drop down list validation for asp.net

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in vb.net web project, user forget to select a value in dropdownlist, so i need to give alert message if they forget to select, how to do? i don't know help me please

Posted 18-Oct-11 19:12pm

pugazhbala

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pugazhbala 19-Oct-11 3:31am

i generate dynamically so i don't know how to give

2 solutions

Solution 2

XML

<asp:DropDownList ID="dropDown1" runat="server" AutoPostBack="false">
    <asp:ListItem Text="None" selected="True"/>
    <asp:ListItem Text="text1" />
    <asp:ListItem Text="text2" />
    <asp:ListItem Text="text3" />
</asp:DropDownList>

<asp:requiredfieldvalidator id="RequiredFieldValidator1" runat="server" text="*" controltovalidate="dropDown1" errormessage="Please Select Category" initialvalue="None" xmlns:asp="#unknown"></asp:requiredfieldvalidator>


<asp:Button ID="Button1" runat="server" Text="Submit"  />

Posted 18-Oct-11 19:52pm

kishorekke

Comments

raj ch 19-Oct-11 2:08am

my vote of 5

pugazhbala 19-Oct-11 3:34am

required field validator is not working i tried already any dynamic form validation

NeenaM 2-Apr-13 15:34pm

Why in the above code you have used xmlns:asp="#unknown"
can you explain

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kiran dangar · Accepted Answer · 2011-10-18T19:28:00

Hi, you can implement a simple JavaScript validation function and call it on Button's OnClientClick method.
Below is the code.

aspx code

XML

<asp:DropDownList ID="dropDown1" runat="server" AutoPostBack="false">
    <asp:ListItem Text="None" />
    <asp:ListItem Text="text1" />
    <asp:ListItem Text="text2" />
    <asp:ListItem Text="text3" />
</asp:DropDownList>

<asp:Button ID="Button1" runat="server" Text="Submit" OnClientClick="javascript:return ValidateDropDown();" />

JavaScript Code

JavaScript

function ValidateDropDown() {
    var cmbID = "<%=dropDown1.ClientID %>";
    if (document.getElementById(cmbID).selectedIndex == 0) {
        alert("Please select a Value");
        return false;
    }
    return true;
}

Hope this will solve your problem..