”;
In this chapter, we will list down the steps to write the first Hello World program in Ext JS.
Step 1
Create an index.htm page in an editor of our choice. Include the required library files in the head section of html page as follows.
index.htm
<!DOCTYPE html>
<html>
<head>
<link href = "https://cdn.sencha.com/touch/sencha-touch-2.4.2/resources/css/sencha-touch.css" rel = "stylesheet" />
<script type = "text/javascript" src = "https://cdn.sencha.com/touch/sencha-touch-2.4.2/sencha-touch-all.js">
</script>
<script type = "text/javascript">
Ext.application( {
name: ''Sencha'', launch: function() {
Ext.create("Ext.tab.Panel", {
fullscreen: true, items: [{
title: ''Home'', iconCls: ''home'', html: ''Welcome to sencha touch''
}]
});
}
});
</script>
</head>
<body>
</body>
</html>
Explanation
-
Ext.application() method is the starting point of Sencha Touch application. It creates a global variable called ”Sencha” declared with the name property – all the Application”s classes such as its Models, Views and Controllers will reside under this single namespace, which reduces the chances of colliding global variables and file names.
-
launch() method is called once the page is ready and all the JavaScript files are loaded.
-
Ext.create() method is used to create an object in Sencha Touch. Here, we are creating an object of simple panel class Ext.tab.Panel.
-
Ext.tab.Panel is the predefined class in Sencha Touch for creating a panel.
-
Every Sencha Touch class has different properties to perform some basic functionalities.
Ext.Panel class has various properties such as −
-
fullscreen property is to make use of a complete screen, hence the panel will take fullscreen space.
-
items property is the container for various items.
-
iconCls is the class used for displaying different icons.
-
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.
”;