How to add jQuery to existing page in UIWebView?

Question

I am trying to inject jQuery into UIWebViewpages that I cannot control, such as Google. When a UITextFieldgets focus, I execute the following lines of code:

NSString* scriptInject = @"var headElement = document.getElementsByTagName('head')[0]; var script = document.createElement('script'); 
    script.setAttribute('src','http://jquery.com/src/jquery-latest.js');
    script.setAttribute('type','text/javascript'); headElement.appendChild(script);";
    [myWebView stringByEvaluatingJavaScriptFromString:scriptInject];    
    [myWebView stringByEvaluatingJavaScriptFromString:@"$(document).ready(function() {$('body').css('background', '#FF0000');}"];

I am doing a background change to verify that I can run a jQuery script. I can verify that the Objective-C method is being called, and I even set the alertnewly created tag to load <script>, so I know that it runs in UIWebView. How do I insert it correctly to execute it?

EDIT:

I have an event by trying this after calling a function to change color:

[myWebView stringByEvaluatingJavaScriptFromString:@"alert($('body').css());"];

There are no warnings.

Answer 1

jQuery DOM, stringByEvaluatingJavaScriptFromString: . , : HTML/ iOS.

Answer 2

:

NSString *jqueryCDN = @"http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js";
NSData *jquery = [NSData dataWithContentsOfURL:[NSURL URLWithString:jqueryCDN]];
NSString *jqueryString = [[NSMutableString alloc] initWithData:jquery encoding:NSUTF8StringEncoding];
[webView stringByEvaluatingJavaScriptFromString:jqueryString];

[webView stringByEvaluatingJavaScriptFromString:/*jquery commands here*/];

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