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Other References

CSSStyleDeclaration JS Conversion


onclick Event

Example

Execute a JavaScript when a button is clicked:

<button onclick="myFunction()">Click me</button>
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More examples below.


Definition and Usage

The onclick event occurs when the user clicks on an HTML element.


Syntax

In HTML:

<element onclick="myScript">
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In JavaScript:

object.onclick = function(){myScript};
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In JavaScript, using the addEventListener() method:

object.addEventListener("click", myScript);
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Technical Details

Bubbles: Yes
Cancelable: Yes
Event type: MouseEvent
Supported
HTML tags:
All exept: <base>, <bdo>, <br>, <head>, <html>, <iframe>, <meta>, <param>, <script>, <style>, and <title>

More Examples

Click a <button> to display the date:

<button onclick="getElementById('demo').innerHTML = Date()">What is the time?</button>
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Click a <h3> element to change the text color:

<h3 id="demo" onclick="myFunction()">Click me to change my color.</h3>

<script>
function myFunction() {
  document.getElementById("demo").style.color = "red";
}
</script>
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Another example on how to change the color of an element:

<h3 onclick="myFunction(this, 'red')">Click me to change my color.</h3>

<script>
function myFunction(element, color) {
  element.style.color = color;
}
</script>
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Click to copy text from one input field to another:

<button onclick="myFunction()">Copy Text</button>

function myFunction() {
  document.getElementById("field2").value =   document.getElementById("field1").value;
}
</script>
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How to assign an "onclick" event to the window object:

window.onclick = myFunction;

function myFunction() {
  document.getElementsByTagName("BODY")[0].style.backgroundColor = "yellow";
}
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Use onclick to create a dropdown:

document.getElementById("myBtn").onclick = function() {myFunction()};

function myFunction() {
  document.getElementById("myDropdown").classList.toggle("show");
}
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Browser Support

onclick is a DOM Level 2 (2001) feature.

It is fully supported in all browsers:

Chrome IE Edge Firefox Safari Opera
Yes 9-11 Yes Yes Yes Yes