HTML DOM addEventListener() Method
Example
Attach a click event to a <button> element. When the user clicks on the button, output "Hello World" in a <p> element with id="demo":
document.getElementById("myBtn").addEventListener("click", function() {
document.getElementById("demo").innerHTML = "Hello World";
});
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More "Try it Yourself" examples below.
Definition and Usage
The addEventListener() method attaches an event handler to the specified element.
Tip: Use the removeEventListener() method to remove an event handler that has been attached with the addEventListener() method.
Tip: Use the document.addEventListener() method to attach an event handler to the document.
Browser Support
The numbers in the table specify the first browser version that fully supports the method.
| Method | |||||
|---|---|---|---|---|---|
| addEventListener() | 1.0 | 9.0 | 1.0 | 1.0 | 7.0 |
Syntax
element.addEventListener(event, function, useCapture)
Parameter Values
| Parameter | Description |
|---|---|
| event | Required. A String that specifies the name of the event. Note: Do not use the "on" prefix. For example, use "click" instead of "onclick". For a list of all HTML DOM events, look at our complete HTML DOM Event Object Reference. |
| function | Required. Specifies the function to run when the event occurs. When the event occurs, an event object is passed to the function as the first parameter. The type of the event object depends on the specified event. For example, the "click" event belongs to the MouseEvent object. |
| useCapture |
Optional. A Boolean value that specifies whether the event should be
executed in the capturing or in the bubbling phase. Possible values:
|
Technical Details
| DOM Version: | DOM Level 2 Events |
|---|---|
| Return Value: | No return value |
| Changelog: | The useCapture parameter became optional in Firefox 6 and Opera 11.60 (has always been optional for Chrome, IE and Safari) |
More Examples
Example
You can also refer to an external "named" function.
This example demonstrates how to execute a function when a user clicks on a <button> element:
document.getElementById("myBtn").addEventListener("click", myFunction);
function myFunction() {
document.getElementById("demo").innerHTML = "Hello World";
}
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Example
You can add many events to the same element, without overwriting existing events.
This example demonstrates how to add two click events on the same <button> element:
document.getElementById("myBtn").addEventListener("click", myFunction);
document.getElementById("myBtn").addEventListener("click", someOtherFunction);
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Example
You can add events of different types to the same element.
This example demonstrates how to add many events on the same <button> element:
document.getElementById("myBtn").addEventListener("mouseover", myFunction);
document.getElementById("myBtn").addEventListener("click", someOtherFunction);
document.getElementById("myBtn").addEventListener("mouseout", someOtherFunction);
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Example
When passing parameter values, use an "anonymous function" that calls the specified function with the parameters:
document.getElementById("myBtn").addEventListener("click", function() {
myFunction(p1, p2);
});
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Example
Change the background color of a <button> element:
document.getElementById("myBtn").addEventListener("click", function() {
this.style.backgroundColor = "red";
});
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Example
Using the optional useCapture parameter to demonstrate the difference between bubbling and capturing:
document.getElementById("myDiv").addEventListener("click", myFunction, true);
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Example
Using the removeEventListener() method to remove an event handler that has been attached with the addEventListener() method:
// Attach an event handler to <div>
document.getElementById("myDIV").addEventListener("mousemove", myFunction);
// Remove the event handler from <div>
document.getElementById("myDIV").removeEventListener("mousemove", myFunction);
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Example
For browsers that don't support the addEventListener() method, you can use the attachEvent() method.
This example demonstrates a cross-browser solution:
var x = document.getElementById("myBtn");
if (x.addEventListener) { // For all major browsers, except IE 8 and earlier
x.addEventListener("click", myFunction);
} else if (x.attachEvent) { // For IE 8 and earlier versions
x.attachEvent("onclick", myFunction);
}
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Related Pages
JavaScript Tutorial: HTML DOM EventListener
HTML DOM Reference: document.addEventListener()
