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ExtJS Interview Questions and Answers

Ques 21. How to find no of records in a store?

Using 

store.getCount() : Gets the number of cached records.
store.getTotalCount() : Gets the total number of records in the dataset as returned by the server.

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Ques 22. How to handle exception while loading datastore?

Using loadexception event.
syntax: store.loadexception() : Fires if an exception occurs in the Proxy during loading.
use beforeload : ( Store this, Object options ) : Fires before a request is made for a new data object. If the beforeload handler returns false the load action will be canceled.
syntax:
store.on('loadexception', function(event, options, response, error) {
alert("Handling the error");
event.stopEvent();
});

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Ques 23. How to handle updates for store changes?

Use store.commitChanges()

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Ques 24. 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 25. How to get modified records using store object?

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

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