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Re: Dynamically reset the DOM?

Subject: Re: Dynamically reset the DOM?
From: Michael Hanna <email@hidden>
Date: Fri, 2 Dec 2005 15:19:05 -0800
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scriptObject is a field instance of the delegate class. It's an NSObject subclass called LJSScriptObject.

LJSScriptObject * scriptObject;

I've added this in windowScriptObjectAvailable:
[wso setValue:scriptObject forKey:@"scrObject"];

but doing this creates no discernible difference.

I'm using pre-existing JavaScript, which cannot be modified. 'scrObject' is the name and parameter I have to use.

what confuses me is that using loadRequest:pathForResource: will allow me to get a result, "1000", while inserting a new string with loadHTMLString:baseURL: returns me a result(whether or not I have [wso setValue:scriptObject forKey:@"scrObject"]; in the webView:windowScriptObjectAvailable:. In both cases webView:windowScriptObjectAvailable: are called.

what if I generated scratch files in a temporary directory and reload them with loadRequest:pathForResource: ?

Michael

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Michael Hanna
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On 2-Dec-05, at 2:36 PM, Geoffrey Garen wrote:

What kind of object is scriptObject?
Consider this note from http://developer.apple.com/documentation/ AppleApplications/Reference/Dashboard_Ref/Plugin/ chapter_5_section_1.html

Note: The objects you expose to JavaScript using this technique may conform to the WebScripting interface of Web Kit, which is available in Mac OS X version 10.4. The Web Kit uses the methods of this interface to allow you to control which methods you expose from your Objective-C class. For more information, see Using Objective-C From JavaScript in Cocoa User Experience Documentation.
To test if an invalid argument is your problem, change cocoacalling to take no arguments and issue a simple alert and see if it executes.
Geoff
It seems OK, I added NSLog to both methods:
2005-12-02 13:26:08.000 DTRoot[19607] setJSInWebView: <HTML><HEAD><TITLE> </TITLE><SCRIPT type="text/javascript"></ SCRIPT></HEAD><BODY style="border: 0; margin: 0; padding: 0">loaded from -awakeFromNib</BODY></HTML> 2005-12-02 13:26:08.010 DTRoot[19607] windowScriptObjectAvailable 2005-12-02 13:26:08.016 DTRoot[19607] didFinishLoadForFrame 2005-12-02 13:26:08.016 DTRoot[19607] didFinishLoadForFrame: <HTML><HEAD><TITLE> </TITLE><SCRIPT type="text/javascript"></ SCRIPT></HEAD><BODY style="border: 0; margin: 0; padding: 0">loaded from -awakeFromNib</BODY></HTML> 2005-12-02 13:26:08.016 DataTypeRoot[19607] (null) result
Michael
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Michael Hanna
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iChat: michaelkhanna(AIM)
On 2-Dec-05, at 11:50 AM, Geoffrey Garen wrote:
It would be interesting to NSLog the result of the outerHTML call to see exactly what HTML you end up reloading. I suspect the result does not include the script you've constructed, which may indicate a bug in WebKit.
Geoff
On Dec 2, 2005, at 11:21 AM, Michael Hanna wrote:
Hi I'm trying to inject JS into the DOM dynamically, but I'm having trouble getting a result from the injected JS which *would* give me a result when I loaded the standard way from a file.
The html code in the webview is like this at first:
-awakeFromNib: [[webView mainFrame] loadHTMLString:@"<html><head><title> </ title></head><body style='border: 0; margin: 0; padding: 0'>loaded from -awakeFromNib</body></html>" baseURL:nil];

then, after didFinishLoadForFrame: is called, I try to dynamically reset the DOM:

-(IBAction)setJSInWebView:(id)sender { NSString * scriptPreamble = @""; NSString * scriptString = @""; DOMDocument *doc = [[webView mainFrame] DOMDocument]; DOMNodeList *list = [doc getElementsByTagName:@"HEAD"]; assert([list length] > 0); DOMNode *body = [list item:0]; DOMElement *el = [doc createElement:@"SCRIPT"]; [el setAttribute:@"type" :@"text/javascript"]; [body appendChild:el]; scriptString = [NSString stringWithFormat:@"%@%@%@", scriptString, scriptPreamble, scriptPostamble]; [el appendChild:[doc createTextNode:scriptString]];

[[webView mainFrame] loadHTMLString:[(DOMHTMLElement *) [[[webView mainFrame] DOMDocument] documentElement] outerHTML] baseURL:nil]; }
but once didFinishLoadForFrame: is called the result is null:
- (void)webView:(WebView *)webView didFinishLoadForFrame: (WebFrame *)frame { NSLog(@"didFinishLoadForFrame"); WebScriptObject * wso = [webView windowScriptObject]; id result; NSArray * args = [NSArray arrayWithObjects:scriptObject, nil]; result = [wso callWebScriptMethod:@"cocoacalling" withArguments:args]; NSLog(@"%@ result", result); }

I know my technique is in error in some way. Is there a way to dynamically inject JS like I'm trying to?
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Michael Hanna
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iChat: michaelkhanna(AIM)
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Follow-Ups:
- Re: Dynamically reset the DOM?
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References:
	>Dynamically reset the DOM? (From: Michael Hanna <email@hidden>)
	>Re: Dynamically reset the DOM? (From: Geoffrey Garen <email@hidden>)
	>Re: Dynamically reset the DOM? (From: Michael Hanna <email@hidden>)

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