如何将JQuery注入UIWebView中的现有页面？ [英] How to inject JQuery into existing page within a UIWebView?

问题描述

我正在尝试将JQuery注入我无法控制的页面的 UIWebView ，例如Google。当 UITextField 获得焦点时，我正在执行以下代码行：

I am trying to inject JQuery into a UIWebView of a page that I can't control, say Google, for example. When a UITextField gets focus, I am executing 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');}"];

我正在执行后台更改以验证我能够运行JQuery脚本。我可以验证Objective-C方法正在调用，我甚至为新创建的< script> 标记的onload种植了一个 alert ，所以我知道它正在 UIWebView 中执行。如何正确地执行它我可以执行它？

I am executing the background change to validate that I am able to run a JQuery script. I can verify that the Objective-C method is being called, and I even planted an alert for the onload of the newly created <script> tag, so I know that it is being executed in the UIWebView. How do I inject it correctly that I can execute it?

编辑：

我在调用函数改变颜色后尝试了这个事件：

I have event tried this after calling the function to change the color:

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

没有警报显示。

推荐答案

如果jQuery不在DOM中，你可以使用 stringByEvaluatingJavaScriptFromString：注入它。我我有类似的问题，我写了一篇关于它的博客文章： iOS中的HTML解析/屏幕抓取。

If jQuery is not in the DOM already you can use stringByEvaluatingJavaScriptFromString: to inject it. I've had similar problem, I wrote a blog post about it: HTML parsing/screen scraping in iOS.

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