asp.net - Get textbox text in Javascript -


i have textbox accepts date values 01-01-2013. need year in javascript. code have used:

var oldrange, aoldrange;   var newrange, anewrange;   aoldrange = new array();   anewrange = new array();   var oldyear, newyear;   oldrange = document.getelementbyid(                        '<%= txtacademicyearstartdate.clientid%>').value; aoldrange = oldrange.split("-"); oldyear = aoldrange[2];

but value undefined. what's issue?

you have defined aoldrange, refering oldyear = aoldrange[2]

try 

oldyear = aoldrange[2]

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