This manual will theoretically and practically compare the addEventListener and the onclick event.
The addEventListener() method includes an event in its argument. Moreover, it can apply multiple event handlers to the same element and does not overwrite multiple event handlers simultaneously. Whereas the onclick event is triggered when the user clicks on the corresponding button against the event. It is just a property of the HTMLElement object and can be overwritten, unlike the addEventListener() method.
In the given syntax, “event” refers to the specified event, “listener” is the function that will be invoked, and “useCapture” is the optional value.
In the given syntax, “element” indicates the element with which the “onclick” event will be associated. Here, “myScript” refers to the function that will be called upon which the onclick event will occur.
Similarly, in the above syntax, “object” refers to the object associated with the onclick event.
Core Differences Between addEventListener and onclick Event
|addEventListener does not work in the older versions of some browsers.||onclick is compatible with all browsers.|
|This function can attach multiple events to a particular element.
|This event associates only a single event to an element.
Now, let’s go through the following examples to understand the stated difference clearly.
Example: addEventListener() Method to Detect if the Particular Key is Pressed
In this particular example, apply the “document.addEventListener()” method and attach an event named “keydown” in its argument. This will result in notifying the user via alert when the “Enter” key is pressed:
The corresponding output will be:
Example: Onclick Event to Change Button Color
In the following example, we will create a button having the “button” id. Then, include an “onclick” event which will invoke the function buttonColor() upon the button click:
Now, define a function named “buttonColor()”. In the function definition, access the button using the “document.geElementById()” method. Also, apply the style.backgroundColor property in order to to set the button’s color and assign it an RGB color code as its background:
Now, fetch the created button using the “document.getElementById()” method and apply the “onclick” event on it. Now, repeat all the further steps for changing the button’s color:
It will result in the same output: