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> \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
