Objective-C/Cocoa windowScriptObject commands not working from loaded page
Question
I am trying to get a 'windowScriptObject' working, this is my Objective-C code below:
- (void)consoleLog:(NSString *)aMessage {
NSLog(@"JSLog: %@", aMessage); }
+ (BOOL)isSelectorExcludedFromWebScript:(SEL)aSelector {
if (aSelector == @selector(consoleLog:)) {
return NO;
}
return YES; }
- (void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame *)frame {
NSLog(@"Did finnish load...");
scriptObject = [sender windowScriptObject];
//obviously, this returns undefined
NSLog(@"Object: %@",[scriptObject evaluateWebScript:@"MyApp"]);
//set the value of MyApp
[scriptObject setValue:self forKey:@"MyApp"];
//this now returns the value
NSLog(@"Object: %@",[scriptObject evaluateWebScript:@"MyApp"]);
//this command now works from here
[scriptObject evaluateWebScript:@"MyApp.consoleLog_('Test');"];
}
The above code works when I inject JavaScript ( evaluateWebScript )
This sis what the console out put is:
2012-12-06 08:03:05.605 BetterDesktop[8669:303] Did finnish load...
2012-12-06 08:03:05.605 BetterDesktop[8669:303] Object: undefined
2012-12-06 08:03:05.606 BetterDesktop[8669:303] Object: <WidgetsDelegate: 0x10133de60>
2012-12-06 08:03:05.607 BetterDesktop[8669:303] JSLog: Test
The command works, however when I use a page it doesn't work.
<html>
<head>
<script type="text/javascript">
if (typeof(MyApp) != "undefined"){
document.write('<br/><h1>hi</h1>');
MyApp.consoleLog_('Test from HTML');
}
else{
document.write('<br/><h1>Not Defined</h1>');
}
</script>
</head>
<body>
</body>
</html>
It believes that 'MyApp' is undefined, any suggestions?
(By the way, the WebView is not connected to this class, it is just the delegate)
1 answers
solution1
4 ACCPTED 2013-01-19 23:56:58
You should inject your objects in to the WebView from within the -webView:didClearWindowObject:forFrame: WebFrameLoadDelegate method rather than within -webView:didFinishLoadForFrame: . The window object is not guaranteed to have been correctly initialized until didClearWindowObject is called.
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