Dayne Nienow

Dayne Nienow

1617764040

How to Remove JavaScript Event Listeners Attached to HTML Elements

Learn how to remove JavaScript event listeners attached to HTML elements

JavaScript provides a built-in function called removeEventListener() that you can use to remove event listeners attached to HTML elements. Suppose you have an event listener attached to a <button> element as follows:

<body>
  <button id="save">Save</button>
  <script>
    let button = document.getElementById("save");

    function fnClick(event) {
      alert("Button save is clicked");
    }

    button.addEventListener("click", fnClick);
  </script>
  <body></body>
</body>

#javascript #html

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Buddha Community

How to Remove JavaScript Event Listeners Attached to HTML Elements
Monty  Boehm

Monty Boehm

1669643708

How to Remove JavaScript Event Listeners Attached To HTML Elements

JavaScript: how to remove event listeners

JavaScript provides a built-in function called removeEventListener() that you can use to remove event listeners attached to HTML elements. Suppose you have an event listener attached to a <button> element as follows:

<body>
  <button id="save">Save</button>
  <script>
    let button = document.getElementById("save");

    function fnClick(event) {
      alert("Button save is clicked");
    }
    
    button.addEventListener("click", fnClick);
  </script>
  <body></body>
</body>

To remove the "click" event listener attached from the <script> tag above, you need to use the removeEventListener() method, passing the type of the event and the callback function to remove from the element:

button.removeEventListener("click", fnClick);

The above code should suffice to remove the "click" event listener from the button element. Notice how you need to call the removeEventListener() method on the element while also passubg the function fnClick reference to the method. To correctly remove an event listener, you need a reference both to the element with a listener and the callback function reference.

This is why it’s not recommended to pass a nameless callback function to event listeners as follows:

button.addEventListener("click", function(event){
  alert("Button save is clicked");
})

Without the callback function name as in the example above, you won’t be able to remove the event listener.

Removing event listener after click

Sometimes, you may also want to disable the button element and remove the event listener to prevent a double-click from your users. You can do so by writing the removeEventListener() method inside the addEventListener() method as shown below:

<body>
  <button id="save">Save</button>
  <script>
    let button = document.getElementById("save");

    function fnClick(event) {
      alert("Button save is clicked");
      button.disabled = true; // disable button
      button.removeEventListener("click", fnClick); // remove event listener
    }

    button.addEventListener("click", fnClick);
  </script>
</body>

In the code above, the button element will be disabled and the event listener will be removed after a "click" event is triggered.

And that’s how you remove JavaScript event listeners attached to HTML elements. You need to keep references to the element you want to remove the listener from, the type of the event, and the callback function executed by the event so that you can remove the event listener without any error.

Original article source at: https://sebhastian.com/

#javascript #event #elements 

Dayne Nienow

Dayne Nienow

1617764040

How to Remove JavaScript Event Listeners Attached to HTML Elements

Learn how to remove JavaScript event listeners attached to HTML elements

JavaScript provides a built-in function called removeEventListener() that you can use to remove event listeners attached to HTML elements. Suppose you have an event listener attached to a <button> element as follows:

<body>
  <button id="save">Save</button>
  <script>
    let button = document.getElementById("save");

    function fnClick(event) {
      alert("Button save is clicked");
    }

    button.addEventListener("click", fnClick);
  </script>
  <body></body>
</body>

#javascript #html

Gaurav Sen

Gaurav Sen

1622696775

Understand JavaScript Event Listeners

You will be using events in almost every web app that you build. Therefore it is important to understand the basics of JavaScript events.

Understanding JavaScript Event Listeners

After watching this video you will have an understanding of event listeners - how to add them, remove them. Grasp advanced concepts such as bubbling and capturing. What is the event object? How does event propagation occur and how prevent the default behaviour of an event.

#javascript #event #event-listener #html5 #dom #web-development

Lyda  White

Lyda White

1628189100

How to Image Uploader with Preview || Html CSS JavaScript

Image Uploader with Preview || Html CSS JavaScript || #html #css #javascript #coding

#html #css #javascript 

w3hubs com

w3hubs com

1661626407

Display Current Time Using HTML,CSS And JavaScript

In this Display Current Time, we were Using HTML, CSS And JavaScript. We used the javascript inbuild function for a time, and to display, we used javascript DOM. To show the live time, we used javascript setInterval functions.

Also Read:- Bootstrap Progress Bar Percentage Using Jquery

For the responsive side, we used CSS media queries. Also, to make it more attractive, we used a background image with an opacity background.

Make it yours now by using it, downloading it, and please share it. we will design more elements for you.

Source Code

 

#javascript #JavaScript #html #HTML