jquery - javascript input field get cleared when page postback -


i working vb asp.net , end sql in have choose date calendar used javascript calendar client side coding , other controls , when page postback lost calendar value selected have keep date till click save button here textbox input 

<input name="txtpodate" id="inputfield00" type="text"                         style="width:28px; font-family:segoe ui; font-size:14pt; height: 20pt; background-color: #3366ff;"                         onclick ="a();" />

i have used hidden field , onblur , onfocus events not working,

the calendar function is

    <link rel="stylesheet" type="text/css" media="all" href="jsdatepick_ltr.min.css" />  <script type="text/javascript" src="jsdatepick.min.1.3.js" ></script>   <script type="text/javascript" id ="calender">          function setcurrentdate() {              var d = new date();             var month = new array();             month[0] = "jan";             month[1] = "feb";             month[2] = "mar";             month[3] = "apr";             month[4] = "may";             month[5] = "jun";             month[6] = "jul";             month[7] = "aug";             month[8] = "sep";             month[9] = "oct";             month[10] = "now";             month[11] = "dec";              var mnth = month[d.getmonth()];             var convertedstartdate = new date();             var day = convertedstartdate.getdate();             var year = convertedstartdate.getfullyear();             var shortstartdate = day + "-" + mnth + "-" + year;             document.getelementbyid("inputfield00").text = shortstartdate;            document.getelementbyid("inputfield").value = shortstartdate;            document.getelementbyid("inputfield0").value = shortstartdate;           }   function a() {              new jsdatepick({                 usemode: 2,                 target: "inputfield00",                 dateformat: "%d-%m-%y"               });              new jsdatepick({                 usemode: 2,                 target: "inputfield",                 dateformat: "%d-%m-%y"              });             new jsdatepick({                 usemode: 2,                 target: "inputfield0",                 dateformat: "%d-%m-%y"              });              setcurrentdate();          };         </script>                 </asp:content>

can me?

modify input tag below add runat=server

<input runat="server" name="txtpodate" id="inputfield00" type="text"                         style="width:28px; font-family:segoe ui; font-size:14pt; height: 20pt; background-color: #3366ff;"                         onclick ="a();" />

then edit script new generated clientid input field

in

document.getelementbyid("<%= inputfield00.clientid  %>").text = shortstartdate;

and 

new jsdatepick({                 usemode: 2,                 target: "<%= inputfield00.clientid  %>",                 dateformat: "%d-%m-%y"             });

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