.net - how to disable the save button -


I have a month's drop down and save button, I want to disable the saving button if the month was down from the drop down value In the asp.net webpage, selected as the previous month

If this is the only option to select There is a regular dropdown with, Onchange-function can be shortend 

  function checkDate () {var doc = document; Var btn = doc.getElementById ('& lt;% = btnSave.ClientID% & gt;'); Var SLC = doc.getElementById ('& lt;% = ddlMonths.ClientID% & gt;'); Btn.disabled = (slc.selectedIndex & lt; (new date ()). GetMonth ()); }

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