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":
More "Try it Yourself" examples below.
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.
The numbers in the table specify the first browser version that fully supports the method.
Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions, and Opera 7.0 and earlier versions. However, for these specific browser versions, you can use the attachEvent() method to attach event handlers (see "More Examples" for a cross-browser solution).
|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.
Optional. A Boolean value that specifies whether the event should be
executed in the capturing or in the bubbling phase.
|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)|
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:
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:
You can add events of different types to the same element.
This example demonstrates how to add many events on the same <button> element:
When passing parameter values, use an "anonymous function" that calls the specified function with the parameters:
Change the background color of a <button> element:
Using the optional useCapture parameter to demonstrate the difference between bubbling and capturing:
Using the removeEventListener() method to remove an event handler that has been attached with the addEventListener() method:
For browsers that don't support the addEventListener() method, you can use the attachEvent() method.
This example demonstrates a cross-browser solution:
HTML DOM Reference: document.addEventListener()