gistfile1.m

// This defines the functions i want to add to the javascript engine,
// like "alert" is commonly used in web-based js to show a popup window with text.
// So I create a js function called alert and add it to the engine's gobal object (window in browsers)
// Then I tell it to call the C function jsc_alert() when the developer uses the alert() command in a javascript file.


int JSConnectDefineGlobalFunctions(JSContext *context, JSObject *global) {
    static JSFunctionSpec global_funcs[] = {
        JS_FS("csystem", myjs_system, 1, 0, 0),
        JS_FS("alert", jsc_alert, 1, 0, 0),
        JS_FS("CreateView", jsc_createview, 1, 0, 0),
        JS_FS("include", jsc_include, 1, 0, 0),
        JS_FS("log", jsc_log, 1, 0, 0),
        JS_FS_END
    };
    
    if (!JS_DefineFunctions(context, global, global_funcs))
        return JS_FALSE;
    return JS_TRUE;
}

// This presents a UIAlertView. note: that's this window in iPhone dev: http://i.imgur.com/fynRleK.png
// It does it using native Objective-C to call the native function for iOS

JSBool jsc_alert(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) {

    NSString *message = [JSConnectUtil stringFromParam:argv withContext:cx];

    UIAlertView *a = [[UIAlertView alloc] initWithTitle:@"Alert" message:message delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
    [a show];
    [a release];
    return JS_TRUE;
}