UIWebView not evaluating javascript properly

Question

I'm trying to run some javascript against a UIWebView but it's doesn't seem to be working. For example, here is a snippet of html I'm using to test:

<html><body><h1>Hello World!</h1><p>It's me.</p></body></html>

If I run the following javascript against it, the return value is 0, when it should be 1.

var elements = document.getElementsByTagName("h1");
elements.length;

Here's the objc code I'm using for the webview. 'parser' is a string containing the above javascript:

[webView loadHTMLString:@"<html><body><h1>Hello World!</h1><p>It's me.</p></body></html>" baseURL:nil];
NSString *markupResult = [webView stringByEvaluatingJavaScriptFromString:parser];

Biranchi · Accepted Answer · 2010-06-30 05:14:11Z

3

Implement the UIWebViewDidfinishLoading method and write following code inside it

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    NSString *markupResult = [webView stringByEvaluatingJavaScriptFromString:parser];
}

answered Jun 30, 2010 at 5:14

Biranchi

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jammur · Accepted Answer · 2010-06-17 05:02:40Z

1

Upon further investigation, the problem turned out to be that webview hadn't finished loading when the javascript was called. I had to call the javascript from the webViewDidFinishLoad delegate callback.

answered Jun 17, 2010 at 5:02

jammur

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