What is Ext JS
Ext JS is a popular JavaScript framework which provide rich UI for building web applications with cross browser functionality. Ext JS is basically used for creating desktop applications It supports all the modern browsers as IE6+, FF, Chrome, safari 6+, opera 12+ etc. Whereas another product of sencha, sencha touch is used for mobile applications.Ext JS is based on MVC/ MVVM architecture. The latest version of Ext JS 6 is a single platform which can be used for both desktop and mobile application without having different code for different platform.
History
Ext JS 1.1
The first version of Ext JS was developed by Jack Slocum in 2006. It was a set of utility classes which is an extension of YUI. He named the library as YUI-ext.Ext JS 2.0
Ext JS version 2.0 was released in 2007. This version had new API documentation for desktop Application with limited features. This version doesn’t had backward compatibility with previous version of Ext JS.Ext JS 3.0
Ext JS version 3.0 was released in 2009. This version added new features as chart and list view but at the cost of speed. It had backwards compatible with version 2.0.Ext JS 4.0
After the release of Ext JS 3 the developers of Ext JS had the major challenge of ramping up the speed. Ext JS version 4.0 was released in 2011. It had the complete revised structure which followed by MVC architecture and a speedy application.Ext JS 5.0
Ext JS version 5.0 was released in 2014. The major change in this release was to change the MVC architecture to MVVM architecture. It includes the ability to build desktop apps on touch-enabled devices, two-way data binding, responsive layouts and many more features.Ext JS 6.0
Ext JS 6 merges the Ext JS (for desktop application) and sencha touch (for mobile application) framework.Features
These are the highlighted features of Ext JS- Customizable UI widgets with collection of rich UI such as Grids, pivot grids, forms, charts, trees.
- Code compatibility of new versions with the older one.
- A flexible layout manager helps to organize the display of data and content across multiple browsers, devices, and screen sizes.
- Advance data package decouples the UI widgets from the data layer. The data package allows client-side collection of data using highly functional models that enable features such as sorting and filtering.
- It is protocol agnostic, and can access data from any back-end source.
- Customizable Themes Ext JS widgets are available in multiple out-of-the-box themes that are consistent across platforms.
Benefits
Sencha Ext JS is the leading standard for business-grade web application development. Ext JS provides the tools necessary to build robust applications for the desktop and tablets.- Streamlines cross-platform development across desktops, tablets, and smartphones — for both modern and legacy browsers.
- Increases the productivity of development teams by integrating into enterprise development environments via IDE plugins.
- Reduces the cost of web application development.
- Empowers teams to create apps with a compelling user experience.
- It has set of widgets for making UI powerful and easy.
- It follows MVC architecture so highly readable code.
Limitations
- The size of library is large around 500 KB which makes initial loading time more and makes application slow.
- HTML is full of tags makes it complex and difficult to debug.
- According to general public license policy it is free for open source applications but paid for commercial applications.
- Some times for loading even simple things requires few lines of coding which is simpler in plain html or Jquery.
- Need quite experienced developer for developing Ext JS applications.
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