The equivalent of an event listener in event handling

Here is an example of how to set up event listeners:

document.getElementById("A").addEventListener("change", function (e) {
   // do something when A changes
}, false)

document.getElementById("B").addEventListener("click", function (e) {
  // do something when B is clicked
}, false)

I have two queries:

  1. How can I write this in the event handler version?
  2. How should I invoke it?

This is a suggested structure:

<script type="text/javascript">
    function [function for question 1]
    {
    // do something when A changes
    }
    function [function for question 2]
    {
    // do something when B is clicked
    }
</script>

<div id="A" change="[function for question 2]"></div>
<div id="B" click="[function for question 2]"></div>

Answer №1

Would you like to achieve this?

<script type="text/javascript">
    function performAction1(event)
    {
         // execute code when A changes
    }
    function performAction2(event)
    {
         // execute code when B is clicked
    }
</script>

<div id="A" onChange="performAction1(event)"></div>
<div id="B" onClick="performAction2(event)"></div>

An example can be found here: JSFiddle

An event handler functions similarly to an event listener. The inline approach shown above may not be ideal for performance and maintenance purposes, as discussed in this article: http://example.com/article

I hope this information proves useful!

Best regards,

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