check to see if object has a property value code example
Example 1: how to check wether the property exist in a object in java script
if (obj.hasOwnProperty('prop')) {
// do something
}
Example 2: javascript does object have property
var person = {'first_name': 'bill','age':20};
if ( person.hasOwnProperty('first_name') ) {
//person has a first_name property
}