UIWebView: Can I disable the javascript alert() inside any web page?

Question

I am using UIWebView to load a URL.

Inside the page of that URL, it uses alert("whatever msg") as JavaScript. My UIWebView will pop up a window and show that alert message.

Is there a way to disable this kind of popup window or JavaScript alert window?

Answer 1

Add this after your web view has loaded its content

[MyWebView stringByEvaluatingJavaScriptFromString:@"window.alert=null;"];

Answer 2

You can bind window.alert to another function. So:

window.alert = function() {
  //does nothing so effectively "disables" alert
};

Make sure you do this before you call any alerts. The neat thing about this is you can customize the way you display messages to the user. So you could override window.alert to log to the console (for debugging purposes) or you can render it on the page (with a lightbox or something similar).