DataBound CheckBoxList | 易学教程

问题

I have a website programmed in Asp.Net and use a ListView for displaying data. The data is coming from a LinqDataSource.

In my EditItemTemplate I have a CheckBoxList which consist of:

<asp:CheckBoxList runat="server" ID="TypeCheckBoxList" RepeatColumns="2">
 <asp:ListItem Value="128">6.-10. klasse<br />Norddjurs vejleder</asp:ListItem>
 <asp:ListItem Value="64">6.-10. klasse<br />Syddjurs vejleder</asp:ListItem>
 <asp:ListItem Value="32">Gået ud af skolen<br/>Norddjurs vejleder</asp:ListItem>
 <asp:ListItem Value="16">Gået ud af skolen<br/>Syddjurs vejleder</asp:ListItem>
 <asp:ListItem Value="8">Ekstra støtte<br/>Norddjurs vejleder</asp:ListItem>
 <asp:ListItem Value="4">Ekstra støtte<br />Syddjurs vejleder</asp:ListItem>
 <asp:ListItem Value="2">Kontakt</asp:ListItem>
 <asp:ListItem Value="1">Om os<br />Medarbejdere</asp:ListItem>
</asp:CheckBoxList>

I have a column called Type in my db and it is a tinyint. Therefore I can say (byte)Eval("Type").

But how do I databind my Eval("Type") to the CheckBoxList so if Eval("Type") is 3, then the two last items are selected?

I have tried setting a hidden value which binds to Type and then in the CheckBoxList OnLoad setting the selected items. But that did'nt work.

回答1:

That's the way to do it, with the hidded value binding to Type, but on the ItemDataBound event of the ListView.

So the event would look something like this:

protected void ListViewId_ItemDataBound (object sender, ListViewItemEventArgs e)
{
    HiddenField hdfType = (HiddenField)e.Item.FindControl("hdfType");
    CheckBoxList TypeCheckBoxList = (HiddenField)e.Item.FindControl("TypeCheckBoxList");

    // and you put the hidden just for EditItem and do:
    if (hdfType != null)
        foreach (ListItem item in TypeCheckBoxList.Items)
            if (int.Parse(item.Value) < int.Parse(hdfType.Value))
                item.Selected = true;
}

(I wrote all of this from my head, so there might be some small mistakes)

回答2:

First you should write a javascript function like this

function Selected(value,type)

{

   if(value<type)
    return true;
   else
    return false;
}



<asp:ListItem Value="32" Selected= javascript:function Selected(32,Eval("Type"))>Gået ud af skolen<br />Norddjurs vejleder</asp:ListItem>    
<asp:ListItem Value="16" Selected= javascript:function Selected(16,Eval("Type")>Gået ud af skolen<br />Syddjurs vejleder</asp:ListItem>

little bit modification may be required to finalize it..major focus on Selected attribute

来源：https://stackoverflow.com/questions/1458390/databound-checkboxlist

标签

ASP.NET

data-binding

listview

checkboxlist