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Editorial Team
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Asked: 2026-06-12T07:57:07+00:00

I have this code: <html> <head> <script type=text/javascript> /*********************************************** * Drop Down Date select

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I have this code:

<html>
<head>

<script type="text/javascript">

/***********************************************
* Drop Down Date select script- by JavaScriptKit.com
* This notice MUST stay intact for use
* Visit JavaScript Kit at http://www.javascriptkit.com/ for this script and more
***********************************************/

var monthtext=['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sept','Oct','Nov','Dec'];

function populatedropdown(dayfield, monthfield, yearfield){
     var today=new Date()
     var dayfield=document.getElementById(dayfield)
     var monthfield=document.getElementById(monthfield)
     var yearfield=document.getElementById(yearfield)
     for (var i=0; i<31; i++)
         dayfield.options[i]=new Option(i, i+1)
     dayfield.options[today.getDate()]=new Option(today.getDate(), today.getDate(), true, true) //select today's day
     for (var m=0; m<12; m++)
         monthfield.options[m]=new Option(monthtext[m], monthtext[m])
     monthfield.options[today.getMonth()]=new Option(monthtext[today.getMonth()], monthtext[today.getMonth()], true, true) //select today's month
     var thisyear=1920;  // fixed start year of 1900
     var nowyear = 1994;
     var diff = nowyear - thisyear +1; // number of years from 1900
     for (var y=0; y<diff; y++){
         yearfield.options[y]=new Option(thisyear, thisyear)
         thisyear+=1
     }
}
</script>

<script>
function getcombined(){
    var year = document.getElementbyId("yeardropdown").value;
    var month = document.getElementById("monthdropdown").value;
    var day = document.getElementById("daydropdown").value;
    var combineddob = year + "-" + "month" + "-" + day;
    document.getElementById("hidden1").value=combineddob
}
</script>


</head>

<body>
<form action="" name="someform">
<select id="daydropdown" name='day' value="daydropdown">
</select> 
<select id="monthdropdown" name='month' value="monthdropdown">
</select> 
<select id="yeardropdown" name='year'  value="yeardropdown">
</select> 
<input type='hidden' id='hidden1' name='dob' value="" />
<input type='submit' />
</form>

<script type="text/javascript">

window.onload=function(){
    populatedropdown("daydropdown", "monthdropdown", "yeardropdown")
}
</script>


</body>
</html>

I need the <input type='hidden' id='hidden1' name='dob' value='' /> to update to var combineddob when the form is submitted.

I have tried several methods, but I do not know much about javascript so I am not good with these kinds of fixes.

I may be over looking something, but I have not yet figured out what is wrong here.

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1 Answer

  1. Editorial Team

    change your html

    <input type='submit' />

    to this

    <input type='submit' id="submitButton" />

    and in your script

    window.onload = function(){
    populatedropdown("daydropdown", "monthdropdown", "yeardropdown");
    var submitBtn = document.getElementById("submitButton");
    submitBtn.onsubmit = function(){getcombined();};
};

    This will allow you to run the function in onsubmit when the submit button is clicked. It will in turn call the function getcombined(); and then submit the form.

    EDIT

    Perhaps you should change these two lines:

    var combineddob = year + "-" + "month" + "-" + day;
document.getElementById("hidden1").value=combineddob

    to

    var combineddob = year + "-" + month + "-" + day;
document.getElementById("hidden1").value=combineddob;

    and 

    var year = document.getElementbyId("yeardropdown").value;

    to (note that getElementbyId is not a function)

    var year = document.getElementById("yeardropdown").value;
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