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ConstrainLong

The ConstrainLong type is used to specify a constraint for a property whose value is an integral number. It extends the LongRange dictionary (which provides the ability to specify a permitted range of property values) to also support an exact value and/or an ideal value the property should take on. In addition, you can specify the value as a simple long integer value, in which case the user agent does its best to match the value once all other more stringent constraints are met.

Properties

If the value of a ConstrainLong is an object rather than a number, it may have the properties below in addition to the properties it inherits from LongRange.

exact
An integer specifying precise, required, value the property must have to be considered acceptable.
ideal
An integer specifying a value the property would ideally have, but which can be considered optional if necessary to find a match.

Specifications

Specification Status Comment
Media Capture and Streams
The definition of 'ConstrainLong' in that specification.
Candidate Recommendation Initial definition

Technically, ConstrainLong is actually based on an intermediary dictionary named ConstrainLongRange, which adds exact and ideal to LongRange, with ConstrainLong being a type that can be either a long integer or a LongRange. However, for the sake of documentation clarity, the intermediate type (present only because of quirks in WebIDL syntax) is ignored here.

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support Yes ? 50 No Yes ?
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support Yes Yes ? 50 Yes ? ?

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/ConstrainLong