This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The Touch.force
read-only property returns the amount of pressure the user is applying to the touch surface for a Touch
point.
Syntax
touchItem.force;
Return value
A float
that represents the amount of pressure the user is applying to the touch surface. This is a value between 0.0
(no pressure) and 1.0
(the maximum amount of pressure the hardware can recognize). A value of 0.0
is returned if no value is known (for example the touch device does not support this property). In environments where force is known, the absolute pressure represented by the force attribute, and the sensitivity in levels of pressure, may vary.
Example
This example illustrates using the Touch
interface's Touch.force
property. This property is a relative value of pressure applied, in the range 0.0
to 1.0
, where 0.0
is no pressure, and 1.0
is the highest level of pressure the touch device is capable of sensing.
In following code snippet, the touchstart
event handler iterrates through the targetTouches
list and logs the force
value of each touch point but the code could invoke different processing depending on the value.
someElement.addEventListener('touchstart', function(e) { // Iterate through the list of touch points and log each touch // point's force. for (var i=0; i < e.targetTouches.length; i++) { // Add code to "switch" based on the force value. For example // minimum pressure vs. maximum pressure could result in // different handling of the user's input. console.log("targetTouches[" + i + "].force = " + e.targetTouches[i].force); } }, false);
Specifications
Specification | Status | Comment |
---|---|---|
Touch Events – Level 2 | Draft | Initial definition. |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
force | Chrome Full support Yes | Edge Full support ≤79 | Firefox Full support Yes | IE No support No | Opera Full support Yes | Safari No support No | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support Yes | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.