[webkit-dev] Javascript / Obj-c object property mismatch

[Rudi Sherry]

Thanks! I figured it was something simple that I had wrong conceptually.

On Oct 26, 2006, at 9:12 AM, Timothy Hatcher wrote:

> A JavaScript property is not the same as an element attribute.
>
> It is unfortunate that some attributes like "onclick" get mapped  
> from attributes to properties, but this is a special case for  
> compatibility. But if you later change the onclick property the  
> attribute doesn't change.
>
> The equivalent of 'myObject.command = value' in ObjC is '[myObject  
> setValue:value forKey:@"command"]'. Then the matching call  
> '[myObject valueForKey:@"command"]' to get the value back.
>
> JavaScript has the same setAttribute and getAttribute methods if  
> you do want to change an attribute. Hope this helps.
>
> — Timothy Hatcher
>
>
> On Oct 26, 2006, at 8:47 AM, Rudi Sherry wrote:
>
>> I'm working with a WebView where I use DOM object manipulation in  
>> objective-c combined with javascript.
>>
>> I have the dom document and I add an object with some attributes  
>> like this:
>>
>> 	DOMNodeList *list = [ domDoc getElementsByTagName: @"BODY" ];
>> 	DOMNode *body = [ list item: 0 ];
>> 	myObject = (DOMHTMLObjectElement *) [ [ domDoc createElement:  
>> @"OBJECT" ] retain ];
>> 	[ myObject setAttribute: @"ID" : @"MyObjectName" ];
>> 	[ myObject setAttribute: @"NAME" : @"MyObjectName" ];
>> 	<snip>
>> 	[ myObject setAttribute: @"command" : @"xxx" ];
>> 	[ body appendChild: myObject ];
>>
>> In the javascript, I can get the object with this and check its  
>> value (this is in a javascript function that gets called):
>>
>> 	var myObject = document.body.children['MyObjectName'];
>> 	alert(myObject.command);
>> 	myObject.command = "abcdef";
>> 	alert(myObject.command);
>>
>> I have a WebUIDelegate with the runJavaScriptAlertPanelWithMessage  
>> that prints out the alert value and compares it against myObject:
>>
>> - (void)webView:(WebView *)sender  
>> runJavaScriptAlertPanelWithMessage:(NSString *)message
>> {
>> 	NSLog (@"alert: %@", message);
>> 	NSLog( @"command attribute: %@", [ mSwfObject getAttribute:  
>> @"command" ] );
>> }
>>
>>
>> In the above example, it prints out:
>>
>> 2006-10-26 08:44:29.771 TestInsideWebKit[9235] alert: xxx
>> 2006-10-26 08:44:29.771 TestInsideWebKit[9235] command attribute: xxx
>> 2006-10-26 08:44:29.771 TestInsideWebKit[9235] alert: abcdef
>> 2006-10-26 08:44:29.771 TestInsideWebKit[9235] command attribute: xxx
>>
>>
>> Why isn't the command attribute changed in the objective-c object  
>> when it's changed in the javascript function?  It must be the same  
>> object since it started as 'xxx'.
>>
>> Any help would be appreciated,
>>
>> Thanks,
>> Rudi
>>
>> _______________________________________________
>> webkit-dev mailing list
>> webkit-dev at opendarwin.org
>> http://www.opendarwin.org/mailman/listinfo/webkit-dev
>

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