how to use custom validator depends on dropdown value

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Hi all,

i have come confusion, how can we achieve this goal

for example, i have a dropdown, which the item is HR, Admin, IT

eg : <asp:DropDownList ID="DropDownList22" runat="server" OnSelectedIndexChanged="DropDownList22_SelectedIndexChanged" AutoPostBack="true" >
    <asp:ListItem>IT</asp:ListItem>
    <asp:ListItem>Admin</asp:ListItem>
    <asp:ListItem>HR</asp:ListItem>
</asp:DropDownList>

so, i want to put my validation here in date textbox, only if user select IT, this textbox will validate, for other (Admin and HR) they can left the date empty

<asp:TextBox ID="TextBox32" runat="server" AutoPostBack="true" OnTextChanged="TextBox32_TextChanged"></asp:TextBox>

what kind of validator can i use and how are the validator can be made?
i already try put requiredvalidator, but if i select admin and left the field empty, i got the errormessage too.

<asp:RequiredFieldValidator ID="chkDateReturn" runat="server" ControlToValidate="TextBox32" ErrorMessage="Must select the return date" ></asp:RequiredFieldValidator>

thanks

Posted 20-Mar-13 17:28pm

arif_dzainal

Updated 4-Jun-18 1:37am

v2

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4 solutions

Solution 1

Hello,

In your server side page load handler check the value of dropdown and if it anything other than IT then set CausesValidation property of the TextBox32 to false. You can also set Enabled property of chkDateReturn to false.

regards,

Posted 20-Mar-13 18:10pm

Prasad Khandekar

Solution 2

but doesn't that caused other validation to also disabled?

i'll give it a try first

Posted 20-Mar-13 19:56pm

arif_dzainal

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vinodkumarnie · Accepted Answer · 2013-03-21T17:15:00

Try below..

C# code below..

C#

protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            if (DropDownList22.SelectedItem.Text == "IT")
            {
                Button1.CausesValidation = true;
            }
            else
            {
                Button1.CausesValidation = false;
            }
        }
    }

    protected void DropDownList22_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (DropDownList22.SelectedItem.Text == "IT")
        {
            Button1.CausesValidation = true;
        }
        else
        {
            Button1.CausesValidation = false;
        }
    }

HTML code below..

HTML

<asp:DropDownList ID="DropDownList22" runat="server" OnSelectedIndexChanged="DropDownList22_SelectedIndexChanged"
            AutoPostBack="true">
            <asp:ListItem>IT</asp:ListItem>
            <asp:ListItem>Admin</asp:ListItem>
            <asp:ListItem>HR</asp:ListItem>
        </asp:DropDownList>
        <asp:TextBox ID="TextBox32" runat="server" AutoPostBack="true" OnTextChanged="TextBox32_TextChanged"></asp:TextBox>
        <asp:RequiredFieldValidator ID="chkDateReturn" runat="server" ControlToValidate="TextBox32"
            ErrorMessage="Must select the return date"></asp:RequiredFieldValidator>
        <asp:Button ID="Button1" runat="server" Text="Button" CausesValidation="false" />

Hope it helps you..

arif_dzainal · Accepted Answer · 2013-03-21T15:45:00

i already found the solution, it works for me though

XML

<%
                    if (DropDownList22.SelectedValue == "IT") {
                %>
                <asp:RequiredFieldValidator ID="chkDept" runat="server" ControlToValidate="TextBox32" ErrorMessage="Must select" ></asp:RequiredFieldValidator>
                <% } %>

thanks all

how to use custom validator depends on dropdown value

4 solutions

Solution 4

Solution 1

Solution 2

Solution 3

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