How To Validate TextBox after Pressing TAB Key

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hi
i want to make validation whether user has entered something or not in textbox as sooon as he presses TAB key
if the textbox is blank and presses TAB key then i want validation in javascript that can not empty and event as onlostFocus in ASP.net
plz help

Posted 7-Feb-14 20:54pm

Sachin MCA2012

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kedar001 · Answer 1 · 2014-02-07T21:07:00

Solution 1

try

XML

<script type="text/javascript">
    function validate(c)
        {
            if(c.value=="")
            {
                alert("The required field cannot left blank");
                c.focus();
            }
        }
</script>

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

Posted 7-Feb-14 21:07pm

kedar001

Comments

Sachin MCA2012 8-Feb-14 3:46am

but if the user click on other area still this message display how i can prevent this

Karthik_Mahalingam · Answer 2 · 2014-02-07T22:08:00

try this for tab key..

XML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <script src="jquery-1.10.2.js" type="text/javascript"></script>
    <script type="text/javascript">


        function validate(e, txt) {
            var KeyID = e.keyCode;
            if (KeyID == 9) {
                if (txt.value == '')
                    alert('Please enter the field..');
                txt.focus();
                return false;
            }
        }

    </script>
</head>
<body>
    <form id="frm" runat="server">
    <asp:TextBox ID="txtbox" onkeydown="return validate(event,this);" runat="server"></asp:TextBox>
    <asp:TextBox ID="TextBox1"   runat="server"></asp:TextBox>
    </form>
</body>
</html>