bra*_*ert 97 javascript google-chrome-extension
我正在尝试从弹出窗口中访问activeTab DOM内容.这是我的清单:
{
"manifest_version": 2,
"name": "Test",
"description": "Test script",
"version": "0.1",
"permissions": [
"activeTab",
"https://api.domain.com/"
],
"background": {
"scripts": ["background.js"],
"persistent": false
},
"content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
"browser_action": {
"default_icon": "icon.png",
"default_title": "Chrome Extension test",
"default_popup": "index.html"
}
}
我真的很困惑后台脚本(具有持久性的事件页面:false)或content_scripts是否可行.我已经阅读了所有文档和其他SO帖子,但对我来说仍然没有意义.
有人可以解释为什么我可以使用一个而不是另一个.
这是我一直在尝试的background.js:
chrome.extension.onMessage.addListener(
function(request, sender, sendResponse) {
// LOG THE CONTENTS HERE
console.log(request.content);
}
);
我只是从弹出控制台执行此操作:
chrome.tabs.getSelected(null, function(tab) {
chrome.tabs.sendMessage(tab.id, { }, function(response) {
console.log(response);
});
});
我越来越:
Port: Could not establish connection. Receiving end does not exist.
更新:
{
"manifest_version": 2,
"name": "test",
"description": "test",
"version": "0.1",
"permissions": [
"tabs",
"activeTab",
"https://api.domain.com/"
],
"content_scripts": [
{
"matches": ["<all_urls>"],
"js": ["content.js"]
}
],
"content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
"browser_action": {
"default_icon": "icon.png",
"default_title": "Test",
"default_popup": "index.html"
}
}
content.js
chrome.extension.onMessage.addListener(
function(request, sender, sendResponse) {
if (request.text && (request.text == "getDOM")) {
sendResponse({ dom: document.body.innertHTML });
}
}
);
popup.html
chrome.tabs.getSelected(null, function(tab) {
chrome.tabs.sendMessage(tab.id, { action: "getDOM" }, function(response) {
console.log(response);
});
});
当我运行它时,我仍然得到同样的错误:
undefined
Port: Could not establish connection. Receiving end does not exist. lastError:30
undefined
gka*_*pak 153
术语"背景页面","弹出窗口","内容脚本"仍然让您感到困惑; 我强烈建议您更深入地了解Google Chrome扩展程序文档.
关于你的问题,如果内容脚本或背景页面是要走的路:
内容脚本:绝对
内容脚本是可以访问网页DOM的扩展的唯一组件.
背景页面/弹出:可能(可能最多只有两个)
您可能需要让内容脚本将DOM内容传递给后台页面或弹出窗口以供进一步处理.
让我再说一遍,我强烈建议对可用文档进行更仔细的研究!
也就是说,这是一个示例扩展,它检索StackOverflow页面上的DOM内容并将其发送到后台页面,后台又在控制台中打印它:
background.js:
// Regex-pattern to check URLs against.
// It matches URLs like: http[s]://[...]stackoverflow.com[...]
var urlRegex = /^https?:\/\/(?:[^./?#]+\.)?stackoverflow\.com/;
// A function to use as callback
function doStuffWithDom(domContent) {
console.log('I received the following DOM content:\n' + domContent);
}
// When the browser-action button is clicked...
chrome.browserAction.onClicked.addListener(function (tab) {
// ...check the URL of the active tab against our pattern and...
if (urlRegex.test(tab.url)) {
// ...if it matches, send a message specifying a callback too
chrome.tabs.sendMessage(tab.id, {text: 'report_back'}, doStuffWithDom);
}
});
content.js:
// Listen for messages
chrome.runtime.onMessage.addListener(function (msg, sender, sendResponse) {
// If the received message has the expected format...
if (msg.text === 'report_back') {
// Call the specified callback, passing
// the web-page's DOM content as argument
sendResponse(document.all[0].outerHTML);
}
});
manifest.json的:
{
"manifest_version": 2,
"name": "Test Extension",
"version": "0.0",
...
"background": {
"persistent": false,
"scripts": ["background.js"]
},
"content_scripts": [{
"matches": ["*://*.stackoverflow.com/*"],
"js": ["content.js"]
}],
"browser_action": {
"default_title": "Test Extension"
},
"permissions": ["activeTab"]
}
Osk*_*kar 61
您不必使用消息传递来获取或修改DOM.我chrome.tabs.executeScript改用了.在我的示例中,我仅使用activeTab权限,因此脚本仅在活动选项卡上执行.
manifest.json的一部分
"browser_action": {
"default_title": "Test",
"default_popup": "index.html"
},
"permissions": [
"activeTab",
"<all_urls>"
]
的index.html
<!DOCTYPE html>
<html>
<head></head>
<body>
<button id="test">TEST!</button>
<script src="test.js"></script>
</body>
</html>
test.js
document.getElementById("test").addEventListener('click', () => {
console.log("Popup DOM fully loaded and parsed");
function modifyDOM() {
//You can play with your DOM here or check URL against your regex
console.log('Tab script:');
console.log(document.body);
return document.body.innerHTML;
}
//We have permission to access the activeTab, so we can call chrome.tabs.executeScript:
chrome.tabs.executeScript({
code: '(' + modifyDOM + ')();' //argument here is a string but function.toString() returns function's code
}, (results) => {
//Here we have just the innerHTML and not DOM structure
console.log('Popup script:')
console.log(results[0]);
});
});
对于那些尝试gkalpak答案但没有效果的人，
请注意，只有在chrome启动过程中启用了扩展程序后，chrome才会将内容脚本添加到所需的页面，并且最好在进行这些更改后重新启动浏览器
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