When the TAB key is pressed with an empty text field, ASP.NET should display a validation message indicating that the field is required

Typically, required field validation occurs on button clicks. However, I would like the alert to be displayed when moving to the next TAB index instead. How can I achieve this using JavaScript and ASP.NET?

Answer №1

Give this a shot:

Suggestion:

<script type="text/javascript">
    function checkInput(input)
        {
            if(input.value=="")
            {
                alert("Please fill in the required field");
                input.focus();
            }
        }
</script>

Implementation:

<asp:TextBox ID="TextBox1" runat="server" onblur="checkInput(this)"></asp:TextBox>

Answer №2

One way to approach this is by using javascript, as shown in the following example from this discussion thread

Within the Page_Load function,

TextBox1.Attributes.Add("onblur", "ValidatorOnChange(event);") 

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