Hello Readers,

In order to call javascript functions within webview,following code snippet may be used:

Specify path of the html file which contains the javascript function:

NSString *path;
NSBundle *bundle = [NSBundle mainBundle];
path = [bundle pathForResource:@"FileName" ofType:@"html"]; 

//Form the url with the path and load it in webview

NSURL *fileUrl = [NSURL fileURLWithPath:path];
[webViewVariable loadRequest:[NSURLRequest requestWithURL:fileUrl]];

//Call the javascript function here

 NSString * funcCall = [NSString stringWithFormat:@"functionTest()"];// Name of the function that needs to be called goes here
[webViewOutlet stringByEvaluatingJavaScriptFromString:funcCall];

In swift the following code can be used:
       

 var path : NSString;
 var bundle = NSBundle.mainBundle()
 path = bundle.pathForResource("FileName", ofType: "html")!
 var fileUrl = NSURL.fileURLWithPath(path as String)
 var request =  NSURLRequest(URL: fileUrl)
 webViewOutlet.loadRequest(request)
 var funcCall = NSString(format:"functionTest()")
 webViewOutlet.stringByEvaluatingJavaScriptFromString(funcCall as String)