onclick Event
Example
Execute a JavaScript when a button is clicked:
<button onclick="myFunction()">Click me</button>
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More "Try it Yourself" examples below.
Definition and Usage
The onclick event occurs when the user clicks on an element.
Browser Support
| Event | |||||
|---|---|---|---|---|---|
| onclick | Yes | Yes | Yes | Yes | Yes |
Syntax
In JavaScript, using the addEventListener() method:
object.addEventListener("click", myScript);
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Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions.
Technical Details
| Bubbles: | Yes |
|---|---|
| Cancelable: | Yes |
| Event type: | MouseEvent |
| Supported HTML tags: | All HTML elements, EXCEPT: <base>, <bdo>, <br>, <head>, <html>, <iframe>, <meta>, <param>, <script>, <style>, and <title> |
| DOM Version: | Level 2 Events |
More Examples
Example
Click on a <button> element to display the current day, date and time:
<button onclick="getElementById('demo').innerHTML=Date()">What
is the time?</button>
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Example
Click on a <p> element to change its text color to red:
<p id="demo" onclick="myFunction()">Click me to change my text color.</p>
<script>
function myFunction() {
document.getElementById("demo").style.color = "red";
}
</script>
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Example
Another example on how to change the color of a <p> element by clicking on it:
<p id="demo" onclick="myFunction(this, 'red')">Click me to change my text
color.</p>
<script>
function myFunction(elmnt,clr) {
elmnt.style.color = clr;
}
</script>
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Example
Click on a button to copy some text from an input field to another input field:
<button onclick="myFunction()">Copy Text</button>
<script>
function myFunction() {
document.getElementById("field2").value =
document.getElementById("field1").value;
}
</script>
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Example
Assign the "onclick" event to the window object:
window.onclick = myFunction;
// If the user clicks in the window, set
the background color of <body> to yellow
function myFunction() {
document.getElementsByTagName("BODY")[0].style.backgroundColor = "yellow";
}
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Example
Using onclick to create a dropdown button:
// Get the button, and when the user clicks on it, execute myFunction
document.getElementById("myBtn").onclick = function() {myFunction()};
/* myFunction toggles between adding and removing the show class, which
is used to hide and show the dropdown content */
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
// Close the dropdown if the user clicks outside of it
window.onclick =
function(event) {
if (!event.target.matches('.dropbtn')) {
var dropdowns = document.getElementsByClassName("dropdown-content");
var i;
for (i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.classList.contains('show'))
{
openDropdown.classList.remove('show');
}
}
}
}
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Related Pages
HTML DOM reference: ondblclick event
HTML DOM reference: onmousedown event
HTML DOM reference: onmouseup event
Event Object
