Disable popups and alertboxes in android webview

Question

I am using webview with javascript enables since it is required in my app fulltime. My issue is that I need to avoid popups while loading url\'s in my webview is there a way

Answer 1

You could try overriding alert,confirm, etc. Maybe add a flag on when to allow and when not to allow the alert to show. JavaScript: Overriding alert()

Answer 2

I tried the approach described in the accepted answer, from Kalel Wade, and by injecting JavaScript on every progress event I was able to block popups. However, I found what appears to be a much more elegant approach.

If you extend WebChromeClient, you can override its onJsAlert() method and block the built-in handler for alerts. While you're at it, you will probably want to block calls to confirm() and prompt():

WebChromeClient webChromeClient = new WebChromeClient() {
    @Override
    public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
        result.cancel();
        return true;
    }

    @Override
    public boolean onJsConfirm(WebView view, String url, String message, JsResult result) {
        result.cancel();
        return true;
    }

    @Override
    public boolean onJsPrompt(WebView view, String url, String message, String defaultValue, JsPromptResult result) {
        result.cancel();
        return true;
    }
};

webView.setWebChromeClient(webChromeClient);

Given that you're seeing JavaScript alerts, I believe you must have already assigned a WebChromeClient. (If you don't do so, alerts are not supported.) So it should just be a matter of adding the overrides above.

Be sure to call result.cancel() prior to returning. From my experience, if you don't do this, the JavaScript engine seems to hang; the button stays in the pressed state, and no subsequent interaction is registered.