How to Use the JavaScript Ext JS Library?

Ext JS is a JavaScript library for building cross-platform web applications with rich user interfaces. It provides a set of UI components, such as grids, trees, forms, and charts, as well as a framework for building and organizing your application.

Here’s an overview of the steps to use Ext JS:

1. Download and install Ext JS: You can download Ext JS from the Sencha website (https://www.sencha.com/products/extjs/). After downloading, extract the library files to your local system.
2. Include the Ext JS library in your HTML file: You need to include the Ext JS library in your HTML file to use it in your application. You can do this by adding the following script tags to your HTML file:

<link rel="stylesheet" type="text/css" href="path/to/extjs/resources/css/ext-all.css">
<script type="text/javascript" src="path/to/extjs/ext-all.js"></script>

3. Create a JavaScript file for your application: Create a new JavaScript file for your application, where you will write the code for your Ext JS application.
4. Create a viewport: Ext JS uses a concept called “viewport” to manage the layout of the application. A viewport is a container that takes up the entire browser window and can be divided into multiple regions, each of which can contain a different UI component. You can create a viewport using the Ext.Viewport class like this:

Ext.onReady(function () {
  Ext.create('Ext.container.Viewport', {
    layout: 'fit',
    items: [
      // Add your UI components here
    ]
  });
});

5. Add UI components to your viewport: You can add UI components, such as grids, trees, forms, and charts, to your viewport by adding them to the items array of the viewport. For example, you can add a grid to your viewport like this:

Ext.onReady(function () {
  Ext.create('Ext.container.Viewport', {
    layout: 'fit',
    items: [{
      xtype: 'grid',
      title: 'My Grid',
      columns: [
        // Add your grid columns here
      ],
      store: Ext.create('Ext.data.Store', {
        // Add your store configuration here
      })
    }]
  });
});

These are the basic steps to use Ext JS. You can explore the Ext JS documentation (https://docs.sencha.com/extjs/7.3.1/) for more information and examples on how to use the library to build your application.