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Home Web Front-end JS Tutorial How to write onclick event in js

How to write onclick event in js

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May 06, 2024 pm 02:42 PM

The onclick event is an event handler in JavaScript that specifies code to be executed when an element is clicked. The steps are as follows: 1. Select the element, 2. Set the onclick attribute, 3. Define the function. Actions you can perform using the onclick event include changing styles, triggering navigation, opening modal windows, validating forms, and submitting data.

How to write onclick event in js

How to write the onclick event in JavaScript

The onclick event is an important event handler in JavaScript. Allows us to specify code to be executed when an element is clicked.

Syntax: 

<code>element.onclick = function() {
  // 执行代码
};</code>
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Steps:

  1. Select elements: Select using JavaScript The handler selects the element to add the event handler to.
  2. Set the onclick attribute: Set the onclick attribute for the selected element. The value of this attribute is a function that will be executed when the element is clicked.
  3. Define the function: In the onclick function, define the code you want to execute when the element is clicked.

Example:

In the following example, we will create a button and add an onclick event handler that when the button is clicked, it Will change the background color of the page: 

<code><button id="myButton">点击我</button>

<script>
  const button = document.getElementById("myButton");

  button.onclick = function() {
    document.body.style.backgroundColor = "blue";
  };
</script></code>
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Other uses:

In addition to changing styles, the onclick event can also be used for:

  • Trigger navigation
  • Open modal window
  • Validate form
  • Submit data

Note:

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