CODEWITHSUNDEEP
javascript
Ahmed
Ahmed

Reputation: 19

Java Script: Uncaught TypeError: Cannot read property 'value' of undefined

I am sorry if I this questions is duplication, I have read all the Q & A in the site regarding but did not find the answer.

I am getting the error message Uncaught TypeError: Cannot read property 'value' of undefined. The funny thing is this is coming for only 1 client. I have created a place where we can enter arrival and departure information of client but once when we are adding the one client it is coming for others it is working fine. I have checked in all the computers in my office but still I can not add Mr. XYZ to arrival list.

This is the line

var fldQPRArrivalFlightID=document.getElementsByName('fldQPRArrivalFlightID['+fldCustomerReservationID+']['+mycount+']')[0].value;

Upvotes: 0

Views: 641

Answers (1)

EricG
EricG

Reputation: 3849

the method getElementsByName(..) doesnt return an array - or an empty array. Therefore, getElementsByName(..)[0] is undefined and you'll receive the error.

You can try logging the returnvalue of 'fldQPRArrivalFlightID['+fldCustomerReservationID+']['+mycount+']' and verify what the invocation of getElementsByName( returnvalue ) should return.

Instead of your code:

fldQPRArrivalFlightID=document.getElementsByName('fldQPRArrivalFlightID['+fldCustomerReservationID+']['+mycount+']')[0].value;

Try

console.log( fldCustomerReservationID );
console.log( mycount );
console.log( 'fldQPRArrivalFlightID['+fldCustomerReservationID+']['+mycount+']' );
console.log( document.getElementsByName('fldQPRArrivalFlightID['+fldCustomerReservationID+']['+mycount+']') );

I'm actually surprised all this quoting goes right.

Upvotes: 1

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