PresentationAvailability

这是 实验性技术
检查 浏览器兼容性表格 在生产中使用这之前。

Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers .

A PresentationAvailability object is associated with available presentation displays and represents the presentation display availability for a presentation request. If the controlling user agent can monitor the list of available presentation displays in the background (without a pending request to start() ), the PresentationAvailability object MUST be implemented in a controlling browsing context .

value attribute MUST return the last value it was set to. The value is updated by the monitor the list of available presentation displays algorithm.

onchange attribute is an event handler whose corresponding event handler event type is change .

特性

PresentationAvailability.value 只读
A boolean value indicating whether the given presentation display is available. The value attribute MUST return the last value it was set to.

事件处理程序

PresentationAvailability.onchange
Indicates that the availability of the presentation display has changed.

方法

None.

规范

规范 状态 Comment
Presentation API
The definition of 'PresentationAvailability interface' in that specification.
候选推荐 初始定义。

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
PresentationAvailability
Chrome 48 Edge ≤79 Firefox 51
Disabled
51
Disabled
Disabled From version 51: this feature is behind the dom.presentation.controller.enabled preference (needs to be set to true ). To change preferences in Firefox, visit about:config.
IE No Opera Yes Safari ? WebView Android No Chrome Android 48 Firefox Android 51
Disabled
51
Disabled
Disabled From version 51: this feature is behind the dom.presentation.controller.enabled preference (needs to be set to true ). To change preferences in Firefox, visit about:config.
Opera Android Yes Safari iOS ? Samsung Internet Android 5.0
onchange
Chrome 48 Edge ≤79 Firefox 51
Disabled
51
Disabled
Disabled From version 51: this feature is behind the dom.presentation.controller.enabled preference (needs to be set to true ). To change preferences in Firefox, visit about:config.
IE No Opera Yes Safari ? WebView Android No Chrome Android 48 Firefox Android 51
Disabled
51
Disabled
Disabled From version 51: this feature is behind the dom.presentation.controller.enabled preference (needs to be set to true ). To change preferences in Firefox, visit about:config.
Opera Android Yes Safari iOS ? Samsung Internet Android 5.0
value
Chrome 48 Edge ≤79 Firefox 51
Disabled
51
Disabled
Disabled From version 51: this feature is behind the dom.presentation.controller.enabled preference (needs to be set to true ). To change preferences in Firefox, visit about:config.
IE No Opera Yes Safari ? WebView Android No Chrome Android 48 Firefox Android 51
Disabled
51
Disabled
Disabled From version 51: this feature is behind the dom.presentation.controller.enabled preference (needs to be set to true ). To change preferences in Firefox, visit about:config.
Opera Android Yes Safari iOS ? Samsung Internet Android 5.0

图例

完整支持
完整支持
不支持
不支持
兼容性未知
兼容性未知
实验。期望将来行为有所改变。
实验。期望将来行为有所改变。
用户必须明确启用此特征。
用户必须明确启用此特征。