The getSupportedConstraints
()
method of the MediaDevices
interface returns an object based on the MediaTrackSupportedConstraints
dictionary, whose member fields each specify one of the constrainable properties the user agent understands.
Syntax
var supportedConstraints = navigator.mediaDevices.getSupportedConstraints();
Parameters
None.
Return value
A new object based on the MediaTrackSupportedConstraints
dictionary listing the constraints supported by the user agent. Because only constraints supported by the user agent are included in the list, each of these Boolean properties has the value true
.
Example
This example outputs a list of the constraints supported by your browser.
HTML content
<p>The following media constraints are supported by your browser:</p> <ul id="constraintList"> </ul>
CSS content
body { font: 15px Arial, sans-serif; }
JavaScript content
let constraintList = document.getElementById("constraintList"); let supportedConstraints = navigator.mediaDevices.getSupportedConstraints(); for (let constraint in supportedConstraints) { if (supportedConstraints.hasOwnProperty(constraint)) { let elem = document.createElement("li"); elem.innerHTML = "<code>" + constraint + "</code>"; constraintList.appendChild(elem); } }
Result
Specifications
Specification | Status | Comment |
---|---|---|
Media Capture and Streams The definition of 'getSupportedConstraints()' in that specification. |
Editor's Draft | Initial definition. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Microsoft Edge | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | (Yes) | 50 (50) | ? | ? | ? | ? |
Feature | Android | Android Webview | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|
Basic support | ? | 48.0 (48) | 50.0 (50) | ? | ? | ? | (Yes) |