Ques 17. What is method to Update the message box body text for MessageBox?
updateText( [String text] ) : Ext.MessageBox
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Ques 18. What is a widget?
A widget is a tiny piece or component of functionality.
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Ques 19. What is parent class for all stores in extjs? how many stores exists?
Ext.data.Store is parent class for all stores. A Store object uses its configured implementation of DataProxy to access a data object unless you call loadData directly and pass in your data. subclasses for Store: GroupingStore, JsonStore, SimpleStore
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Ques 20. How to handle event for a extjs component?
1) Using listeners config object. For ex for grid events : listeners: {rowclick: gridRowClickHandler,rowdblclick: gridRowDoubleClickHandler} 2) Using addListener( String eventName, Function handler, [Object scope], [Object options] ) : void Appends an event handler to this component 3) Using on( String eventName, Function handler, [Object scope], [Object options] ) : void Appends an event handler to this element (shorthand for addListener) For ex: store.on( "datachanged", function( store ){ ..... });