在 UIWebView 和 WkWebview 中禁用 javascript 警报？

Question

As mentioned in this example for Android: Disable popups and alertboxes in android webview

WebChromeClient can be used to block javascript alerts.

Can someone provide a similar example for blocking window.alert|window.confirm|window.prompt javascript alerts in iOS WebViews & WkWebViews?

Answer 1

in wkwebview this is implicit. A js alert fires a delegate call only. an alert would have to be triggered by the objc/swift code

Answer 2

@roshabh Yes,I just meet the same question, you must use UIDelegate methods of WKWebview to show the alert/conform/prompt effect. code eg:

webview?.uiDelegate = self

extension MessageNoticeViewController: WKUIDelegate {

func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {
    let alertController = UIAlertController(title: nil, message: message, preferredStyle: .alert)

    alertController.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: ""), 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: .alert)

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

    alertController.addAction(UIAlertAction(title: NSLocalizedString("cancel", comment: ""), 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: .alert)

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

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

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

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

}