Question

I have a requirement where the objective C code should consume the WebService and the response received in JSON format has to be passed as an argument to a javascript method for further processing.I am using UIWebView which will display the appropriate results after processing JSON response.
The issue arises when i try to pass the JSON string to Javascript method.Javascript method does not simply accept the input.

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    NSString *responseString = [[NSString alloc] initWithBytes:[resultData bytes] length:[resultData length] encoding:NSUTF8StringEncoding];
    NSLog(@"%@",responseString);
    [self returnResponseToJavaScriptMethods:responseString];
}


-(void)returnResponseToJavaScriptMethods:(NSString*)theResponse{
    [viewMainWebView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"retrieveServerResponse('%@')",theResponse]];
}

Is there anything that I am missing out ?? Simple strings are getting passed properly using the same approach.

UPDATE :
Encoding the responseData to UTF8StringEncoding did the trick.

[theResponse stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]

Answer 1

You probably need to URL-escape the JSON string before posting it to the javascript.

Try to change:

-(void)returnResponseToJavaScriptMethods:(NSString*)theResponse{
  [viewMainWebView stringByEvaluatingJavaScriptFromString:
  [NSString stringWithFormat:@"retrieveServerResponse('%@')",theResponse]];
}

to

-(void)returnResponseToJavaScriptMethods:(NSString*)theResponse{
  [viewMainWebView stringByEvaluatingJavaScriptFromString:
  [NSString stringWithFormat:@"retrieveServerResponse('%@')",
 [theResponse stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]];
} 

And see if that helps you. Note, however, that there are better (or more surefire) ways to escape a string, for example the one given at this answer: How do I URL encode a string