当窗体的活动标签变化时触发。请注意事件触发时标签的 URL 可能尚未设置,但是你可以通过监听
tabs.onUpdated
事件在 URL 被设置后得到通知。语法
browser.tabs.onActivated.addListener(listener)
browser.tabs.onActivated.removeListener(listener)
browser.tabs.onActivated.hasListener(listener)
此事件有三个方法:
addListener(callback)
- 向此事件添加一个监听。
removeListener(listener)
- 停止监听此事件。
listener
参数是将要移除的监听。 hasListener(listener)
- 检查
listener
是否在此事件中注册。如果正在监听返回true
,否则false。
addListener 语法
参数
callback
-
事件发生时被执行的方法。以下参数会被传递至该方法:
activeInfo
object
. 被激活标签的ID , 以及它的窗体的 ID 。
额外的对象
activeInfo
tabId
integer
. 被激活的标签的ID。windowId
integer
. 此标签的窗体的ID。
浏览器兼容性
BCD tables only load in the browser
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
示例
监听并记录标签激活事件:
function handleActivated(activeInfo) {
console.log("Tab " + activeInfo.tabId +
" was activated");
}
browser.tabs.onActivated.addListener(handleActivated);
Example extensions
Acknowledgements
This API is based on Chromium's chrome.tabs
API. This documentation is derived from tabs.json
in the Chromium code.
Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.
// Copyright 2015 The Chromium Authors. All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.