I am trying to get some experience with chrome extensions. I have a question though. Let's say I am writing an extension that everytime you see the word (wow) in the url, i will alert the user with a red page that they have to click on accept to pass, or an alert box that they have to get through in order to see the page, how would i:

1) get the url of the page 2) make the red alerting page, or the alert box without the need for the user to actually go click at the extension's icon to get information?

Thank you so much

I am trying to get some experience with chrome extensions. I have a question though. Let's say I am writing an extension that everytime you see the word (wow) in the url, i will alert the user with a red page that they have to click on accept to pass, or an alert box that they have to get through in order to see the page, how would i:

1) get the url of the page 2) make the red alerting page, or the alert box without the need for the user to actually go click at the extension's icon to get information?

Thank you so much

• javascript
• google-chrome-extension

Share Improve this question Follow edited Jan 14, 2013 at 13:40 Eonasdan 7,79399 gold badges6060 silver badges8585 bronze badges asked Jan 14, 2010 at 5:04 user220755user220755 4,4461616 gold badges5555 silver badges7171 bronze badges

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2 Answers 2

Sorted by: Reset to default 5

It's certainly late, but I thought I'd answer anyway. What you need is a content script. You can set it to match on certain domains and then do a more granular filter inside the script checking against window.location and alerting/displaying a div layer for matched URLs. The content script has full access to the page DOM so you can easily hide or dim it and show a warning.

Can also be done using chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab){})... API. One can find if(tab.url.indexOf("www.wow.") > -1){ //do things here }