iOS WKWebView not showing javascript alert() dialog - Stack Overflow

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I am having some trouble getting a WKWebView in iOS 8 to display an alert dialog that is called from Javascript. After creating a standard WKWebView and loading an HTML file, I have a button on the page that creates a simple alert with some text. This works in UIWebView and in Google Chrome/Safari, but does not appear to be working in WKWebView. Any help is appreciated.

My setup is as follows:

WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
config.allowsInlineMediaPlayback = YES;
config.mediaPlaybackRequiresUserAction = false;
_wkViewWeb = [[WKWebView alloc] initWithFrame:_viewWeb.frame config];
_wkViewWeb.scrollView.scrollEnabled = NO;
NSString *fullURL = @"file://.../TestSlide.html";
NSURL *url = [NSURL URLWithString:fullURL];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];

[_wkViewWeb loadRequest:request];

The html has the following function:

<SCRIPT Language="JavaScript">
function alertTest() {
    alert("Testing Alerts");
}
</SCRIPT>

And a button:

<b>Test Alerts: <input type="button" value="Alert Popup" onclick="alertTest()"><br></b> <br>

This setup works in UIWebView and in regular browsers, but does not work in WKWebView. Am I missing something in the configuration? Should I be using one of the WK delegates to control the alert/confirm dialog behavior? Thank you.

I am having some trouble getting a WKWebView in iOS 8 to display an alert dialog that is called from Javascript. After creating a standard WKWebView and loading an HTML file, I have a button on the page that creates a simple alert with some text. This works in UIWebView and in Google Chrome/Safari, but does not appear to be working in WKWebView. Any help is appreciated.

My setup is as follows:

WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
config.allowsInlineMediaPlayback = YES;
config.mediaPlaybackRequiresUserAction = false;
_wkViewWeb = [[WKWebView alloc] initWithFrame:_viewWeb.frame config];
_wkViewWeb.scrollView.scrollEnabled = NO;
NSString *fullURL = @"file://.../TestSlide.html";
NSURL *url = [NSURL URLWithString:fullURL];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];

[_wkViewWeb loadRequest:request];

The html has the following function:

<SCRIPT Language="JavaScript">
function alertTest() {
    alert("Testing Alerts");
}
</SCRIPT>

And a button:

<b>Test Alerts: <input type="button" value="Alert Popup" onclick="alertTest()"><br></b> <br>

This setup works in UIWebView and in regular browsers, but does not work in WKWebView. Am I missing something in the configuration? Should I be using one of the WK delegates to control the alert/confirm dialog behavior? Thank you.

• javascript
• ios
• wkwebview

Share Improve this question Follow asked Nov 12, 2014 at 23:55 CharlieCharlie 84311 gold badge66 silver badges55 bronze badges 2

• can u try hosting the html file and try "http://" instead of "file://", it may be because of this bug in wkwebview: openradar.me/radar?id=5839348817723392 – krisrak Commented Nov 13, 2014 at 19:21
• The html files are stored locally so they can be accessed offline. The file loads without an issue, its only the alert dialog that does not display when the button is tapped. – Charlie Commented Nov 13, 2014 at 23:04

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7 Answers 7

Sorted by: Reset to default 95

To solve this you need a WKUIDelegate for your web view. It is the duty of the delegate to decide if an alert should be displayed, and in what way. You need to implement this for alert, confirm and text input (prompt).

Here is sample code without any validation of the page url or security features:

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message
                                                                             message:nil
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"OK"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler();
                                                      }]];
    [self presentViewController:alertController animated:YES completion:^{}];
}

More in the Official Documentation

Swift 3 with all 3 optional functions implemented:

func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping () -> Void) {

    let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)
    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        completionHandler()
    }))

    present(alertController, animated: true, completion: nil)
}


func webView(_ webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping (Bool) -> Void) {

    let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)

    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        completionHandler(true)
    }))

    alertController.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
        completionHandler(false)
    }))

    present(alertController, animated: true, completion: nil)
}


func webView(_ webView: WKWebView, runJavaScriptTextInputPanelWithPrompt prompt: String, defaultText: String?, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping (String?) -> Void) {

    let alertController = UIAlertController(title: nil, message: prompt, preferredStyle: .actionSheet)

    alertController.addTextField { (textField) in
        textField.text = defaultText
    }

    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        if let text = alertController.textFields?.first?.text {
            completionHandler(text)
        } else {
            completionHandler(defaultText)
        }
    }))

    alertController.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
        completionHandler(nil)
    }))

    present(alertController, animated: true, completion: nil)
}

Just to expand a bit, WKWebView requires you to show alerts, prompts, and confirms yourself. Do this by becoming a WKUIDelegate:

#import <WebKit/WebKit.h>
@interface MyController : UIViewController<WKUIDelegate>

Then assign the delegate:

web.UIDelegate = self;

Then you need to actually implement alert, prompt, and confirm. I create WKWebViewPanelManager.h/m as an easy implementation, so here's what I do:

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    [WKWebViewPanelManager presentAlertOnController:self.view.window.rootViewController title:@"Alert" message:message handler:completionHandler];
}

- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler {
    [WKWebViewPanelManager presentConfirmOnController:self.view.window.rootViewController title:@"Confirm" message:message handler:completionHandler];
}

- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler {
    [WKWebViewPanelManager presentPromptOnController:self.view.window.rootViewController title:@"Prompt" message:prompt defaultText:defaultText handler:completionHandler];
}

Of course, it's up to you to filter out bad alert/confirm/prompt requests.

And here's that in swift:

func webView(webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String,
             initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {

    let alertController = UIAlertController(title: message,
                                            message: nil,
                                            preferredStyle: .alert)

    alertController.addAction(UIAlertAction(title: "OK", style: .cancel) {
        _ in completionHandler()}
    )

    self.present(alertController, animated: true, completion: nil)
}

1. Implement the protocol to your WKWebview container controller. WKUIDelegate

2. Add preference to WKWebview to enable javascript in viewDidLoad() as.

   // enable JS
   webView.configuration.preferences.javaScriptEnabled = true
   

3. Register WKWebview UI Delegate in viewDidLoad() as

   self.webView.uiDelegate = self
   

4. Implement the below delegate in your class.

   func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: 
   String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> 
   Void) {
   let alertController = UIAlertController(title: message,message: nil,preferredStyle: 
   .alert)
   
   alertController.addAction(UIAlertAction(title: "OK", style: .cancel) {_ in 
   completionHandler()})
   
   self.present(alertController, animated: true, completion: nil)
   }
   

Here is the code in Swift 4.2

func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String,
             initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {

    let alertController = UIAlertController(title: message, message: nil,
                                            preferredStyle: UIAlertController.Style.alert);

    alertController.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.cancel) {
        _ in completionHandler()}
    );

    self.present(alertController, animated: true, completion: {});
}

1. The viewController

ViewController: UIViewController, WKUIDelegate, WKNavigationDelegate 

2. Enable JavaScript

webView.configuration.preferences.javaScriptEnabled = true

3. In the ViewDidLoad() Function add the below items

   webView.uiDelegate = self
   webView.navigationDelegate = self
   view.addSubview(webView)

4. Add the delegate as follows

    func webView(_ webView: WKWebView,
                 runJavaScriptAlertPanelWithMessage message: String,
                 initiatedByFrame frame: WKFrameInfo,
                 completionHandler: @escaping () -> Void) {
        
        let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)
        let title = NSLocalizedString("OK", comment: "OK Button")
        let ok = UIAlertAction(title: title, style: .default) { (action: UIAlertAction) -> Void in
            alert.dismiss(animated: true, completion: nil)
        }
        alert.addAction(ok)
        present(alert, animated: true)
        completionHandler()
    }

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