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弹出窗口上有一个按钮。点击后,popup.js将向background.js发送消息。它几乎在所有时间都运行良好。但经过很长时间没有操作铬,当我点击按钮,消息发送(警告(“开始发送消息”)执行),但不能被background.js接收(警报(“开始渲染”))执行)。当我再点击一次时,它有时会起作用。如果它仍然不起作用,我会再次点击,第三次有更多的机会成功。这很奇怪。Chrome扩展程序:背景js偶尔不能接收Popup js的消息
我在popup.html中使用jquery,但我不认为这很重要。 JavaScript代码popup.js
$('#create).html(chrome.i18n.getMessage('create'))
.on('click', function(){
_current = null;
chrome.runtime.sendMessage({
cmd: 'SITEMAP_DEFINE'
});
alert("Start to send message");
window.close();
})
JavaScript代码background.js在您的帮助
var curTabId; //current tab in which scraper is going to scraping
var devtoolPort;
var coord;
var sitemap;
var finish = false;
function sendMessage(msg) {
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
chrome.tabs.sendMessage(tabs[0].id, msg);
});
}
//detective devtools
chrome.runtime.onConnect.addListener(function (port) {
if (port.name == "devtools-papa") {
devtoolPort = port;
}
});
//tab update
chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
if(finish === false && coord && changeInfo.status == 'loading'){
coord.onUpdate(tab);
}
})
chrome.tabs.onRemoved.addListener(function(tabId, removeInfo) {
if(finish === false && coord && removeInfo.isWindowClosing === false){
coord.onRemove(tabId);
}
})
chrome.runtime.onMessage.addListener(function(msg, sender, callback){
var p = msg.params;
//scrape
if(msg.cmd == 'START_SCRAPE'){
sitemap = p.sitemap;
if(sitemap){
finish = false;
coord = new Coordinator(sitemap, 0);
var page = coord.sitemap.pages[0];
coord.openTab(page.id, page.link);
}
}
else if(msg.cmd == 'TEST_SCRAPE'){
sitemap = p.sitemap;
if(sitemap){
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
var tab = tabs[0];
sitemap.pages[0].link = tab.url;
finish = false;
coord = new Coordinator(sitemap, 20);
var page = coord.sitemap.pages[0];
coord.openTab(page.id, page.link);
})
}
}
else if(msg.cmd == 'SCRAPE_READY'){
print(sender);
coord.readyForScrape(sender.tab.id);
}
else if(msg.cmd == 'TAB_CLICK'){
coord.currentPage = sitemap.getPage(p.page);
}
//define
else if(msg.cmd == 'START_SELECT'){
if(msg.tabId){
chrome.tabs.sendMessage(msg.tabId, msg);
}else{
sendMessage(msg);
}
}
else if(msg.cmd == 'END_SELECT'){
if(devtoolPort){
devtoolPort.postMessage(msg);
}
sendMessage(msg);
}
else if(msg.cmd == 'SITEMAP_DEFINE'){
alert("Start to render");
var url = p && p.url;
sitemap = p && p.sitemap;
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
var tab = tabs[0];
if(url && url != tab.url){
chrome.tabs.create({url: url}, function(newTab){
doInjectScript(newTab.id);
})
}else{
injectScript(tab.id);
}
});
}
else if(msg.cmd == 'SITEMAP_DEFINE_END'){
var _sm = p.sitemap;
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
var tab = tabs[0];
_sm.pages[0].link = tab.url;
saveSitemap(_sm);
})
}
else if(msg.cmd == 'SITEMAP_DELETE'){
deleteSitemap(p.sitemap);
}
else if(msg.cmd == 'DEFINE_PAGE_LOADED'){
callback(sitemap);
}
else{
sendMessage(msg);
}
});
var print = function(msg){
if(curTabId){
chrome.tabs.sendMessage(curTabId, {
cmd: 'LOG',
params: msg
});
}else{
sendMessage(msg)
}
}
function saveSitemap(_sm){
var id = _sm.id;
chrome.storage.local.get("sitemaps", function(db){
var _sitemaps = db["sitemaps"];
if(!_sitemaps || !_sitemaps.length){
_sitemaps = [_sm];
}else{
var _idx = _sitemaps.findIndex(function(s){return s.id == id});
if(_idx == -1){
_sitemaps.push(_sm);
}else{
_sitemaps.splice(_idx, 1, _sm);
}
}
var _db = {'sitemaps':_sitemaps}
chrome.storage.local.set(_db, function(){
alert(chrome.i18n.getMessage('saved'));
});
})
}
function deleteSitemap(id){
chrome.storage.local.get("sitemaps", function(db){
var _sitemaps = db["sitemaps"];
var index = _sitemaps.findIndex(function(s){return s.id == id})
_sitemaps.splice(index, 1);
var _db = {'sitemaps':_sitemaps}
chrome.storage.local.set(_db, function(){
alert(chrome.i18n.getMessage('deleted'));
});
})
}
function injectScript(tabId){
var flag;
chrome.tabs.sendMessage(tabId, {
cmd: 'SELF_CHECK'
}, function(r){
flag = r;
});
setTimeout(function(){
if(flag){
chrome.tabs.executeScript(tabId, {file: "injected/define/initUI.js"}, function() {});
}else{
doInjectScript(tabId);
}
}, 200)
}
//Injected scripts will be removed once the tab reload again.
function doInjectScript(tabId){
chrome.tabs.executeScript(tabId, {file: "injected/listener.js"});
chrome.tabs.executeScript(tabId, {file: "lib/jquery/jquery-2.1.1.min.js"}, function() {
chrome.tabs.executeScript(tabId, {file: "lib/model.js"});
chrome.tabs.executeScript(tabId, {file: "lib/css-selector-generator.js"}, function() {});
chrome.tabs.executeScript(tabId, {file: "injected/SelectTool.js"}, function() {});
chrome.tabs.executeScript(tabId, {file: "injected/define/initUI.js"}, function() {});
chrome.tabs.insertCSS(tabId, {file: "injected/injected.css", runAt: "document_end"});
});
}
function createResultTab(title, fields, data){
chrome.tabs.create({url: chrome.extension.getURL('result/table.html')}, function(newTab){
var tabId = newTab.id;
setTimeout(function(){
chrome.tabs.sendMessage(tabId, {
cmd: 'RESULT',
params:{
data: data,
title: title,
fields: fields
}
});
}, 200)
})
}
感谢。
没有看到doInjectScript代码,我的猜测是它没有考虑到执行chrome.tabs.create回调但标签还没有开始加载URL的情况。 – wOxxOm
请将[问题]置于主题上:包括**完整** [mcve],表示重复问题*。包括* manifest.json *,一些背景/内容/弹出脚本/ HTML。寻求调试帮助的问题(“**为什么不是这个代码工作?”)必须包括:►期望的行为,►特定问题或错误*和*►在问题中重现问题所需的最短代码**本身**。没有明确问题陈述的问题对其他读者无益。请参阅:“**如何创建[mcve] **”,[我可以在此处询问哪些主题?](http://stackoverflow.com/help/on-topic)和[问]。 – Makyen
谢谢wOxxOm。我认为你不应该关心doInjectScript代码,因为代码'alert(“Start to render”);''只是在'alert(“开始发送消息”)后才执行;''被执行。 –