使用stringByEvaluatingJavaScriptFromString document.getElementsByClassName从UIWebView获取数据

Question

I want to catch an image from a UIWebView . So I run the following code on the WebView where the website is completely loaded.

    NSString *test = [self.webView stringByEvaluatingJavaScriptFromString:@"document.getElementsByClassName('first-carousel-item')[0].getAttribute('data-img');"];
    NSLog(@"test %@", test);

But the log writes:

Printing description of test: <object returned empty description>

The Javascript works well on the Chrome console.

Answer 1

if u want to catch anything from a webview don't forget to delegate it

[webView setDelegate:Self];

and when it uses the image use the webViewDidFinishLoad

if u any more questions i here :D