Solved

Radio Button Validation

Posted on 2009-05-12
4
363 Views
Last Modified: 2012-05-06
Hello,
I'm trying to validate radio button as shown below.
I just need to get length of number of radio buttons in the form.
But I don't know how to reference it.
I can get the reference by specifying element name of radio button like formName.radioVal.length. However, I'd like to use this function to any form I create.
Please someone advise.
Thank you.

<script language="JavaScript" type="text/javascript">
<!--
 
function checkRadioSelected(formObj, lbl) {
 
	if (!formObj)
	    return false;
 
	var myRadio = -1;
			
	if (formObj.lbl.length == 0)
		return false;
		
	for (var x = formObj.lbl.length-1; i > -1; i--) {
		if (formObj.lbl[x].checked) {
			myRadio = i;
			i = -1;
		}
	}
	
	if (myRadio == -1) {
		alert('Nothing is selected');
		return false;
	} else {
		return true;
	}
}
 
 
<form name="myForm">
<input type="radio" name="radioval" value=1>
<input type="radio" name="radioval" value=2>
<input type="radio" name="radioval" value=3>
 
<!-- I need to use href to execute the function -->
<a href="javascript: void(0)" onclick="checkRadioSelected(myForm, 'radioVal');">
Check
</a>
 
</form>
 
 
-->
</script>

Open in new window

0
Comment
Question by:eb110k
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
4 Comments
 
LVL 3

Expert Comment

by:janjerell
ID: 24371478
Pass the radio object itself.

Try this:
<html>
<head>
<script language="JavaScript" type="text/javascript">
 
function checkRadioSelected(lbl) {
 
        if (!lbl)
            return false;
 
        var myRadio = -1;
 
 
        if (lbl.length == 0)
                return false;
                
	
        for (var i = lbl.length-1; i > -1; i--) {
 
                if (lbl[i].checked) {
                        myRadio = i;
                        i = -1;
                }
        }
 
 
        if (myRadio == -1) {
                alert('Nothing is selected');
                return false;
        } else {
                return true;
        }
} 
 
</script>
</head>
 
<body>
<form name="myForm">
<input type="radio" name="radioval" value=1>
<input type="radio" name="radioval" value=2>
<input type="radio" name="radioval" value=3>
 
<!-- I need to use href to execute the function -->
<a href="javascript: void(0)" onclick="checkRadioSelected(document.myForm);">
Check
</a>
 
</form>
</body>
 
</html>

Open in new window

0
 
LVL 3

Accepted Solution

by:
janjerell earned 500 total points
ID: 24371488
Sorry, it's this one:
<script language="JavaScript" type="text/javascript">
 
function checkRadioSelected(lbl) {
 
        if (!lbl)
            return false;
 
        var myRadio = -1;
 
 
        if (lbl.length == 0)
                return false;
                
	
        for (var i = lbl.length-1; i > -1; i--) {
 
                if (lbl[i].checked) {
                        myRadio = i;
                        i = -1;
                }
        }
 
 
        if (myRadio == -1) {
                alert('Nothing is selected');
                return false;
        } else {
                return true;
        }
} 
 
 
</script>
<body>
<form name="myForm">
<input type="radio" name="radioval" value=1>
<input type="radio" name="radioval" value=2>
<input type="radio" name="radioval" value=3>
 
<!-- I need to use href to execute the function -->
<a href="javascript: void(0)" onclick="checkRadioSelected(document.myForm.radioval);">
Check
</a>
 
</form>
</body>

Open in new window

0
 

Author Closing Comment

by:eb110k
ID: 31580839
Thank you for your advise.
It worked perfectly by passing object.
0
 
LVL 3

Expert Comment

by:janjerell
ID: 24372037
glad to help..
0

Featured Post

Salesforce Has Never Been Easier

Improve and reinforce salesforce training & adoption using WalkMe's digital adoption platform. Start saving on costly employee training by creating fast intuitive Walk-Thrus for Salesforce. Claim your Free Account Now

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article will give core knowledge of JavaScript and will head in to your first JavaScript program. I am Durvesh Naik and I am here to deal with this series of JavaScript. I will teach you JavaScript in part wise , as its quite boring to read big…
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

717 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question