How to get list of Css class use in the HTML file?

Question

I need list of classes used in an html file. Is there any tool where i can get list of classes in the HTML file?

Answer 1

Pure Javascript Code will list all the unique classes.

var lst=[];
document.querySelectorAll("[class]").forEach( (e)=>{  
e.getAttribute("class").split(" ").forEach( (cls)=>{if( cls.length>0 && lst.indexOf(cls)<0) lst.push(cls);}
);
 });
console.log(lst.sort());

Answer 2

I know this is an old question, but got here through google so I suspect more people can get here too.

The shortest way, using querySelectorAll and classList (which means, browser support could be an issue: IE10 for classList and IE8 for querySelectorAll ), and with duplicates, would be:

var classes = 0, 
elements = document.querySelectorAll('*');

for (var i = 0; i < elements.length; i++) {
    classes = classes + elements[i].classList.length;        
}

I made a jsFiddle with a fallback for classList (which has the "lowest" browser support) that also counts all elements, all classes and all elements with classes if you're not using classList.

I didn't add a unique detection though, might get to it some day.

Answer 3

Take a look at Dust Me Selectors.

It's not exactly what you are looking for, it shows a list of UNused selectors. However, I imagine you could use the inverse of the list it provides.

Here is the link: http://www.sitepoint.com/dustmeselectors/

Answer 4

this should work and it doesn't need jquery.

var used = [];
var elements = null;

//get all elements
if (typeof document.getElementsByTagName != 'undefined') {
    elements = document.getElementsByTagName('*');
}

if (!elements || !elements.length) {
    elements = document.all; // ie5
}

//loop over all element
for (var i = 0; i < elements.length; i++){

    //loop over element's classes
    var classes = elements[i].className.split(' ');
    for (var j = 0; j < classes.length; j++) {

        var name = classes[j];

        //add if not exists
        if (name.length > 0 && used.indexOf(name) === -1) {
            used.push(name);
        }
    }
}

alert(used.join(' '));

es6 version

let used = new Set();
let elements = document.getElementsByTagName('*');
for (let { className = '' } of elements) {
    for (let name of className.split(' ')) {
        if (name) {
            used.add(name);
        }
    }
}
console.log(used.values());

more functional approach

var elements = document.getElementsByTagName('*');

var unique = function (list, x) {
    if (x != "" && list.indexOf(x) === -1) {
        list.push(x);
    }
    return list;
};

var trim = function (x) { return x.trim(); };

var classes = [].reduce.call(elements, function (acc, e) {
    return e.className.split(' ').map(trim).reduce(unique, acc);
}, []);

Answer 5

If you've got jQuery on the page, run this code:

var classArray = [];
$('*').each(function(){if(this.className!=""){classArray.push(this.className)}})

The variable classArray will contain all the classes specified on that HTML page.

Answer 6

Quickly list classes from console (ignoring 'ng-*' angular classes)

(global => {
    // get all elements
    const elements = document.getElementsByTagName('*');
    // add only unique classes
    const unique = (list, x) => {
        x != '' && list.indexOf(x) === -1 && x.indexOf('ng-') !== 0 && list.push(x);                    
        return list;
    };
    // trim
    const trim = (x) => x.trim();
    // add to variable
    global.allClasses = [].reduce.call(elements, (acc, e) => e.className.split(' ').map(trim).reduce(unique, acc), []).sort();
    console.log(window.allClasses);
})(window);