Ready, set, go!
In this section, we'll look at the onReady event—the first thing that you need to deal with when you are working with Ext. We will also see how to display some different types of dialogs, and how to respond to the users' interaction with those dialogs. Before we get to that, we need to cover some ground rules about working with Ext.
Before we proceed any further, we should provide Ext with something it needs—a spacer image. Ext needs a 1 pixel by 1 pixel, transparent, GIF image to stretch in different ways, giving a fixed width to its widgets. We need to set the location of this spacer image using the following line:
Ext.onReady(function(){
Ext.BLANK_IMAGE_URL = 'images/s.gif';
});
You're probably wondering why we need a spacer image at all. The user interface of Ext is created using CSS, but the CSS needs underlying HTML elements to style so that it can create the look and feel of Ext components. The one HTML element that...