当我的数据表加载到我的服务器上时，我试图显示加载 gif。 我从 here 找到了一些代码，但是当我尝试实现它时，我收到运行时错误“Show”未定义。下面是我正在使用的 javascript/jquery 代码
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
function ShowProgress() {
setTimeout(function () {
var modal = $('<div />');
modal.addClass("modal");
$('body').append(modal);
var loading = $(".loading");
loading.show();
var top = Math.max($(window).height() / 2 - loading[0].offsetHeight / 2, 0);
var left = Math.max($(window).width() / 2 - loading[0].offsetWidth / 2, 0);
loading.css({ top: top, left: left });
}, 200);
}
$('form').live("submit", function () {
ShowProgress();
});
我的div id正在加载，所以当它遇到javascript中的loading.show()时，就会出错。
<div class="loading" align="center">
Loading. Please wait.<br />
<br />
<img src="gears.gif" alt="" />
</div>
我正在页面加载事件上注册我的脚本，例如:
If IsPostBack = False Then
Dim script As String = "$(document).ready(function () { $('[id*=Button2]').click(); });"
ClientScript.RegisterStartupScript(Me.GetType, "load", script, True)
End If
编辑: 我正在编辑它以添加 Css 标记。
<style type="text/css">
.modal
{
position: fixed;
top: 0;
left: 0;
background-color: black;
z-index: 99;
opacity: 0.8;
filter: alpha(opacity=80);
-moz-opacity: 0.8;
min-height: 100%;
width: 100%;
}
.loading
{
font-family: Arial;
font-size: 10pt;
border: 5px solid #67CFF5;
width: 200px;
height: 100px;
display: none;
position: fixed;
background-color: White;
z-index: 999;
}
如有任何帮助，我们将不胜感激。
最佳答案
您引用的示例正在使用 Bootstrap。您需要在代码中引用 bootstrap javascript 库才能使用 .show() 方法。
这是示例源代码的最上面部分 - 请参阅底行:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="ctl00_Head1"><meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta http-equiv="Content-type" content="text/html;charset=UTF-8" /><title>
Display Loading progress Image when Page loads or does PostBack using ASP.Net
</title><meta http-equiv="Keywords" content="Mudassar,Mudassar Khan, Mudassar Ahmed Khan,asp.net articles,C#.NET Articles,ASP,ASP.NET,C#,VB,CSharp,C Sharp,dotnet,GridView,DropDownList,Visual Studio,AJAX,CSS, CSS3, JavaScript,JQuery,XML,Crystal Reports,SSIS,SSRS,DetailsView,winforms,windows forms,windows application,code samples,.net code examples,WCF tutorial,WebService tutorial,LINQ,,authoring,programming,learning,beginners guide,primer,lessons,school,howto,reference,free,examples,samples,source code,demos,tips,links,FAQ,tag list,forms,Crystal Reports,Reporting,RDLC Reports,ReportViewer,FaceBook,Twiiter,Google, Google Maps" /><meta http-equiv="Description" content="
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<!--[if gt IE 8]>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css" media="screen" />
<![endif]-->
<!--[if !IE]><!-->
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css" media="screen" />
<!--<![endif]-->
<!--[if lt IE 9]>
<link rel="stylesheet" href="/Demos/Bootstrap-3.0/css/bootstrap.min.css" media="screen" />
<![endif]-->
<link rel="stylesheet" href="//www.aspsnippets.com/Demos/Bootstrap-3.0/css/override.css?15_12_2016" /><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.0.3/css/font-awesome.css" media="screen" />
<!--[if !IE]><!-->
<link rel="stylesheet" href="//www.aspsnippets.com/Demos/Bootstrap-3.0/media/Above_1024.css?06_05_2014" /><link rel="stylesheet" media="all and (max-width: 767px)" href="//aspsnippets.com/Demos/Bootstrap-3.0/media/below_767.css" />
<!--<![endif]-->
<!--[if gt IE 8]>
<link rel="stylesheet" href="//aspsnippets.com/Demos/Bootstrap-3.0/media/Above_1024.css?06_05_2014" /><link rel="stylesheet" media="all and (max-width: 767px)" href="//aspsnippets.com/Demos/Bootstrap-3.0/media/below_767.css" />
<![endif]-->
<!--[if lt IE 9]>
<link rel="stylesheet" href="//aspsnippets.com/Demos/Bootstrap-3.0/css/IE.css?06_05_2014" />
<![endif]-->
<script type="text/javascript" src='//ajax.aspnetcdn.com/ajax/jQuery/jquery-1.8.3.min.js'></script>
<script type="text/javascript" src='//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/js/bootstrap.min.js'></script>
关于JavaScript 运行时错误 'Show' 未定义，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44729120/