将firefox-webextension的按钮更改为textString

时间：2017-01-26 08:34:28

标签： javascript firefox dom firefox-webextensions

目前我在firefox 47上构建了一个webextension。

当您点击webextension按钮时，会出现一个下拉菜单，从那里我可以导航到其他网站。

出现的按钮是我在manifest.json中指定的图标。我想知道是否有办法将扩展图标更改为包含我当前访问的URL的文本字符串，并且每次访问新URL时都会更改。

1 个答案:

答案 0 :(得分：2)

不，您无法直接将浏览器操作或页面操作图标更改为一些长文本。你可以：

  • 的 Browser Actions
  • 的 Page Actions
    • 使用pageAction.setIcon()更改图标。这会更改显示的图像。它将始终与正常的图标大小相同。您可以在图标图像中包含非常有限的文本。但是，动态执行此操作会很复杂，但在有限集之间切换可能不会那么糟糕。
    • 使用pageAction.setTitle()更改图标的标题。这显示为工具提示。该文本的长度本身并不受限制。但是，实际向用户显示的内容存在合理的限制。
    • 从发送事件到您可以使用pageAction.onClicked监听器收听的后台页面，通过提供弹出式网址pageAction.setPopup()来显示HTML弹出窗口。您可以通过将''指定为弹出窗口的URL来更改回点击事件。
    • 使用pageAction.show()和pageAction.hide()显示或隐藏按钮。

更改图标徽章和徽章颜色的示例：

Example of changing the icon badge and badge color

用于创建按钮开/关状态的代码是：

background.js 

//The browserButtonStates Object describes the states the button can be in and the
//  'action' function to be called when the button is clicked when in that state.
//  In this case, we have two states 'on' and 'off'.
//  You could expand this to as many states as you desire.
//icon is a string, or details Object for browserAction.setIcon()
//title must be unique for each state. It is used to track the state.
//  It indicates to the user what will happen when the button is clicked.
//  In other words, it reflects what the _next_ state is, from the user's
//  perspective.
//action is the function to call when the button is clicked in this state.
var browserButtonStates = {
    defaultState: 'off',
    on: {
        //icon         : '/ui/is-on.png'
        badgeText  : 'On',
        badgeColor : 'green',
        title        : 'Turn Off',
        action       : function(tab) {
                           chrome.webNavigation.onCommitted.removeListener(onTabLoad);
                       },
        nextState    : 'off'
    },
    off: {
        //icon         : '/ui/is-off.png'
        badgeText  : 'Off',
        badgeColor : 'red',
        title        : 'Turn On',
        action       : function(tab) {
                           chrome.webNavigation.onCommitted.addListener(onTabLoad);
                       },
        nextState    : 'on'
    }
}

//This moves the Browser Action button between states and executes the action
//  when the button is clicked. With two states, this toggles between them.
chrome.browserAction.onClicked.addListener(function(tab) {
    chrome.browserAction.getTitle({tabId:tab.id},function(title){
        //After checking for errors, the title is used to determine
        //  if this is going to turn On, or Off.
        if(chrome.runtime.lastError){
            console.log('browserAction:getTitle: Encountered an error: ' 
                + chrome.runtime.lastError);
            return;
        }
        //Check to see if the current button title matches a button state
        let newState = browserButtonStates.defaultState;
        Object.keys(browserButtonStates).some(key=> {
            if(key === 'defaultState') {
                return false;
            }
            let state = browserButtonStates[key];
            if(title === state.title) {
                newState = state.nextState;
                setBrowserActionButton(browserButtonStates[newState]);
                if(typeof state.action === 'function') {
                    //Do the action of the matching state
                    state.action(tab);
                }
                //Stop looking
                return true;
            }
        });
        setBrowserActionButton(browserButtonStates[newState]);
    });
});

function setBrowserActionButton(tabId,details){
    if(typeof tabId === 'object' && tabId !== null){
        //If the tabId parameter is an object, then no tabId was passed.
        details = tabId;
        tabId       = null;
    }
    let icon   = details.icon;
    let title  = details.title;
    let text   = details.badgeText;
    let color  = details.badgeColor;

    //Supplying a tabId is optional. If not provided, changes are to all tabs.
    let tabIdObject = {};
    if(tabId !== null && typeof tabId !== 'undefined'){
        tabIdObject.tabId = tabId;
    }
    if(typeof icon === 'string'){
        //Assume a string is the path to a file
        //  If not a string, then it needs to be a full Object as is to be passed to
        //  setIcon().
        icon = {path:icon};
    }
    if(icon) {
        Object.assign(icon,tabIdObject);
        chrome.browserAction.setIcon(icon);
    }
    if(title) {
        let detailsObject = {title};
        Object.assign(detailsObject,tabIdObject);
        chrome.browserAction.setTitle(detailsObject);
    }
    if(text) {
        let detailsObject = {text};
        Object.assign(detailsObject,tabIdObject);
        chrome.browserAction.setBadgeText(detailsObject);
    }
    if(color) {
        let detailsObject = {color};
        Object.assign(detailsObject,tabIdObject);
        chrome.browserAction.setBadgeBackgroundColor(detailsObject);
    }
}

//Set the starting button state to the default state
setBrowserActionButton(browserButtonStates[browserButtonStates.defaultState]);

的manifest.json ：

{
    "description": "Demo Button toggle",
    "manifest_version": 2,
    "name": "Demo Button toggle",
    "version": "0.1",

    "background": {
        "scripts": [
            "background.js"
        ]
    },

    "browser_action": {
        "default_icon": {
            "32": "myIcon.png"
        },
        "default_title": "Turn On",
        "browser_style": true
    }
}

此答案中的代码最初发布在我对In a Firefox WebExtension, how I can make a button that looks and acts like a toggle的回答中。

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