Safari extension running injected javascript multiple times - Stack Overflow

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I have copied the code from the following example on the Apple Developer site.

.html#//apple_ref/doc/uid/TP40009977-CH14-SW1

When I run the extension, it runs normally except the injected script is run 3 times causing the output to be written to console.log 3 times. I also put a alert in the doBigCalc function and it opened 3 alerts.

Why is this happening/is it supposed to happen?

I have copied the code from the following example on the Apple Developer site.

https://developer.apple./library/content/documentation/Tools/Conceptual/SafariExtensionGuide/MessagesandProxies/MessagesandProxies.html#//apple_ref/doc/uid/TP40009977-CH14-SW1

When I run the extension, it runs normally except the injected script is run 3 times causing the output to be written to console.log 3 times. I also put a alert in the doBigCalc function and it opened 3 alerts.

Why is this happening/is it supposed to happen?

• javascript
• safari
• safari-extension

Share Improve this question Follow edited May 5, 2018 at 13:42 Cœur 38.8k2626 gold badges205205 silver badges277277 bronze badges asked Jul 6, 2010 at 22:45 Craig SiemensCraig Siemens 13.3k11 gold badge3535 silver badges5454 bronze badges

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2 Answers 2

Sorted by: Reset to default 8

You don't speak to your implementation, but it could be that your code isn't the problem. The key is understanding that an injected script is loaded .... From the injected script documentation:

Scripts are injected into the top-level page and any children with HTML sources, such as iframes. Do not assume that there is only one instance of your script per browser tab.

The documentation mentions that you can dispatch messages using event handlers on three different levels:

safari.application.activeBrowserWindow.activeTab.addEventListener("message", waitForMessage, false);

safari.application.activeBrowserWindow.addEventListener("message", waitForMessage, false);

safari.application.addEventListener("message", waitForMessage, false);

But you should choose one of the the three. You aren't attaching event listeners to all three are you? If you are, you'll get it run three times for sure.

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