Introduction

winalert.js is small wrapper for window.alert function, which will raise an winalert event whenever the client invokes the window.alert function.

Motivation

The primary motivation for this library, was to overcome the recent anouncement by Google Chrome where they have effectively stopped support for alert, confirm and prompt dialogs from being displayed in pages loaded in Iframe.

See Chrome update - Feature: Remove alert(), confirm(), and prompt for cross origin iframes for more information.

winalert event argument

winalertjs will raise a custom event winalert on the window object. The winalert event contains the following properties:

• detail - Contains the actual message passed to the window.alert
• getMessage() - helper function which will return the actual message passed to the window.alert

Usage

Add the winalert.js to your application

<script type="text/javascript" src="path-to-winalertjs-javascript-file.js"></script>

Activate winalert.js

winalertjs.activate();

By default, winalert events will be raised only for pages which are loaded inside Iframe only. If you want to raise the winalert for pages which are not loaded in Iframe also.

winalertjs.activate(true);

Register Event handler to listen to winalert event

// Use the event arguments for 'winalert', to get the message from the original ```window.alert``` invocation
window.addEventListener('winalert', function(earg) {
  console.log('winalert event handler ::: ' + earg.getMessage());
});