Javascript validation using C#.Net

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hi
I am trying to learn .net with javascript. So i have code a form with validation. but thing is that i want to call that javascript function on lostfocus event of textbox not on button's click event.is any solution for it.

Thank you.

Posted 14-Nov-11 21:29pm

Param From Mumbai

Updated 14-Nov-11 23:02pm

koolprasad2003

v2

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member60 · Answer 1 · 2011-11-14T21:33:00

Solution 1

If you want to do some client side processing, use onblur event and attach a JavaScript handler to it.
For server side processing, you need to handle TextBox's TextChanged event. Do remember to enable AutoPostBack for the TextBox.

Posted 14-Nov-11 21:33pm

member60

Updated 14-Nov-11 21:37pm

v2

Comments

RaviRanjanKr 15-Nov-11 3:38am

[Edited]Block quote is removed from normal texts[/Edited]

khan mohd faizan · Answer 2 · 2011-11-14T22:54:00

Solution 2

call ur javascript function on 'onblur' event

Posted 14-Nov-11 22:54pm

khan mohd faizan

Comments

Param From Mumbai 15-Nov-11 6:49am

how i will call it on onblur event

koolprasad2003 · Answer 3 · 2011-11-14T23:06:00

Solution 3

Firstly there is no lostfocus event for textbox the same event is called as "onblur". javascript is case sensative so call event properly.
Message on lostfocus

JavaScript

function callMe()
{
if (doument.getElementById("txtValue").value == "")
  {
    alert("Please enter text in textbox");
    return false;
  }
}

call it on lostfocus

JavaScript

<asp:textbox id="cmdCheck" runat="server" onblur="return callMe()" xmlns:asp="#unknown" />

Posted 14-Nov-11 23:06pm

koolprasad2003

Comments

Param From Mumbai 15-Nov-11 5:37am

My javascript function is this ::::

<script language="javascript" type="text/javascript">
function isvalidFirstname() {

var uid;
var temp = document.getElementById("<%=txtname.ClientID %>");
uid = temp.value;
var re = /^[a-zA-Z ]+$/
if (uid == "") {
return ("Please enter firstname" + "\n");
}
else if (re.test(uid)) {
return "";

}
else {
return ("FirstName accepts Characters and spaces only" + "\n");
}
}
</script>

and i am calling it as follow::

<asp:TextBox ID="txtname" runat="server" onblur="return isvalidFirstname()">

but still it not working is there any mistake i have done .....???

Param From Mumbai · Answer 4 · 2011-11-14T23:28:00

Solution 4

Thank you for your solution .i tried so much but i am not able use it into asp.net inline code.is there any solution for it...????/

Posted 14-Nov-11 23:28pm

Param From Mumbai

Comments

RaviRanjanKr 15-Nov-11 8:28am

you should use 'Have a Question or Comment' mentioned at the bottom to get quick response.