Ext.js - First Program


This chapter lists down the steps to write the first Hello World program in Ext JS.

Step 1

Create an index.htm page in the editor of our choice. Include the required library files in the head section of html page as follows.


<!DOCTYPE html>
      <link href = "https://cdnjs.cloudflare.com/ajax/libs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css" 
         rel = "stylesheet" />
      <script type = "text/javascript" 
         src = "https://cdnjs.cloudflare.com/ajax/libs/extjs/6.0.0/ext-all.js"></script>
      <script type = "text/javascript">
         Ext.onReady(function() {
            Ext.create('Ext.Panel', {
               renderTo: 'helloWorldPanel',
               height: 200,
               width: 600,
               title: 'Hello world',
               html: 'First Ext JS Hello World Program'
      <div id = "helloWorldPanel" />


  • Ext.onReady() method will be called once the Ext JS is ready to render the Ext JS elements.

  • Ext.create() method is used to create an object in Ext JS. Here we are creating an object of simple panel class Ext.Panel.

  • Ext.Panel is the predefined class in Ext JS for creating a panel.

  • Every Ext JS class has different properties to perform some basic functionalities.

Ext.Panel class has various properties such as −

  • renderTo is the element where this panel has to render. 'helloWorldPanel' is the div id in Index.html file.

  • Height and width properties are for customizing the size of the panel.

  • Title property is to provide the title to the panel.

  • Html property is the html content to be shown in the panel.

Step 2

Open the index.htm file in a standard browser and you will get the following output on the browser.