Environment Detection

Commonly when building applications that target mobile devices, you need to know specific information about the environment your application is running on. Perhaps the browser type, the device name, or if specific functionality is available for use. The environment package in Sencha Touch gives you an API which allows you to find out all this information.

Operating System

You can detect the operating system your application is running on using Ext.os.name. This returns one of the following values:

  • iOS
  • Android
  • webOS
  • BlackBerry
  • RIMTablet
  • MacOS
  • Windows
  • Linux
  • Bada
  • Other

You can also use the Ext.os.is singleton to check if the current OS matches a certain operating system. For example, if you wanted to check if the current OS is Android or Mac OS, you could use the following code:

if (Ext.os.is.Android) {
    // ...

if (Ext.os.is.MacOS) {
    // ...

You can also use it to detect if the device is an iPhone, iPad, or iPod using Ext.os.is as follows:

if (Ext.os.is.iPad) {
    // ...

The version of the OS can be also accessed using the following Ext.os.version call:

alert('You are running: ' + Ext.os.name + ', version ' + Ext.os.version.version);


You can also find information about the browser you are running your application on by using Ext.browser.name. The list of available values are the following:

  • Safari
  • Chrome
  • Opera
  • Dolfin
  • webOSBrowser
  • ChromeMobile
  • Firefox
  • IE
  • Other

You can also use Ext.browser.is to check if the current browser is one of the above values:

if (Ext.browser.is.Chrome) {
    // ...

The Ext.browser.is singleton also provides other useful information about the current browser that may be useful for your application:

  • Ext.browser.userAgent - returns the current userAgent
  • Ext.browser.isSecure - returns true if the current page is using SSL
  • Ext.browser.isStrict - returns true if the browser is in strict mode
  • Ext.browser.engineName - returns the browser engine name (WebKit, Gecko, Presto, Trident and Other)
  • Ext.browser.engineVersion - returns the version of the browser engine


You can use the Ext.feature singleton to check if a certain browser feature exists. For example, if you want to check if the browser supports canvas, you check use the following code:

if (Ext.feature.has.Canvas) {
    // ...

The available features are the following:

  • Ext.feature.has.Audio
  • Ext.feature.has.Canvas
  • Ext.feature.has.ClassList
  • Ext.feature.has.CreateContextualFragment
  • Ext.feature.has.Css3dTransforms
  • Ext.feature.has.CssAnimations
  • Ext.feature.has.CssTransforms
  • Ext.feature.has.CssTransitions
  • Ext.feature.has.DeviceMotion
  • Ext.feature.has.Geolocation
  • Ext.feature.has.History
  • Ext.feature.has.Orientation
  • Ext.feature.has.OrientationChange
  • Ext.feature.has.Range
  • Ext.feature.has.SqlDatabase
  • Ext.feature.has.Svg
  • Ext.feature.has.Touch
  • Ext.feature.has.Video
  • Ext.feature.has.Vml
  • Ext.feature.has.WebSockets
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