0
点赞
收藏
分享

微信扫一扫

asp.net 2.0 ajax中实现弹出窗口报警提示

_铁马冰河_ 2022-12-05 阅读 68


  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,下面小结之
(原文:​​​http://aspalliance.com/1306_How_to_Show_MessengerLike_Popups_Using_AJAX​​​)

  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

[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]

2 在default.aspx中,首先加入一个updateprogress控件,如下

<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" οnclick="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

<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
之后是写script了

<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,

  

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

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>

举报

相关推荐

0 条评论