Sencha Ext

Sencha Ext JS is a MVC-based JavaScript framework. This mobile app development tool offers a high level of responsiveness for the application. It helps to improve the customer satisfaction.

Sencha Architect is a visual development tool that can greatly boost your Sencha programming productivity. You can use it to rapidly create both Ext JS and Sencha Touch applications.


  • Developers can code in HTML5 format using Sencha touch software development kit
  • Its code can be translated with the help of another tool like PhoneGap
  • It is a useful tool for developing native apps without need of wasting any time on setup
  • It is currently supported on WebKit browsers, including the popular Apple iOS and Google Android platforms
  • Rationalized Configuration System
  • Allows to scale to various resolutions for maximum compatibility with different devices
  • Wide support for animations and enhanced touch events


  • ExtJS is like a superset of the widgets like simple label, textBox buttons to complex grids, drag-drop panel s etc. It also provides demo for remoting to invoke remote server methods.
  • It has quite good documentation with tutorials, samples and user community.
  • Active and currently most adopted javascript RIA framework
  • Good code quality/readability
  • Amazing set of widgets, does everything we could possibly want. Seems quick, every version brings new improvements.


  • Footprint - The library is 500 KB in size (using mod_gzip could be reduced to 150KB). Loading time would is high for home page on web.
  • CSS – very easy to get lost. It is difficult to find correct class names
  • HTML – full of divs and overly complex generated code. Difficult to debug even with FireBug.
  • Modified GPL 3.0 licensed. Free for open source applications but paid for commercial closed source applications.
  • Using ExtJs leads us to believe that the GUI would kind of desktop and rich. Customization is not easily achievable.
  • Loading even simple things requires few lines of coding which is simpler in plain html or jQuery.
  • Debugging is not very easy. Only GWT has bit better debugging in hosted mode among javascript frameworks.
  • It is not possible for the user to bookmark a certain page . Since the objects are rendered by DOM manipulation, page can not be indexed by search engines
  • Need quite experienced developer.
  • 1I'm not sure how to use this without the entire display being EXT.
  • ExtJS stands for Extended JavaScript. It is aJavaScript framework and a product of Sencha, based on YUI (Yahoo User Interface). It is basically a desktop application development platform with modern UI. This tutorial gives a complete understanding of Ext JS.
  • Ext.js is pure Javascript framework that is used for building interactive cross-platform web applications such as desktops, tablets, and smartphones using techniques like Ajax, DHTML and DOM scripting.
  • The key difference between MVC and MVVM is that MVVM features an abstraction of a View (the ViewModel) which manages the changes between a Model's data and the View's representation of that data (i.e. data bindings) — something which typically is cumbersome to manage in traditional MVC applications.

Here are the 5 best JavaScript Frameworks, which will surely catch the developer's eye.

  • AngularJS
  • React JS
  • Meteor JS
  • Backbone JS
  • Node JS.

What is ExtJS framework? Ext JS is a pure JavaScript application framework for building interactive cross platform web applications using techniques such as Ajax, DHTML and DOM scripting.

Express is a minimal and flexible Node.js web application framework that provides a robust set of features to develop web and mobile applications. It facilitates the rapid development of Node based Web applications. Following are some of the core features of Express framework.