Introduction
Here we have to discuss how to validate a Dropdownlist using javascript.we can also validate a dropdownlist using RequireFieldValidator.
Language
Java script
Implementation
Validator using Client Side :- JavaScript {codecitation class="brush: javascript; gutter: true;" width="500px"} function CountryCheck(source, args)
{
var ddlCountry = document.getElementById(””);
var country =ddlCountry.options[ddlCountry.selectedIndex].value;
if (country == “0″)
{
args.IsValid = false;
}
else
{
args.IsValid = true;
}
}
{/codecitation}
Html Code
{codecitation class="brush: html; gutter: true;" width="500px"} <td>
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem Text="Select Country" Selected="True"></asp:ListItem>
<asp:ListItem Text="Japan"></asp:ListItem>
<asp:ListItem Text="USA"></asp:ListItem>
<asp:ListItem Text="Egypt"></asp:ListItem>
<asp:ListItem Text="UK"></asp:ListItem>
</asp:DropDownList>
<asp:CustomValidator ID="CustomValidator1" ControlToValidate="DropDownList1" runat="server" ErrorMessage="Please Select Country" ClientValidationFunction=”CountryCheck”></asp:CustomValidator>
</td>
{/codecitation}
Conclusion For this we use CustomValidator so write a function to validate a Dropdownlist and pass the function to Clientvalidationfunction property of Customvalidator. Thank you Venkat
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