Injection of JavaScript Functions Into a UIWebView Not working always

Question

I am working with a webapp in iPhone and I have problem with calling native methods from JavaScript.

I need a value which is in my viewController class, so that I am calling native method by using window.location and in shouldStartLoadWithRequest I can find which value is needed then I will send that value by using [webView stringByEvaluatingJavaScriptFromString:userId];

Based on this value, I need to call web services in native code. This time shouldStartLoadWithRequest is not firing. i.e simply "JS -> Native -> JS -> Native" in this case webView delegate not firing.

Would you please give me a solution for this.

could you post some code? perhaps on webView delegate?

HelmiB
– HelmiB

2012-03-03 13:00:34 +00:00
Commented Mar 3, 2012 at 13:00 — HelmiB
– HelmiB, Commented Mar 3, 2012 at 13:00

HelmiB · Accepted Answer · 2012-03-03 13:21:34Z

running web.html stored in Resource.

    NSString *path = [[NSBundle mainBundle] pathForResource:@"web" ofType:@"html"];
    NSString *jsCode = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

    [webView stringByEvaluatingJavaScriptFromString:jsCode];
    [webView setDelegate:self];
    [webView loadHTMLString:jsCode baseURL:nil];

in web.html, in body, you should have onload(), that will fire after webView start.

<html> <body> <head>

<script>

function anyFunction(){
    window.location='testing123';
}

</script>

</head><body onload="anyFunction();">
</body></html>

from there, you should be able to grab "testing123".

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType 
{
    NSString *data = [[[request URL] absoluteString] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    if ([data isEqualToString:@"testing123"])
        NSLog(@"value received");
}

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