ASP.NET编程之实现弹窗报警提示的前言,在web应用中,比如OA中,经常要用到一些提示,比如EMAIL到达了,就做个象MSN那样的提示框,弹出给用户提示,然后再关闭。在asp.net 2.0的ajax中,这个现在不难做到了,刚好看到老外的一篇文章,讲解到,下面小结
比如有个数据库表,是存放EMAIL的,当数据库表中的EMAIL一有的时候,就提示用户,首先简单写一个WEBSERVICE如下
以下为引用的内容:
- [ScriptService]
- public class InboxService : System.Web.Services.WebService
- {
- [WebMethod]
- public int GetLatestNumberOfEmails()
- {
- int numberOfEmails = 0;
- using (SqlConnection conn = new SqlConnection(WebConfigurationManager.ConnectionStrings[0].ConnectionString))
- {
- using (SqlCommand cmd = new SqlCommand("GetLatestNumberOfEmails", conn))
- {
- cmd.CommandType = CommandType.StoredProcedure;
- conn.Open();
- numberOfEmails = (int)cmd.ExecuteScalar();
- }
- }
- return numberOfEmails;
- }
- }
这里要注意要在客户端通过AJAX调用WEBSERICE,要加上[ScriptService]
ASP.NET编程之实现弹窗报警提示在default.aspx中,首先加入一个updateprogress控件,如下
以下为引用的内容:
- ﹤asp:UpdateProgress DynamicLayout="False" ID="UpdateProgress1" runat="server"﹥
- ﹤ProgressTemplate﹥
- ﹤div id="modal" class="modal"﹥
- ﹤div class="modalTop"﹥
- ﹤div class="modalTitle"﹥My Inbox﹤/div﹥
- ﹤span style="CURSOR: hand" onclick="javascript:HidePopup();"﹥
- ﹤img alt="Hide Popup" src="App_Themes/Default/images/close_vista.gif" border="0" /﹥
- ﹤/span﹥
- ﹤/div﹥
- ﹤div class="modalBody"﹥
- You received ﹤strong﹥﹤span id="modalBody"﹥﹤/span﹥﹤/strong﹥ Email(s).
- ﹤/div﹥
- ﹤/div﹥
- ﹤/ProgressTemplate﹥
- ﹤/asp:UpdateProgress﹥
这里的关闭X按钮,调用javascript的脚本,等阵再说
然后当然要加scriptmanager控件了,如下
以下为引用的内容:
- ﹤asp:ScriptManager ID="ScriptManager1" runat="server"﹥
- ﹤Services﹥
- ﹤asp:ServiceReference Path="~/InboxService.asmx" /﹥
- ﹤/Services﹥
- ﹤/asp:ScriptManager﹥
这里调用了我们刚才写的webservice
ASP.NET编程之实现弹窗报警提示:Script
以下为引用的内容:
- ﹤script type="text/javascript"﹥
- var numberOfEmails_original= 0;
- var app = Sys.Application;
- app.add_init(applicationInitHandler);
- function applicationInitHandler(sender, args) {
- InboxService.GetLatestNumberOfEmails(OnCurrentNumberOfEmailsReady);
- }
首先,默认的当然是0封邮件了,有变量来存放当前邮件数量,之后是在ajax中的初始化事件中调用webserice的方法了,并且回调OnCurrentNumberOfEmailsReady方法,
以下为引用的内容:
- function OnCurrentNumberOfEmailsReady(result, userContext, methodName) {
- numberOfEmails_original= result;
- // Start Checking
- StartChecking();
- }
- OnCurrentNumberOfEmailsReady方法将WEBSERVICE调用的结果(当前状态下有多少封信RESULT)返回给变量,然后调用sartchecking()方法
- function StartChecking() {
- InboxService.GetLatestNumberOfEmails(OnLastestNumberOfEmailsReady);
- }
- startchecking方法,继续回调OnLastestNumberOfEmailsReady方法
- function OnLastestNumberOfEmailsReady(result, userContext, methodName) {
- var numberOfEmails_new= result;
- if (numberOfEmails_new ﹥ numberOfEmails_original) {
- ShowPopup();
- $get("modalBody").innerHTML= numberOfEmails_new - numberOfEmails_original;
- // Update the count here
- numberOfEmails_original= numberOfEmails_new;
- }
- // Start checking again
- window.setTimeout(StartChecking, 10000);
- }
这个方法,用当前邮件数-原来邮件数,就得出新增了多少封邮件了,再将结果赋值给显示区域的modalbody,并且记得把当前邮件数量的,变量更新哦(numberOfEmails_original= numberOfEmails_new;)
然后再用setimeout来设置每隔10000毫秒检查一次了
以下为引用的内容:
- function ShowPopup() {
- $get("UpdateProgress1").style.visibility= "visible";
- $get("UpdateProgress1").style.display= "block";
- }
- function HidePopup() {
- $get("UpdateProgress1").style.visibility= "hidden";
- $get("UpdateProgress1").style.display= "none";
- }
- ﹤/script﹥
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