Access another pages inside extension from content script or background page
everyone. Can anybody tell me how I can access DOM of another pages in my extension from content script or background page? I tried to make a connection from content script to popup.html. But it doesn't work. But the same code works with background.html... Here's the code I place in myscript.js:
function sendLast(){
var result = document.getElementById('last_3212164'); //document.evaluate("//*[@id='last_3212164']", document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null );
alert(result.textContent);
chrome.extension.sendRequest({greeting: "hello"}, function(response) {
console.log(response.farewell);
});
}
var t=setTimeout("sendLast()", 3000);
Here is code from popup.html:
<html>
<head>
<script>
chrome.extension.onRequest.addListener(
function(request, sender, sendRes开发者_如何转开发ponse) {
alert("Got it!");
if (request.greeting == "hello")
sendResponse({farewell: "goodbye"});
else
sendResponse({}); // snub them.
}
);
</script>
</head>
<body>
Here will be the values
</body>
</html>
This code is supposed to give alert "Got it" every 3 second. But It doesn't do anything, silence... I open Popup.html 1 sec after loading the main page.
If popup is currently opened then you can access its DOM from a background page. If you need it in a content script then you would need to send a request to a background page first.
Lets say you want to read a value of test input field from a popup inside a content script:
content_script.js:
chrome.extension.sendRequest({cmd: "findElementInPopup"}, function(response){
console.log("value:", response);
});
background.html:
chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
if(request.cmd == "findElementInPopup") {
var winArray = chrome.extension.getViews({type:"popup"});
//if popup is opened
if(winArray.length > 0) {
sendResponse(winArray[0].document.getElementById("test").value);
}
}
});
You would need to do all the DOM manipulations in a background page as trying sending whole window through a response back to a content script would result in an error (object structure is too complex for json serialization).
加载中,请稍侯......
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