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Javascript validations to validate form in asp.net

Oct 22, 2010
Introduction 

Here I will explain how to validate form using JavaScript validations in asp.net 

Description

I have a one sample registration form that contains fields like Username, Password, Confirm Password, First Name, Last Name, Email, PhoneNo and Location.
Now I want to check whether user enter data in all fields or not and I want to check whether user enter correct data in all fields or not by using JavaScript.

If I want to check whether user enters data in textbox or not write script like this 


function isvaliduser()
{
var uid;
var temp=document.getElementById("<%=txtuser.ClientID %>");
uid=temp.value;
if(uid=="")
{
alert ("Please Enter UserName”);
return false;
}
else
{
return true;
}
}
Write the following code aspx page


<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Vallidations Page</title>
<script language="javascript" type="text/javascript">
function validate() {
var summary = "";
summary += isvaliduser();
summary += isvalidFirstname();
summary += isvalidLocation();
if (summary != "") {
alert(summary);
return false;
}
else {
return true;
}

}
function isvaliduser() {
var uid;
var temp = document.getElementById("<%=txtuser.ClientID %>");
uid = temp.value;
if (uid == "") {
return ("Please Enter UserName" + "\n");
}
else {
return "";
}
}
function isvalidFirstname() {
var uid;
var temp = document.getElementById("<%=txtfname.ClientID %>");
uid = temp.value;
if (uid == "") {
return ("Please enter firstname" + "\n");
}
else {
return "";
}
}
function isvalidLocation() {
var uid;
var temp = document.getElementById("<%=txtlocation.ClientID %>");
uid = temp.value;
if (uid == "") {
return ("Please enter Location" + "\n");
}
else {
return "";
}
}
</script>
</head>
<body>
<form id="form1" runat="server"> 
<table align="center">
<tr>
<td>
<asp:Label ID="lbluser" runat="server" Text="Username"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtuser" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="lblfname" runat="server" Text="FirstName"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtfname" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="lbllocation" runat="server" Text="Location"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtlocation" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:Button ID="btnsubmit" runat="server" Text="Save"
OnClientClick ="javascript:validate()" />
</td>
</tr>
</table>
</form>
</body>
</html>
Demo



If you want validation for emial and website url Here is the link

http://aspdotnet-suresh.blogspot.com/2010/09/validation-for-email-and-url-using-in.html

Happy Coding

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9 comments :

Anonymous said...

In the button event, I'm redirecting the page to another link. The page is redirecting even with the empty textboxes? The return false in the java script is not working?

Anonymous said...

thanks....this really helps me.

shashi kiran said...

hi suresh

I am using ajax watermark extender in this case its not working what to do please help me.

Mradu said...

great post as always

Jay Patel said...

hi sir,
I can visit your website.I thing one question in my mind.Your website visiter like website and display 10425 people like. please send the coding in this. My email ID:jailupatel007@gmail.com



Pugal Kannan said...

How to use the both JavaScript validation and asp.net validation for a control !

Anonymous said...

In txtuser.ClientID in that what is ClientID I can't understand sir..

Solwin said...

Thanks, its really helpful :D

mysql services said...

Great post

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