ASP.net中的AJAX:动态加载用户控件（Calendar控件为例）
时间：2010-08-30 来源：蔚蓝的大海
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这篇文章主要是一个动态加载用户控件的实例，页面效果是当用户点击按钮时，出现日历控件（用户自定义控件，包括每个月的1日出现“发工资”的提示），对日历进行操作时，不影响整个页面（无刷新），当用户再次点击按钮时，用户控件卸载。以前我的一个日历的实例中也实现了这个效果，但是那时使用的是整体用户控件加载，并且不卸载功能，当用户点击按钮时，出现的日历出现和消失都是采用Visible方法，这无疑加重了页面的负担，今天学习到了这种方法，记录下来，供日后回顾。 首先我们先来布置页面： 1.在网站下添加新项用户控件，默认其页面名：WebUserControl.ascx 2.在WebUserControl.ascx中添加一个日历控件，按照自己喜欢的样式改变其外观。 这里我想说明两个Calendar控件的属性，让我们一起来重温Calendar控件，首先Calendar控件默认可以选择日期，可以使用SelectionMode属性修改这个选择操作，这个属性的值可以是Day（允许在日历中单击某个日期）、DayWeek（允许在日历中单击某个日期，同时可以单击星期旁边的箭头，选择整个星期）、DayWeekMonth（可以选择日期或星期，日历右上角的箭头允许选择整个月）、none（用户不能做任何操作）。接着：day属性的一个有用的功能是，可以把Day属性的IsSelectable设置为false，关闭选择某个日期或日期范围的选项。这个功能在实际开发中，可能会用到，代码如下： if(e.Day.Date<DateTime.Now) e.Day.IsSelectable=false; 3.编写每个月1日时日历出现的“发工资”的提示，代码如下： 日历提示功能代码 代码 1using System; 2using System.Collections; 3using System.Configuration; 4using System.Data; 5using System.Linq; 6using System.Web; 7using System.Web.Security; 8using System.Web.UI; 9using System.Web.UI.HtmlControls; 10using System.Web.UI.WebControls; 11using System.Web.UI.WebControls.WebParts; 12using System.Xml.Linq; 13 14public partial class WebUserControl : System.Web.UI.UserControl 15{ 16 protected void Page_Load(object sender, EventArgs e) 17 { 18 19 } 20 //DayRender：日历中显示的每一天都会运行该方法。 21 protected void Calendar1_DayRender(object sender, DayRenderEventArgs e) 22 { 23 //单元格的垂直对齐方式为top 24 e.Cell.VerticalAlign = VerticalAlign.Top; 25 if (e.Day.DayNumberText == "1") 26 { 27 e.Cell.Controls.Add(new LiteralControl ("<p>发工资</p>")); 28 e.Cell.BorderColor = System.Drawing.Color.Black; 29 e.Cell.BorderWidth = 1; 30 e.Cell.BorderStyle = BorderStyle.Double; 31 e.Cell.BackColor = System.Drawing.Color.LightGray; 32 } 33 } 34}
4.新建一个AJAX窗口，命名为：DynamicLoadControl.aspx，在页面中放置一个Updatepanel1。 5.在Updatepanel1中放入一个Button1，text=“…”（18行）。 6. 在Updatepanel1中放入一个html的hidden控件，将其改为服务器控件，id改为：Dynamic_UserControl_Hidden1（17行）。 页面布局介绍，下面我们来看一下DynamicLoadControl.aspx的客户端代 代码 <head runat="server"><title>无标题页</title> <script type="text/javascript"> function pageLoad() { } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> <ContentTemplate> <input ID="Dynamic_UserControl_Hidden1" type="hidden" runat="server" /> <asp:Button ID="Button1" runat="server" Text="…" onclick="Button1_Click" /> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" /> </Triggers> </asp:UpdatePanel> </div> </form> </body> </html>
下面是cs代码， 动态加载用户控件代码 代码 1using System; 2using System.Collections; 3using System.Configuration; 4using System.Data; 5using System.Linq; 6using System.Web; 7using System.Web.Security; 8using System.Web.UI; 9using System.Web.UI.HtmlControls; 10using System.Web.UI.WebControls; 11using System.Web.UI.WebControls.WebParts; 12using System.Xml.Linq; 13 14public partial class DynamicLoadControl : System.Web.UI.Page 15{ 16 protected void Page_Load(object sender, EventArgs e) 17 { 18 19 } 20 //这个方法先于page_load之前执行，也在控件初始化前执行 21 protected void Page_Init(object sender, EventArgs e) 22 { 23 //从送来的参数中，判断用户控件是否已经加载，"Dynamic_UserControl_Hidden1"是个标志， 24 //为true时，代表用户控件存在，初次加载页面时，表示是false，故没有用户控件出现在网页上 25 if (Request.Params["Dynamic_UserControl_Hidden1"] == " true") 26 LoadDynamicUserControl(); 27 28 } 29 //点击按钮出现用户自定义控件 30 protected void Button1_Click(object sender, EventArgs e) 31 { 32 //当用户自定义控件（标志为true）存在时，就移除到自定义控件，同时标志改为false。 33 if (Request.Params["Dynamic_UserControl_Hidden1"] == "true") 34 { 35 UpdatePanel1.ContentTemplateContainer.Controls.Remove(UpdatePanel1.ContentTemplateContainer.FindControl("WebUserControl1")); 36 HtmlInputHidden hidden = (HtmlInputHidden)UpdatePanel1.ContentTemplateContainer.FindControl("Dynamic_UserControl_Hidden1"); 37 hidden.Value = "false"; 38 39 } 40 //否则就加载用户自定义控件 41 else 42 LoadDynamicUserControl(); 43 } 44 //加载用户自定义控件 45 private void LoadDynamicUserControl() 46 { 47 //当Updatepanel中没有用户控件时 48 if (UpdatePanel1.ContentTemplateContainer.FindControl("WebUserControl1") == null) 49 { 50 //根据指定的WebUserControl.ascx路径加载控件WebUserControl1 51 Control c = LoadControl("WebUserControl.ascx"); 52 c.ID = "WebUserControl1"; 53 //找到标志将其值改为true 54 HtmlInputHidden hidden =(HtmlInputHidden ) UpdatePanel1.ContentTemplateContainer.FindControl("Dynamic_UserControl_Hidden1"); 55 hidden.Value = "true"; 56 //在Updatepanel中加入用户控件 57 UpdatePanel1.ContentTemplateContainer.Controls.Add(c); 58 } 59 } 60 61} 高质量的.NET空间，完美支持1.0/2.0/3.5/MVC等 |
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