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ExtJS Interview Questions and Answers

Intermediate / 1 to 5 years experienced level questions & answers

Ques 1. What are major Web browsers supported by Ext JS framework?

* Windows® Internet Explorer® version 6 and later.
* Mozilla Firefox version 1.5 and later (PC and Macintosh).
* Apple Safari version 2 and later.
* Opera version 9 and later (PC and Mac).

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Ques 2. Where ExtJS extended from?

Ext JS as a project to extend the functionality that the YUI Library.A key aspect of the YUI Library is the cross-browser support.The Extjs framework is fully object oriented and extensible. Because it's written in the JavaScript language.

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Ques 3. Extjs Ajax implementation?

A typical Ext JS Ajax implementation: an HTML text field and button element that posts data in the text field to a Web server when the button is clicked.

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Ques 4. 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 5. What is the purpose of each() in store?

Calls the specified function for each of the Records in the cache
each( Function fn, [records Object] )

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Ques 6. How to get modified records using store object?

store.getModifiedRecords() : Gets all records modified since the last commit.

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Ques 7. How to get record using index?

store.getAt( Number index ) : Get the Record at the specified index.

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Ques 8. What is purpose of loadData() in store?

store.loadData( Object data, [Boolean append] ) : void
Loads data from a passed data block and fires the load event.
loadData(storeData,false); False to replace the existing records cache.
loadData(storeData,true) : True to append the new Records rather than replace the existing cache.

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Ques 9. What is vtype?

The validations provided are basic and intended to be easily customizable and extended.
Few vtypes provided by extjs are as below:
emailText : String, The error text to display when the email validation function returns false
alphanumText : String, The error text to display when the alphanumeric validation function returns false
urlText : String, The error text to display when the url validation function returns false

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