How to get previous selected item and current selected item from dropdownlist using Javascript?

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Dear Sir,

I need, How to get previous selected item and
current selected item from
drop down list using Java script?

Note:
Both of the values i need. How to solve this problem in javascript?????

By MohaN

Posted 11-Apr-12 18:55pm

Mohankumar.Engain

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Ankur^\m/ · Answer 1 · 2012-04-11T19:52:00

To get the current selected item:

JavaScript

var dropdown = document.getElementById("DropDownListID");
var selValue = dropdown.options[dropdown.selectedIndex].value;

To get the previous value, it's easy to get them using jQuery:
get previous selected dropdown item[^]
Getting value of select (dropdown) before change[^].
I am not sure of a direct way to get the previous value using JavaScript. But if you have to do it using JavaScript, use couple of hidden fields and store previous and current value in them. When the dropdownlist value is changed, copy current hidden field value to prev. hidden field value and then replace current hidden field value with selected drop down value. In this way you will have both the values. I am using to hidden field because I am not sure if onbeforechange event works for drop down list. Check out if it does, it would be much easier.
The other way would be to try and break the jQuery method to JavaScript. :)

Angel1320 · Answer 2 · 2012-04-11T19:32:00

You can achieve this by following way

JavaScript

<script type="text/javascript">
    function GetPriviousValue()
    {
        var currentValue = $(".ddlList").val();
        var previousValue = $("#hdnPreviousValue").val();

        if (previousValue != "")
        {
            alert("CurrentValue : " + currentValue + " PreviousValue : " + previousValue);
        }
        else
        {
            alert("CurrentValue : " + currentValue + " And FirstTime Dropdown Value is selected.");
            $("#hdnPreviousValue").val(currentValue);
        }
    }
</script>

C#

<input type="hidden" id="hdnPreviousValue" />
<asp:dropdownlist id="ddlList" cssclass="ddlList" runat="server" xmlns:asp="#unknown">
<asp:listitem value="abc" text="abc"></asp:listitem>
<asp:listitem value="xyz" text="xyz"></asp:listitem>
<asp:listitem value="pqr" text="pqr"></asp:listitem>
<asp:listitem value="asd" text="asd"></asp:listitem>
<asp:listitem value="ytr" text="ytr"></asp:listitem>
<asp:listitem value="mnb" text="mnb"></asp:listitem>
<asp:listitem value="uio" text="uio"></asp:listitem>
</asp:dropdownlist>
<input type="button" id="btnOK" onclick="GetPriviousValue()" />

Try this one, It is definitely work for you.

How to get previous selected item and current selected item from dropdownlist using Javascript?

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