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分享高手挑战---JS中如何判断ACTIVEX控件是否正确下载?
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?如何判断?
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mylittlejava 2002-03-05
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在IE4.0上有没有什么办法呢？
zosatapo 2002-02-27
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我的这个例子需要ie5.0以上版本支持的。
zosatapo 2002-02-27
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<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>
<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>
karma 2002-02-27
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do a check on a known method on the ActiveX control, if you got an error, then you know the control is not loaded properly, for example
<script language="javascript">
var bControlLoaded=false;
function window.onload()
{
try
{
if (objectID.someMethod)
bControlLoaded = true;
}
catch (ex){}
alert(bControlLoaded);
}
</script>
<object id="objectID"></object>
then in other places, before you make a method call, check if bControlLoaded is true. Or if the ActiveX control is a must for the page to proceed, redirect the user to some other page if the control is not loaded properly:
<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>
<script language="javascript">
var bControlLoaded=false;
function window.onload()
{
try
{
if (objectID.someMethod)
bControlLoaded = true;
}
catch (ex){}
alert(bControlLoaded);
}
</script>
<object id="objectID"></object>
then in other places, before you make a method call, check if bControlLoaded is true. Or if the ActiveX control is a must for the page to proceed, redirect the user to some other page if the control is not loaded properly:
<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>
