validating textbox in asp.net

Question

0.00/5 (No votes)

See more:

am developping an sample asp.net application i need to validate a textbox i used javascript to check whether the text box is empty or not.but its byepassing the validation if i enter a space only.how can i overcome it..........

Posted 30-Jun-11 18:41pm

varunmohan

Add a Solution

Comments

walterhevedeich 1-Jul-11 0:46am

Show us your validation code and probably the HTML tag for the textbox so we can somehow pinpoint where the culprit is.

4 solutions

Solution 1

If you want to count empty spaces also, check the length of the textbox's text. You can try below javascript code:

document.getElementById("txt").value.length

You can also try JQuery:

$("#txt").val().length

If you don't want to consider spaces then you need to trim the text before checking for length. To trim text in javascript you can use solution#2 and for JQuery you can do it like this:

$.trim($("#txt").val()).length

Here "txt" is the client-id of the textbox control.

Hope that helps!

Posted 30-Jun-11 18:54pm

RakeshMeena

Updated 30-Jun-11 19:04pm

v2

Solution 3

C#

if(document.forms(0).textbox1.value == '')
            {
                alert('Please enter the text.');
                document.forms(0).textbox1.focus();
                return false;
            }

Posted 1-Jul-11 0:47am

Dwarika(RAJ)

Solution 4

use requiredfieldvalidator(validation control in asp.net) i hope its solve your problem

Posted 1-Jul-11 0:50am

guptaadeepak

v2

Comments

Rajneet Kaur 1-Jul-11 7:06am

Add requiredfieldvalidator Control from Textbox , then go propeties of requiredfieldvalidator , select ControlToValidate ,there select text id of that textbox, to which u want to add requiredfieldvalidator also Type ERRor MEssage .....requiredfieldvalidator Control is to check, that textbox should not be blank.......

guptaadeepak 1-Jul-11 7:49am

Rajneet you explain very well

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sunasara Imdadhusen · Accepted Answer · 2011-06-30T18:54:00

Hi,

asp.cs

C#

page_load(..)
{
  btnSubmit.Attributes.Add("onclick","return checkValidation();");
}

.aspx

C#

function checkValidation()
{
    var txt = trim(document.GetElementById('txtUser').value);
    if(txt.length == 0)
    {
       alert('Please fill in text box');
       return false;
    }  
    return true;
}
function trim(str)
{
    if(!str || typeof str != 'string')
        return null;
    return str.replace(/^[\s]+/,'').replace(/[\s]+$/,'').replace(/[\s]{2,}/,' ');
}