The GlobalEventHandlers
event handler onpointerdown
is used to specify the event handler for the pointerdown
event, which is fired when the pointing device is initially pressed. This event can be sent to Window
, Document
, and Element
objects.
This is functionally equivalent to the mousedown
event when generated due to user activity with a mouse or mouse-compatible device. If the pointerdown
event isn't canceled through a call to preventDefault()
, most user agents will fire a mousedown
event, so that sites not using pointer events will work.
You can also use addEventListener()
to add a listener for pointerdown
events.
Syntax
target.onpointerdown = downHandler; var downHandler = target.onpointerdown;
Value
A Function
to handle the pointerdown
event for the target
Element
, Document
, or Window
. It receives as input the PointerEvent
describing the pointerdown
event.
Example
This example demonstrates how to watch for and act upon pointerdown
events using onpointerdown
. You could also use addEventListener()
, of course.
JavaScript
First, let's look at the JavaScript code that handles the pointerdown
event.
var targetBox = document.getElementById("target");
targetBox.onpointerdown = handleDown;
function handleDown(evt) {
var action;
switch(evt.pointerType) {
case "mouse":
action = "clicking";
break;
case "pen":
action = "tapping";
break;
case "touch":
action = "touching";
break;
default:
action = "interacting with";
break;
}
targetBox.innerHTML = "<strong>Thanks for " + action + " me!</strong>";
evt.preventDefault();
}
This simply uses onpointerdown
to establish the function handleDown()
as the event handler for pointer down events.
The handleDown()
function, in turn, looks at the value of pointerType
to determine what kind of pointing device was used, then uses that information to customize a string to replace the contents of the target box.
Then the event's preventDefault()
method is called to ensure that the mousedown
event isn't triggered, potentially causing events to be handled twice if we had a handler for those events in case Pointer Event support is missing.
We also have a handler for pointerup
events:
targetBox.onpointerup = handleUp;
function handleUp(evt) {
targetBox.innerHTML = "Tap me, click me, or touch me!";
evt.preventDefault();
}
This code's job is to just restore the original text into the target box after the user's interaction with the element ends (for example, when they release the mouse button, or when they lift the stylus or finger from the screen).
In addition, the event's preventDefault()
method is called to ensure that the mouseup
event isn't triggered unnecessarily.
HTML
The HTML is extremely simple:
<div id="target">
Tap me, click me, or touch me!
</div>
CSS
The CSS simply sets up the appearance of the target, and doesn't affect its functionality at all.
#target {
width: 400px;
height: 30px;
text-align: center;
font: 16px "Open Sans", "Helvetica", sans-serif;
color: white;
background-color: blue;
border: 2px solid darkblue;
cursor: pointer;
user-select: none;
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
Result
The resulting output is shown below. Try tapping, clicking, or touching the box and see what happens. For full effect, try it with a variety of pointer types.
Specifications
Specification | Status | Comment |
---|---|---|
Pointer Events – Level 2The definition of 'onpointerdown' in that specification. | Recommendation | Non-stable version |
Pointer EventsThe definition of 'onpointerdown' in that specification. | Obsolete | Initial definition |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
onpointerdown
|
Chrome
Full support 55 |
Edge Full support 12 Full support 12 No support 12 — 79 Alternate Name' Uses the non-standard name: |
Firefox Full support 59 Full support 59 Full support 29 Disabled' From version 29: this feature is behind the |
IE Full support 11 Full support 11 Full support 10 Alternate Name' Uses the non-standard name: |
Opera
? |
Safari
No support No |
WebView Android
Full support 55 |
Chrome Android
Full support 55 |
Firefox Android Full support 29 Full support 29 Disabled' From version 29: this feature is behind the |
Opera Android
? |
Safari iOS
No support No |
Samsung Internet Android
Full support 6.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- User must explicitly enable this feature.'
- User must explicitly enable this feature.
- Uses a non-standard name.'
- Uses a non-standard name.
See also
- Pointer events
- Using Pointer Events
- Coordinate systems
Document: pointerdown
eventHTMLElement: pointerdown
event
GlobalEventHandlers.onpointerdown by Mozilla Contributors is licensed under CC-BY-SA 2.5.