UIWebView not evaluating javascript properly
I'm trying to run some javascript against a UIWebView but it's doesn't seem to be working. For example, here i开发者_如何学编程s 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];
Implement the UIWebViewDidfinishLoading method and write following code inside it
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
NSString *markupResult = [webView stringByEvaluatingJavaScriptFromString:parser];
}
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.
加载中,请稍侯......
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