子窗口选择多值返回至父窗口的文本框中

本次开发的专案中，有涉及至让步用户在子窗口选择一个或多个值之后，并返回至父窗口的文本框中。开发环境是Windows8 64bit + vs2012 + asp.net 4.5+ Ajax。下面是gif演示：

用户可以根据不同的品号选择，出现相对应的异常编号可供选择。这部分当然还有另外的功能，是用户首先是对品号对异常编号分配与绑定好。异常描述这个文本框，设为只读，也就是不让用户手动去更改。只能让用户选择来更改文本框的值。

品号的下拉框菜单，设好一个属性与一个事件 AutoPostBack="true" OnSelectedIndexChanged="DropDownListPinHao_SelectedIndexChanged"

DropDownListPinHao_SelectedIndexChanged  protected void DropDownListPinHao_SelectedIndexChanged(object sender, EventArgs e)
    {
        DropDownList DDL = (DropDownList)sender;
        //如果用户设有选择任何，return这个事件
        if (DDL.SelectedIndex == -1) return; 
        //以下是为子窗口的Repeater控件绑定数据。
        objExceptional.PinHaoId = ConvertData.ToSmallInt(DDL.SelectedItem.Value);
        this.RepeaterobjExceptionalList.DataSource = objExceptional.GetExceptionalByPinHaoPrimaryKey();
        this.RepeaterobjExceptionalList.DataBind();
    }

异常文本框，为了显示子窗口，使用了Ajax的 ajaxToolkit:ModalPopupExtender控件。详细Html代码如下，

View Code  <asp:TextBox ID="TextBoxExceptionalDescription" runat="server" CssClass="textbox"
                                        Width="99%" ReadOnly="true"></asp:TextBox>                                   
                                    <asp:Panel ID="pnlPopupWindown" runat="server" Style="display: none; background-color: #ffffdd; border-width: 3px; border-style: solid; border-color: Gray; padding: 3px; width: 500px;">
                                        <asp:Panel ID="Panel3" runat="server" Style="float: left; margin-bottom: 5px; cursor: move; background-color: #DDDDDD; border: solid 1px Gray; color: Black; height: 20px; width: 475px; text-align: center; line-height: 20px;">
                                            异常项目列表
                                        </asp:Panel>
                                        <asp:Panel ID="Panel4" runat="server" Style="float: right; margin-bottom: 5px; background-color: #DDDDDD; border: solid 1px Gray; color: Black; height: 20px; text-align: center; line-height: 20px;">
                                            <asp:LinkButton ID="btnClose" runat="server" Style="margin-right: 4px; margin-left: 4px;"
                                                OnClientClick="return false;" Text="×" ForeColor="Red" ToolTip="Close" />
                                        </asp:Panel>
                                        <div>
                                            <asp:Panel ID="Panel1" runat="server" ScrollBars="Vertical" Height="199px" Width="100%">
                                                <asp:Repeater ID="RepeaterobjExceptionalList" runat="server">
                                                    <HeaderTemplate>
                                                        <table border="1" cellpadding="1" cellspacing="0" width="96%">
                                                            <tr>
                                                                <td>&nbsp; </td>
                                                                <td>ID</td>
                                                                <td>Exceptional Name </td>
                                                            </tr>
                                                    </HeaderTemplate>
                                                    <ItemTemplate>
                                                        <tr id="tr1" runat="server" style="height: 10px; line-height: 10px;">
                                                            <td style="width: 8px;">
                                                                <asp:CheckBox ID="CheckBoxId" runat="server" onclick="Javascript:changeRowBgColor(this)" />
                                                            </td>
                                                            <td>
                                                                <asp:Label ID="Label_nbr" runat="server" Text='<%# Eval("Exceptional_nbr")%>'></asp:Label>
                                                            </td>
                                                            <td>
                                                                <asp:Label ID="label_Name" runat="server" Text=' <%# Eval("ExceptionalName")%>'></asp:Label>
                                                            </td>
                                                        </tr>
                                                    </ItemTemplate>
                                                    <FooterTemplate>
                                                        </table>
                                                    </FooterTemplate>
                                                </asp:Repeater>
                                            </asp:Panel>
                                            <div style="height: 3px;">
                                            </div>
                                            <asp:Panel ID="Panel2" runat="server">
                                                <asp:Button ID="btnSelected" runat="server" OnClick="btnSelected_Click" Text="选择"
                                                    CausesValidation="false" CssClass="button" />
                                            </asp:Panel>
                                        </div>
                                    </asp:Panel>
                                    <ajaxToolkit:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="TextBoxExceptionalDescription"
                                        PopupControlID="pnlPopupWindown" BackgroundCssClass="modalBackground" CancelControlID="btnClose"
                                        DropShadow="true" PopupDragHandleControlID="Panel3" />

还有一段Ajax的Javascript代码，需要帖至网页的结尾处。 如果同一网页中有多个子窗口，可以共用这段JavaScript 代码：

View Code   <script type="text/javascript">
                function setBodyHeightToContentHeight() {
                    document.body.style.height = Math.max(document.documentElement.scrollHeight, document.body.scrollHeight) + "px";
                }
                setBodyHeightToContentHeight();
                $addHandler(window, "resize", setBodyHeightToContentHeight);
            </script>

 为了保存用户选择的值，也就是说，用户没有真正保存入数据库，需要存储临时的选择值。因此你需要在程序中，宣告一个全局static属性，本例中Insus.NET是写在异常[Exceptional]类别中。

View Code  public static SortedList<int, string> ExceptionalCollection
        {
            get
            {
                if (HttpContext.Current.Session["ExceptionalCollection"] != null)
                {
                    return (SortedList<int, string>)HttpContext.Current.Session["ExceptionalCollection"];
                }
                else
                {
                    return new SortedList<int, string>();
                }
            }
            set
            {
                HttpContext.Current.Session["ExceptionalCollection"] = value;
            }
        }

接下来，我们看看选择按钮的事件：

View Code   SortedList<int, string> ExceptionalCollection = new SortedList<int, string>();

    protected void btnSelected_Click(object sender, EventArgs e)
    {
        //循环Repeater控件
        foreach (RepeaterItem item in this.RepeaterobjExceptionalList.Items)
        {
           //只对Item和AlternatingItem数据行进行处理
            if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
            {
               //判断相关的控件是否为空，避免当控件为空，产生异常规性异常。
                if (item.FindControl("tr1") != null && item.FindControl("CheckBoxId") != null && item.FindControl("Label_nbr") != null && item.FindControl("label_Name") != null)
                {
                    //找出相关的控件
                    HtmlTableRow htr = (HtmlTableRow)item.FindControl("tr1");
                    var cb = item.FindControl("CheckBoxId") as CheckBox;
                    var lblnbr = item.FindControl("Label_nbr") as Label;
                    var lblname = item.FindControl("label_Name") as Label;

                    //获取相关控件的值
                    short nbr = Convert.ToInt16(lblnbr.Text);
                    string name = lblname.Text;

                    //如果用户选择了和集合中没有包含有对应的值，更改背景颜色和选择的值存入集合中。
                    if (cb.Checked && !ExceptionalCollection.ContainsKey(nbr))
                    {
                        htr.Attributes.CssStyle.Add("background-color", "#ffdab9");
                        ExceptionalCollection.Add(nbr, name);
                    }
                    //如果用户没作选择和集合中包含有对应的值，更改背景颜色默认颜色和从集合移除相对应的值。
                    if (!cb.Checked && ExceptionalCollection.ContainsKey(nbr))
                    {
                        htr.Attributes.CssStyle.Add("background-color", "");
                        ExceptionalCollection.Remove(nbr);
                    }

                   //最后是更新静态属性。
                    Exceptional.ExceptionalCollection = ExceptionalCollection;
                }
            }
        }

        string ed_Value = string.Empty;

        //循环集合
        foreach (KeyValuePair<int, string> kvp in ExceptionalCollection)
        {
            ed_Value += "; " + kvp.Value;
        }

        //如果集合有值，截除开始的两个字符"; "。
        if (ed_Value.Length > 0)
            ed_Value = ed_Value.Substring(2);

        //把值赋给文本框。
        this.TextBoxExceptionalDescription.Text = ed_Value;
    }

本例只作为备忘，因此Insus.NET只供重点部分代码，直接帖至专案中，有可能不能直接运行。如果任何问题与意见，可以留言。