• 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 == -1return
            //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- 3px; border-style: solid; border-color: Gray; padding: 3px;  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;  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=" 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<intstring> ExceptionalCollection
            {
                get
                {
                    if (HttpContext.Current.Session["ExceptionalCollection"] != null)
                    {
                        return (SortedList<intstring>)HttpContext.Current.Session["ExceptionalCollection"];
                    }
                    else
                    {
                        return new SortedList<intstring>();
                    }
                }
                set
                {
                    HttpContext.Current.Session["ExceptionalCollection"] = value;
                }
            }

    接下来,我们看看选择按钮的事件:

    View Code
      SortedList<intstring> ExceptionalCollection = new SortedList<intstring>();

        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<intstring> 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。

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  • 原文地址:https://www.cnblogs.com/insus/p/2682766.html
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