Question

198

iOS UIWebView Javascript - insert data -receive callbacks?

rated 0 times [ 200] [ 2] / answers: 1 / hits: 20856 / 13 Years ago, fri, october 7, 2011, 12:00:00

I have a webpage. I have a javascript file that does a whole lot of stuff. In the app I have an NSString with some crucial data that needs to be processed in the javascript file. How do I get my string value into a certain place in my html so my javascript can read it?

Also, the javascript will produce certain data when actions are performed (like pressing a button), how do I retrieve the data from the webview/javascript so it can be stored in the app?

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jovanymarshalld

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3 Years ago

answered 13 Years ago brodyfrancisi · Accepted Answer

You can call a javascript method and pass the value by using this

NSString *selectedValue = [webViewInstance stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@getAndReturnRadioValue(%d), questionCounterIntValue]];

But to trigger back from javascript you need to use a workaround method,

Implement the following webViewDelegate method

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{



    NSLog(@passed data from web view : %@,[[request URL] query]);



    if([[[request URL] query] isEqualToString:@clickedOnLineNo])

    {

        //Do your action here    

    }

}

You have to navigate to a fake URL from your javascript method like,

window.location = someLink://yourApp/form_Submitted:param1:param2:param3;

on a button click or your required action.

You could take a look at my answer for this question
Submit a form in UIWebView