
        });
        if ('function' === typeof callback) {
            for (var i in classes) {
                callback(classes[i]);
            }
        }
        return classes;
    };
})(jQuery);

Use it like

$('div').classes();

In your case returns

["Lorem", "ipsum", "dolor_spec", "sit", "amet"]

You can also pass a function to the method to be called on each class

$('div').classes(
    function(c) {
        // do something with each class
    }
);

Here is a jsFiddle I set up to demonstrate and test http://jsfiddle.net/GD8Qn/8/

Minified Javascript

;!function(e){e.fn.classes=function(t){var n=[];e.each(this,function(e,t){var r=t.className.split(/\s+/);for(var i in r){var s=r[i];if(-1===n.indexOf(s)){n.push(s)}}});if("function"===typeof t){for(var r in n){t(n[r])}}return n}}(jQuery);

Solution 4:

On supporting browsers, you can use DOM elements’ classList property.

$(element)[0].classList

It is an array-like object listing all of the classes the element has.

If you need to support old browser versions that don’t support the classList property, the linked MDN page also includes a shim for it – although even the shim won’t work on Internet Explorer versions below IE 8.

Solution 5:

You should try this one:

$("selector").prop("classList")

It returns an array of all current classes of the element.

Solution 6:

var classList = $(element).attr('class').split(/\s+/);
$(classList).each(function(index){

     //do something

});