ios - Auto focus text field in UIWebview -

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I am loading the webview form in my iOS app and I want to autofocus a textfield on the form. I tried 

  NSString * focus = [NSString stringWithFormat: @ "document.getElementsByName ('j_captcha') [0]. Focus ()"]; [Self.webView stringByEvaluatingJavaScriptFromString: Focus];

But it seems that there is no work to do. "J_captcha" is the name of the textfield. How can I get it?

This did the trick for me 

  NSString * evalStr = [NSString StringWithFormat: @ "setTimeout (function () {document.getElementsByName ('j_captcha') [0]. Focus ();}, 1000);"]; [WebView stringByEvaluatingJavaScriptFromString: evalStr];

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