.Net与JavaScript联合打造动态进度条实现

1.创建进度条：

<DIV id="Lay1" style="Z-INDEX: 1; LEFT: 1%; VISIBILITY: hidden; WIDTH: 99%; CURSOR: crosshair; POSITION: absolute; TOP: 32px; HEIGHT: 95%; BACKGROUND-COLOR: #ffffff"><FONT face="宋体"></FONT><FONT face="宋体"></FONT><FONT face="宋体"></FONT><FONT face="宋体"></FONT><br>
<b><font color="#800080" size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;& nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;正在同步数据，请稍候...</font></b>
<table align="center">
<tr>
<td>
<div style="BORDER-RIGHT: black 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: black 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 8pt; PADDING-BOTTOM: 2px; BORDER-LEFT: black 1px solid; PADDING-TOP: 2px; BORDER-BOTTOM: black 1px solid"><span id="progress1">&nbsp;</span>
<span id="progress2">&nbsp;</span> <span id="progress3">&nbsp;</span> <span id="progress4">
&nbsp;</span> <span id="progress5">&nbsp;</span> <span id="progress6">&nbsp;</span>
<span id="progress7">&nbsp;</span> <span id="progress8">&nbsp;</span> <span id="progress9">
&nbsp;</span> <span id="progress10">&nbsp;</span> <span id="progress11">&nbsp;</span>
<span id="progress12">&nbsp;</span> <span id="progress13">&nbsp;</span><span id="progress14">&nbsp;</span><span id="progress15">&nbsp;</span>
</div>
</td>
</tr>
</table>
<script language="javascript">
var pr = 15; // set to number of progress <span>'s.
var progressColor = 'blue'; // set to progress bar color
var progressInterval = 300; // set to time between updates (milli-seconds)

var prog = pr;
var progressTimer;
function progress_clear() {
for (var i = 1; i <= pr; i++) document.getElementById('progress'+i).style.backgroundColor = 'transparent';
prog = 0;
}
function progress_update() {
prog++;

if (prog > pr) progress_clear();
else document.getElementById('progress'+prog).style.backgroundColor = progressColor;
progressTimer = setTimeout('progress_update()',progressInterval);
}
function progress_stop() {
clearTimeout(progressTimer);
progress_clear();
}
//progress_update(); // start progress bar
</script>
</DIV> 

2.设置查询按钮属性

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'在此处放置初始化页的用户代码
If Not IsPostBack The
but_find.Attributes.Add("onClick", "Lay1.style.visibility='';progress_update();")
End If
End Sub 

3.注册javascript脚本

Public Sub scriptjdt(ByVal objPage As System.Web.UI.Page, ByVal strValue As String)
Dim jb As String
jb = "<script language='JavaScript'>" + strValue + "</script>"
objPage.RegisterStartupScript("jdt_ok", jb)
End Sub 

4.在查询按钮单击事件中调用