如何使用Chrome扩展从活动选项卡中获取段落? [英] How to get a paragraph from the active tab with chrome extension?
问题描述
在 background.html
中,我得到了 id
, url
和 title
这样的当前标签:
chrome.tabs.getSelected(null,function(tab){
tabId = tab.id;
tabUrl = tab.url
tabTitle = tab.title
...
我还需要获取当前选项卡的第一段。这是可能的吗?我没有看到标签类型中的任何相关内容。谢谢
更新
这是 dom.js
:
chrome.extension.onRequest.addListener(function(request,sender,sendResponse){
if(request.action ==getDOM)
// sendResponse({dom:你想得到的dommmmm});
sendResponse({dom:document.getElementsByTagName(body)[0]});
// sendResponse({dom:document.getElementsByTagName(p)});
else
sendResponse({}); //不发送任何内容..
});
这就是我在 background.html
:
//向内容脚本发送请求。
chrome.tabs.sendRequest(tab.id,{action:getDOM},function(response){
console.log(response.dom);
});
但似乎没有任何事情发生。我甚至不知道在哪里寻找。
更新
manifest.json:
{
name:My First Extension,
version:1.0,
description:我做的第一个扩展名,
background_page:background.html,
content_scripts:[
{
matches: [http:// * / *],
js:[dom.js]
}
],
browser_action:{
default_icon:icon.png
},
权限:[
标签,
http://ting-1.appspot.com/ submithandlertest
}
更新
插入console.logs进行调试,但在控制台中没有看到它们;事实上dom.js甚至没有运行,我把else拼写成els,没有给出错误。但是否则扩展运行良好并执行xhr请求。我做错了什么?
dom.js
chrome.extension.onRequest.addListener(function(request,sender,sendResponse){
if(request.action ==getDOM)
console.log(dom.js - 请求操作)
sendResponse({dom:document.getElementsByTagName(body)[0]});
console.log(*** dom.js - sendResponse ***)
else
sendResponse({}); //不发送..
console.log(*** dom.js - else ***)
});
background.html
< html>
< script>
chrome.browserAction.onClicked.addListener(function(tab){
chrome.tabs.getSelected(null,function(tab){
//发送请求到内容脚本。
chrome.tabs.sendRequest(tab.id,{action:getDOM},function(response){
console.log(response.dom);
console.log background - where response.dom)
});
tabId = tab.id;
console.log(tabId)
tabUrl = tab。 url
console.log(tabUrl)
tabTitle = tab.title
console.log(tabTitle)
var formData = new FormData();
formData.append(url,tabUrl);
formData.append(title,tabTitle);
formData.append(pitch,this is a note);
//formData.append(\"user_tag_list,tag1,tag2);
var xhr = new XMLHttpRequest();
xhr.open(POST, http://ting-1.appspot.com/submithandlertest,true);
xhr.onreadystatechange = function(aEvt){
if(xhr.readyState == 4){
if (xhr.status == 200){
console.log(request 200-OK);
chrome.browserAction.setBadgeText({text:done});
setTimeout(function(){
chrome.browserAction.setBadgeText({text:});
},2000);
} else {
console.log(connection error);
chrome.browserAction.setBadgeText({text:ERR});
}
}
};
xhr.send(formData);
console.log(tabUrl:+ tabUrl)
console.log(formData)
});
});
< / script>
< / html>
编辑
<按照serg的建议编辑 background.html
将所有需要它的代码包装到 chrome.tabs.sendRequest
回调(所有这些xhrs)。但是这个版本的背景不起作用。我没有收到任何错误消息,但没有任何反应。我做错了什么?
< html>
< script>
chrome.browserAction.onClicked.addListener(function(tab)
{
//chrome.tabs.getSelected(null,function(tab)
// {
//向内容脚本发送请求
chrome.tabs.sendRequest(tab.id,{action:getDOM},function(response)
{
console.log(response .dom);
console.log(background - where response.dom)
//});将其移至包含xhr
tabId = tab.id;
console.log(tabId)
tabUrl = tab.url
console.log(tabUrl)
tabTitle = tab.title
console.log(tabTitle)
var formData = new FormData();
formData.append(url,tabUrl);
formData.append(title,tabTitle);
formData.append() 音调,这是一个音符);
//formData.append(user_tag_list,tag1,tag2);
// xhr *************************************** ******************************************
var xhr = new的XMLHttpRequest();
xhr.open(POST,http://ting-1.appspot.com/submithandlertest,true);
xhr.onreadystatechange = function(aEvt)
{
if(xhr.readyState == 4)
{
if(xhr.status == 200)
{
console.log(request 200-OK);
chrome.browserAction.setBadgeText({text:done});
setTimeout(function()
{
chrome.browserAction.setBadgeText({text:});
},2000);
}
else
{
console.log(connection error);
chrome.browserAction.setBadgeText({text:ERR});
}
}
};
xhr.send(formData);
console.log(tabUrl:+ tabUrl)
console.log(formData)
// xhr ****************** ************************************************** **************
}); //chrome.tabs.sendRequest
});
< / script>
< / html>
更新:已编辑dom.js:
chrome.extension.onRequest.addListener
(
函数(request,sender,sendResponse)
{
if(request.action ==getDOM)
{
console.log(dom.js - if(request.action == getDom))
// sendResponse({dom :你想得到的dommmmm});
// sendResponse({dom:document.getElementsByTagName(body)[0]});
sendResponse({dom :document.getElementsByTagName(p)[0]});
console.log(*** dom.js - sendResponse ***)
// var pageInfo = {
//title:document.title};
//chrome.extension.sendRequest(pageInfo);
}
else
{
sendResponse({} ); //不发送。
console.log(*** dom.js - else ***)
}
}
);
使用 console.log更新最新background.html
s显示已标记:
< html>
< script>
chrome.browserAction.onClicked.addListener(function(tab){
chrome.tabs.getSelected(null,function(tab){
//发送请求到内容脚本。
chrome.tabs.sendRequest(tab.id,{action:getDOM},function(response){
// NOT SHOWING
console.log(response.dom)
//不显示
console.log(background - where response.dom)
});
tabId = tab.id;
//显示
console.log(tabId)
tabUrl = tab.url
//显示
console.log(tabUrl)
//显示
tabTitle = tab.title
// SHOWING
console.log(tabTitle)
var formData = new FormData();
formData.append(url ,tabUrl);
formData.append(title,tabTitle);
formData.append(pitch,this is a note);
//formData.append( user_tag_list,tag1,tag2);
var xhr = new XMLHttpRequest();
xhr.open(POST,http://ting-1.appspot.com / submithandlertest,true);
xhr.onreadystatechange = function(aEvt){
if(xhr.readyState == 4){
if(xhr.status == 200){
// SHOWING
console。日志(请求200-OK);
chrome.browserAction.setBadgeText({text:done});
setTimeout(function(){
chrome.browserAction.setBadgeText({text:});
},2000);
} else {
//不显示
console.log(连接错误);
chrome.browserAction.setBadgeText({text:ERR});
}
}
};
xhr.send(formData);
// SHOWING
console.log(tabUrl:+ tabUrl)
// SHOWING
console.log(formData)
});
});
< / script>
< / html>
你不能从背景页面,但是您可以向所有页面注入内容脚本,并使用消息传递将此信息传回后台页面。
In my background.html
I am getting the id
, url
, and title
of the current tab like this:
chrome.tabs.getSelected(null, function(tab) {
tabId = tab.id;
tabUrl = tab.url
tabTitle = tab.title
...
I also need to get the first paragraph of the current tab. Is this possible? I don't see anything related in the tab type. Thanks
Update
Update in response to serg's answer and copying the code from here:
This is dom.js
:
chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
if (request.action == "getDOM")
//sendResponse({dom: "The dommmmm that you want to get"});
sendResponse({dom: document.getElementsByTagName("body")[0]});
//sendResponse({dom: document.getElementsByTagName("p")});
else
sendResponse({}); // Send nothing..
});
and this is what I have in background.html
:
// Send a request to the content script.
chrome.tabs.sendRequest(tab.id, {action: "getDOM"}, function(response) {
console.log(response.dom);
});
But nothing seems to be happenning. I don't even know where to look.
Update
manifest.json:
{
"name": "My First Extension",
"version": "1.0",
"description": "The first extension that I made.",
"background_page": "background.html",
"content_scripts": [
{
"matches": ["http://*/*"],
"js": ["dom.js"]
}
],
"browser_action": {
"default_icon": "icon.png"
},
"permissions": [
"tabs",
"http://ting-1.appspot.com/submithandlertest"
]
}
Update
Inserted console.logs for debugging but I see none of them in the console; in fact dom.js does not even running, I misspelled "else" as "els" and no error was given. But otherwise the extension works well and executes the xhr request. What am I doing wrong?
dom.js
chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
if (request.action == "getDOM")
console.log("dom.js - request action")
sendResponse({dom: document.getElementsByTagName("body")[0]});
console.log("***dom.js - sendResponse***")
else
sendResponse({}); // Send nothing..
console.log("***dom.js - else***")
});
background.html
<html>
<script>
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.getSelected(null, function(tab) {
// Send a request to the content script.
chrome.tabs.sendRequest(tab.id, {action: "getDOM"}, function(response) {
console.log(response.dom);
console.log("background -- where is response.dom")
});
tabId = tab.id;
console.log(tabId)
tabUrl = tab.url
console.log(tabUrl)
tabTitle = tab.title
console.log(tabTitle)
var formData = new FormData();
formData.append("url", tabUrl);
formData.append("title", tabTitle);
formData.append("pitch", "this is a note");
//formData.append("user_tag_list", "tag1, tag2");
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://ting-1.appspot.com/submithandlertest", true);
xhr.onreadystatechange = function (aEvt) {
if (xhr.readyState == 4) {
if (xhr.status == 200){
console.log("request 200-OK");
chrome.browserAction.setBadgeText ( { text: "done" } );
setTimeout(function () {
chrome.browserAction.setBadgeText( { text: "" } );
}, 2000);
}else{
console.log("connection error");
chrome.browserAction.setBadgeText ( { text: "ERR" } );
}
}
};
xhr.send(formData);
console.log("tabUrl: "+ tabUrl)
console.log(formData)
});
});
</script>
</html>
Edit
Edited background.html
as suggested by serg "to wrap all code that needs it into chrome.tabs.sendRequest
callback (all those xhrs)". But this version of the background does not work. I don't get any error messages but nothing happens. What am I doing wrong?
<html>
<script>
chrome.browserAction.onClicked.addListener(function(tab)
{
//chrome.tabs.getSelected(null, function(tab)
//{
// Send a request to the content script.
chrome.tabs.sendRequest(tab.id, {action: "getDOM"}, function(response)
{
console.log(response.dom);
console.log("background -- where is response.dom")
//}); moving this down to include xhr
tabId = tab.id;
console.log(tabId)
tabUrl = tab.url
console.log(tabUrl)
tabTitle = tab.title
console.log(tabTitle)
var formData = new FormData();
formData.append("url", tabUrl);
formData.append("title", tabTitle);
formData.append("pitch", "this is a note");
//formData.append("user_tag_list", "tag1, tag2");
//xhr*********************************************************************************
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://ting-1.appspot.com/submithandlertest", true);
xhr.onreadystatechange = function (aEvt)
{
if (xhr.readyState == 4)
{
if (xhr.status == 200)
{
console.log("request 200-OK");
chrome.browserAction.setBadgeText ( { text: "done" } );
setTimeout(function ()
{
chrome.browserAction.setBadgeText( { text: "" } );
}, 2000);
}
else
{
console.log("connection error");
chrome.browserAction.setBadgeText ( { text: "ERR" } );
}
}
};
xhr.send(formData);
console.log("tabUrl: "+ tabUrl)
console.log(formData)
//xhr**********************************************************************************
}); //chrome.tabs.sendRequest
});
</script>
</html>
Update: Edited dom.js:
chrome.extension.onRequest.addListener
(
function(request, sender, sendResponse)
{
if (request.action == "getDOM")
{
console.log("dom.js - if (request.action == getDom)")
//sendResponse({dom: "The dommmmm that you want to get"});
//sendResponse({dom: document.getElementsByTagName("body")[0]});
sendResponse({dom: document.getElementsByTagName("p")[0]});
console.log("***dom.js - sendResponse***")
//var pageInfo = {
//"title": document.title};
//chrome.extension.sendRequest(pageInfo);
}
else
{
sendResponse({}); // Send nothing..
console.log("***dom.js - else***")
}
}
);
Update with latest background.html with the console.log
s that are showing marked:
<html>
<script>
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.getSelected(null, function(tab) {
// Send a request to the content script.
chrome.tabs.sendRequest(tab.id, {action: "getDOM"}, function(response) {
//NOT SHOWING
console.log(response.dom)
//NOT SHOWING
console.log("background -- where is response.dom")
});
tabId = tab.id;
//SHOWING
console.log(tabId)
tabUrl = tab.url
//SHOWING
console.log(tabUrl)
//SHOWING
tabTitle = tab.title
//SHOWING
console.log(tabTitle)
var formData = new FormData();
formData.append("url", tabUrl);
formData.append("title", tabTitle);
formData.append("pitch", "this is a note");
//formData.append("user_tag_list", "tag1, tag2");
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://ting-1.appspot.com/submithandlertest", true);
xhr.onreadystatechange = function (aEvt) {
if (xhr.readyState == 4) {
if (xhr.status == 200){
//SHOWING
console.log("request 200-OK");
chrome.browserAction.setBadgeText ( { text: "done" } );
setTimeout(function () {
chrome.browserAction.setBadgeText( { text: "" } );
}, 2000);
}else{
//NOT SHOWING
console.log("connection error");
chrome.browserAction.setBadgeText ( { text: "ERR" } );
}
}
};
xhr.send(formData);
//SHOWING
console.log("tabUrl: "+ tabUrl)
//SHOWING
console.log(formData)
});
});
</script>
</html>
You can't do it from a background page, but you can inject content script to all pages, and use message passing to pass this info back to background page on demand.
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