Javascript UIWebView stringByEvaluatingJavaScriptFromString
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UIWebView stringByEvaluatingJavaScriptFromString
提问by TomH
I'm stuck on getting some pretty basic JS to run in my UIWebView. In the web view's delegate, I have :
我一直坚持在我的 UIWebView 中运行一些非常基本的 JS。在网络视图的委托中，我有：
- (void)webViewDidFinishLoad:(UIWebView *)wView {
NSString *someHTML = [wView stringByEvaluatingJavaScriptFromString:@"document.getElementsByClassName('box')[0]"];
NSString *allHTML = [wView stringByEvaluatingJavaScriptFromString:@"document.body.innerHTML"];
NSLog(@"someHTML: %@", someHTML);
NSLog(@"allHTML: %@", allHTML);
}
but when the method is invoked, someHTML is nil while allHTML contains the entire body of the HTML in the webview.
但是当调用该方法时， someHTML 为零，而 allHTML 包含 web 视图中 HTML 的整个主体。
I've run the JS in the Safari JS console and it works just fine (it finds a div of class 'box' so I know that its in the HTML)
我已经在 Safari JS 控制台中运行了 JS，它工作得很好（它找到了一个 'box' 类的 div，所以我知道它在 HTML 中）
Any suggestions?
有什么建议？
More info:
更多信息：
FWIW, result in each of the following is also nil
FWIW，导致以下每个也是零
NSString *result = [self.webView stringByEvaluatingJavaScriptFromString: @"document"];
NSLog (@"1. result: %@", result); //should log the document object?
result = [self.webView stringByEvaluatingJavaScriptFromString: @"document.body"];
NSLog (@"2. result: %@", result); //should log the document body
result = [self.webView stringByEvaluatingJavaScriptFromString: @"document.body.getElementsByClassName"];
NSLog (@"3. result: %@", result); //should log a function
result = [self.webView stringByEvaluatingJavaScriptFromString: @"document.body.getElementsByClassName('box')[0]"];
NSLog (@"4. result: %@", result); //should log the node
回答by TomH
Changing
改变
NSString *someHTML = [wView stringByEvaluatingJavaScriptFromString:@"document.getElementsByClassName('box')[0]"];
to
到
NSString *someHTML = [wView stringByEvaluatingJavaScriptFromString:@"document.getElementsByClassName('box')[0].innerHTML;"];
(added the .innerHTML)
（添加了 .innerHTML）
makes all the difference in the world . . .
使世界变得不同。. .
