Chrome扩展插件开发

开发了一个简单的谷歌浏览器小插件 --- 百度精简搜索

先来看下插件效果图：

插件功能很简单 就是在网页里实现划词来进行直接百度搜索，过程如下：

项目文件结构如下：

Chrome扩展插件是依赖于manifest.json文件和若干html、js、png组成，其中manifest.js是必须的，由于我们开发的这个插件没有设置窗口或是popup窗口

之类的页面所以没有html文件。

manifest.json :

{
   "background": {
      "scripts": [ "background.js" ]
   },
   "browser_action": {
      "default_icon": "logo128.png",
      "default_title": "u6253u5F00u767Eu5EA6"
   },
   "content_scripts": [ {
      "js": [ "detector.js" ],
      "matches": [ "http://*/*", "https://*/*" ]
   } ],
   "content_security_policy": "script-src "self" "unsafe-eval" https://ssl.google-analytics.com; object-src "self"",
   "description": "Quick access to Baidu u7CBEu7B80u7248uFF0Cu5212u8BCDu53F3u952Eu83DCu5355u5FEBu901Fu641Cu7D22",
   "icons": {
      "128": "logo128.png",
	  "48": "logo48.png",
	  "16": "logo16.png"
   },
   "manifest_version": 2,
   "name": "u767Eu5EA6u7CBEu7B80u641Cu7D22",
   "permissions": [ "contextMenus", "tabs", "http://*/*", "https://*/*", "notifications", "webRequest", "webRequestBlocking" ],
   "update_url": "https://clients2.google.com/service/update2/crx",
   "version": "1.0"
}

background.js:

var win = null,
    text = "",
    search_text = null;
chrome.browserAction.onClicked.addListener(function(tab) {
    chrome.tabs.getSelected(null, function(tab) {
      chrome.tabs.sendMessage(tab.id, {selected: true}, function(response) {
        if (!response) return;
        var search_text = response.data;
        if(search_text.length == 0 && win) {
            chrome.windows.update(win.id, { focused: true });
        } else if(search_text.length > 1) {
            toSearch(search_text);      
        } else {
            toSearch();
        }
      });
      if (tab.url.indexOf("chrome://") == 0) toSearch();
    });        
});

var toSearch = function(_text) {
    text = _text;
	var url = "http://www.baidu.com";
	if(text && !text.status && text != ""){
        url = "http://www.baidu.com/s?wd=" + text;
    }
    chrome.tabs.query( {"active" : true}, function(tabs){ 
            chrome.tabs.create({url:url,index: tabs[0].index + 1});
        })
};

chrome.windows.onRemoved.addListener(function(windowId) {
    if(!win) return;
    if(windowId = win.id)
        win = null;
});

chrome.contextMenus.onClicked.addListener(function clickMenuToSearch(info, tab){
    selectedText = info.selectionText;
    if(selectedText.length == 0 && win) {
        chrome.windows.update(win.id, { focused: true });
    } else if(selectedText.length > 0) {
        toSearch(selectedText);      
    } else {
        toSearch();
    }
});

chrome.contextMenus.create({"title": "用 Baidu 搜索  "%s"", "contexts": ["selection"], "id": "用 Baidu 搜索  "%s""});

detector.js:

var detector = {
	addListen: function() {
		chrome.extension.onMessage.addListener(
			function(request, sender, sendResponse) {
				var selected = detector.getSelectedText();

			    if (request.selected) {
			    	sendResponse({data: selected});
			    } 
		});
	},
	getSelectedText: function() {
		var txt = "nothing";
	    if (window.getSelection){
	        txt = window.getSelection().toString();
	    } else if (document.getSelection) {
	        txt = document.getSelection().toString();
	    } else if (document.selection) {
	        txt = document.selection.createRange().text;
	    } 
	    return txt;
	}
};

detector.addListen();

开发好代码后就可以到Chrome浏览器的扩展程序页面，开启开发者模式来进行调试以及打包生成crx文件进行安装。

点击下载打包好的baidu.crx文件