如何使用下拉列表更新表单视图显示

本文关键字：视图 显示 表单 更新 何使用 下拉列表 | 更新日期: 2023-09-27 18:11:23

我搞不懂这个。

我有一个下拉列表(从一个数据源，连接名字和姓氏填充，值是一个"雇员ID"，哦，它是一个sql server数据库)。

我也有一个formview，显示所有的"员工"信息(相同的数据库，不同的sqldatasource。我要做的是，当用户从下拉列表中选择员工时，它会找到具有匹配员工ID的页面并显示该页。

formview还需要保持分页，以允许用户在需要时选择下一步或上一个。(如果ddl能够更新next和previous，以显示当前查看的员工，那就更好了)。

目前，我在formview中有一个ddl，带有

SelectedValue='<%# Eval("Employee_ID") %> (which I'm hoping will take care of the ddl showing part, haven't tested that bit as I just woke up,heh).

我在ddl中设置为true，并且它正在触发OnSelectedIndexChanged事件，我只是不确定下一步该做什么。(更具体地说，我想我不知道如何在c#中找到与"员工id"匹配的页面。

非常感谢您的帮助!

如何使用下拉列表更新表单视图显示

我认为这是一个很好的例子，如何绑定和更新表单视图使用下拉选择项目....

    <asp: ObjectDataSource ID="ObjectDataSource1" runat="server" DeleteMethod="Delete"
        InsertMethod="Insert" OldValuesParameterFormatString="original_{0}" SelectMethod="GetData"
        TypeName="DataSet1TableAdapters.teachersTableAdapter" UpdateMethod="Update">
     <DeleteParameters>
       <asp: Parameter Name="Original_PKID" Type="Int32" />
    </DeleteParameters>
    <UpdateParameters>
       <asp: Parameter Name="name" Type="String" />
       <asp: Parameter Name="lastname" Type="String" />
       <asp: Parameter Name="department" Type="Int32" />
       <asp: Parameter Name="PKID" Type="Int32" />
    </UpdateParameters>
    <InsertParameters>
         <asp: Parameter Name="name" Type="String" />
         <asp: Parameter Name="lastname" Type="String" />
         <asp: Parameter Name="department" Type="Int32" />
    </InsertParameters>
  </asp: ObjectDataSource>
    <br />
   <asp: ObjectDataSource ID="ObjectDataSource2" runat="server" DeleteMethod="Delete"
    InsertMethod="Insert" OldValuesParameterFormatString="original_{0}" SelectMethod="GetData"
    TypeName="DataSet1TableAdapters.departmentsTableAdapter" UpdateMethod="Update">
    <DeleteParameters>
        <asp: Parameter Name="Original_PKID" Type="Int32" />
    </DeleteParameters>
    <UpdateParameters>
       <asp: Parameter Name="departmentName" Type="String" />
       <asp: Parameter Name="PKID" Type="Int32" />
    </UpdateParameters>
      <InsertParameters>
         <asp: Parameter Name="departmentName" Type="String" />
        </InsertParameters>
      </asp:ObjectDataSource></div><br />
      <asp: FormView ID="FormView1" runat="server" AllowPaging="True" DataKeyNames="PKID"
       DataSourceID="ObjectDataSource1" OnDataBound="FormView1_DataBound">
    <EditItemTemplate>
      PKID:
       <asp: Label ID="PKIDLabel1" runat="server" Text='<%# Eval("PKID") %>'></asp:Label><br />
       name:
        <asp: TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>'>
          </asp: TextBox><br />
        lastname:
       <asp: TextBox ID="lastnameTextBox" runat="server" Text='<%# Bind("lastname") %>'>
    </asp: TextBox><br />
       department:
        <asp: TextBox ID="departmentTextBox" runat="server" Text='<%# Bind("department") %>'>
         </asp:TextBox><br />
       <asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update"
          Text="Update">
      </asp: LinkButton>
         <asp: LinkButton ID="UpdateCancelButton" runat="server" CausesValidation="False"             CommandName="Cancel"
    Text="Cancel">
         </asp: LinkButton>
     </EditItemTemplate>
    <InsertItemTemplate>
    name:
    <asp: TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>'>
    </asp: TextBox><br />
    lastname:
    <asp: TextBox ID="lastnameTextBox" runat="server" Text='<%# Bind("lastname") %>'>
    </asp: TextBox><br />
    department:
    <asp: TextBox ID="departmentTextBox" runat="server" Text='<%# Bind("department") %>'>
    </asp: TextBox><br />
    <asp: LinkButton ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert"
    Text="Insert">
    </asp: LinkButton>
    <asp: LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
    Text="Cancel">
    </asp: LinkButton>
    </InsertItemTemplate>
    <ItemTemplate>
    PKID:
    <asp: Label ID="PKIDLabel" runat="server" Text='<%# Eval("PKID") %>'></asp:Label><br />
    name:
    <asp: Label ID="nameLabel" runat="server" Text='<%# Bind("name") %>'></asp: Label><br />
    lastname:
    <asp: Label ID="lastnameLabel" runat="server" Text='<%# Bind("lastname") %>'></asp: Label><br />
    department:
    <asp: DropDownList ID="DropDownList1" runat="server" DataSourceID="ObjectDataSource2"
    DataTextField="departmentName" DataValueField="PKID">
    </asp: DropDownList><br />
    <asp: LinkButton ID="EditButton" runat="server" CausesValidation="False" CommandName="Edit"
    Text="Edit"></asp: LinkButton>
    <asp: LinkButton ID="DeleteButton" runat="server" CausesValidation="False" CommandName="Delete"
    Text="Delete"></asp: LinkButton>
    <asp: LinkButton ID="NewButton" runat="server" CausesValidation="False" CommandName="New"
    Text="New"></asp: LinkButton>
    </ItemTemplate>
    </asp: FormView>
In the code behind i used itemdatabound event of the formview so that i set the <strong class="highlight">selected</strong> value for the dropdownlist as follows : 

protected void FormView1_DataBound(object sender, EventArgs e)
{
        DataRowView drv = (DataRowView)FormView1.DataItem;
        ((DropDownList)FormView1.FindControl("DropDownList1")).SelectedValue = drv["department"].ToString();
 }
 protected void FormView1_DataBound(object sender, EventArgs e)
 {
        DataRowView drv = (DataRowView)FormView1.DataItem;
        ((DropDownList)FormView1.FindControl("DropDownList1")).SelectedValue = drv["department"].ToString();
 }
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