I'd like to launch the print dialog on button click in my google chrome extension. The code seems to be working when the extension's html file is opened as a standalone file, but not when it's loaded as an extension.
HTML:
<input id="print_page" type="button" value="Print" onclick="print_p()" />
JavaScript: function print_p(){ window.print();}
Any idea as to what's wrong?
Aside from the inline JavaScript problem that I mentioned as a duplicate, it seems that invoking the print dialog from a popup (or a background page) is impossible.
A workaround would be to have a "print helper" page in your extension, that opens in a normal tab and can open a print dialog.
A possible architecture:
On a click in a popup, data to print is being sent to the background page:
function printClick(){
chrome.runtime.sendMessage({ print: true, data: whateverYouWantToPrint });
}
It's routed through the background page so that you don't have to worry about popup closing.
In the background page, a helper page is opened:
var printData;
chrome.runtime.onMessage.addListener( function(request, sender, sendResponse){
if(request.print) {
printData = request.data;
chrome.tabs.create(
{ url: chrome.runtime.getURL("print.html") }
);
}
// ...
});
In the print helper page, a script print.js requests the data, formats it as required and invokes the print dialog:
chrome.runtime.sendMessage({ getPrintData: true }, function(response){
formatDataIntoPage(response.data);
window.print();
});
Back in the background page, serve the data on request from print helper:
chrome.runtime.onMessage.addListener( function(request, sender, sendResponse){
// ...
if(request.getPrintData) {
sendResponse({ data: printData });
}
});
Related
How am I going to write something when user clicks extension icon and loads the window?
I've already tried
window.onload = function() {
console.log("das");
}
and ]
$(document).ready(function(){
console.log('document is ready');
});
but still there isn't any log?
Maybe it's not the best idea but you can use chrome.tabs.sendMessage and chrome.runtime.onMessage.addListener to communicate between contentscript.js and popup.js
contentscript.js is running directly in page scope so you can easily detect when page is ready. After that you can send a message chrome.tabs.sendMessage(tabs.id, {action: 'pageReady'});. In popup.js you are listening to:
chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
if (request.action === 'pageReady') {
// Do what you want to do on page ready
}
});
It should works good for you. You can also send response to the caller:
contentscript.js send information to the popup.js that page is ready.
popup.js do what you want to do (show table).
popup.js send information to the contentscript.js that table is added.
EDIT
I'm not sure about my solution because I found information that:
The popup, while being an extension page, is not a background page. It
is only accessible when it is open
I don't know if it is possible to listen on events in popup. You need to check it.
I'm trying to communicate with the content script of the tab that has just been switched to using message passing. Here is my code in the background.js script.
chrome.tabs.onActivated.addListener(function(activeInfo) {
chrome.tabs.sendMessage(activeInfo.tabId, { greeting: "hello" }, function(response) {
console.log(response.farewell);
});
});
And here is my code in my content script:
chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
sendResponse({ farewell: "goodbye" });
loadContent();
});
Is the content script no longer listening in an inactive tab even when it's switched back to that tab? Why does this only run in a newly opened tab?
To further clarify why I want to do this, sometimes tabs are left open without reloading, and my script has already been executed. When information pertaining to the script changes using the popup options, I want the content to reload on tab change, and a particular function to run again without reloading the page. Therefore, injecting the content script is less than ideal since it's already been executed.
Try this :
background.js
chrome.tabs.onActivated.addListener(function(activeInfo) {
chrome.tabs.query({
active: true,
currentWindow: true
}, function(tabs) {
chrome.tabs.sendMessage(activeInfo.tabId,
{ greeting: "hello" }, function(response) {
console.log(response.farewell);
});
});
});
I'm trying to create a popup chrome extension that shows information about the DOM in the current page, which seems to require messaging. I've been able to send messages to the background, but I need the data to be specific to the current page, as the background is identical to all popups/pages.
In popup.js, I send a message when the DOM is loaded (should trigger when popup is clicked?)
document.addEventListener('DOMContentLoaded', function() {
chrome.runtime.sendMessage({method: "getTableData"}, function response() {
});
});
I also have a listener in the contentscript.js (and background.js for testing)
chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
if(request.method == "getTableData") {
console.log("table request found!");
}
});
Then, when I activate the popup, the background console outputs table request found!, while
the console for the current page doesn't.
Thanks.
You need to use chrome.tabs.sendMessage instead of chrome.runtime.sendMessage to send a message to a content script.
I want to execute a script on a precise tab of my browser. This script will give back a value.
I don't know what I have to use. The Doc says that contentScript are called on every loading of a new page. I just want to execute the script once the user clicked on a button in my popup.html.
In your contentScript file add listener like this:
chrome.extension.onMessage.addListener(function(msg, sender, sendResponse) {
//do job
sendResponse(...);
});
And in your popup.html on click event:
chrome.tabs.sendMessage(tabid, "message", function responseCallback(response) {
//...
});
more info http://developer.chrome.com/extensions/tabs.html#method-sendMessage
Google Chrome Extensions Message Passing Problem :
In this Chrome Extension
My Popup Page:
chrome.browserAction.onClicked.addListener(getMessage);
getMessage();
function getMessage()
{
chrome.tabs.getSelected(null, function(tab) {
chrome.tabs.sendRequest(tab.id, {greeting: "hello"}, function(response) {
console.log(response.farewell);
});//getting response from content script
});
}
My Script Page :
chrome.extension.onRequest.addListener(
function(request, sender, sendResponse) {
if (request.greeting == "hello")
sendResponse({farewell: "goodbye"});
else
sendResponse({});
});
I am not getting any response from the content script.
Edits:
As per #serg , i have moved the code to the background page. But still, it is not working
You can't have chrome.browserAction.onClicked listener if you have popup page attached to the browser action button, it won't fire.
Remove popup, leave only button
Move everything into background page.
Replace tab.id with null.
Remove createFile(); call at the beginning as it won't do anything in this case (content script isn't ready to listen yet).
Don't use alerts for debugging extension, use console.log().