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?http://www.xvna.com" 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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