Browser Actions

用 browser actions 可以在chrome主工具条的地址栏右侧增加一个图标。作为这个图标的延展，一个browser action图标还可以有tooltip、badge和popup。

如下图, 地址栏右侧的彩色正方形是一个browser action的图标， 图标下面的是popup。

如果你想创建一个不总是可见的图标, 可以使用page action来代替browser action.

注意:Packaged apps 不能使用browser actions.

Manifest

在extension manifest中用下面的方式注册你的browser action:

{
  "name": "My extension",
  ...
  "browser_action": {
    "default_icon": "images/icon19.png", // optional 
    "default_title": "Google Mail",      // optional; shown in tooltip 
    "default_popup": "popup.html"        // optional 
  },
  ...
}

UI的组成部分

一个 browser action 可以拥有一个图标，一个tooltip，一个badge和一个popup。

图标

Browser action 图标推荐使用宽高都为19像素，更大的图标会被缩小。

你可以用两种方式来设置图标: 使用一个静态图片或者使用HTML5canvas element。 使用静态图片适用于简单的应用程序，你也可以创建诸如平滑的动画之类更丰富的动态UI(如canvas element)。

静态图片可以是任意WebKit支持的格式，包括 BMP，GIF，ICO，JPEG或 PNG。

修改browser_action的manifest中 default_icon字段，或者调用setIcon()方法。

ToolTip

修改browser_action的manifest中default_title字段，或者调用setTitle()方法。你可以为default_title字段指定本地化的字符串；点击Internationalization查看详情。

Badge

Browser actions可以选择性的显示一个badge— 在图标上显示一些文本。Badges 可以很简单的为browser action更新一些小的扩展状态提示信息。

因为badge空间有限，所以只支持4个以下的字符。

设置badge文字和颜色可以分别使用setBadgeText()andsetBadgeBackgroundColor()。

Popup

如果browser action拥有一个popup，popup 会在用户点击图标后出现。popup 可以包含任意你想要的HTML内容，并且会自适应大小。

在你的browser action中添加一个popup，创建弹出的内容的HTML文件。 修改browser_action的manifest中default_popup字段来指定HTML文件， 或者调用setPopup()方法。

Tips

为了获得最佳的显示效果, 请遵循以下原则：

  • 确认 Browser actions 只使用在大多数网站都有功能需求的场景下。
  • 确认 Browser actions 没有使用在少数网页才有功能的场景， 此场景请使用page actions。
  • 确认你的图标尺寸尽量占满19x19的像素空间。 Browser action 的图标应该看起来比page action的图标更大更重。
  • 不要尝试模仿Google Chrome的扳手图标，在不同的themes下它们的表现可能出现问题,，并且扩展应该醒目些。
  • 尽量使用alpha通道并且柔滑你的图标边缘，因为很多用户使用themes，你的图标应该在在各种背景下都表现不错。
  • 不要不停的闪动你的图标，这很惹人反感。

范例

你可以在 examples/api/browserAction目录找到简单的browser actions范例，更多的范例和帮助文档可以参考Samples。

API说明：chrome.browserAction

方法

setBadgeBackgroundColor

void chrome.browserAction.setBadgeBackgroundColor(, object details)

设置badge的背景颜色。

Parameters

details
( Type array of object )
Undocumented.
Description of this parameter from the json schema.
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
color
( Type array of Type array of integer paramType )
范围为[0,255]整数构成的结构，用来描述badge的RGBA颜色。例如：不透明的红色是[255, 0, 0, 255]。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
tabId
( optional Type array of integer )
可选参数，将设置限制在被选中的标签，当标签关闭时重置。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.

Returns

Callback function

The callback parameter should specify a function that looks like this:

If you specify the callback parameter, it should specify a function that looks like this: 

function(Type param1, Type param2) {...};

This function was added in version . If you require this function, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.

setBadgeText

void chrome.browserAction.setBadgeText(, object details)

设置browser action的badge文字，badge 显示在图标上面。

Parameters

details
( Type array of object )
Undocumented.
Description of this parameter from the json schema.
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
text
( Type array of string )
任意长度的字符串，但只有前4个字符会被显示出来。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
tabId
( optional Type array of integer )
可选参数，将设置限制在被选中的标签，当标签关闭时重置。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.

Returns

Callback function

The callback parameter should specify a function that looks like this:

If you specify the callback parameter, it should specify a function that looks like this: 

function(Type param1, Type param2) {...};

This function was added in version . If you require this function, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.

setIcon

void chrome.browserAction.setIcon(, object details)

设置browser action的图标。图标可以是一个图片的路径或者是从一个canvas元素提取的像素信息.。无论是图标路径还是canvas的 imageData，这个属性必须被指定。

Parameters

details
( Type array of object )
Undocumented.
Description of this parameter from the json schema.
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
imageData
( optional Type array of ImageData )
图片的像素信息。必须是一个ImageData 对象(例如：一个canvas元素)。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
path
( optional Type array of string )
图片在扩展中的的相对路径。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
tabId
( optional Type array of integer )
可选参数，将设置限制在被选中的标签，当标签关闭时重置。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.

Returns

Callback function

The callback parameter should specify a function that looks like this:

If you specify the callback parameter, it should specify a function that looks like this: 

function(Type param1, Type param2) {...};

This function was added in version . If you require this function, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.

setPopup

void chrome.browserAction.setPopup(, object details)

设置一个点击browser actions时显示在popup中的HTML。

Parameters

details
( Type array of object )
Undocumented.
Description of this parameter from the json schema.
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
tabId
( optional Type array of integer )
可选参数，将设置限制在被选中的标签，当标签关闭时重置。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
popup
( Type array of string )
popup中显示的html文件。如果设置为空字符('')，将不显示popup。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.

Returns

Callback function

The callback parameter should specify a function that looks like this:

If you specify the callback parameter, it should specify a function that looks like this: 

function(Type param1, Type param2) {...};

这个功能已经在chromium 5.0.316.0版本添加。如果你需要这个功能，可以通过manifest的minimum_chrome_version键值来确认你的扩展不会运行在早期的浏览器版本。

setTitle

void chrome.browserAction.setTitle(, object details)

设置browser action的标题，这个将显示在tooltip中。

Parameters

details
( Type array of object )
Undocumented.
Description of this parameter from the json schema.
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
title
( Type array of string )
鼠标移动到browser action上时显示的文字。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.
tabId
( optional Type array of integer )
可选参数，将设置限制在被选中的标签，当标签关闭时重置。
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.

Returns

Callback function

The callback parameter should specify a function that looks like this:

If you specify the callback parameter, it should specify a function that looks like this: 

function(Type param1, Type param2) {...};

This function was added in version . If you require this function, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.

事件

onClicked

chrome.browserAction.onClicked.addListener(function(Tab tab) {...});

当browser action 图标被点击的时候触发，当browser action是一个popup的时候，这个事件将不会被触发。

Parameters

tab
( Tab array of paramType )
Undocumented.
Description of this parameter from the json schema.
This parameter was added in version . You must omit this parameter in earlier versions, and you may omit it in any version. If you require this parameter, the manifest key minimum_chrome_version can ensure that your extension won't be run in an earlier browser version.