javascript - what is this ext.js's "xtype: 'app-main'" -


newbie ext.js: trying understand this:

xtype: 'app-main'

means in auto generated code. no documentation available. guess reference me alias, not find it..

i used sencha cmd (latest may 2014 - ext.js 4.2.2) autogenerated number of files, had xtype: 'app-main' in them...

main.js

ext.define('test12.view.main', {     extend: 'ext.container.container',     requires:[         'ext.tab.panel',         'ext.layout.container.border'     ],      xtype: 'app-main',    <<<<-------      layout: {         type: 'border'     },      items: [{         region: 'west',         xtype: 'panel',         title: 'west',         width: 150     },{         region: 'center',         xtype: 'tabpanel',         items:[{             title: 'center tab 1'         }]     }] });

viewport.js 

ext.define('test12.view.viewport', {     extend: 'ext.container.viewport',     requires:[         'ext.layout.container.fit',         'test12.view.main'     ],      layout: {         type: 'fit'     },      items: [{         xtype: 'app-main'     }] });

xtype config allow instantiate classes define more easily

example: 

ext.define('myapp.view.mycoolpanel',{     extend : 'ext.panel.panel',     xtype  : 'coolpanel',     //some cool configs ...   }); //somewhere else  ext.create('ext.window.window',{     //regular configs      items: [     {       xtype: 'coolpanel'      } ] }).show();

see http://docs.sencha.com/extjs/4.2.2/#!/api/ext.panel.panel-cfg-xtype

best regards


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