recquiredField Validator through javascript

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Hi all, I am new with javascript please help me to solve this small problem..

how to make textbox required on buttonclick through javascript.

Posted 25-Aug-12 21:29pm

Raju2049

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enhzflep · Answer 1 · 2012-08-25T21:40:00

HTML

<!DOCTYPE html>
<html>
<head>
<script>
function validateNameInput()
{
	var value = document.getElementById('nameInput').value;
	if (value.length < 4)
		alert('String is too short. Must be 4 or more chars long\n\n(you used ' + value.length + ')');
	else
		alert('String valid\n\nLength: '+value.length);
}
</script>
</head>
<body>
	<label for='nameInput'>Enter a string - must be longer than 3 chars</label>
	<input id='nameInput' />
	<button onclick='validateNameInput();'>Validate</button>
</body>
</html>

__TR__ · Answer 2 · 2012-08-26T02:30:00

Here is a sample code of how to make a text box required field.

XML

<asp:TextBox ID="Textbox1" runat="server"></asp:TextBox>
    <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return ValidateTextBox()" />

XML

<script type="text/javascript">
   function ValidateTextBox()
   {
       var Text = document.getElementById('<%=Textbox1.ClientID %>');

       if(Text.value == "")
       {
           alert('No data entered in textbox');
           return false;
       }

   }
   </script>

Since you are new to JavaScript you might find the below links useful
JavaScript Tutorial[^]

Beginner JavaScript[^]

Jquery Tutorial[^]

**AmitGajjar** · Answer 3 · 2012-08-25T21:57:00

Solution 2

Hi,

When anything i need to work with javascript, i use jQuery(personally i like it:))

So for your solution i would like to suggest you to use jQuery.

Please have a look at below link,
RequiredFieldValidation using jQuery[^]

Hope you enjoy working with jQuery.

Thanks
-Amit Gajjar

Posted 25-Aug-12 21:57pm

AmitGajjar

mark_zh · Answer 4 · 2012-08-27T05:02:00

hi, try it like this:

JavaScript

<input name="crm_surname" id="crm_surname" type="text" size="20" maxlength="200" style="width: 200px;" /><label>*</label>
                    <label id="nameRequired" style="display: none;">
                        name is required</label>

<button onclick='checkNameRequired();'>button</button>

C#

function checkNameRequired() {
           var txtName = document.getElementById("crm_surname");
           var nameRequired = document.getElementById("nameRequired");
           if (txtName == "") {
               nameRequired.style.display = "";
                return false;
           }
           else {
               nameRequired.style.display = "none";
           }
           return true;
       }

Joan M · Answer 5 · 2012-08-27T06:01:00

Take a look at this links, all come with code samples and explanations:

http://sbpoley.home.xs4all.nl/webmatters/formval.html[^]

http://rickharrison.github.com/validate.js/[^]

http://www.w3schools.com/js/js_form_validation.asp[^]

Keep in mind that there are people out there with javascript disabled so, checking things with javascript is correct, but making that again using server side validation (PHP...) is a good idea. You should get problems in the sever side validation if you've passed the JS one.
With JS you get easiness and you don't need to post the form in order to check it, but consider that.

Good luck!

recquiredField Validator through javascript

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