UIWebView not calling my Javascript function

Question

I am aware that this question is already posted lot many times. But none of them are helping me to solve my issue. Please consider reading entire question before downvote :-)

So, for I have below lines of code

- (void)viewDidLoad {
    [super viewDidLoad];
    NSURL * url = [NSURL URLWithString: @"https://www.w3schools.com/code/tryit.asp?filename=FEGU9IV4SAK8"];

    NSURLRequest * request = [NSURLRequest requestWithURL:url];

    self.webView.delegate = self;
    [self.webView loadRequest:request];
}

#pragma mark - UIWebView Delegates

- (void) webViewDidFinishLoad:(UIWebView *)webView {

    NSString * jsString = [NSString stringWithFormat:@"test()"];
    [webView stringByEvaluatingJavaScriptFromString:jsString] ;


//This code is working. Able to prompt "Hello"    
//     jsString = [NSString stringWithFormat:@"alert('Hello');"];
//    [webView stringByEvaluatingJavaScriptFromString:jsString] ;
}

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

   // ignore legit webview requests so they load normally
    if (![request.URL.scheme isEqualToString:kSchemeName]) {
        return YES;
    }


    // look at the actionType and do whatever you want here
    if ([actionType isEqualToString:kJSActionForPay]) {

        //Call objective-c method - Success 
    }

    // make sure to return NO so that your webview doesn't try to load your made-up URL
    return NO;
}

So, Far I have tried / understood.

[1] Call JS function only after web view loaded. (used delegate)

[2] Able to prompt "Hello" from

[webView stringByEvaluatingJavaScriptFromString:@"alert('Hello')"] ;

[3] Changes done in HTML side

<!DOCTYPE html>
<html>
<head>
  <title>Page Title</title>
</head>
<body>
<h1 id="id1">My Heading 1</h1>
<button type="button" 
onclick="document.getElementById('id1').style.color = 'red'">
Click Me!</button>
</body>
     <script> 
      function test() {
        alert("Started");
     }
     </script>
</html>

Please help to find out what I am missing in HTML Side ? or In my native Objc?

EDIT 1: As @Andy suggested, I loaded html from local. Then I am able to call JS function "test()"

does this help at all ? stackoverflow.com/questions/14334047/… — Andy Donegan
– Andy Donegan, Commented Apr 9, 2017 at 16:20
@AndyDonegan Yes, it does !!! It calls JS when html loaded from Local. — Jeek Axio
– Jeek Axio, Commented Apr 9, 2017 at 16:50

chengsam · Accepted Answer · 2017-04-09 16:26:40Z

0

You should not use the w3schools editor to be the source html for your project. The url you tried to visit not only contains your content but also the scripts used by w3schools. Instead, you should put your html file on your own server or a .html file inside your project. Then, you can call the test() method.

answered Apr 9, 2017 at 16:26

chengsam

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1 Comment

Jeek Axio Over a year ago

Hey @chengsam, you are right ! It works when the same html loaded from loal( main bundle) Thanks

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