我正在尝试使用chrome扩展程序从科学网获取一些数据。第一步,我想创建一个新的选项卡并等待它加载。因此,在创建标签后,我添加了一个webNavigation侦听器。我发现听众效果很好 仅适用于某些网站。如果我将目标网址(科学网络)用作以下代码,则不会收到警报窗口。但是,如果我使用目标“ https://stackoverflow.com/questions/ask”,它将成功发出警报。为什么会这样?谁能告诉我原因?真的很感谢。
background.js
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
var activeTab = tabs[0];
tabId = activeTab.id;
chrome.tabs.sendMessage(tabId, {"message": "clicked_browser_action"});
});
});
var link = 'https://apps.webofknowledge.com/OneClickSearch.do?product=UA&search_mode=OneClickSearch&excludeEventConfig=ExcludeIfFromFullRecPage&SID=7ENVgUT3nRKp41VVlhe&field=AU&value=Leroux,%20E.'; // failed in this url
//var link = 'https://stackoverflow.com/questions/ask'; //success in this url
function listener1(){
chrome.webNavigation.onCompleted.removeListener(listener1);
chrome.tabs.sendMessage(tabId, {"message": "to content"});
alert('listener succeed');
}
chrome.runtime.onMessage.addListener(
function(request, sender, sendResponse) {
if (request.joke == 'content initial'){
chrome.tabs.create({ url: link });
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
var activeTab = tabs[0];
tabId = activeTab.id;
});
//alert(link);
chrome.webNavigation.onCompleted.addListener(listener1, {url: [{urlMatches : link}]});
}
}
)
content.js
chrome.runtime.onMessage.addListener(
function(request, sender, sendResponse) {
if( request.message === "clicked_browser_action" ) {
console.log('content initial');
chrome.runtime.sendMessage({joke: 'content initial'}, function(response) {
});
}
}
)
manifest.json
{
"manifest_version": 2,
"name": "citation",
"version": "1",
"background": {
"scripts": ["background.js"],
"persistent": false
},
"browser_action": {},
"content_scripts": [{
"matches": ["<all_urls>"],
"run_at": "document_idle",
"js": ["content.js"]
}],
"permissions": [
"downloads",
"webNavigation",
"tabs",
"<all_urls>"
]
}
答案 0 :(得分:1)
主要问题是urlMatches
是RE2语法中的正则表达式,正如您在documentation中看到的那样,因此URL中的各种特殊符号(如?
)的解释不同。解决方案:使用urlEquals
或其他文字字符串比较。
还有其他问题:
#hash
部分的URL解决方案:记住要在变量中监视的标签ID,并在侦听器中进行比较,然后在过滤器中明确剥离#hash部分。chrome.browserAction.onClicked.addListener(tab => {
chrome.tabs.sendMessage(tab.id, {message: 'clicked_browser_action'});
});
var link = '...............';
chrome.runtime.onMessage.addListener((msg, sender, sendResponse) => {
if (msg.joke === 'content initial') {
chrome.tabs.create({url: link}, tab => {
chrome.webNavigation.onCompleted.addListener(function onCompleted(info) {
if (info.tabId === tab.id && info.frameId === 0) {
chrome.webNavigation.onCompleted.removeListener(onCompleted);
chrome.tabs.sendMessage(tab.id, {message: 'to content'});
console.log('listener succeeded');
}
}, {
url: [{urlPrefix: new URL(link).origin + '/'}],
});
});
}
});
注意:
content_scripts
。在这种情况下,请使用programmatic injection。console.log()
之类的devtools中,而不是alert()使用适当的调试。