Loop through a RadioButtonList using javascript, in order to validate if a selection has been made.

Posted on 2007-11-20
Last Modified: 2008-02-01

I have a radiobuttonlist which I have to validate using javascript. I know there are a million better ways and easier ways to do this using server side code, however specific to the application I am working on I need to do this in javascript.

Having searched and found many "Solutions" to this problem, I have had none that have worked.
I realy would appreciate some feedback on the easiest way to do this.
All I need to do us check if an item has been selected or not.


Question by:jazz__man
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LVL 17

Accepted Solution

gops1 earned 250 total points
ID: 20318780
Is this you are looking for?
		<title>Script Demo Gops</title>
		<script type="text/javascript">
			function checkRadio(f){
				var r=f.radbtn;
				var f=false;
				for(var i=0;i<r.length;i++){
				if(!f) alert("Nothing is checked"); else alert("Checked!!!");
	<form name="rad">
		<input type="radio" name="radbtn"><br>
		<input type="radio" name="radbtn"><br>
		<input type="radio" name="radbtn"><br>
		<input type="radio" name="radbtn"><br>
		<input type="radio" name="radbtn"><br>
		<input type="radio" name="radbtn"><br>
		<input type="radio" name="radbtn"><br>
		<input type="radio" name="radbtn"><br>
		<input type="radio" name="radbtn"><br>
		<input type="radio" name="radbtn"><br>
		<input type="button" value="Check" onclick="checkRadio(this.form)">

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LVL 12

Assisted Solution

needo_jee earned 250 total points
ID: 20318839
here is working code for what you have asked...

in ASPX form
In head section
<script type ="text/javascript"  language =javascript >
    function LoopThroughRDList()
    var MyRDList =document.form1.getElementsByTagName('input');
    var i=0;
        for(i=0; i < MyRDList.length - 1; i++)
            if(MyRDList[i].id.indexOf("MyRadioButtonList") != -1)
                alert("not checked");


 <asp:RadioButtonList ID="MyRadioButtonList" runat="server">
        <asp:Button ID="Button1" OnClientClick="LoopThroughRDList()"  runat="server" Text="Button" />


Author Comment

ID: 20318858
But for a RadioButtonList the Length is always 1 or at least when debugging thats what it always shows. I have 10 Items that are being pulled from the database and are being bound to each button.

So the first thing I have to do is count number of buttons on the RadioButtonList.
LVL 12

Expert Comment

ID: 20319217
if you are talking about counting in Javascript then the "RadioButtonList" dont hold any collection of its items .. you need to get all input type controls and then checking one by one if it is input then is checkbox, if yes then does it contains id of the RadioButtonList if yes then it is an item of the RadioButtonList
if you are talking about length in code serverside then you need to check
MyRadioButtonList.Items.Count  must give you the total intems in the list?

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