I have question about the textbox Validation

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I have Textbox-A and Textbox-B. Textbox-A is mandatory.

If a user comes to Textbox-A and without entering anything if he moves to next available control (Textbox-B) either by tabbing or by moving the cursor,

error message should be displayed.

Could anyone of you please help me by telling in which event to write the validation.

Looking forward to hear from you ASAP.

Posted 25-Feb-13 18:26pm

Hasitha Wijesooriya

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Sanjeev Alamuri · Answer 1 · 2013-02-25T18:37:00

Try this!!

XML

<!DOCTYPE html>
<html>
<head>
<script>
function myFunction(obj)
{

if(obj.value=="")
{
alert("Please enter Value");
}
else{
obj.value=obj.value.toUpperCase();
}
}
</script>
</head>
<body>

Enter your name 1: <input type="text" id="fname1" onblur="myFunction(this)"></br>
Enter your name 2: <input type="text" id="fname2" onblur="myFunction(this)"></br>
Enter your name 3: <input type="text" id="fname3" onblur="myFunction(this)"></br>
<p>When you leave the input field, a function is triggered which transforms the input text to upper case.</p>

</body>
</html>

Avik Ghosh22 · Answer 2 · 2013-02-25T18:37:00

XML

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                <asp:TextBox ID="TextBox2" runat="server" AutoPostBack="True"
                    ontextchanged="TextBox2_TextChanged"></asp:TextBox>

C#

protected void TextBox2_TextChanged(object sender, EventArgs e)
   {
       if (TextBox1.Text == "")
       {
           Response.Write("enter value in textbox1!");
           TextBox2.Text = "";
       }
       else
       {
       }
   }

sandeep207 · Answer 3 · 2013-02-25T18:42:00

Hi If you are using asp.net web application then you should use

OnBlur event when user lose control focus we need to write javascript validation to check whether textbox1 is emepty or not.
If you need code let me know

If you are using Window application then in Textbox control we have event of LostFocus

I have question about the textbox Validation

3 solutions

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