来自数据集中XML的CascadingDropDown

时间：2014-02-24 19:48:12

标签： c# asp.net xml dataset

我试图让这项工作在很多方面起作用，我感到很沮丧，因为它们都不起作用。这是我得到的最接近的。我正在尝试从XML文件中填充三个级联下拉列表。我尝试过不同的XML配置，但我仍然不确定我使用的是否正确。如果从第二个下拉列表中进行特定选择，则仅填充第三个下拉列表。否则它应该是不活动的。

第一个下拉列表填充正常但第二个下拉列表在启用后为空白。

这是我的aspx代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CascadingDropDownList.aspx.cs" Inherits="CSASPNETCascadingDropDownList.CascadingDropDownListWithPostBack" EnableEventValidation="false" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>View CascadingDropDownList With PostBack</title>
    <%-- The follow javascript is the work around of EventValidation in FireFox --%>

<script type="text/javascript">
    var hdfDdl = null; // Save city dropdownlist selected option
    var ddlJobTitle2 = null;

    // Restore the selected option in city dropdownlist when page is rendering
    window.onload = function () {
        hdfDdl = document.getElementById('hdfDdlJobTitle2SelectedIndex');
        ddlJobTitle2 = document.getElementById('ddlJobTitle2');
        ddlJobTitle2.selectedIndex = hdfDdl.value;
        EnableOrDisableButton(false);
    }

    // Save city dropdownlist selected option when selected option is changed in city dropdownlist
    function onChange() {
        hdfDdl.value = ddlJobTitle2.selectedIndex;
    }

    // Enable or diasble submit button
    function EnableOrDisableButton(ToF) {
        document.getElementById('Button1').disabled = ToF;
    }
</script>

</head>
<body>
    <form id="form1" runat="server">
       <table class="style2">
        <tr>
          <td style="width:20px"></td>
          <td style="width:440px" colspan="2"> Place of Employment</td>
          <td> Professional Affiliation</td>
          <td> Specialty</td>
        </tr>
        <tr>
          <td style="width:20px">&nbsp;</td>
          <td colspan="2"><asp:DropDownList runat="server" id="ddlOrg" style="width:220px" AutoPostBack="true" OnSelectedIndexChanged="ddlOrg_SelectedIndexChanged">
            </asp:DropDownList>
            <br /><asp:Label ID="LabelOrg" runat="server"></asp:Label>
            </td>
          <td><asp:DropDownList runat="server" id="ddlJobTitle1" style="width:220px" AutoPostBack="true" OnSelectedIndexChanged="ddlJobTitle1_SelectedIndexChanged">
              </asp:DropDownList>
            <br />
                          <asp:Label ID="LabelJobTitle1" runat="server"></asp:Label>
           </td>
          <td><asp:DropDownList runat="server" id="ddlJobTitle2" onChange="onChange()" style="width:220px">
            </asp:DropDownList>
            <br />
            <asp:Label ID="LabelJobTitle2" runat="server"></asp:Label></td>
        </tr>
        <tr>
          <td style="width:20px"></td>
          <td style="width:220px"><asp:HiddenField runat="server" id="hdfDdlOrgSelectedIndex"></asp:HiddenField><br /><div id="OrgVal"></div></td>
          <td style="width:220px"></td>
          <td><asp:HiddenField runat="server"  id="hdfDdlJobTitle1SelectedIndex"></asp:HiddenField><br /><div id="JobTItle1Val"></div></td>
          <td><asp:HiddenField runat="server"  id="hdfDdlJobTitle2SelectedIndex"></asp:HiddenField><br /><div id="JobTitle2Val"></div>

          </td>
        </tr>
           </table>
               <asp:Button ID="Button1" runat="server" Text="Submit" OnClick="Button1_Click"
            Width="66px" />
        <br />
        <br />
        <asp:Label ID="LabelResult" runat="server"></asp:Label>
     </form>
</body>
</html>

这是文件后面的cs代码：

using System;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace CSASPNETCascadingDropDownList
{
    public partial class CascadingDropDownListWithPostBack : System.Web.UI.Page
    {
        /// <summary>
        /// Page Load event
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {

                PopulateDDLFromXMLFile();  

                //Bind Org dropdownlist
                //BindddlOrg();
                ddlJobTitle1.Enabled = false;
                ddlJobTitle2.Enabled = false;

                // Insert one item to dropdownlist top
                ddlJobTitle1.Items.Insert(0, new ListItem("Select JobTitle1", "-1"));
                ddlJobTitle2.Items.Insert(0, new ListItem("Select JobTitle2", "-1"));

                // Initialize JobTitle2 dropdownlist selected index
                hdfDdlJobTitle2SelectedIndex.Value = "0";
            }
        }

        //populates the dropdownlist from xml file  
        public void PopulateDDLFromXMLFile()
        {
            DataSet ds = new DataSet();
            ds.ReadXml(MapPath("App_Data") + "\\XMLFile1.xml");

            //get the dataview of tables, which is default table name  
            DataView dv = ds.Tables["organization"].DefaultView;
            DataView dj = ds.Tables["job"].DefaultView;
            DataView dp = ds.Tables["specialty"].DefaultView;
            //or we can use:  
            //DataView dv = ds.Tables[0].DefaultView;  

            //Now sort the DataView by column name "Name"  
           // dv.Sort = "Name";

            //now define datatext field and datavalue field of dropdownlist  
            ddlOrg.DataTextField = "name";
            ddlOrg.DataValueField = "value";
            ddlJobTitle1.DataTextField = "name";
            ddlJobTitle1.DataValueField = "value";
            ddlJobTitle2.DataTextField = "name";
            ddlJobTitle2.DataValueField = "value";

            //now bind the dropdownlist to the dataview  
            ddlOrg.DataSource = dv;
            ddlOrg.DataBind();
            ddlJobTitle1.DataSource = dj;
            ddlJobTitle1.DataBind();
            ddlJobTitle2.DataSource = dp;
            ddlJobTitle2.DataBind();

            //insert new list item as helper
            ddlOrg.Items.Insert(0, new ListItem("Select Organisation", "-1"));
            ddlJobTitle1.Items.Insert(0, new ListItem("Select Professional Affiliation", "-1"));
            ddlJobTitle2.Items.Insert(0, new ListItem("Select Specialty", "-1"));



        }  


        /// <summary>
        /// Bind Org dropdownlist
        /// </summary>

        protected void ddlOrg_SelectedIndexChanged(object sender, EventArgs e)
        {
            Bind();
        }

        private void Bind()
        {
            DataSet ds = new DataSet();
            ds.ReadXml(Server.MapPath("App_Data") + "\\XMLFile1.xml");
            ddlJobTitle1.DataTextField = "name";
            ddlJobTitle1.DataValueField = "value";
            DataView view = new DataView(ds.Tables["job"]);
            view.RowFilter = "value='" + ddlOrg.SelectedValue + "'";
            ddlJobTitle1.Enabled = true;
            ddlJobTitle1.DataSource = view;
            ddlJobTitle1.DataBind();
        } 

        /// <summary>
        /// JobTitle1 dropdownlist SelectedIndexChanged event
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void ddlJobTitle1_SelectedIndexChanged(object sender, EventArgs e)
        {
            // Bind JobTitle2 dropdownlist based on JobTitle1 value
            string strJobTitle1 = string.Empty;
            strJobTitle1 = ddlJobTitle1.SelectedValue;
            DataSet ds = new DataSet();
            ds.ReadXml(Server.MapPath("App_Data") + "\\XMLFile1.xml");
            ddlJobTitle1.DataTextField = "name";
            ddlJobTitle1.DataValueField = "value";
            DataView view = new DataView(ds.Tables["specialty"]);
            view.RowFilter = "value='" + ddlJobTitle1.SelectedValue + "'";
            ddlJobTitle2.Items.Clear();
            ddlJobTitle2.DataSource = view;
            ddlJobTitle2.DataBind();
            ddlJobTitle2.Items.Insert(0, new ListItem("Select Specialty", "-1"));

            // Initialize JobTitle2 dropdownlist selected index
            hdfDdlJobTitle2SelectedIndex.Value = "0";

            // Enable JobTitle2 dropdownlist when it has items

                ddlJobTitle2.Enabled = true;

       }

      /// <summary>
             /// Show selected value
             /// </summary>
             /// <param name="sender"></param>
             /// <param name="e"></param>
             protected void Button1_Click(object sender, EventArgs e)
             {
                 // Get the selected index of JobTitle2 dropdownlist
                 int iJobTitle2Selected = Convert.ToInt16(hdfDdlJobTitle2SelectedIndex.Value);

                 // The result will be showing
                 string strResult = string.Empty;
                 if (ddlOrg.SelectedIndex == 0)
                 {
                     strResult = "Please select a Org.";
                 }
                 else if (ddlJobTitle1.SelectedIndex == 0 && strResult == string.Empty)
                 {
                     strResult = "Please select a Professional Affiliation";
                 }
                 else if (hdfDdlJobTitle2SelectedIndex.Value == "0" && strResult == string.Empty)
                 {
                     strResult = "Please select a Specialty.";
                 }
                 else
                 {
                     strResult = "You selected Org: " + ddlOrg.SelectedValue
                         + " ; JobTitle1: " + ddlJobTitle1.SelectedValue
                         + " ; JobTitle2: " + ddlJobTitle2.Items[iJobTitle2Selected].Value;
                 }

                 LabelResult.Text = strResult;
             }
    }
}

这是XML：

<?xml version="1.0" encoding="utf-8"?>
<dropdowns>
  <organizations>
    <organization>
      <value>A0EAD6A8813E474B9F9A3E0C64D72F61</value>
      <name>Hospital</name>
    </organization>
    <organization>
      <value>DD8BE886FA18401E9CF30AC64B49ACD8</value>
      <name>Sleep Lab</name>
    </organization>
    <organization>
      <value>F8182C928BE14239A576895D39591D38</value>
      <name>Ventilation Home Service</name>
    </organization>
    <organization>
      <value>E3865431ECF9499692E79DBF2FBAA3B2</value>
      <name>Community Health Centre</name>
    </organization>
    <organization>
      <value>711AA0D43D6346FC9AD38659D9CB8840</value>
      <name>Home Care Provider</name>
    </organization>
    <organization>
      <value>D54FAE898ECF4AB4A92B99C5AA536910</value>
      <name>ResMed</name>
    </organization>
    <organization>
      <value>4E44CDB4F7E5426E99368194BBB73282</value>
      <name>Other</name>
    </organization>
  </organizations>
  <jobs>
    <job_organization name="Hospital">
      <job>
        <value>-2</value>
        <name>Physician</name>
      </job>
      <job>
        <value>111AEF6C39984713AA10E6F1D051F97E</value>
        <name>Nurse</name>
      </job>
      <job>
        <value>90CF5DB3D06A4B759F21A3F20B5F5DD4</value>
        <name>Physiologist</name>
      </job>
      <job>
        <value>55F8C6537718420DB6E4E3A7C087D540</value>
        <name>Physiotherapist</name>
      </job>
      <job>
        <value>884EB090E9B7469DA3CA8BA2D6FC4F4E</value>
        <name>Biomedical Engineer/Technician</name>
      </job>
      <job>
        <value>C2383AA850534CD9A4E03019386AA56C</value>
        <name>Administrator</name>
      </job>
      <job>
        <value>C8997E78569A4410956E5E7C6C1D57F2</value>
        <name>Manager</name>
      </job>
      <job>
        <value>5196E883DF614A319A3CDF4573C3E858</value>
        <name>Supplies/Procurement</name>
      </job>
    </job_organization>
    <job_organization name="Sleep Lab">
      <job>
        <value>D59C926B83A04E5297112FB599A8715F</value>
        <name>Physician</name>
      </job>
      <job>
        <value>111AEF6C39984713AA10E6F1D051F97E</value>
        <name>Nurse</name>
      </job>
      <job>
        <value>90CF5DB3D06A4B759F21A3F20B5F5DD4</value>
        <name>Physiologist</name>
      </job>
      <job>
        <value>3A5AAA4E5D474F3AAFC24D46B63BA073</value>
        <name>Respiratory Technician</name>
      </job>
      <job>
        <value>C2383AA850534CD9A4E03019386AA56C</value>
        <name>Administrator</name>
      </job>
      <job>
        <value>C8997E78569A4410956E5E7C6C1D57F2</value>
        <name>Manager</name>
      </job>
      <job>
        <value>ML.BASE.job.None</value>
        <name>Other</name>
    </job>
    </job_organization>
    <job_organization name="Ventilation Home Service">
      <job>
        <value>D59C926B83A04E5297112FB599A8715F</value>
        <name>Physician</name>
      </job>
      <job>
        <value>111AEF6C39984713AA10E6F1D051F97E</value>
        <name>Nurse</name>
      </job>
      <job>
        <value>55F8C6537718420DB6E4E3A7C087D540</value>
        <name>Physiotherapist</name>
      </job>
      <job>
        <value>3A5AAA4E5D474F3AAFC24D46B63BA073</value>
        <name>Respiratory Technician</name>
      </job>
      <job>
        <value>6E0D7BE08120464381FD70F4E07EAB4E</value>
        <name>Care Assistant</name>
      </job>
      <job>
        <value>C2383AA850534CD9A4E03019386AA56C</value>
        <name>Administrator</name>
      </job>
      <job>
        <value>F2D6388FF4CE49CDBFDEAB7D9DBEE9CF</value>
        <name>Biomedical Engineer</name>
      </job>
      <job>
        <value>C8997E78569A4410956E5E7C6C1D57F2</value>
        <name>Manager</name>
      </job>
      <job>
        <value>ML.BASE.job.None</value>
        <name>Other</name>
      </job>
    </job_organization>
    <job_organization name="Community Health Centre">
      <job>
        <value>D59C926B83A04E5297112FB599A8715F</value>
        <name>Physician</name>
      </job>
      <job>
        <value>318560B544674C2994131543FE67FF5E</value>
        <name>Dentist</name>
      </job>
      <job>
        <value>111AEF6C39984713AA10E6F1D051F97E</value>
        <name>Nurse</name>
      </job>
      <job>
        <value>C65378247CC6484BA56228E8102B5A1B</value>
        <name>Technician</name>
      </job>
      <job>
        <value>C2383AA850534CD9A4E03019386AA56C</value>
        <name>Administrator</name>
      </job>
      <job>
        <value>C8997E78569A4410956E5E7C6C1D57F2</value>
        <name>Manager</name>
      </job>
      <job>
        <value>ML.BASE.job.None</value>
        <name>Other</name>
      </job>
    </job_organization>
    <job_organization name="Home Care Provider">
      <job>
        <value>D59C926B83A04E5297112FB599A8715F</value>
        <name>Physician</name>
      </job>
      <job>
        <value>111AEF6C39984713AA10E6F1D051F97E</value>
        <name>Nurse</name>
      </job>
      <job>
        <value>55F8C6537718420DB6E4E3A7C087D540</value>
        <name>Physiotherapist</name>
      </job>
      <job>
        <value>C65378247CC6484BA56228E8102B5A1B</value>
        <name>Technician</name>
      </job>
      <job>
        <value>6E0D7BE08120464381FD70F4E07EAB4E</value>
        <name>Care Assistant</name>
      </job>
      <job>
        <value>C2383AA850534CD9A4E03019386AA56C</value>
        <name>Administrator</name>
      </job>
      <job>
        <value>C8997E78569A4410956E5E7C6C1D57F2</value>
        <name>Manager</name>
      </job>
      <job>
        <value>ML.BASE.job.None</value>
        <name>Other</name>
      </job>
    </job_organization>
    <job_organization name="ResMed">
      <job>
        <value>D59C926B83A04E5297112FB599A8715F</value>
        <name>Physician</name>
      </job>
      <job>
        <value>111AEF6C39984713AA10E6F1D051F97E</value>
        <name>Nurse</name>
      </job>
      <job>
        <value>55F8C6537718420DB6E4E3A7C087D540</value>
        <name>Physiotherapist</name>
      </job>
      <job>
        <value>C65378247CC6484BA56228E8102B5A1B</value>
        <name>Technician</name>
      </job>
      <job>
        <value>49CE2F9D94FA4A488D49B551C6C1A1DF</value>
        <name>Salesperson</name>
      </job>
      <job>
        <value>51ACA74CB1D74BD890AB19260C188FE8</value>
        <name>Product Manager</name>
      </job>
      <job>
        <value>C2383AA850534CD9A4E03019386AA56C</value>
        <name>Admin</name>
      </job>
      <job>
        <value>C8997E78569A4410956E5E7C6C1D57F2</value>
        <name>Manager</name>
      </job>
      <job>
        <value>EAAD4174C6AC48B19D90949289AB8A39</value>
        <name>Authorised ResMed Distributor</name>
      </job>
      <job>
        <value>ML.BASE.job.None</value>
        <name>Other</name>
      </job>
    </job_organization>
    <job_organization name="Other">
      <job>
        <value>5196E883DF614A319A3CDF4573C3E858</value>
        <name>Supplies/Procurement</name>
      </job>
    </job_organization>
  </jobs>
  <specialties>
    <specialty_job value="-2">
      <specialty>
        <value>E5B838C3AA304813B3EA4E28EE33702F</value>
        <name>Anesthesiologist</name>
      </specialty>
      <specialty>
        <value>36C9F22DC54347CEA39C142FE91E8B36</value>
        <name>A and E</name>
      </specialty>
      <specialty>
        <value>35E798C18DC04ECFB022DCF0E6DBEB51</value>
        <name>Cardiologist</name>
      </specialty>
      <specialty>
        <value>343B2555E45142E096546A3781680C02</value>
        <name>Dental Surgeon</name>
      </specialty>
      <specialty>
        <value>A5C669F6DB4D41DA8409960D6952023C</value>
        <name>Diabetologist/Endocrinologist</name>
      </specialty>
      <specialty>
        <value>2B01B4C29253459797CB596FE81C3AF4</value>
        <name>ENT</name>
      </specialty>
      <specialty>
        <value>6C761F3F81CB421BBD0746914031EF19</value>
        <name>General Medicine</name>
      </specialty>
      <specialty>
        <value>9DB49A58B8484E73AA24227DCDAD4C96</value>
        <name>Intensivist</name>
      </specialty>
      <specialty>
        <value>F80D023B174A421A82A140691BCD9E22</value>
        <name>Neurologist</name>
      </specialty>
      <specialty>
        <value>3F95529E15764EB1A55255DCEDDB6C4A</value>
        <name>Pediatrician</name>
      </specialty>
      <specialty>
        <value>9FC573D63A884C04A8675E86B43EABB9</value>
        <name>Psychiatrist</name>
      </specialty>
      <specialty>
        <value>7230D95FE4844A7785D25A73D5240BB9</value>
        <name>Respiratory</name>
      </specialty>
      <specialty>
        <value>E784A9F594BF468D85C51BBD5A9B0F5D</value>
        <name>Trainee</name>
      </specialty>
      <specialty>
        <value>431614E6148A4F639F912ED08803BD79</value>
        <name>Other Physician</name>
      </specialty>
    </specialty_job>
  </specialties>
</dropdowns>

什么阻止了第二次下拉填充？

1 个答案:

答案 0 :(得分：1)

问题是你的第一个DropDownList有一个选中的值，它不应该在你正在过滤的“job”表中。您应该将代码更改为：

private void Bind()
{
    int jobOrganizationId = 0;
    DataSet ds = new DataSet();
    ds.ReadXml(Server.MapPath("App_Data") + "\\XMLFile1.xml");
    DataRow[]  rows = ds.Tables["job_organization"].Select("name = '" + ddlOrg.SelectedItem.Text + "'");
    if(rows.Length > 0 && int.TryParse(rows[0]["job_organization_Id"].ToString(), out jobOrganizationId))
    {
        ddlJobTitle1.DataTextField = "name";
        ddlJobTitle1.DataValueField = "value";
        DataView view = new DataView(ds.Tables["job"]);
        view.RowFilter = "job_organization_Id='" + jobOrganizationId.ToString() + "'";
        ddlJobTitle1.Enabled = true;
        ddlJobTitle1.DataSource = view;
        ddlJobTitle1.DataBind();
    }
}

我建议在Visual Studio中使用DataSet Viewer。从xml生成数据集时非常方便。

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