.NET ------ 实现点击下拉框选择一类后出现复选框

如：求职中有 人力资源类，IT 类等，IT 类又有 .NET 开发，Java开发，运维等

实现：下拉框展示总体类别，复选框展示选中类别中的详细

主要方式：选中下拉框内容时出发复选框控件，将属于某一类的全部查出

一、页面数据展示

 1、展示页面主要引用下拉框空间和复选框控件，包括图片控件用于全选，反选以及置空操作

<tr><td align="right">求职内容：</td><td align="left">
            <table cellpadding="0" cellspacing="0" border="0" width="100%">
            <tr>
            <td><asp:DropDownList ID="ddlJobUser_job_JobContent_Name1_4132"  AutoPostBack="True" OnSelectedIndexChanged="ddlJobUser_job_JobContent_Name_4132Select" runat="server"></asp:DropDownList></td>
            <td align="right">
　　　　　　　　　　<asp:ImageButton ID="btnsel1" runat="server" ImageUrl="~/qdAdmin/qdimages/xsel.png" Width="12" Height="12" onclick="btnsel1_Click" title="全选" /> 
　　　　　　　　　　<asp:ImageButton ID="btnnx1" runat="server" ImageUrl="~/qdAdmin/qdimages/xselx.png" Width="12" Height="12" onclick="btnnx1_Click"  title="反选" /> 
　　　　　　　　　　<asp:ImageButton ID="btnselnot1" runat="server" ImageUrl="~/qdAdmin/qdimages/xselnot.png" Width="12" Height="12" onclick="btnselnot1_Click"  title="全空" /></td>
            </tr>
            <tr><td colspan="2" align="left"><asp:CheckBoxList ID="cblJobUser_job_JobContent_Name1_4132" RepeatColumns="2" runat="server" style="word-break: keep-all;white-space:nowrap;"></asp:CheckBoxList></td></tr>    
            </table>
    </td>
</tr>

2、可以后台控制下拉框长度等样式，尽量能封装的就封装，增强代码的可复用性，方便下次使用

//调用基本页面中的 SetDropDownListStyleLineBlack 方法用于控制下拉框长度
base.SetDropDownListStyleLineBlack(ddlJobUser_job_JobContent_Name1_4132, 100);

//主要实现
    public void SetDropDownListStyleLineBlack(DropDownList ddl, int iWidth)
    {
        string slabel = string.Empty;
        StringBuilder sb = new StringBuilder();

        sb.Append("border-bottom- 1px;");
        sb.Append("border-bottom-style: solid;");
        sb.Append("border-bottom-color: #D4D0C8;");
        sb.Append("text-align: center;");
        //sb.Append("font-size: 12px;");
        //sb.Append("font-weight: bold;");
        //sb.Append("color: #FF0000;");
        sb.Append("border-top- 0px;");
        sb.Append("border-right- 0px;");
        sb.Append("border-left- 0px;");
        sb.Append("border-top-style: none;");
        sb.Append("border-right-style: none;");
        sb.Append("border-left-style: none;");
        if (iWidth > 0)
            sb.Append("" + iWidth + "px;");

        ddl.Attributes.Add("style", sb.ToString());
    }

3、属性解释以及后台方法：

3.1、下拉框

ID="ddlJobUser_job_JobContent_Name1_4132" 用于给下拉框赋值

在数据库设计的时候要注意这种右级别关系的数据一般使用 code 分级,考虑的多点使用9位为一组，如 000000001 为一级，000000001000000001为二级，其中000000001 是 000000001000000001 的父级，000000001000000001是000000001的第一个儿子。

设计时也可以加了 lever 进行标识第几级，这样查找时更方便点，空间和时间自己把握

        //获取数据库中的值
        List<ITEM.Model.qdCnt4.FourCollsType> mList11 = _bllTypeColls.Get_Ex_FourCollsTypeListByIDLevel("TypeCollGuid,TypeCollName,TypeCollCode", base.EnterpriseGuid, 4132, 1, 0f);
        {
            //赋值
            this.ddlJobUser_job_JobContent_Name1_4132.DataTextField = "TypeCollName";
            this.ddlJobUser_job_JobContent_Name1_4132.DataValueField = "TypeCollCode";
            this.ddlJobUser_job_JobContent_Name1_4132.DataSource = mList11;
            this.ddlJobUser_job_JobContent_Name1_4132.DataBind();
            //默认选中的为空
            this.ddlJobUser_job_JobContent_Name1_4132.Items.Insert(0, new ListItem());
            //执行选择的事件
            ddlJobUser_job_JobContent_Name_4132Select(new object(), new EventArgs());
        }

 AutoPostBack="True"  和  OnSelectedIndexChanged="ddlJobUser_job_JobContent_Name_4132Select"  用于点击下拉框时同时触发后台中的ddlJobUser_job_JobContent_Name_4132Select 方法

3.2、复选框

ID="cblJobUser_job_JobContent_Name1_4132" 用于给复选框赋值

RepeatColumns="2"   控制复选框展示的内容， 一行展示两个

    protected void ddlJobUser_job_JobContent_Name_4132Select(object sender, EventArgs e)
    {
        //获取下拉框中选中的值
        string Scode = this.ddlJobUser_job_JobContent_Name1_4132.SelectedValue;
        if (Scode != "")
        {
            //根据选中的值查表
            List<ITEM.Model.qdCnt4.FourCollsType> mList = _bllTypeColls.Get_Ex_FourCollsTypeList_CodeDown("TypeCollCode,TypeCollName", base.EnterpriseGuid, 4132, Scode, 0f);
            //给复选框赋值
            this.cblJobUser_job_JobContent_Name1_4132.DataTextField = "TypeCollName";
            this.cblJobUser_job_JobContent_Name1_4132.DataValueField = "TypeCollCode";
            this.cblJobUser_job_JobContent_Name1_4132.DataSource = mList;
            this.cblJobUser_job_JobContent_Name1_4132.DataBind();
        }
        else
        {
            this.cblJobUser_job_JobContent_Name1_4132.Items.Clear();
        }
    }

3.3、图片事件，控制复选框是否选中

ID="btnsel1"   //  用于标识该图片事件

ImageUrl="~/qdAdmin/qdimages/xsel.png" //  用于给该图片事件选个图片

Width="12" Height="12" // 用于指定大小

onclick="btnsel1_Click" // 用于点击图片调用 btnsel1_Click方法

title="全选"  //由于鼠标放在图片上给个提示

控制全选

  protected void btnsel1_Click(object sender, ImageClickEventArgs e)
    {
        ImageButton btn = (ImageButton)sender;
        if (btn.ID == "btnsel1")
        {
            for (int i = 0; i <= this.cblJobUser_job_JobContent_Name1_4132.Items.Count - 1; i++)
            {
                //将复选框代表的值全都选中
                this.cblJobUser_job_JobContent_Name1_4132.Items[i].Selected = true;
            }
        }
      
    }

控制置空

    protected void btnselnot1_Click(object sender, ImageClickEventArgs e)
    {
        ImageButton btn = (ImageButton)sender;
        if (btn.ID == "btnselnot1")
        {
            for (int i = 0; i <= this.cblJobUser_job_JobContent_Name1_4132.Items.Count - 1; i++)
            {
                //将复选框代表的值全都置空
                this.cblJobUser_job_JobContent_Name1_4132.Items[i].Selected = false;
            }
        }
    }

控制反选

 protected void btnnx1_Click(object sender, ImageClickEventArgs e)
    {
        ImageButton btn = (ImageButton)sender;
        if (btn.ID == "btnnx1")
        {
            for (int i = 0; i <= this.cblJobUser_job_JobContent_Name1_4132.Items.Count - 1; i++)
            {
                //将复选框代表的值，选中的变成未选中
                this.cblJobUser_job_JobContent_Name1_4132.Items[i].Selected = !this.cblJobUser_job_JobContent_Name1_4132.Items[i].Selected;
            }
        }
    }

二、存储与展示

1、在数据库中使用 code 和 name 进行存储，可以存取多组如下，因此写入数据库和展示时要注意将不同类别之间分开

code 表示层级，如下：000000039 表示下拉框中的 IT，000000039000000003就表示具体的职业Java开发工程师，使用 |  分隔为两组

000000039000000003,000000039000000010|,000000032000000001,000000032000000004

 设计时要注意其长度，我这边就省事点了，

2、多组存储

     #region 求职内容
        {
            _job_userinfo.JobUser_job_JobContent_4132_Code = "";// mUserInfo.JobUser_job_JobContent_Code_4132 + strGuid;//求职内容，多选，以逗号分隔
            _job_userinfo.JobUser_job_JobContent_4132_Name = "";// mUserInfo.JobUser_job_JobContent_Name_4132 + strText;//求职内容，多选，以逗号分隔


            if (this.cblJobUser_job_JobContent_Name_4132.SelectedValue != "")
            {
                string strGuid = "";
                string strText = "";
                foreach (ListItem item in cblJobUser_job_JobContent_Name_4132.Items)
                {
                    if (item.Selected == true)
                    {
                        string sign = strGuid == string.Empty ? "" : ",";
                        strGuid += sign + item.Value;
                        strText += sign + item.Text;

                    }
                }
                _job_userinfo.JobUser_job_JobContent_4132_Code = strGuid;//求职内容，多选，以逗号分隔
                _job_userinfo.JobUser_job_JobContent_4132_Name = strText;//求职内容，多选，以逗号分隔
            }

            if (this.cblJobUser_job_JobContent_Name2_4132.SelectedValue != "")
            {
                string strGuid = "";
                string strText = "";
                foreach (ListItem item in cblJobUser_job_JobContent_Name2_4132.Items)
                {
                    if (item.Selected == true)
                    {
                        string sign = strGuid == string.Empty ? "" : ",";
                        strGuid += sign + item.Value;
                        strText += sign + item.Text;

                    }
                }
                strGuid = _job_userinfo.JobUser_job_JobContent_4132_Code == string.Empty ? strGuid : "|," + strGuid;
                strText = _job_userinfo.JobUser_job_JobContent_4132_Code == string.Empty ? strText : "," + strText;
                _job_userinfo.JobUser_job_JobContent_4132_Code = _job_userinfo.JobUser_job_JobContent_4132_Code + strGuid;//求职内容，多选，以逗号分隔
                _job_userinfo.JobUser_job_JobContent_4132_Name = _job_userinfo.JobUser_job_JobContent_4132_Name + strText;//求职内容，多选，以逗号分隔
            }

            if (this.cblJobUser_job_JobContent_Name3_4132.SelectedValue != "")
            {
                string strGuid = "";
                string strText = "";
                foreach (ListItem item in cblJobUser_job_JobContent_Name3_4132.Items)
                {
                    if (item.Selected == true)
                    {
                        string sign = strGuid == string.Empty ? "" : ",";
                        strGuid += sign + item.Value;
                        strText += sign + item.Text;

                    }
                }
                strGuid = _job_userinfo.JobUser_job_JobContent_4132_Code == string.Empty ? strGuid : "|," + strGuid;
                strText = _job_userinfo.JobUser_job_JobContent_4132_Code == string.Empty ? strText : "," + strText;
                _job_userinfo.JobUser_job_JobContent_4132_Code = _job_userinfo.JobUser_job_JobContent_4132_Code + strGuid;//求职内容，多选，以逗号分隔
                _job_userinfo.JobUser_job_JobContent_4132_Name = _job_userinfo.JobUser_job_JobContent_4132_Name + strText;//求职内容，多选，以逗号分隔
            }
        }
        #endregion

3、显示

         #region 求职内容
            if (job_userinfo.JobUser_job_JobContent_4132_Code.Length > 0)
            {
                #region 对原始数据处理
                string strGuid = job_userinfo.JobUser_job_JobContent_4132_Code;// ,1,2,3,|,1,2,3|,1,2,3,5,|
                strGuid = "^" + strGuid;
                strGuid = strGuid.Replace("^,", "").Replace("^", "").Replace(",|", "|").Replace("|,", "|");
                strGuid = strGuid + "%";
                strGuid = strGuid.Replace("|%", "").Replace("%", "");
                string strName = job_userinfo.JobUser_job_JobContent_4132_Name;
                strName = ("^" + strName).Replace("^,", "").Replace("^", "");
                #endregion

                //this.LabJobUser_job_JobContent_Name_4132Select.Text = strName;
                strs = strGuid.Split('|');
                if (strs.Length > 0)
                {
                    string[] strs1 = strs[0].Split(',');
                    if (strs1[0].Length >= 9)
                    {
                        List<ITEM.Model.qdCnt4.FourCollsType> modelList = _bllTypeColls.Get_Ex_FourCollsTypeListByIDLevel("*", base.EnterpriseGuid, 4132, 1, " and typecollcode = '" + strs1[0].Substring(0, 9) + "'", 0f);
                        this.ddlJobUser_job_JobContent_Name_4132.SelectedValue = strs1[0].Substring(0, 9).ToLower();
                        ddlJobUser_job_JobContent_Name_4132Select(new object(), new EventArgs());
                        for (int i = 0; i < strs1.Length; i++)
                        {
                            foreach (ListItem it in this.cblJobUser_job_JobContent_Name_4132.Items)
                            {
                                if (it.Value == strs1[i] && strs1[i] != "")
                                {
                                    it.Selected = true;
                                }
                            }
                        }
                    }
                }
                if (strs.Length > 1)
                {
                    string[] strs1 = strs[1].Split(',');
                    if (strs1[0].Length >= 9)
                    {
                        List<ITEM.Model.qdCnt4.FourCollsType> modelList = _bllTypeColls.Get_Ex_FourCollsTypeListByIDLevel("*", base.EnterpriseGuid, 4132, 1, " and typecollcode = '" + strs1[0].Substring(0, 9) + "'", 0f);
                        this.ddlJobUser_job_JobContent_Name2_4132.SelectedValue = strs1[0].Substring(0, 9).ToLower();
                        ddlJobUser_job_JobContent_Name2_4132Select(new object(), new EventArgs());
                        for (int i = 0; i < strs1.Length; i++)
                        {
                            foreach (ListItem it in this.cblJobUser_job_JobContent_Name2_4132.Items)
                            {
                                if (it.Value == strs1[i] && strs1[i] != "")
                                {
                                    it.Selected = true;
                                }
                            }
                        }
                    }
                }
                if (strs.Length > 2)
                {
                    string[] strs1 = strs[2].Split(',');
                    if (strs1[0].Length >= 9)
                    {
                        List<ITEM.Model.qdCnt4.FourCollsType> modelList = _bllTypeColls.Get_Ex_FourCollsTypeListByIDLevel("*", base.EnterpriseGuid, 4132, 1, " and typecollcode = '" + strs1[0].Substring(0, 9) + "'", 0f);
                        this.ddlJobUser_job_JobContent_Name3_4132.SelectedValue = strs1[0].Substring(0, 9).ToLower();
                        ddlJobUser_job_JobContent_Name3_4132Select(new object(), new EventArgs());
                        for (int i = 0; i < strs1.Length; i++)
                        {
                            foreach (ListItem it in this.cblJobUser_job_JobContent_Name3_4132.Items)
                            {
                                if (it.Value == strs1[i] && strs1[i] != "")
                                {
                                    it.Selected = true;
                                }
                            }
                        }
                    }
                }

            }
            #endregion