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
<p>The following media constraints are supported by your browser:</p>
<ul id="constraintList">
</ul>
CSS
body {
font: 15px Arial, sans-serif;
}
JavaScript
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. |
Candidate Recommendation | Initial definition. |
Browser compatibility
BCD tables only load in the browser