How to validate dropdown list

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i have dropdown list and also sub drop down list if i select fruit select in main dropdown list sub option will display that is multi select validate any one selected in save option.
tell me any idea thanks regards

What I have tried:

<asp:DropDownList ID="DropDownList4" class="form-control" runat="server">
<asp:ListItem Value="1">--SELECT--
<asp:ListItem Value="2">fruit
<asp:ListItem Value="3">veg

<asp:ListBox ID="Select49" SelectionMode="Multiple" runat="server">
<asp:ListItem Value="1"> 4
<asp:ListItem Value="2">8
<asp:ListItem Value="3">12
<asp:ListItem Value="4">16

Posted 5-May-16 3:17am

Nethaji chennai

Updated 5-May-16 3:49am

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Comments

ZurdoDev 5-May-16 9:23am

I don't understand you but I think what you want is called "cascading dropdowns."

Nethaji chennai 5-May-16 9:29am

if i select main dropdown list item sub option will display that will validate on save function

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Karthik_Mahalingam · Answer 1 · 2016-05-05T03:49:00

For validation

ASP.NET

<asp:button id="btnSave" text="Save" onclientclick="return ValidateFun();" runat="server" onclick="btnSave_Click" xmlns:asp="#unknown" />

Javascript:

<script>
    var ValidateFun = function ()
    {
        var listbox = document.getElementById('<%= Select49.ClientID%>');
        var count = listbox.selectedOptions.length;
        if (count == 0)
        { alert('Please select !!'); return false; }
        return true;
    }
</script>