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Question

Where are the DataValueField values for a CheckBoxList stored?

Answer 1

+1 A:

Stored in ViewState, you cannot access them on the client without some hacking.

Jason Bunting 2008-10-07 20:25:58

Thanks. I guess I'll just need to build the checkboxlist with a repeater.

Herb Caudill 2008-10-08 00:35:19

Answer 2

A:

I've searched for this before and you may be close to little luck. I think i remember seeing that there isn't a checkbox list item for javascript, so it doesn't understand it. You'll have to search for items on the page that have the type of a check box and test to see what group (i think that's the property) that it belongs too.

I'll search my code and see if I can find what I did...

Of course, I can't find what I did.

Why are you doing it client side in javascript? Why don't you do some AJAX and control everything server side?

Miles 2008-10-07 20:26:47

FYI: Java and JavaScript are not the same, they are complete different languages.

Jason Bunting 2008-10-07 20:38:55

Answer 3

A:

To avoid hacking the checkbox list just use a repeater as such:

<asp:Repeater ID="rptItems" runat="server" DataSourceID="odsDataSource">
<ItemTemplate>
<input id="iptCheckBox" type="checkbox" runat="server" value='<%# Eval("Key") %>'><%# Eval("Value") %></input>
</ItemTemplate>
</asp:Repeater>

rjarmstrong 2008-10-21 14:46:24

Answer 4

A:

Try this to get datavalue in clientside..

<body>
     <form id="form1" runat="server">
          <div>
               <asp:CheckBoxList ID="CheckBoxList1" runat="server" DataTextField="tx" DataValueField="vl">
               </asp:CheckBoxList>
          </div>
          <input id="Button1" type="button" value="button" onclick="return Button1_onclick()" /> 
     </form>
</body>
<script type="text/javascript">

function Button1_onclick() 
{
var itemarr = document.getElementById("CheckBoxList1").getElementsByTagName("span");
var itemlen = itemarr.length;
     for(i = 0; i <itemlen;i++)
     {
          alert(itemarr[i].getAttribute("dvalue"));
     }
return false;
}


</script>

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("tx");
        dt.Columns.Add("vl");
        DataRow dr = dt.NewRow();
        dr[0] = "asdas";
        dr[1] = "1";
        dt.Rows.Add(dr);
        dr = dt.NewRow();
        dr[0] = "456456";
        dr[1] = "2";
        dt.Rows.Add(dr);
        dr = dt.NewRow();
        dr[0] = "yjryut";
        dr[1] = "3";
        dt.Rows.Add(dr);
        dr = dt.NewRow();
        dr[0] = "yjrfdgdfgyut";
        dr[1] = "3";
        dt.Rows.Add(dr);
        dr = dt.NewRow();
        dr[0] = "34534";
        dr[1] = "3";
        dt.Rows.Add(dr);
        CheckBoxList1.DataSource = dt;
        CheckBoxList1.DataBind();
        foreach (ListItem li in CheckBoxList1.Items)
        {
            li.Attributes.Add("dvalue", li.Value);
        }
    }
}

}

Swapna 2009-12-10 06:16:43

Answer 5

A:

Swapna, Your answer absolutely works. So in order to check if the check box in the ASP.Net Checkboxlist is checked and then accumulate the list as a comma-delimited string, you can do as

C# Code-behind

ChkboxList1.DataSource = dsData;
ChkboxList1.DataTextField = "your-display-column-name";
ChkboxList1.DataValueField = "your-identifier-column-name";
ChkboxList1.DataBind();

foreach (ListItem li in ChkboxList1.Items)
{
    li.Attributes.Add("DataValue", li.Value); 
}

Then in Javascript do

var selValues = "";

var ChkboxList1Ctl = document.getElementById("ChkboxList1");

var ChkboxList1Arr = null;

var ChkboxList1Attr= null;

if (ChkboxList1Ctl != null)

{

 ChkboxList1Arr = ChkboxList1Ctl.getElementsByTagName("INPUT");

 ChkboxList1Attr = ChkboxList1Ctl.getElementByTagName("span");

}

if (ChkboxList1Arr != null)

{

  for (var i = 0; i < ChkboxList1Arr.length; i++)

  {

     if (ChkboxList1Arr[i].checked)

         selValues += ChkboxList1Attr[i].getAttribute("DataValue") + ",";

  }

  if (selValues.length > 0)

     selValues = selValues.substr(0, selValues.length - 1);

}

-- LotusShiv

2010-08-23 16:12:06

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Where are the DataValueField values for a CheckBoxList stored?

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