How to parse a value from javascript assignment statement in objective-c

Question

I'm working with an api that requires a key only found when doing an Http GET request from the initial web page. So in my app I do a simple GET request and get back the xhtml. I'm looking for advice about how to pull a specific value from a javascript assignment statement found in this response.

<html>
 <body>
  <div>
  </div>
  <script type="text/javascript">abc.123.key = 'Ikc8StJJiJ2Pq/Dl+iUz3MFzk6qnL7mz6hFFkn5LtZM=';</script>
 </body>
</html>

In the example above I'm looking to capture the value "Ikc8StJJiJ2Pq/Dl+iUz3MFzk6qnL7mz6hFFkn5LtZM=" from the assignment of abc.123.key. Should I do a simple regex and if so what would a simple example look like to get me started?

Joe · Accepted Answer · 2010-12-24 00:34:35Z

2

If you are loading this xhtml into an UIWebView you can do the following

NSString* key = [myWebView stringByEvaluatingJavaScriptFromString:@"abc.123.key"];

answered Dec 24, 2010 at 0:34

Joe

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Comments

pgb · Accepted Answer · 2010-12-24 00:33:45Z

1

You can drill down using XPath to get to the script tag, with an expression like /html/body/script/text(), and then use a simple regex to get the key you want.

answered Dec 24, 2010 at 0:33

pgb

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1 Comment

Toran Billups Over a year ago

Any way I could get a little more detail on this solution in pure XPath? The typical google search isn't returning much of value for a simple example like this (library free that is).

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