如何使用 C#2008 在 ASP.net 中的中继器标头中使用项目

Question

我在列标题中使用复选框，该复选框也可以是容器 Cehckboxes。

我想在中继器的标题中使用 chechBox，当选中此控件时，会选中行的复选框。

我该怎么做？

Answer 1

最好的答案是客户端 JavaScript。您可以使用 controlName.clientID 获取控件的 id 并将其编码到 javascript 中。

但这里是天真的 Dotnet 唯一答案：

给定中继器：

    <asp:Repeater ID="Repeater1" runat="server">
    <HeaderTemplate>
       <div> <asp:CheckBox ID="CheckBox1" runat="server" OnCheckedChanged="SetAllChecks" AutoPostBack="true" /></div>
    <hr />
    </HeaderTemplate>
    <ItemTemplate>
       <div> <asp:CheckBox ID="CheckBox2" Checked='<%# Container.DataItem("isChecked") %>' runat="server" /></div>
    </ItemTemplate>
    </asp:Repeater>

和代码隐藏：

Imports System.Data  
Imports System.Collections

Partial Class _Default  
Inherits System.Web.UI.Page  

Public Sub SetAllChecks(ByVal sender As Object, ByVal e As System.EventArgs)  
    Dim amIChecked As CheckBox = CType(sender, CheckBox)  

    Dim rowCt As Integer = Repeater1.Items.Count  
    Dim ridx As Integer = 0  
    For ridx = 0 To rowCt - 1  
        Dim cbox As CheckBox = CType(Repeater1.Items(ridx).FindControl("CheckBox2"), CheckBox)  
        cbox.Checked = amIChecked.Checked  
    Next  

End Sub  

Public Sub Repeater1_OnItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles Repeater1.ItemDataBound

End Sub

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Not Page.IsPostBack Then
        Dim dt As New DataTable()
        dt.Columns.Add(New DataColumn("isChecked"))
        Dim tmprow As DataRow = dt.NewRow()
        tmprow("isChecked") = True
        dt.Rows.Add(tmprow)
        tmprow = dt.NewRow()
        tmprow("isChecked") = False
        dt.Rows.Add(tmprow)
        tmprow = dt.NewRow()
        tmprow("isChecked") = False
        dt.Rows.Add(tmprow)
        tmprow = dt.NewRow()
        tmprow("isChecked") = False
        dt.Rows.Add(tmprow)
        tmprow = dt.NewRow()
        tmprow("isChecked") = False
        dt.Rows.Add(tmprow)

        Repeater1.DataSource = dt
        Repeater1.DataBind()

    End If

End Sub

结束类

Answer 2

这可以通过 jQuery 轻松实现。假设您有由中继器生成的下表：

<table>
  <thead>
      <tr>
          <th><input type="checkbox" name="headerchk" id="headerchk" /></th>
      </tr>
  </thead>
  <tbody>
      <tr>
          <td><input type="checkbox" name="chk1" id="garbage1_added_my_repeater_chk" /></td>
      </tr>
      <tr>
          <td><input type="checkbox" name="chk2" id="garbage2_added_my_repeater_chk" /></td>
      </tr>
      <tr>
          <td><input type="checkbox" name="chk3" id="garbage3_added_my_repeater_chk" /></td>
      </tr>
  </tbody>
</table>

然后您可以为标题中的复选框分配一个事件处理程序，该事件处理程序将切换所有其他复选框：

$(function() {
    $('#headerchk').change(function() {
        // Toggle all inputs of type checkbox and with ids starting with chk:
        $('input[type=checkbox][id$=chk]').attr('checked', this.checked);
    });
});

Answer 3

以下是 Bill 答案中的相关 C# 代码：

public void SetAllChecks(object sender, EventArgs e)
{
    CheckBox amIChecked = (CheckBox)sender;
    foreach (RepeaterItem ri in Repeater1.Items)
    {
        CheckBox cbox = (CheckBox)ri.FindControl("CheckBox2");
        cbox.Checked = amIChecked.Checked;
    }
}

Answer 4

CheckBox Checkall = SendBoxrep.Controls[0].Controls[0].FindControl("Checkall") as CheckBox;