如何判断ACTIVEX控件是否下载 - 好素材

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如何判断ACTIVEX控件是否下载

好素材网 www.HaoSc.com 02月22日 11:49

[查看演示] 源码如下
----------------------------------------------------------
<html>

<head>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>如何判断ACTIVEX控件是否下载－www.51windows.Net</title>
<style>

</style>
</head>

<body>


　　大家可以看到在下载ACTIVEX控件时IE通常会弹出一个对话框问是否容许下载并执行该ACTIVEX控件,如果用户点否则控件无法下载,那我后面JS对控件方法的调用肯定会出错,如何避免这个问题呢?是否可以在调用方法之前用JS判断一下呢?请看我下面的讲解?
 
方法一: 
  你可以试着调用ActiveX control里的一个方法Method, 如调用不成功,则说明control还没有下载成功.例如: 
<script language="javascript"> 
var bControlLoaded=false; 
function window.onload() 
{ 
try 
{ 
if (objectID.someMethod) 
bControlLoaded = true; 
} 
catch (ex) 
{} 
alert(bControlLoaded); 
} 
</script> 
<object id="objectID"></object>
 
　
　　换句话说,在你调用方法这前,检查bControlLoaded是否返回真.若不是，则报警，也可以转到用户定义的网页显示control没有下载成功． 
<script language="javascript"> 
function window.onload() 
{ 
try 
{ 
if (objectID.someMethod) 
bControlLoaded = true; 
} 
catch (ex) 
{ 
alert("you did not install the control properly!"); 
window.location.href="someotherpage.html"; 
} 
} 
</script>
 
　
方法二: 
<html XMLNS:CC> 
<head> 
<STYLE> 
@media all { CC\:clientCaps {behavior:url(#default#clientCaps)}} 
</Style> 
<title>Client Capabilities</title> 
</head> 
<body onload="showComponentStatus();" bgcolor="#FFFFFF"> 
<CC:clientCaps id=clientCaps /> 
</body>
 
　
<script language=javascript> 
function showComponentStatus(){ 
displayComponent("Address Book", 
"{7790769C-0471-11D2-AF11-00C04FA35D02}"); 
displayComponent("DirectAnimation", 
 
　
"{283807B5-2C60-11D0-A31D-00AA00B92C03}"); 
displayComponent("DirectAnimation Java Classes", 
 
　
"{4F216970-C90C-11D1-B5C7-0000F8051515}"); 
displayComponent("DirectShow", "{44BBA848-CC51-11CF-AAFA-00AA00B6015C}"); 
displayComponent("Dynamic HTML Data Binding", 
 
　
"{9381D8F2-0288-11D0-9501-00AA00B911A5}"); 
displayComponent("Dynamic HTML Data Binding for Java", 
 
　
"{4F216970-C90C-11D1-B5C7-0000F8051515}"); 
displayComponent("Internet Connection Wizard", 
 
　
"{5A8D6EE0-3E18-11D0-821E-444553540000}"); 
displayComponent("Internet Explorer 5 Web Browser", 
 
　
"{89820200-ECBD-11CF-8B85-00AA005B4383}"); 
displayComponent("Internet Explorer Classes for Java", 
 
　
"{08B0E5C0-4FCB-11CF-AAA5-00401C608555}"); 
displayComponent("Internet Explorer Help", 
 
　
"{45EA75A0-A269-11D1-B5BF-0000F8051515}"); 
displayComponent("Internet Explorer Help Engine", 
 
　
"{DE5AED00-A4BF-11D1-9948-00C04F98BBC9}"); 
displayComponent("Windows Media Player", 
 
　
"{22D6F312-B0F6-11D0-94AB-0080C74C7E95}"); 
displayComponent("NetMeeting NT", 
 
　
"{44BBA842-CC51-11CF-AAFA-00AA00B6015B}"); 
displayComponent("Offline Browsing Pack", 
 
　
"{3AF36230-A269-11D1-B5BF-0000F8051515}"); 
displayComponent("Outlook Express", 
 
　
"{44BBA840-CC51-11CF-AAFA-00AA00B6015C}"); 
displayComponent("Task Scheduler", 
 
　
"{CC2A9BA0-3BDD-11D0-821E-444553540000}"); 
displayComponent("Microsoft virtual machine", 
 
　
"{08B0E5C0-4FCB-11CF-AAA5-00401C608500}"); 
displayComponent("VRML 2.0 Viewer", 
 
　
"{90A7533D-88FE-11D0-9DBE-0000C0411FC3}"); 
displayComponent("Wallet", 
"{1CDEE860-E95B-11CF-B1B0-00AA00BBAD66}"); 
}
 
　
function displayComponent(compDesc, compID){ 
if (clientCaps.isComponentInstalled(compID, "componentID")){ 
alert("Installed."); 
} 
} 
</script> 
</html>

</body>

</html>

<div style="position: absolute; top: 10; right: 10; width: 148; height: 18;cursor:hand">
<input type="button" name="Button" value="查看源代码" onClick= 'window.location = "view-source:" + window.location.href'></div>

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