How to get a paragraph from the active tab with chrome extension?
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.logs that are showing marked:
<html>
<script>
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.getSelected(null, fun开发者_运维技巧ction(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.
加载中,请稍侯......
精彩评论