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).
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.
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.
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
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] )
Ques 6. How to get modified records using store object?
store.getModifiedRecords() : Gets all records modified since the last commit.
Ques 7. How to get record using index?
store.getAt( Number index ) : Get the Record at the specified index.
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.
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
Most helpful rated by users:
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