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do external javascript on a website objective C

Answer 1

+1 A:

I only know this in the context of iPhone APIs...

Assuming you have the page loaded in a UIWebView inside your app...

You can call UIWebView method stringByEvaluatingJavaScriptFromString: to send javascript to the page.

If the calling function returns anything, it will be typecast as a NSString and returned to your app, but in your case it looks like you can just ignore the return value. You might need to make your Javascript look something like:

(function(){
   change();
   return "hello world";
})();

because I'm not sure how well it handles void return values.

Mike Ruhlin 2010-10-21 21:30:36

Yep this is the method you want, and will execute any JS you provide it. But you do not to explicitly return a value from the Javascript at all, as it will simply return `nil` if no return ever happens in the JS.

Squeegy 2010-10-21 21:35:14

Thanks for the reply...let me see if i got it right: i can do javascript on a website through objective-C, for example if i got a function named "hello" on the site i can call that function and my UIWebView will automatically update after doing the javascript. but i don't understand how i would put the "(function(){ change(); return "hello world";})();" inside a program. :/hope for some more help :)

2010-10-24 20:17:18

NSString* jsToEvaluate = @"change()";NSString* ret = [webView stringByEvaluatingJavaScriptFromString:jstoEvaluate];

Mike Ruhlin 2010-10-25 04:47:27

thank you very much :)

2010-10-25 07:02:52

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