Dropdownlist selected value in asp.net 4.5 using Javascript -


i using external javascript file give me message when dropdown list value not selected. set 'select' default. have tried lot of things found while searching, not running on site. using visual studio 2013 4.5 frame work.

below code have tried.

function unicollege() {      var ddlobject = document.getelementbyid("<%=ddltype.clientid%>");      var selectedvalue = ddlobject.options[ddlobject.selectedindex].value;       var e = document.getelementbyid("ddllocation");       var selectedlocation = e.options[e.selectedindex].value;       // .option , .value property not available in program.  }

here needs in page use external javascript file:

     protected void page_load(object sender, eventargs e)      {         scriptmanager.registerclientscriptinclude(         this,         typeof(page),         "",         resolveclienturl("javascript1.js"));      }

in aspx markup use variable ddl reference in external javascript file:

    <script type="text/javascript">        var ddl = "<%=ddllist.clientid%>";     </script>

and in external javascript file:

    /// <reference path="webform1.aspx" />      function unicollege() {      var ddlobject = document.getelementbyid(ddl);     var selectedvalue = ddlobject.options[ddlobject.selectedindex].value;     }

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