How can I run this script when the tab reloads (chrome extension)?

Question

So i'd like to run a script when the tab reloads in a specified URL. It almost works, but actually id doesn't :) This is my manifest file:

{
"manifest_version": 2,

"name": "Sample Extension",
"description": "Sample Chrome Extension",
"version": "1.0",

"content_scripts":
[
    {
      "matches": ["http://translate.google.hu/*"],
      "js": ["run.js"]
    }
],

"permissions":
[
    "activeTab",
    "tabs"
],

"browser_action":
{
    "default_title": "Sample",
    "default_icon": "icon.png"
}
}

and this is run.js:

chrome.tabs.onUpdated.addListener(
function ( tabId, changeInfo, tab )
{
    if ( changeInfo.status === "complete" )
    {
        chrome.tabs.executeScript( null, {file: "program.js"} );
    }
}
);

The programs.js just alerts some text (yet). When I put an alert to the first line of the run.js, it alerts, but when I put it in the if, it doesn't. I can't find the problem. Did I type something wrong?

Answer 1

2021

If you want to detect reload from background.js in manifest 3 (maybe also 2), chrome.tabs.onUpdated approach didn't work for me :/ It was invoked too many times.

That what worked for me in the end!

// --- On Reloading or Entering example.com --- 
chrome.webNavigation.onCommitted.addListener((details) => {
    if (["reload", "link", "typed", "generated"].includes(details.transitionType) &&
        details.url === "http://example.com/") {

        codeAfterReload();

        // If you want to run only when the reload finished (at least the DOM was loaded)
        chrome.webNavigation.onCompleted.addListener(function onComplete() {

            codeAfterReloadAndFinishSomeLoading();

            chrome.webNavigation.onCompleted.removeListener(onComplete);
        });
    }
});

For more transition types: https://developer.chrome.com/docs/extensions/reference/history/#transition_types

good luck :)