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Dropdownlist不会更新后添加更新面板

2013-08-01 62 views
0

我有多个下拉列表框中查询同一列，同一个表和同一个数据库。例如，在memberID列下我有以下ID。Dropdownlist不会更新后添加更新面板

，我有3个不同的下拉列表框，如图所示下面

<asp:DropDownList ID="memberID3" runat="server" Visible="false" OnSelectedIndexChanged="ddlpid3_SelectedIndexChanged" > 
    </asp:DropDownList> 
    <asp:DropDownList ID="memberID1" runat="server" Visible="false" OnSelectedIndexChanged="ddlpid1_SelectedIndexChanged"> 
    </asp:DropDownList> 
    <asp:DropDownList ID="memberID2" runat="server" Visible="false" OnSelectedIndexChanged="ddlpid2_SelectedIndexChanged"> 
    </asp:DropDownList>

我添加了下拉列表之间更新面板以便允许我的下拉列表刷新任何更新/选择。

<asp:UpdatePanel ID="UpdatePanel1" runat="server"> 
    <ContentTemplate> 
    </ContentTemplate> 
    </asp:UpdatePanel>

例如，当选择memberID1 12345，其他2下拉列表（memberID2和3）将不显示ID 12345反之亦然，当memberID1选择下拉列表的默认值，则ID重新出现在其他2 dropdownlistbox。我为所有的DDL添加了默认值。

memeberID(number).Items.Insert(0, new ListItem(" Please select a Member ID", "")); 
memeberID(number).SelectedIndex = 0;

如果我没有弄错更新面板的属性，是不是可以使这个功能工作？

这里是要求的绑定代码。

protected void ddllocation_SelectedIndexChanged(object sender, EventArgs e) 
    { 

     using (var connAdd = new SqlConnection("Data Source = localhost; Initial Catalog = MajorProject; Integrated Security= SSPI")) 
     { 
      connAdd.Open(); 

      var sql = "Select policeid from PoliceAccount where status ='available' and handle ='offcase' and postedto='" + ddllocation.SelectedValue + "'"; 
      using (var cmdAdd = new SqlDataAdapter(sql, connAdd)) 
      { 
       DataSet ds2 = new DataSet(); 
       cmdAdd.Fill(ds2); 

       memberID1.Items.Clear(); 
       memberID1.DataSource = ds2; 
       memberID1.DataTextField = "memberID"; 
       memberID1.DataValueField = "memberID"; 
       memberID1.DataBind(); 
       memberID1.Items.Insert(0, new ListItem("Please select a Member ID", "")); 
       memberID1.SelectedIndex = 0; 

       memberID2.Items.Clear(); 
       memberID2.DataSource = ds2; 
       memberID2.DataTextField = "memberID"; 
       memberID2.DataValueField = "memberID"; 
       memberID2.DataBind(); 
       memberID2.Items.Insert(0, new ListItem("Please select a Member ID", "")); 
       memberID2.SelectedIndex = 0; 

       memberID3.Items.Clear(); 
       memberID3.DataSource = ds2; 
       memberID3.DataTextField = "memberID"; 
       memberID3.DataValueField = "memberID"; 
       memberID3.DataBind(); 
       memberID3.Items.Insert(0, new ListItem("Please select a Member ID", "")); 
       memberID3.SelectedIndex = 0; 



      }

UPDATE

现在我能够让我的其他DDL来重新绑定，并选择默认值时，缓存中的其他下拉列表选择的值。但是，当我选择其他ID时，ID将被删除，并且不会重新绑定另一个ddl。

protected void FillddlLocations() 
    { 
     FillDropdown(ddlpid1); 
     FillDropdown(ddlpid2); 
     FillDropdown(ddlpid3); 
     FillDropdown(ddlpid4); 
     FillDropdown(ddlpid5); 
     ddlpid1.Visible = false; 
     ddlpid2.Visible = false; 
     ddlpid3.Visible = false; 
     ddlpid4.Visible = false; 
     ddlpid5.Visible = false; 
    } 

    protected void FillDropdown(DropDownList ddl) 
    { 

     using (var connAdd = new SqlConnection("Data Source = localhost; Initial Catalog = MajorProject; Integrated Security= SSPI")) 
     { 
      connAdd.Open(); 

      var sql = "Select policeid from PoliceAccount where status ='available' and handle ='offcase' and postedto='" + ddllocation.SelectedValue + "'"; 
      using (var cmdAdd = new SqlDataAdapter(sql, connAdd)) 
      { 
       DataSet ds2 = new DataSet(); 
       cmdAdd.Fill(ds2); 

       ddl.Items.Clear(); 
       ddl.DataSource = ds2; 
       ddl.DataBind(); 
       ddl.Items.Insert(0, new ListItem("Police ID", "")); 
       ddl.SelectedIndex = 0; 

      } 

     } 
    } 

    protected void ddlpid1_SelectedIndexChanged(object sender, EventArgs e) 
    { 

     if (ddlpid1.SelectedIndex > 0) 
     { 

      Session["pid1"] = ddlpid1.SelectedValue; 

      ListItem removeItem2 = ddlpid2.Items.FindByValue(ddlpid1.SelectedValue); 
      ddlpid2.Items.Remove(removeItem2); 
      ListItem removeItem3 = ddlpid3.Items.FindByValue(ddlpid1.SelectedValue); 
      ddlpid3.Items.Remove(removeItem3); 
      ListItem removeItem4 = ddlpid4.Items.FindByValue(ddlpid1.SelectedValue); 
      ddlpid4.Items.Remove(removeItem4); 
      ListItem removeItem5 = ddlpid5.Items.FindByValue(ddlpid1.SelectedValue); 
      ddlpid5.Items.Remove(removeItem5); 


     } 

     else 

     if (ddlpid1.SelectedItem.Text.Equals("Police ID")) 
     { 
      FillDropdown(ddlpid1); 
      FillDropdown(ddlpid2); 
      FillDropdown(ddlpid3); 
      FillDropdown(ddlpid4); 
      FillDropdown(ddlpid5); 


      ddlpid2.SelectedValue = (String)Session["pid2"]; 
      ddlpid2_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid3.SelectedValue = (String)Session["pid3"]; 
      ddlpid3_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid4.SelectedValue = (String)Session["pid4"]; 
      ddlpid4_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid5.SelectedValue = (String)Session["pid5"]; 
      ddlpid5_SelectedIndexChanged(this, EventArgs.Empty); 
     } 





    } 

    protected void ddlpid2_SelectedIndexChanged(object sender, EventArgs e) 
    { 

     if (ddlpid2.SelectedIndex > 0) 
     { 

      Session["pid2"] = ddlpid2.SelectedValue; 
      ListItem removeItem1 = ddlpid1.Items.FindByValue(ddlpid2.SelectedValue); 
      ddlpid1.Items.Remove(removeItem1); 
      ListItem removeItem3 = ddlpid3.Items.FindByValue(ddlpid2.SelectedValue); 
      ddlpid3.Items.Remove(removeItem3); 
      ListItem removeItem4 = ddlpid4.Items.FindByValue(ddlpid2.SelectedValue); 
      ddlpid4.Items.Remove(removeItem4); 
      ListItem removeItem5 = ddlpid5.Items.FindByValue(ddlpid2.SelectedValue); 
      ddlpid5.Items.Remove(removeItem5); 


     } 
     else if (ddlpid2.SelectedItem.Text.Equals("Police ID")) 
     { 
      FillDropdown(ddlpid1); 
      FillDropdown(ddlpid2); 
      FillDropdown(ddlpid3); 
      FillDropdown(ddlpid4); 
      FillDropdown(ddlpid5); 

      ddlpid1.SelectedValue = (String)Session["pid1"]; 
      ddlpid1_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid3.SelectedValue = (String)Session["pid3"]; 
      ddlpid3_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid4.SelectedValue = (String)Session["pid4"]; 
      ddlpid4_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid5.SelectedValue = (String)Session["pid5"]; 
      ddlpid5_SelectedIndexChanged(this, EventArgs.Empty); 
     } 


    } 

    protected void ddlpid3_SelectedIndexChanged(object sender, EventArgs e) 
    {   
     if (ddlpid3.SelectedIndex > 0) 
     { 

      Session["pid3"] = ddlpid3.SelectedValue; 
      ListItem removeItem1 = ddlpid1.Items.FindByValue(ddlpid3.SelectedValue); 
      ddlpid1.Items.Remove(removeItem1); 
      ListItem removeItem2 = ddlpid2.Items.FindByValue(ddlpid3.SelectedValue); 
      ddlpid2.Items.Remove(removeItem2); 
      ListItem removeItem4 = ddlpid4.Items.FindByValue(ddlpid3.SelectedValue); 
      ddlpid4.Items.Remove(removeItem4); 
      ListItem removeItem5 = ddlpid5.Items.FindByValue(ddlpid3.SelectedValue); 
      ddlpid5.Items.Remove(removeItem5); 


     } 
    else if (ddlpid3.SelectedItem.Text.Equals("Police ID")) 
     { 
      FillDropdown(ddlpid1); 
      FillDropdown(ddlpid2); 
      FillDropdown(ddlpid3); 
      FillDropdown(ddlpid4); 
      FillDropdown(ddlpid5); 

      ddlpid1.SelectedValue = (String)Session["pid1"]; 
      ddlpid1_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid2.SelectedValue = (String)Session["pid2"]; 
      ddlpid2_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid4.SelectedValue = (String)Session["pid4"]; 
      ddlpid4_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid5.SelectedValue = (String)Session["pid5"]; 
      ddlpid5_SelectedIndexChanged(this, EventArgs.Empty); 
     } 


    } 

    protected void ddlpid4_SelectedIndexChanged(object sender, EventArgs e) 
    {    
     if (ddlpid4.SelectedIndex > 0) 
     { 
      Session["pid4"] = ddlpid4.SelectedValue; 

      ListItem removeItem1 = ddlpid1.Items.FindByValue(ddlpid4.SelectedValue); 
      ddlpid1.Items.Remove(removeItem1); 
      ListItem removeItem2 = ddlpid2.Items.FindByValue(ddlpid4.SelectedValue); 
      ddlpid2.Items.Remove(removeItem2); 
      ListItem removeItem3 = ddlpid3.Items.FindByValue(ddlpid4.SelectedValue); 
      ddlpid3.Items.Remove(removeItem3); 
      ListItem removeItem5 = ddlpid5.Items.FindByValue(ddlpid4.SelectedValue); 
      ddlpid5.Items.Remove(removeItem5); 


     } 

     else if (ddlpid4.SelectedItem.Text.Equals("Police ID")) 
     { 


      FillDropdown(ddlpid1); 
      FillDropdown(ddlpid2); 
      FillDropdown(ddlpid3); 
      FillDropdown(ddlpid4); 
      FillDropdown(ddlpid5); 

      ddlpid1.SelectedValue = (String)Session["pid1"]; 
      ddlpid1_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid2.SelectedValue = (String)Session["pid2"]; 
      ddlpid2_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid3.SelectedValue = (String)Session["pid3"]; 
      ddlpid3_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid5.SelectedValue = (String)Session["pid5"]; 
      ddlpid5_SelectedIndexChanged(this, EventArgs.Empty); 
     } 


    }  

    protected void ddlpid5_SelectedIndexChanged(object sender, EventArgs e) 
    {   

     if (ddlpid5.SelectedIndex > 0) 
     { 

      Session["pid5"] = ddlpid5.SelectedValue; 
      ListItem removeItem1 = ddlpid1.Items.FindByValue(ddlpid5.SelectedValue); 
      ddlpid1.Items.Remove(removeItem1); 
      ListItem removeItem2 = ddlpid2.Items.FindByValue(ddlpid5.SelectedValue); 
      ddlpid2.Items.Remove(removeItem2); 
      ListItem removeItem3 = ddlpid3.Items.FindByValue(ddlpid5.SelectedValue); 
      ddlpid3.Items.Remove(removeItem3); 
      ListItem removeItem4 = ddlpid4.Items.FindByValue(ddlpid5.SelectedValue); 
      ddlpid4.Items.Remove(removeItem4); 

     } 

    else if (ddlpid5.SelectedItem.Text.Equals("Police ID")) 
     { 
      FillDropdown(ddlpid1); 
      FillDropdown(ddlpid2); 
      FillDropdown(ddlpid3); 
      FillDropdown(ddlpid4); 
      FillDropdown(ddlpid5); 

      ddlpid1.SelectedValue = (String)Session["pid1"]; 
      ddlpid1_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid2.SelectedValue = (String)Session["pid2"]; 
      ddlpid2_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid3.SelectedValue = (String)Session["pid3"]; 
      ddlpid3_SelectedIndexChanged(this, EventArgs.Empty); 

      ddlpid4.SelectedValue = (String)Session["pid4"]; 
      ddlpid4_SelectedIndexChanged(this, EventArgs.Empty); 
     } 

    }

来源

2013-08-01 Teo Chuen Wei Bryan

+0

所以，你不希望下拉列表并行更新或你呢？ –

+0

平行更新是什么意思？ –

+1

你是否希望所有三个下拉列表在其中一个更新时具有相同的值，或者它们是否应该保持不同步？ –

回答

1

首先，我将设置的AutoPostBack属性的下拉列表中，以真正在我的标记：

<asp:DropDownList ID="memberID1" AutoPostBack="true" runat="server" Visible="false" OnSelectedIndexChanged="ddlpid1_SelectedIndexChanged"> 
    </asp:DropDownList> 
    <asp:DropDownList ID="memberID2" AutoPostBack="true" runat="server" Visible="false" OnSelectedIndexChanged="ddlpid2_SelectedIndexChanged"> 
    </asp:DropDownList> 
    <asp:DropDownList ID="memberID3" AutoPostBack="true" runat="server" Visible="false" OnSelectedIndexChanged="ddlpid3_SelectedIndexChanged" > 
    </asp:DropDownList>

更新：我们可以存储选择的值在视图状态和重新建了dropdownlists后取回如下所示：

public partial class WebForm2 : System.Web.UI.Page 
{ 
    bool bFlag = true; 

    protected void Page_Load(object sender, EventArgs e) 
    { 
     if (!IsPostBack) 
     { 
      FillddlLocations(); 
     } 
    } 

    //Properties to store selected value in ViewState 

    protected string MemberID1Selection 
    { 
     get 
     { 
      if (ViewState["MemberID1Selection"] != null) 
       return ViewState["MemberID1Selection"].ToString(); 
      return ""; 
     } 
     set { ViewState["MemberID1Selection"] = value; } 
    } 

    protected string MemberID2Selection 
    { 
     get 
     { 
      if (ViewState["MemberID2Selection"] != null) 
       return ViewState["MemberID2Selection"].ToString(); 
      return ""; 
     } 
     set { ViewState["MemberID2Selection"] = value; } 
    } 

    protected string MemberID3Selection 
    { 
     get 
     { 
      if (ViewState["MemberID3Selection"] != null) 
       return ViewState["MemberID3Selection"].ToString(); 
      return ""; 
     } 
     set { ViewState["MemberID3Selection"] = value; } 
    } 


    protected void FillddlLocations() 
    { 
     FillDropdown(memberID1); 
     FillDropdown(memberID2); 
     FillDropdown(memberID3); 
     memberID1.Visible = true; 
     memberID2.Visible = true; 
     memberID3.Visible = true; 
    } 

    protected void FillDropdown(DropDownList ddl) 
    { 

     using (var connAdd = new SqlConnection("Data Source = localhost; Initial Catalog = MajorProject; Integrated Security= SSPI")) 
     { 
      connAdd.Open(); 

      var sql = "Select policeid from PoliceAccount where status ='available' and handle ='offcase' and postedto='" + ddllocation.SelectedValue + "'"; 
      using (var cmdAdd = new SqlDataAdapter(sql, connAdd)) 
      { 
       DataSet ds2 = new DataSet(); 
       cmdAdd.Fill(ds2); 


       ddl.Items.Clear(); 
       ddl.DataSource = ds2; 
       ddl.DataTextField = "memberID"; 
       ddl.DataValueField = "memberID"; 
       ddl.DataBind(); 
       ddl.Items.Insert(0, new ListItem("Please select a Member ID", "")); 
       ddl.SelectedIndex = 0; 

      } 

     } 
    } 

    protected void IndexChanged(DropDownList ddlChanged, DropDownList ddlToFilter1, DropDownList ddlToFilter2) 
    { 
     string removeValue1 = ddlChanged == memberID1 ? MemberID1Selection : (ddlChanged == memberID2 ? MemberID2Selection : MemberID3Selection); 
     string selValue2 = ddlChanged == memberID1 ? MemberID2Selection : (ddlChanged == memberID2 ? MemberID1Selection : MemberID1Selection); 
     string selValue3 = ddlChanged == memberID1 ? MemberID3Selection : (ddlChanged == memberID2 ? MemberID3Selection : MemberID2Selection); 

     bFlag = false;//Prevent fireing the code again while changing the index 
     if (removeValue1 != "") 
     { 
      ListItem item1 = ddlToFilter1.Items.FindByValue(removeValue1); 
      ddlToFilter1.Items.Remove(item1); 
      ListItem item2 = ddlToFilter2.Items.FindByValue(removeValue1); 
      ddlToFilter2.Items.Remove(item2);    
     } 

     if (selValue3 != "") 
     { 
      ListItem item3 = ddlToFilter1.Items.FindByValue(selValue3); 
      ddlToFilter1.Items.Remove(item3); 
     } 
     if (selValue2 != "") 
     { 
      ListItem item4 = ddlToFilter2.Items.FindByValue(selValue2); 
      ddlToFilter2.Items.Remove(item4); 
     } 

     bFlag = false; 
     ddlToFilter1.SelectedIndex = ddlToFilter1.Items.IndexOf(ddlToFilter1.Items.FindByValue(selValue2)); 
     ddlToFilter2.SelectedIndex = ddlToFilter2.Items.IndexOf(ddlToFilter2.Items.FindByValue(selValue3)); 
    } 

    protected void ddlpid1_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     MemberID1Selection = memberID1.SelectedValue; 
     if (bFlag) 
     { 
      FillDropdown(memberID2); 
      FillDropdown(memberID3); 
      IndexChanged(memberID1, memberID2, memberID3); 
     } 
    } 

    protected void ddlpid2_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     MemberID2Selection = memberID2.SelectedValue; 
     if (bFlag) 
     { 
      FillDropdown(memberID1); 
      FillDropdown(memberID3); 
      IndexChanged(memberID2, memberID1, memberID3); 
     } 
    } 
    protected void ddlpid3_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     MemberID3Selection = memberID3.SelectedValue; 
     if (bFlag) 
     { 
      FillDropdown(memberID1); 
      FillDropdown(memberID2); 
      IndexChanged(memberID3, memberID1, memberID2); 
     } 
    } 
}

我测试了代码，它正在为我工​​作。希望能帮助到你！

来源

2013-08-01 05:13:26 afzalulh

+0

不帮助。抱歉。 –

+0

@Teo Chuen Wei Bryan-我已编辑我的回答 – afzalulh

+0

似乎不工作 –

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