ASP.NET DEMO 16: 通过GridView布局实现的多行批量更新
2008-05-22 02:17 晓风残月 阅读(2852) 评论(0) 编辑 收藏 举报
特点：
- 一次可批量提交多行数据
- 客户端由CheckBox实现切换浏览/编辑状态，不需要回发
- 服务器端实现维护编辑状态视图
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <%-- http://topic.csdn.net/u/20080521/15/a2da7051-4c1b-490d-ab28-1f01323aba47.html?seed=1952824859 --%> <script runat="server"> void ShowProductData(GridView grid) { DataTable dt = CreateSampleData(); grid.DataSource = dt; grid.DataBind(); } #region sample data static DataTable CreateSampleEmptyDataTable() { DataTable tbl = new DataTable("Student"); tbl.Columns.Add("StudentNO", typeof(string)); tbl.Columns.Add("FirstName", typeof(string)); tbl.Columns.Add("LastName", typeof(string)); tbl.Columns.Add("Age", typeof(int)); tbl.Columns.Add("Gender", typeof(string)); return tbl; } static DataTable CreateSampleData() { DataTable tbl = CreateSampleEmptyDataTable(); tbl.Rows.Add("20021342", "Jack", "Wu", 25, "M"); tbl.Rows.Add("20025341", "Jue", "You", 23, "F"); tbl.Rows.Add("20022254", "Viky", "Huang", 24, "F"); tbl.Rows.Add("20022231", "Leo", "Wong", 24, "M"); return tbl; } #endregion protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { ShowProductData(GridView1); } } protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) { DataRowView drv = e.Row.DataItem as DataRowView; // 同步ddlGender 选中项 if (drv != null) { DropDownList ddlGender = e.Row.FindControl("ddlGender") as DropDownList; if (ddlGender != null) { ddlGender.SelectedValue = (string)drv["Gender"]; } } } protected void GridView1_PreRender(object sender, EventArgs e) { // 维护客户端状态 bool b; string m = "", n = "none"; foreach (GridViewRow row in GridView1.Rows) { CheckBox chk = row.FindControl("chkEdit") as CheckBox; //if (chk != null) //{ b = chk.Checked; // 以下代码未进行null 检查，确保存在对应ID的控件。 // 建立健壮性的程序，应进行非空引用检查。 // (row.FindControl("lblFirstName") as WebControl).Style[HtmlTextWriterStyle.Display] = b ? n : m; (row.FindControl("txtFirstName") as WebControl).Style[HtmlTextWriterStyle.Display] = b ? m : n; // (row.FindControl("lblLastName") as WebControl).Style[HtmlTextWriterStyle.Display] = b ? n : m; (row.FindControl("txtLastName") as WebControl).Style[HtmlTextWriterStyle.Display] = b ? m : n; // (row.FindControl("lblAge") as WebControl).Style[HtmlTextWriterStyle.Display] = b ? n : m; (row.FindControl("txtAge") as WebControl).Style[HtmlTextWriterStyle.Display] = b ? m : n; // (row.FindControl("lblGender") as WebControl).Style[HtmlTextWriterStyle.Display] = b ? n : m; (row.FindControl("ddlGender") as WebControl).Style[HtmlTextWriterStyle.Display] = b ? m : n; //} } } protected void btnUpdate_Click(object sender, EventArgs e) { bool updated = false; foreach (GridViewRow row in GridView1.Rows) { CheckBox chk = row.FindControl("chkEdit") as CheckBox; if (chk != null && chk.Checked) { // 以下代码未进行null 检查，确保存在对应ID的控件 // 建立健壮性的程序，应进行非空引用检查。 string newFirstName = (row.FindControl("txtFirstName") as TextBox).Text.Trim(); string newLastName = (row.FindControl("txtLastName") as TextBox).Text.Trim(); int newAge = int.Parse((row.FindControl("txtAge") as TextBox).Text.Trim()); string newGender = (row.FindControl("ddlGender") as DropDownList).SelectedValue; //******************************************************************************************/ // 这里执行真正的数据库更新操作 // .... Response.Write("<script>alert('请在[btnUpdate_Click(object sender, EventArgs e)]中实现自己的数据库更新代码')<" + "/script>"); // .... //******************************************************************************************/ updated = true; } } //// 假如有数据更新，从数据库加载新数据刷新页面 //// 当然如果很在乎性能，可以直接从TextBox 的值copy 到Label，但实现起来费时。 //if (updated) //{ // ShowProductData(); //} } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>ASP.NET DEMO16_GridViewBatchEdit</title> <script type="text/javascript"> var $ = function(id) { return document.getElementById(id); } function chkEdit_Click(sender, args) { //debugger; // 切换可编辑状态 var b = sender.checked; var m = "", n = "none"; // $(args.containerClientID + "_" + "lblFirstName").style.display = b ? n : m; $(args.containerClientID + "_" + "txtFirstName").style.display = b ? m : n;; // $(args.containerClientID + "_" + "lblLastName").style.display = b ? n : m; $(args.containerClientID + "_" + "txtLastName").style.display = b ? m : n;; // $(args.containerClientID + "_" + "lblAge").style.display = b ? n : m; $(args.containerClientID + "_" + "txtAge").style.display = b ? m : n;; // $(args.containerClientID + "_" + "lblAge").style.display = b ? n : m; $(args.containerClientID + "_" + "txtAge").style.display = b ? m : n;; // $(args.containerClientID + "_" + "lblGender").style.display = b ? n : m; $(args.containerClientID + "_" + "ddlGender").style.display = b ? m : n;; } function shouldUpdate() { var grd = $('<% =GridView1.ClientID %>'); var inputs = grd.getElementsByTagName('input'); for(var i = 0; i < inputs.length; i++) { if(inputs[i].type == "checkbox" && inputs[i].id.indexOf("chkEdit") > 0 && inputs[i].checked) { return true; } } return false; } </script> </head> <body> <form id="form1" runat="server"> <div> <h3>通过GridView布局实现的批量更新</h3> <em>请在[btnUpdate_Click(object sender, EventArgs e)]中实现自己的数据库更新代码</em> <br /> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnRowDataBound="GridView1_RowDataBound" OnPreRender="GridView1_PreRender"> <Columns> <asp:TemplateField HeaderText="Edit?"> <ItemTemplate> <asp:CheckBox id="chkEdit" onclick='<%# String.Format(@"chkEdit_Click(this, {{containerClientID:""{0}""}})", (Container as Control).ClientID) %>' ToolTip="Enable Edit?" runat="server" /> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="StudentNO"> <ItemTemplate> <%# (Container.DataItem as DataRowView)["StudentNO"]%> <!-- 避免反射，可提升性能--> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="FirstName"> <ItemTemplate> <asp:Label ID="lblFirstName" runat="server" Text='<%# (Container.DataItem as DataRowView)["FirstName"] %>' /> <asp:Textbox ID="txtFirstName" runat="server" Text='<%# ((Container as Control).FindControl("lblFirstName") as Label).Text %>' style="display:none;" /> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="LastName"> <ItemTemplate> <asp:Label ID="lblLastName" runat="server" Text='<%# Eval("LastName") %>' /> <asp:Textbox ID="txtLastName" runat="server" Text='<%# ((Container as Control).FindControl("lblLastName") as Label).Text %>' style="display:none;" /> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Age"> <ItemTemplate> <asp:Label ID="lblAge" runat="server" Text='<%# Eval("Age") %>' /> <asp:Textbox ID="txtAge" runat="server" Text='<%# ((Container as Control).FindControl("lblAge") as Label).Text %>' style="display:none;" /> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Gender"> <ItemTemplate> <asp:Label ID="lblGender" runat="server" Text='<%# Eval("Gender").ToString() == "M" ? "Male" : "Female" %>' /> <asp:DropDownList ID="ddlGender" runat="server" style="display:none"> <asp:ListItem Value="M" Text="Male"/> <asp:ListItem Value="F" Text="Female"/> </asp:DropDownList> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> <input id="Button2" type="button" value="Reload" onclick="location.href=location.href;" /> <asp:Button ID="btnUpdate" runat="server" Text="Update" OnClick="btnUpdate_Click" OnClientClick="if(!shouldUpdate()) return !!alert('没有可更新数据！');" /> </div> </form> </body> </html>
其他可用方案
一次编辑 GridView 的所有行 （孟老大）
