Input event listener not firing for classes

Question

I have a CSS class for 3 input boxes, called .rgb . In this .rgb class are three input boxes with ID's of: #rgb , #rgb2 and #rgb3 .

I am trying to capture when any of the three input boxes have text inputted using .addEventListener although it isn't working when I select the elements by class name. No innerHTML is being appended

Below is my minified code for this example:

document.getElementsByClassName('rgb').addEventListener("input", function() {
    // Stores the r, g, b values
    var r = document.getElementById('rgb').value;
    var g = document.getElementById('rgb2').value;
    var b = document.getElementById('rgb3').value;

    document.getElementById('rgb-output').innerHTML = 'RGB: rgb(' + r + ', ' + g + ', ' + b + ')';
    document.getElementById('hex-output').innerHTML = 'HEX: ' + rgbToHEX(r, g, b).toUpperCase();
}, false);

How can I modify the code so that it listens for input on all three input boxes under the .rgb class?

Answer 1

The result of getElementsByClassName is a node-list. You can't attach an event handler to a node list. You have to go into the node list and attach the handlers to the individual elements stored in that node list.

  var theInputs = document.querySelectorAll('.rgb') for(var i = 0; i < theInputs.length; ++i){ theInputs[i].addEventListener("input", calc); } function calc() { // Stores the r, g, b values var r = document.getElementById('rgb').value; var g = document.getElementById('rgb2').value; var b = document.getElementById('rgb3').value; document.getElementById('rgb-output').innerHTML = 'RGB: rgb(' + r + ', ' + g + ', ' + b + ')'; document.getElementById('hex-output').innerHTML = 'HEX: ' + rgbToHEX(r, g, b).toUpperCase(); } function rgbToHEX(){ return "it works!"; } 

 <input class="rgb" id="rgb"> <input class="rgb" id="rgb2"> <input class="rgb" id="rgb3"> <div id="rgb-output"></div> <div id="hex-output"></div>