addeventlistener to button code example

Example 1: javascript onclick event listener

document.getElementById("myBtn").addEventListener("click", function() {
  alert("Hello World!");
});

Example 2: javascript add listeners to class

var classname = document.getElementsByClassName("classname");

var myFunction = function() {
    var attribute = this.getAttribute("data-myattribute");
    alert(attribute);
};

for (var i = 0; i < classname.length; i++) {
    classname[i].addEventListener('click', myFunction, false);
}

Tags:

Javascript Example

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