Managing checkbox lists within a Repeater control utilizing asp.net

After populating the repeater control, my checkbox display is like this:

I have a couple of questions regarding this setup:

  1. If I check the box for Group 1, I want all the items under Group 1 to be automatically selected. How can I achieve this functionality?

  2. Additionally, I have a "Select All" button that should select all the items across all groups. Since the checkboxes are within the repeater control, I'm unsure about how to implement this feature.

  Group 1
       Item 1
       Item 2

    Group 2
       Item 3
       Item 4

    Group 3
       Item 5 
       Item 6




  ASPX : 

    <ol>
        <asp:Repeater ID="rp_Groups" runat="server" OnItemDataBound="rp_Groups_ItemDataBound">
            <ItemTemplate>
                <ul>
                    <asp:CheckBox RepeatColumns="2" runat="server" ID="chk_Group" Text='<%# Eval("category_type") %>' Value='<%# Eval("service_type_category_id") %>' onclick="OnGroupClick" />

                     <asp:CheckBoxList runat="server" ID="chkServiceType" style="padding-left:20px" DataValueField="ServiceTypeID" DataTextField="Name" EnableViewState="true"
                     ></asp:CheckBoxList>

                  <br />
                </ul>
            </ItemTemplate>
        </asp:Repeater>
    </ol>

<script type="text/javascript">
    function OnGroupClick(group) { 
  for(item in group.getElementsByTagName('input')) {
     item.checked = group.checked;
  }
}

   function selectAll() {
        $("#<%=chkServiceType.ClientID %> input[type=checkbox]").each(function () {
            this.checked = true;
        })
    }
</script>

Answer №1

To implement the checkbox onclick event in a repeater's ItemDataBound event, you can follow the code below to call a JavaScript function.

protected void rp_Groups_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
     try
    {
        System.Web.UI.WebControls.CheckBox chk =  (System.Web.UI.WebControls.CheckBox)e.Item.FindControl("chk_Group");

        chk.Attributes.Add("onclick", "selectGroupAll("+chk.ClientID+");");
    }
     catch (Exception ex)
     {

     }

}

Next step is to create the following JavaScript functions:

1) Function for selecting all checkboxes in a group:

function selectGroupAll(chk) {         


            $(chk).parent().parent().find(":checkbox").attr("checked", true);

        }

2) Function for selecting all checkboxes on button click:

Create a JavaScript function and call it from the button click event.

function selectAll() {

            $(':checkbox').each(function () {
                this.checked = true;
            });
        }

Add a button to your form that calls the selectAll function:

 <input type="button" value="Select All" onclick="selectAll();" />

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