Restrict Duplicate In DropdownList?

Jun 30, 2010

I am having a table with rows created using a button click event. While adding rows to the table, I create drop dowlist using

Code:
objVehicles = document.createElement("<SELECT class='dropdownbox' id=Vehicles"+objAlertRowId+" name=Vehicles"+objAlertRowId+" STYLE='width:148px'; onchange='setDataChanged();toggleEditButton(" + objAlertRowId+ ",this.value);' >");
objNewRow.cells.item(3).appendChild(objVehicles);

And the output will be like the attached screen shot.

The control name as Vehicles0,Vehicles1 and so on Now I want to restrict that the the user select no duplicates from the List.

What logic I can implement ?

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Javascript
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[Code]...

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[Code]....

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