Answer / guneetinder singh

By using custom validator.

Answer / swethasri

Client Side validation:
A Javascript function can be written to disable/enable the
text box and it can be called under
DrowpDownList_SelectIndexChanged event. We can provide an
if condition and get the required change in javascript
function.

or else

Server side validation:
we can make the dropdownlist 'AutoPostBack' property true.
and under the DrowpDownList_SelectIndexChanged event, we
can disable/enable the textbox.

Answer / rajesh

by using javascript function can be written to
disable/enable the text box and it can be called under
DrowpDownList_SelectIndexChanged event.

Answer / devkranth kishore

U can do it By Adding a Required validator To the textbox
with enabled is false...

no in the Drop downList selected IndexChanged make it
enable True... this will solve the Isssue

Answer / deepak

just write a javascript function like this
on button click or on onkeypress event of text box

function validate()
{
if(document.getelementbyid("ur dropdownlist").value=="other")
{
if(document.getelementbyid("ur textbox").value=="")
{
alert("please enter city name");
return false;
}

}

}

and call like this onkeypress='return validate()'

Answer / sai krishna

In aspx page

<asp:DropDownList ID="DropDownList1" runat="server"
Width="176px">
<asp:ListItem>Pune</asp:ListItem>
<asp:ListItem>Chennai</asp:ListItem>
<asp:ListItem>Hyderabad</asp:ListItem>
<asp:ListItem>Other</asp:ListItem>
</asp:DropDownList>
<asp:TextBox ID="TextBox2"
runat="server"></asp:TextBox>

<script language="javascript" type="text/javascript">
var other1 = window.document.getElementById("TextBox2");
other1.disabled = true;
function ValidateOtherCity()
{
var other = window.document.getElementById
("DropDownList1");
var other2 = window.document.getElementById
("TextBox2");
if(other.value == 'Other')
{
other2.disabled = false;
}
else
{
other2.disabled = true;
}
}
</script>


In aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
DropDownList1.Attributes.Add
("OnChange", "javascript:ValidateOtherCity();");
}

Answer / udai

On_page load
{
RequiredFieldValidator1.Enabled = false;
}

if (DropDownList1.SelectedItem.Text == "Other")
{
RequiredFieldValidator1.Enabled = true;
}
else
{
RequiredFieldValidator1.Enabled = false;
}

Answer / swetha v

Hi Friends,

I hope the below solution helps....

1. Please add the required field validator for the texbox.
2. In Page_Load method, we can add the below statement

Dropdownlist.Attributed.Add
("OnChange","javascript:ValidateOtherCity();")

Add the below javascript function on the aspx page

function ValidateOtherCity()
{
var other = window.document.getElementById
("DropdownlistName");

if(other.value == 'Other')
{
ValidatorEnable(RequiredFieldValidatorName,true);
}
else
{
ValidatorEnable(RequiredFieldValidatorName,false);
}
}

Explain Generics?

1 Answers  

Any disadvantages in Dataset and in reflection ?

1 Answers   DELL,

What is the main difference between grid layout and flow layout?

1 Answers  

Why is this service branded with windows livetm?

0 Answers  

Input:http://www.allinterview.com/forms/questionform.php Output:http://www.allinterview.com/forms/questionform Write c# program to get the above desired output for the given Input.....

3 Answers   Bally Technologies,

Why is string called immutable data type?

0 Answers  

Difference between ADO.net Dataset , ADO Record Set & ADO Data Reader?

3 Answers   HCL, NIIT,

is it possible to set more than web.config file for an ASP.net APPLICATION?can it run?how is it possible

3 Answers  

What ASP.NET object encapsulates the state of the client and the browser? a) The Session object b) The Application object c) The Response object d) The Request object e) The Server object

7 Answers   Bunzl Vending, Syntax Softtech,

How to limit table cell size with long strings?

1 Answers   IBS,

What are the Types of state management techniques

0 Answers   Digital GlobalSoft,

What are resource file and how do we generate resource file?

0 Answers