How can I call Objective-C methods from JavaScript?

Question

I want to display SQLite Data base content on UIWebView. For that i have a local HTML file. On Body load in html file calling JavaScript Function. Inside the Java Script how to call Objective-c method. how to get Data from Objective c to Java Srcipt.

<html>
    <head>
        <!-- a script inline --> 
        <script language="JavaScript" TYPE="text/javascript">
            <!--
            function myJsFunc() 
            { 

                //here i want to call objective-c methods.

            } 
            // -->
            </script>
        </head>
    <Body Bgcolor=#800000 onload="myJsFunc(); return true;">

        </Body>
</html>

Objective-C code ......

- (void)viewDidLoad
{
        [super viewDidLoad];
        NSString *path;
    NSBundle *thisBundle = [NSBundle mainBundle];
    path = [thisBundle pathForResource:@"Demo" ofType:@"html"];

    // make a file: URL out of the path
    NSURL *instructionsURL = [NSURL fileURLWithPath:path];
    [myWebView loadRequest:[NSURLRequest requestWithURL:instructionsURL]];
    [self.view addSubView:myWebView];
}
-(NSArray*)FetchingDataFromDataBase{

    // Code for retriving data from SQlite data Base, and return NSArray;
    return myArray;
}

Inside the Function myJSFunc(), how can call -(NSArray*)FetchingDataFromDataBase.

Take a look at this blog post: blog.techno-barje.fr/post/2010/10/06/… — graver
– graver, Commented Apr 18, 2012 at 9:45
The language attribute on script elements has been deprecated for more than a decade, you can leave it off now. The type attribute should be in lower case, but frankly, you don't need it unless you're including a script not written in JavaScript (this is one of the areas where the HTML5 spec is just codifying existing practice, rather than dictating something new). — T.J. Crowder
– T.J. Crowder, Commented Apr 18, 2012 at 9:46

zolio · Accepted Answer · 2012-04-23 01:50:47Z

1

The blog post given by graver explains it how to do it.

- (BOOL)webView:(UIWebView *)webView2 
      shouldStartLoadWithRequest:(NSURLRequest *)request 
      navigationType:(UIWebViewNavigationType)navigationType

If you have the above method in your class, this method will be called before a new page is loaded. Only if this method returns YES, the new load request is processed. We use that mechanism to communicate back to the Objective-C functions.

answered Apr 23, 2012 at 1:50

zolio

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Musthafa Over a year ago

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