How change content value of pseudo :before element by Javascript

Question

I have the grap constructured by CSS, which is dynamically changes by JS. I show graph max value by pseudo element as:

.graph:before {
    content:\"\"; //va         


        

Answer 1

I hope the below snippet might help, you can specify the content value you want via JS using the CSS attr() function. Below you have two options: to use JavaScript or jQuery:

jQuery:

$('.graph').on('click', function () {
    //do something with the callback
    $(this).attr('data-before','anything'); //anything is the 'content' value
});

JavaScript:

var graphElem = document.querySelector('.graph');
graphElem.addEventListener('click', function (event) {
    event.target.setAttribute('data-before', 'anything');
});

CSS:

.graph:before {
    content: attr(data-before); /* value that that refers to CSS 'content' */
    position:absolute;
    top: 0;
    left: 0;
}