How can i prevent duplicate entry in java script while appending data into #div

Question

PFB java script code..

the thing is im getting alert for duplicate entry. how can avoid the repeated data?

Var   activityconunt =0;     
  if (activityconunt !== data.iRoundId) {
        alert("duplicate");
        $("#selectRound_Type").append("<option name='round' id=" + data.iRoundId + ">" + data.strRoundName + "</option>");             
        }

my output

Answer 1

Solution one:

Take your data and build a clean array before. Using http://api.jquery.com/jquery.inarray/

Solution two:

Check your existing options for containing values

if($("option:contains('" + data.strRoundName + "')").length == 0)
    $("#selectRound_Type").append("<option name='round' id=" + data.iRoundId + ">" + data.strRoundName + "</option>");

this should do it as well and is a shorter code

also see Fiddle