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标题: grid 模版列内dropdownlist 使用问题询问 [打印本页]

作者: liko1688 时间: 2013-3-27 13:17
标题: grid 模版列内dropdownlist 使用问题询问
在grid 模版列内放ID为ddltable的dropdownlist 并绑定ddltable_SelectedIndexChanged 事件

                        <x:Grid ID="gv_fileds" runat="server" BoxFlex="1" ShowBorder="true" EnableRowNumber="true"
                              DataKeyNames="name,type,len,COLUMN_KEY,IS_NULLABLE,auto" SortColumnIndex="0"
                              SortDirection="DESC" Title="表格资料">
                              <Columns>
                                 <x:BoundField DataField="name" SortField="name" Width="70px" HeaderText="栏位" />
                                 <x:TemplateField Width="120px" HeaderText="标题">
                                    <ItemTemplate>
                                          <asp:TextBox ID="caption" runat="server" Width="110px" Text='<%# Eval("Name") %>'></asp:TextBox>
                                    </ItemTemplate>
                                 </x:TemplateField>
                                 <x:TemplateField Width="420px" HeaderText="控件">
                                    <ItemTemplate>
                                          <asp

abel ID="Label1" runat="server" Text="表" Visible="False"></asp

abel>
<asp

ropDownList ID="ddltable" runat="server" Width="90px" Visible="False" AutoPostBack="True" OnSelectedIndexChanged="ddltable_SelectedIndexChanged" >
</asp

ropDownList>
<asp

abel ID="Label2" runat="server" Text="Text" Visible="False"></asp

abel>
<asp

ropDownList ID="ddltext" runat="server" Width="90px" Visible="False" >
</asp

ropDownList>
<asp

abel ID="Label3" runat="server" Text="Value" Visible="False"></asp

abel>
<asp

ropDownList ID="ddlvalue" runat="server" Width="90px" Visible="False">
</asp

ropDownList>
                                    </ItemTemplate>
                                 </x:TemplateField>

                              </Columns>
                        </x:Grid>

protected void ddltable_SelectedIndexChanged(object sender, EventArgs e)
      {
         for (int i = 0, count = gv_fileds.Rows.Count; i < count; i++)
         {
            GridRow row = gv_fileds.Rows[i];
            System.Web.UI.WebControls.DropDownList ddltable = (System.Web.UI.WebControls.DropDownList)row.FindControl("ddltable");
            System.Web.UI.WebControls.DropDownList ddltext = (System.Web.UI.WebControls.DropDownList)row.FindControl("ddltext");
            System.Web.UI.WebControls.DropDownList ddlvalue = (System.Web.UI.WebControls.DropDownList)row.FindControl("ddlvalue");

                  if (ddltable.SelectedItem != null && ddltable.SelectedValue != "")
                  {
                     ddltext.DataSource = Utils.GetTable(string.Format(Utils.getflieds, ddltable.SelectedValue, txt_db.Text), txt_server.Text, txt_db.Text, txt_uid.Text, txt_pwd.Text);
                     ddltext.DataTextField = "name";
                     ddltext.DataValueField = "name";
                     ddltext.DataBind();
                     ddltext.Items.Insert(0, "");

                     ddlvalue.DataSource = Utils.GetTable(string.Format(Utils.getflieds, ddltable.SelectedValue, txt_db.Text), txt_server.Text, txt_db.Text, txt_uid.Text, txt_pwd.Text);
                     ddlvalue.DataTextField = "name";
                     ddlvalue.DataValueField = "name";
                     ddlvalue.DataBind();
                     ddlvalue.Items.Insert(0, "");
                  }
         }
         // 如果不是重新绑定数据，则需要手工调用UpdateTemplateFields来更新所有TemplateField中的值
         gv_fileds.UpdateTemplateFields();
      }

但这样写法会有问题
在row1如我已触发ddltable_SelectedIndexChanged，并在ddltext及ddlvalue选取数据。
在row2选取ddltable又会触发一次,row1的ddltext及ddlvalue又会重新绑定数据之前选好的数据就不见了。
请问该如何处理呢?

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