[javascript] How to fire an event on class change using jQuery?

Use trigger to fire your own event. When ever you change class add trigger with name

JS Fiddle DEMO

$("#main").on('click', function () {
    $("#chld").addClass("bgcolorRed").trigger("cssFontSet");
});

$('#chld').on('cssFontSet', function () {

    alert("Red bg set ");
});

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