Question

JavaScript Validation

Asked by: APD_Toronto

Hello Experts,

I have a standard HTML form, with 5 mandatory fields.

How is it possible, when the user clicks Submit, the submit button to first call a function to check if these 5 fields are blank. And if so, cancel submit and display message?

Below, is a psedo code of what I need:

If txtName = "" Then
   Cancel Submit
   MsgBex ("Name field is mandatory")
end If
 
If txtCompany = "" Then
   Cancel Submit
   MsgBex ("Company field is mandatory")
end If
 
Proceed with Submit

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Asked On: 2009-11-03 at 10:01:58ID24868076
Tags: JavaScript Validation
Topics: Active Server Pages (ASP)
,; Hypertext Markup Language (HTML)
,; JavaScript
Participating Experts: 3
Points: 500
Comments: 17

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Answers

by: frankkyPosted on 2009-11-03 at 10:17:00ID: 25731775

Here's a link that might help:

http://www.webcheatsheet.com/javascript/form_validation.php

by: rpkharePosted on 2009-11-03 at 10:58:31ID: 25732213

The CheckValues function returns either "true" or "false". If it returns "false", execution is terminated.

<form action="a.php" method="post" onsubmit="return CheckValues();> 
</form>

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by: kadabaPosted on 2009-11-03 at 11:03:54ID: 25732279

a small example..

of course frankky's example contains exhaustive coverage.

<html>
<head>
<title>Small Form Validation Example</title>
<script type="text/javascript">
	function validateForm(theForm) 
	{
		document.getElementById('errorDiv').style.display="none";
		var initMessage = "<u><b>Mandatory Fields:</b></u>";
		var errorMessage = "";
		// Name validation
		markUnMarkError(theForm.name,'');
		if(theForm.name.value == '')
		{
			errorMessage = errorMessage + "<li>" + "Name" + "</li>";
			markUnMarkError(theForm.name,'errorHighLighter');			
		}
		// company validation
		markUnMarkError(theForm.company,'');
		if(theForm.company.value == '')
		{
			errorMessage = errorMessage + "<li>" + "Company" + "</li>";
			markUnMarkError(theForm.company,'errorHighLighter');		
		}
		
		if(errorMessage != "")
		{
			document.getElementById('errorDiv').innerHTML = initMessage + errorMessage;
			document.getElementById('errorDiv').style.display="block";
			return false;
		}
		return true;
	}
	function markUnMarkError(objekt,css)
	{
		objekt.className = css;
	}
</script>
<style type="text/css">
.samp{
float:left;
width:100px;
}; 
.error{
width:250px;
}
.errorHighLighter
{
background-color :#FFFF99; 
}
</style>
</head>
<body>
<div id="errorDiv" class="error" style="display:none;">
</div>
<br>
<form name="myForm" onsubmit="return validateForm(this)" action="http://www.google.com">
 <div id="nameWrapper">
	 <div class="samp" id="label_name">Name<font color="red">*</font>:</div>
	 <div><input name="name" id="name" type="text"></div>
 </div>
 <div id="comapnyWrapper">
	 <div class="samp" id="label_company">Company<font color="red">*</font>:</div>
	<div ><input name="company" id="company" type="text"></div>
 </div>
	<div><input name="Submit" value="Send" type="submit" ></div>
</form>
</body>
</html>

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by: APD_TorontoPosted on 2009-11-04 at 10:51:13ID: 25742521

I have the following code, but for some reason, doesn't work

		<script language="javascript">
			<!--
			
				function validate()
				{
					if(frm.txtCompany = '') 
					{
						alert('Company field cannot be blank');
						return false;
					}
				}
			-->
		</script>
 
 
<form name="frm" method="POST" action="thank-you.asp" onSubmit="return validate();">

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by: kadabaPosted on 2009-11-04 at 10:54:06ID: 25742561

if(frm.txtCompany = '')

should be

if(frm.txtCompany.value == '')

by: kadabaPosted on 2009-11-04 at 10:54:29ID: 25742566

also txtCompany is the name of the text box.

by: kadabaPosted on 2009-11-04 at 10:56:12ID: 25742579

sorry
ok missed few points

frm will be undefined how will the script know what is frm?

try this script

by: kadabaPosted on 2009-11-04 at 10:57:10ID: 25742590

oops sorry getting distracted...

                <script language="javascript">
                        <!--
                        
                                function validate(frm)
                                {
                                        if(frm.txtCompany.value == '') 
                                        {
                                                alert('Company field cannot be blank');
                                                return false;
                                        }
return true
                                }
                        -->
                </script>
 
 
<form name="frm" method="POST" action="thank-you.asp" onSubmit="return validate(this);">

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by: APD_TorontoPosted on 2009-11-04 at 11:01:14ID: 25742637

frm is the name of my form <form name="frm" ...>

txtCompany is <input type="text" name="txtCompany" ...>

its still not working

by: kadabaPosted on 2009-11-04 at 11:08:18ID: 25742710

are you getting any error?
is this how your form looks? then it should work

<html>
<head>
<script type="text/javascript">
	function validate(frm)
	{
		if(frm.txtCompany.value == '') 
		{
				alert('Company field cannot be blank');
				return false;
		}
		return true;
	}
</script>
</head>
<body> 
	<form name="frm" method="POST" action="thank-you.asp" onSubmit="return validate(this);">
		Company: <input type="text" name="txtCompany">
		<input type="submit" name="submit" value="submit">
	</form>
</body>
</html>

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by: APD_TorontoPosted on 2009-11-04 at 12:35:09ID: 25743612

When I ran your code independently, it works.

When I insert it in my code, it just goes to thank-you.asp

I get no errors.

by: kadabaPosted on 2009-11-04 at 12:48:38ID: 25743741

well,
try this way, remove onSubmit from the form tag
in your submit button
do the same but on
OnClientClick="return submit_onclick()" and see if it works.

by: APD_TorontoPosted on 2009-11-04 at 12:57:19ID: 25743834

Actually, I did something else...

For testing I added the code below

Now I get:

Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.3; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727)
Timestamp: Wed, 4 Nov 2009 20:52:15 UTC

Message: 'txtCompany.value' is null or not an object
Line: 28
Char: 3
Code: 0

<INPUT type="button" value="Button" onClick="return validate(this);">

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by: APD_TorontoPosted on 2009-11-04 at 12:59:44ID: 31649543

i fixed it by removing the (frm) parameter

by: kadabaPosted on 2009-11-04 at 13:04:08ID: 25743907

ahh my mistake should have pointed that out to you...

when in the form tag " this " would mean the form object
instead of validate(this)
use validate(document.frm)

use this so that it wont break , do test it in other browsers.

by: APD_TorontoPosted on 2009-11-04 at 13:47:00ID: 25744308

Sorry, closed too soon

For text fields, this works well:
if(frm.txtCompany.value == '')
{
alert('The Company field is mandatory');
return false;
}

However,. I tried the following for a dropdown, where *** Please Select *** is not a valid selection, but nothing happens:
if(frm.cboModule.value == '*** Please Select ***')
{
alert('The Module field is mandatory');
return false;
}

As well, I also need to validate if a radio button is selected within a group, I can't imagine the code for tha.

Please help

by: kadabaPosted on 2009-11-04 at 14:13:37ID: 25744589

not a problem,
have some comments in the code itself, its late for me
will answer questions if any tomorrow

<html>
<head>
<script type="text/javascript">
        function validate(frm)
        {
                if(frm.txtCompany.value == '') 
                {
                                alert('Company field cannot be blank');
                                return false;
                }
				/*
					Notice that the in the drop down, the options have a attribute called value.
					This will work only if the value attribute is present(across all browsers).
					i.e if the drop downs are like this
					<select name="cboModule" id="cboModule">
						<option  selected>*** Please Select ***</option>
						<option >module1</option>
						<option >module2</option>
						<option >module3</option>
					</select>
					then the function below will look like
					if(frm.cboModule.options[frm.cboModule.options.selectedIndex].text == '*** Please Select ***') 
					{
						alert('Company field cannot be blank');
						return false;
					}
				*/
				if(frm.cboModule.value == '*** Please Select ***') 
                {
					alert('Module field cannot be blank');
					return false;
                }
				// validate the radio buttons
				var rads  = document.getElementsByName('grp');
				var isRadChecked = false;
				for(var i=0;i<rads.length;i++)
				{
					if(rads[i].checked)
					{
						isRadChecked = true;
						break;
					}					
				}
				if(!isRadChecked)
				{
					alert('Please select an option');
					return false;
				}
                return true;
        }
</script>
</head>
<body> 
	<form name="frm" method="POST" action="thank-you.asp">
			Company: <input type="text" name="txtCompany">
			<input type="submit" name="submit" value="submit" onclick="return validate(document.frm);">
			<br>
			Module: <select name="cboModule" id="cboModule">
						<option value="*** Please Select ***" selected>*** Please Select ***</option>
						<option value="module1">module1</option>
						<option value="module2">module2</option>
						<option value="module3">module3</option>
					</select>
					<br>
			select option: <input type="radio"	id="rad1" name="grp">1
							<input type="radio"	id="rad2" name="grp">2
							<input type="radio"	id="rad3" name="grp">3
							<input type="radio"	id="rad4" name="grp">4			
	</form>
</body>
</html>

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JavaScript Validation

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