Re: Call getElementById in Cocoa
Re: Call getElementById in Cocoa
- Subject: Re: Call getElementById in Cocoa
- From: Rob Keniger <email@hidden>
- Date: Tue, 25 Nov 2008 18:44:05 +1000
On 25/11/2008, at 12:32 PM, Pierce Freeman wrote:
Sorry for my newbie-ness, but I still don't really get what you are
talking
about. Are you saying that I should do this:
[WebView setFrameLoadDelegate:didFinishLoadForFrame];
- (void)didFinishLoadForFrame
{
// Do stuff
}
No, you would do this:
[webView setFrameLoadDelegate:controller];
The controller object would be whatever object is controlling the web
view. It's quite likely you'd just set the delegate to self.
Note that you calling the method on your WebView instance, not the
WebView class, as -setFrameLoadDelegate: is an instance method.
You then have to implement the delegate method in your controller class:
- (void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame
*)frame
{
//when this method is called, the load of the webview is finished
DOMDocument *dom = [sender mainFrameDocument];
DOMElement* element= [dom getElementById:@"hiddenField"];
NSString* elementValue=[element getAttribute:@"value"];
//do something with elementValue
}
Note that this is asynchronous, the main thread will not wait for the -
webView:didFinishLoadForFrame: method will be called. As already
pointed out, if you need to block while waiting for the web view to
load you'd need to do something like this instead of implementing the
delegate:
[[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL
URLWithString:@"http://www.domain.com/page.html";]]];
//block while the webview loads
while ([webView isLoading])
{
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:
[NSDate distantFuture]];
}
DOMDocument *dom = [webView mainFrameDocument];
DOMElement* element= [dom getElementById:@"hiddenField"];
NSString* elementValue=[element getAttribute:@"value"];
//do something with elementValue
--
Rob Keniger
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