Question

Uncheck last item checked in a CheckBoxList

Asked by: quanmac

I am trying to uncheck the last item checked of a checkboxlist when there are more than a certain number of items checked.

On the CheckBoxList:
chkAns.Attributes.Add("onclick", "CheckForTotalClicks('" + chkAns.ClientID + "', 3);");

When I check off a 4th item, the alert box didn't pop up and the 4th checked item doesn't get unchecked.

Any suggestions?

<script language="JavaScript" type="text/javascript">
<!--
    function CheckForTotalClicks(sourceId, totalClicks) 
    {
        //Check for total number of clicks
        var count = 0;
        var els = document.getElementsByTagName('input');
        var checkedItems = new Array();
        for (var i = 0; i < els.length; ++i) {
            var e = els[i];
            if (e.type == 'checkbox' && e.checked && (e.name.indexOf(sourceId) >= 0)) 
            {
                ++count;
                checkedItems.push(e.name);
            }
        }
        if (count > totalClicks) {
            alert('Please select up to ' + totalClicks + ' topics');
            var unCheck = document.getElementsByName(checkedItems.pop());
            unCheck.item.checked = false;
        }   
    }
-->
</script>

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Asked On: 2009-09-01 at 10:09:16ID24698669
Tags: .NET
,; C#
,; CheckBoxList
,; Javascript
Topics: Programming for ASP.NET
,; C# Programming Language
,; .NET Framework 2.x
Participating Experts: 3
Points: 500
Comments: 14

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Answers

by: quanmacPosted on 2009-09-01 at 10:10:47ID: 25233658

I've also tried:

unCheck.checked = false;

in the javascript and it still didn't work.

by: NeilsrPosted on 2009-09-01 at 10:19:24ID: 25233736

From Article http://www.experts-exchange.com/Programming/Languages/.NET/ASP.NET/Q_21095389.html

============
Well, here's another try. This might work, but only IE supports this syntax. If it works, a similar solution can be made to support other browsers.

Two possible ways of going at it:

1. Give your single unique checkbox an id.
<asp:ListItem id="SpecialCheckbox"...>

Then in the <head> section of your aspx page, add the following client-side script block:
<script for="SpecialCheckbox" event="onclick">
window.cancelEvent = true; // avoid the postback
var chk = event.srcElement;
alert( chk.checked ); // just to see that it works
</script>

2. This is a better solution for generated list items (i.e., made at run-time in your code-behind or other scriptblock):
Give all your listitems the same id, and also give them an attribute that identifies them in addition.
So the result html could look like:
<input type="checkbox" name="MyCheckboxList" specialId="1">
<input type="checkbox" name="MyCheckboxList" specialId="2">
<input type="checkbox" name="MyCheckboxList" specialId="3">

And then in the same client-side script block:
<script for="SpecialCheckbox" event="onclick">
var chk = event.srcElement;
alert( chk.checked ); // just to see that it works
if( chk.specialId == '3' ) {
event.cancelEvent = true; // avoid the postback
// do stuff
}
</script>

If these don't work, you can try some variation. Maybe this will give you a better direction.

Btw, have you considered that a better solution may be to avoid using a CheckBoxList? You can use a DataRepeater to render all your checkboxes in a similar way, and this gives you more flexibility for particular treatment of special checkboxes.

by: HonorGodPosted on 2009-09-01 at 10:39:56ID: 25233913

Something like this perhaps?

<html>
<body>
 
1 <input type='checkbox'><br>
2 <input type='checkbox'><br>
3 <input type='checkbox'><br>
4 <input type='checkbox'><br>
<script type="text/javascript">
function last() {
  var inputs = document.getElementsByTagName( 'INPUT' );
  for ( var i = inputs.length - 1; i > 0; i-- ) {
    var input = inputs[ i ];
    if ( input.type == 'checkbox' ) {
      input.checked = false;
      break;
    }
  }
}
</script>
<input type='button' value='Last' onclick='last()'>
 
</body>
</html>

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by: ddayx10Posted on 2009-09-01 at 11:14:25ID: 25234277

I tend to want to stand this problem on it's head to make it easier to solve. I really dont want to try to debug your code. I would solve this problem by changing my assignment of the javascript onclick event to the items of the checkboxlist control instead of the control itself. This gives me a very easy way of tracking which input called the function and therefore which was the last to be previously checked.

Works great!

So (see example):

****ASPX SMPL Page w/JavaScript****
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Managing CheckBoxList</title>
    <script type="text/javascript">
		
		var previouslyCheckedInput;
		
		function manageCheckBoxes(parent, source, maxChecked)
		{
			var inputsChecked = 0;
			var inputCollection = parent.getElementsByTagName('input');
			
			for(i=0;i<inputCollection.length;i++)
			{
				if(inputCollection[i].checked)
				{ inputsChecked ++; }
			}
 
			if(inputsChecked > maxChecked)
			{
				previouslyCheckedInput.checked = false;
			}
			
			previouslyCheckedInput = source;
		}
    
    </script>
</head>
<body>
    <form id="form1" runat="server">
 
		<asp:CheckBoxList ID="chkBoxL" runat="server">
			<asp:ListItem Text="Option1" Value="1" />
			<asp:ListItem Text="Option2" Value="2" />
			<asp:ListItem Text="Option3" Value="3" />
			<asp:ListItem Text="Option4" Value="4" />
			<asp:ListItem Text="Option5" Value="5" />
		</asp:CheckBoxList>
 
    </form>
</body>
</html>
 
 
****CODE BEHIND****
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            foreach (ListItem l in chkBoxL.Items)
            { l.Attributes.Add("onclick", "manageCheckBoxes(" + chkBoxL.ClientID + ",this,3);"); }
        }
    }

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by: HonorGodPosted on 2009-09-01 at 11:37:25ID: 25234566

ah. Now I see what you are talking about...

Something like this perhaps?

<html>
<head>
<script type="text/javascript">
function LE( obj, limit ) {
  if ( obj.checked ) {
    var inputs = document.getElementsByTagName( 'INPUT' );
    for ( var i = 0; i < inputs.length; i++ ) {
      var input = inputs[ i ];
      if ( ( input.type == 'checkbox' ) && ( input.checked ) ) {
        if ( limit > 0 ) {
          limit--;
        } else {
          obj.checked = false;
          break;
        }
      }
    }
  }
}
</script>
</head>
<body>
 
1 <input type='checkbox' onchange='LE(this, 2)'><br>
2 <input type='checkbox' onchange='LE(this, 2)'><br>
3 <input type='checkbox' onchange='LE(this, 2)'><br>
4 <input type='checkbox' onchange='LE(this, 2)'><br>
 
</body>
</html>

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by: ddayx10Posted on 2009-09-01 at 11:48:23ID: 25234672

If I understood the problem correctly he wants a max number of inputs allowed checked. If a newly checked input exceeds the limit he wants to unselect the input that was checked previous to the current selection?!! Maybe I misunderstood the problem, but that's what the code sample I wrote above does...alas I dunno anymore and until user gets a chance to look at everything and comment I'm gonna chill.

I think maybe I overthought this, but it's even easier if he just wants the last one selected to be unchecked. Just change the above code provided by two lines.

    <script type="text/javascript">
		
	
		function manageCheckBoxes(parent, source, maxChecked)
		{
			var inputsChecked = 0;
			var inputCollection = parent.getElementsByTagName('input');
			
			for(i=0;i<inputCollection.length;i++)
			{
				if(inputCollection[i].checked)
				{ inputsChecked ++; }
			}
 
			if(inputsChecked > maxChecked)
			{
				source.checked = false;
                                    //fire some alert msg if you want
			}
 
		}
    
    </script>

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by: quanmacPosted on 2009-09-01 at 11:57:56ID: 25234761

ddayx10, yes you understood my problem.

I tried running your code and it gave me a javascript error:

Message: 'chkList104677' is undefined
Line: 305
Char: 1
Code: 0

seems to be having a problem with the source

by: ddayx10Posted on 2009-09-01 at 12:29:05ID: 25235049

Well I took advantage of an IE quirk in sending the ClientID to the JS function. It worked in IE but not so good in Firefox. I shoulda checked that. I don't get the same error as you, but I did get an error in FF. I modified the code behind and the JS slightly to correct this. Otherwise I've tested this in both browsers without any problems...hope it works for you :)

PS: When you say I understood the problem:
A) You want the previously selected input to uncheck, leaving the most recently selected input checked?
OR
B) Just stop the last check from happening if its over the limit?

Either way I think I showed you above how to manage both ways.

*****ASPX PAGE****
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Managing CheckBoxList</title>
    <script type="text/javascript">
		
		var previouslyCheckedInput;
		
		function manageCheckBoxes(parentID, source, maxChecked)
		{
			var inputsChecked = 0;
			var parent = document.getElementById(parentID);
			var inputCollection = parent.getElementsByTagName('input');
			
			for(i=0;i<inputCollection.length;i++)
			{
				if(inputCollection[i].checked)
				{ inputsChecked ++; }
			}
 
			if(inputsChecked > maxChecked)
			{
				previouslyCheckedInput.checked = false;
			}
			
			previouslyCheckedInput = source;
		}
    
    </script>
</head>
<body>
    <form id="form1" runat="server">
 
		<asp:CheckBoxList ID="chkBoxL" runat="server">
			<asp:ListItem Text="Option1" Value="1" />
			<asp:ListItem Text="Option2" Value="2" />
			<asp:ListItem Text="Option3" Value="3" />
			<asp:ListItem Text="Option4" Value="4" />
			<asp:ListItem Text="Option5" Value="5" />
		</asp:CheckBoxList>
 
    </form>
</body>
</html>
 
 
****CODE BEHIND****
public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            foreach (ListItem l in chkBoxL.Items)
            { l.Attributes.Add("onclick", "manageCheckBoxes('" + chkBoxL.ClientID + "',this,3);"); }
        }
    }
}

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by: HonorGodPosted on 2009-09-01 at 12:33:32ID: 25235096

The function LE() (i.e., Less Than, or Equal To) in http:#a25234566
allows you to specify the maximum number of "checked" boxes. If you try to check one more, it will get cleared.

Is this what you want?

by: quanmacPosted on 2009-09-01 at 12:40:03ID: 25235147

Just stop the last check from happening if its over the limit

That is what I need the script to do.

I've had to re-write some of the script code from ddayx10 to get rid of the javascript errors I was getting.

The errors I was getting was that it wasn't able to find the source element because it was missing: "ctl111_" in front of the element name. That's why I had do use indexOf to find the element name.

The alert box pops up, but I'm unable to get the last checked item to be unchecked when it goes over the limit.

Code Behind:
itm.Attributes.Add("onclick", "CheckForTotalClicks('" + chkAns.ClientID + "', '" + chkAns.ClientID + "_" + count + "', " + EvalQuestion.courEvalQTotalSelectableOptions + ")");
 
Javascript:
function CheckForTotalClicks(parent, source, maxChecked) 
    {
        //Check for total number of clicks
        var count = 0;
        var inputCollection = document.getElementsByTagName('input');
        var sourceName;
        for (i = 0; i < inputCollection.length; i++) {
            var e = inputCollection[i];
            if (e.type == 'checkbox' && e.checked && (e.name.indexOf(parent) >= 0)) 
            {
                count++;
                if (e.name.indexOf(source) >= 0) { sourceName = e.name; }
            }
        }
        if (count > maxChecked) {
            alert('Please select up to ' + maxChecked + ' topics');
            var src = document.getElementsByName(sourceName);
            src.checked = false;
        }
    }

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by: quanmacPosted on 2009-09-01 at 13:05:03ID: 25235396

So after a few more modifications, I've finally was able to get the script to work the way I want it to.

Although I don't think it is very efficient, but it is a working version and I can finally move on.

If you have suggestions on how to make it more efficient please post you solutions and I will take a look.

Thanks ddayx10, your posts definately helped me figure this out. Sorry HonorGod, I was never able to try out your code.

function CheckForTotalClicks(parent, source, maxChecked) 
    {
        //Check for total number of clicks
        var count = 0;
        var inputCollection = document.getElementsByTagName('input');
        for (i = 0; i < inputCollection.length; i++) {
            var e = inputCollection[i];
            if (e.type == 'checkbox' && e.checked && (e.name.indexOf(parent) >= 0)) 
            {
                count++;
            }
        }
        for (j = 0; j < inputCollection.length; j++) 
        {
            var unCheck = inputCollection[j];
            if (unCheck.type == 'checkbox' && unCheck.checked && (unCheck.name.indexOf(parent) >= 0)) {
                if (count > maxChecked && unCheck.name.indexOf(source) >= 0) {
                    alert('Please select up to ' + maxChecked + ' topics');
                    unCheck.checked = false;
                }
            }
        }
    }

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by: ddayx10Posted on 2009-09-01 at 13:20:56ID: 25235572

Well I have lots of thoughts about this, but to your one issue I think it may be here:

Your issue:
The alert box pops up, but I'm unable to get the last checked item to be unchecked when it goes over the limit.

Initial problem I see:
var src = document.getElementsByName(sourceName);

This is a collection in the current form and if you wanted to get your hands on an item in the collection you would need to supply an index which is likely 0 if you've gotten it right.:
var src = document.getElementsByName(sourceName)[index];

I'm not sure if that's going to make everything work out. The approach you've chosen is unusual. Some things are clearly unnecessary and even making things harder. Let's see if I can explain.

*****************************
l.Attributes.Add("onclick", "manageCheckBoxes('" + chkBoxL.ClientID + "',this,3);");

function manageCheckBoxes(parentID, source, maxChecked)
1) ParentID is going to be the clientID assigned to the checkboxlist (which will include the ctl_00_whatever nonsense). This can be used to get the actual checkboxlist (which is actually a <table>)

2) source is being assigned from the"this" keyword and is the input that was last clicked.

3) maxChecked I think is obvious.

Now, you're doing this:
var inputCollection = document.getElementsByTagName('input');

And I'm doing this:
var parent = document.getElementById(parentID);
var inputCollection = parent.getElementsByTagName('input');

Doing it your way requires all the e.type checking. My way only returns the inputs as a collection that are part of the checkboxlist (parent).

Trying to get the name of the input is just a mistake. If you pass in the "this" keyword. You don't have to find the element that was last clicked at all, you just have to call source.checked = false;

I appreciate that there was an error in my original code, but I have triple checked it and it works fine. I've made the modifications, and some comments that match to just remove the last item checked. I'll post it one more time and you can choose. I'm sorry if I made it harder for you.

****CODE BEHIND****
foreach (ListItem l in chkBoxL.Items)
{ l.Attributes.Add("onclick", "manageCheckBoxes('" + chkBoxL.ClientID + "',this,3);"); }
 
 
***ASPX PAGE****
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Managing CheckBoxList</title>
    <script type="text/javascript">
		
		var previouslyCheckedInput;
		
		//parentID = id assigned to the checkboxlist by asp.net
			//- used to get collection of inputs in checkboxlist
		//source = <input> element that was last checked, causing the function to be called
		//maxChecked = max number of inputs allowed checked
		function manageCheckBoxes(parentID, source, maxChecked)
		{
			var inputsChecked = 0; //counter for # inputs checked
			var parent = document.getElementById(parentID); //checkboxlist
			
			//by calling getElementsByTagName on the checkboxlist itself we only
			//get the checkboxes that are included, not all inputs on the page
			//we know these are all input of type "checkbox" so we dont have to evaluate that.
			var inputCollection = parent.getElementsByTagName('input');
			
			//simply counts the number of inputs in the checkboxlist that are checked
			for(i=0;i<inputCollection.length;i++)
			{
				if(inputCollection[i].checked)
				{ inputsChecked ++; }
			}
 
			//if we have more inputs selected than the max we use the "source" paremeter
			//(which is the this keyword, and therefore the input that cause the event to fire)
			//to uncheck the last input selected
			if(inputsChecked > maxChecked)
			{
				source.checked = false;
			}
		}
    
    </script>
</head>
<body>
    <form id="form1" runat="server">
 
		<asp:CheckBoxList ID="chkBoxL" runat="server">
			<asp:ListItem Text="Option1" Value="1" />
			<asp:ListItem Text="Option2" Value="2" />
			<asp:ListItem Text="Option3" Value="3" />
			<asp:ListItem Text="Option4" Value="4" />
			<asp:ListItem Text="Option5" Value="5" />
		</asp:CheckBoxList>
 
    </form>
</body>
</html>

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by: ddayx10Posted on 2009-09-01 at 13:25:33ID: 25235625

Cool I see you worked it out while I was typing a lengthy thing above...glad you got it.

by: HonorGodPosted on 2009-09-06 at 15:47:38ID: 25271908

Thanks for the assist and the points.

Good luck & have a great day.

20120131-EE-VQP-002

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Uncheck last item checked in a CheckBoxList

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.NET

C#

CheckBoxList

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Programming for ASP.NET

C# Programming Language

.NET Framework 2.x

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