shouldStartLoadWithRequest not being fired

superfahd · 07-02-2009, 04:54 PM

I have a view controller with a UIWebView controller. I'm trying to get the javascript inside the html content of the web view to pass some information to my objective c code.

I came across a number of examples online that set window.location in a javascript function and then catch the event generated by setting the view controller to be the web view's delegate and catching it in the shouldStartLoadWithRequest function. Unfortunately I can't get it to work because for me shouldStartLoadWithRequest is never called even though I'm setting the web view's delegate.

My code is as follows:

The interface:

Code:

@interface StoryTextViewController : UIViewController <UIWebViewDelegate>
    {
    	IBOutlet UIWebView *storyWebView;	
    	NSString *information;
    }
    
    @property (nonatomic, retain) IBOutlet UIWebView *storyWebView;
    @property (nonatomic, retain) NSString *information;
    
    @end

In the interface, the *information variable is set by the previous view that calls StoryTextViewController.

The implementation:

Code:

#import "StoryTextViewController.h"
    
    @implementation StoryTextViewController
    
    @synthesize storyWebView;
    @synthesize information;
    
    - (NSString *) contructHTMLText
    {
    	NSString *HTMLText = @"";
    	
    	NSArray *words = [information componentsSeparatedByString:@" "];
    	NSString *header =
    	@"<html>\n"
        "<head>\n"
    	"<script type=\"text/javascript\">\n"
    	
    	"function marktext(theSpanID)\n"
    	"{\n"
    	"	var theSpan=document.getElementById(theSpanID);\n"
    	"	if (theSpan.className == \"noHilite\")\n"
    	"	{\n"
    	"		theSpan.className = \"hilite\";\n"
    	"		window.location = \"true\";\n"
    	"	}\n"
    	"	else\n"
    	"	{\n"
    	"		theSpan.className = \"noHilite\";\n"
    	"		window.location = \"false\";\n"
    	"	}\n"
    	"}\n"
    	
    	"</script>\n"
    	
    	"<style type=\"text/css\">\n"
    	
    	".hilite\n"
    	"{\n"
    	"	background-color:red;\n"
    	"	color:white;\n"
    	"	font: bold 60px arial,sans-serif\n"
    	"}\n"
    	
    	".noHilite\n"
    	"{\n"
    	"	background-color:white;\n"
    	"	color:black;\n"
    	"	font: 60px arial,sans-serif\n"
    	"}\n"
    	
    	"</style>\n"
    	
        "</head>\n"
        "<body>\n"
    	"<div class=\"storyText\">\n";
    	
    	NSString *tailer = 
    	@"</div>\n"
        "</body>\n"
    	"</html>\n";
    	
    	HTMLText = [HTMLText stringByAppendingString:header];
    	for (NSInteger i = 0; i < [words count]; i ++)
    	{
    		NSString *tag = [NSString stringWithFormat:@"	<span id=\"mytext%d\" class=\"noHilite\" onclick=\"marktext(\'mytext%d\')\">%@</span>&nbsp;\n", i, i, (NSString *)[words objectAtIndex:i]];
    		HTMLText = [HTMLText stringByAppendingString:tag];
    	}
    	HTMLText = [HTMLText stringByAppendingString:tailer];
    	NSLog(HTMLText);
    	return HTMLText;
    }
    
    // The designated initializer. Override to perform setup that is required before the view is loaded.
    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    	if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
    		storyWebView.delegate = self;
    	}
    	return self;
    }
    
    // Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
    - (void)viewDidLoad
    {
        [super viewDidLoad];
    	NSString *HTMLData = [self contructHTMLText];
    	[storyWebView loadHTMLString:HTMLData baseURL:[NSURL URLWithString: @""]];	
    }
    
    - (void)didReceiveMemoryWarning {
        [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
        // Release anything that's not essential, such as cached data
    }
    
    - (void)dealloc {
        [super dealloc];
    }
    
    - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType 
    {	
    	// handle event here	
    	return true;
    }
    
    @end

Whats happening is that basically, the constructHTML function takes the text inside the *information variable and wraps every word in the text with some html and javascript such that whenever a word is clicked, a css high-lighting is applied on it. What I want to do is to count the number of high-lighted words. I do this by trying to pass something in the function thats called whenever a word is clicked but like i said, the shouldStartLoadWithRequest method thats supposed to be fired is never executed.

I've seen a lot of people do this sort of thing but I cant seem to figure out why its not running for me

I also tried putting storyWebView.delegate = self; inside a lot of other startup methods but nothing seems to work

tiois · 04-04-2011, 08:24 AM

Did you find the answer to this problem, I got the same problem...

Thanks!

**baja_yu** · 04-04-2011, 02:06 PM

Check the delegate in IB, it should be connected to the File's Owner.