Conditional pageMod Content Script Injection?

[Geek in Training]

How do I insert a content script only when a certain condition is true? 
For example: if (changeSite === true) { /*let pageMod insert content script*/ }

I am not talking about being conditional like whether site matches  *.example.com/* or not, but rather if site matches *.example.com/* AND someVariable == true.

var pageMod = require("sdk/page-mod");
 
pageMod.PageMod({
  include: "*.mozilla.org",
  contentScript: 'window.alert("Page matches ruleset");'
});

[Jeff Griffiths]

You want instead tab.attach:

https://addons.mozilla.org/en-US/developers/docs/sdk/latest/modules/sdk/tabs.html#attach%28options%29

The one limitation that immediately comes to mind is that not all
page-mod features ( contentStyleFile for example ) are supported.

Jeff

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[Geek in Training]

Okay, thanks! I that works well for my case, I do not need to add any content scripts.

[Geek in Training]

Oops, I meant to write I do not need to add any content styles.

 I just came across a problem, I need the script injected on 'start', but there is no start event, just 'ready'.

Is there any way around this?

[Jeff Griffiths]

That's a limitation of tabs.atach, you don't have any control over
when it attaches, it only does 'ready'. Can you gibe us a bit more of
an idea what you are trying to do?

Jeff

[Geek in Training]

I am making a basic userAgent switcher. I have got the request header part all done, but I also want to override the javascript property navigator.userAgent. (Some other ones too.)  To do that I insert a content script:

Object.defineProperties( unsafeWindow.navigator, {
    'userAgent': { get: function() { return self.options.userAgent; } }
});

But for this to do any good it has to be loaded before any other scripts do. As I mentioned before, I want this to only be inserted if a certain condition is true. In my case it is a simple on off switch for the user.

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[Geek in Training]

Is there  a way to  do this with the low-level SDK APIs? working with tab.attach() would be perfect if there was a start event for tabs, like tabs.on( "start", function(){} )

On Friday, June 14, 2013 10:14:50 PM UTC-7, Jeff Griffiths wrote:

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