javascript validation in textbox

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I have one form in which i have one dropdown and one textbox. This textbox is depends on dropdown selection. when dropdown value is 'Other' then the textbox is enabled otherwise it is disabled. I want to apply javascript validation to the textbox, when textbox is enabled then it should not be emply while submiting the form.

JavaScript

function sugvalidate() {
     var related = document.getElementById('<%=DropDownList1.ClientID %>').value;
     var cat = document.getElementById('<%=txt_category.ClientID %>').value;
            if (related == "Other") {
                if (cat == "") {
                    alert("Please specify Category");
                    return false;
                }
            }
         }

ASP.NET

<asp:DropDownList ID="DropDownList1" runat="server" CssClass="ddcss" AutoPostBack="True" onselectedindexchanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Text="Error/Bug/Issue/Problem" Value="9"></asp:ListItem>
<asp:ListItem Text="Other" Value="10"></asp:ListItem>
</asp:DropDownList>

<asp:TextBox ID="txt_category" runat="server" Enabled="False" ReadOnly="True"></asp:TextBox>

<asp:Button ID="btn_submit" runat="server" Text="Submit" OnClientClick="return sugvalidate();" onclick="btn_submit_Click"   />

C#

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (DropDownList1.SelectedItem.Text == "Other")
        {
            txt_category.ReadOnly = false;
            txt_category.Enabled = true;
        }
        else
        {
            txt_category.ReadOnly = true;
            txt_category.Enabled = false;
        }
    }

Posted 20-Jul-14 10:40am

Raj Negi

Updated 20-Jul-14 10:41am

v2

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2 solutions

Solution 1

Hi Raj, I have done some modifications to your javascript code

C#

function sugvalidate() {
            var related = document.getElementById("<%= DropDownList1.ClientID %>");
            var selectedText = related.options[related.selectedIndex].text;

            var cat = document.getElementById("<%= txt_category.ClientID %>").value;

            if (selectedText == "Other") {
                if (cat === "") {
                    alert("Please specify Category");
                    return false;
                }
            }
        }

Hope this will solve your problem. :-)

Posted 20-Jul-14 18:03pm

Dilan Shaminda

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jacobjohn196 · Accepted Answer · 2014-07-20T20:20:00

C#

function sugvalidate() {
     var related = document.getElementById('<%=DropDownList1.ClientID %>').value;
     var cat = document.getElementById('<%=txt_category.ClientID %>').value;
            if (related == "10") {
                if (cat == "") {
                    alert("Please specify Category");
                    return false;
                }
            }
         }