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Please use our Code Center to obtain source-code and example projects/solutions:
http://codecenter.softwaretoolbox.com
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  Web Based Applications using the OPC Web Client Web Servicev
Quick Links within this page
Objective
To display the value of a Tag wihin the Browser. This value will be read from the OPC Server by means of the OPC Web Client Web Service, which utilizes the power of XML.
Writing to a single Tag
 JAVASCRIPT
<html>
<head>
<title>OPC Web Client running in IE, using OPC Web Client WEB SERVICE</title>
<SCRIPT LANGUAGE="JScript" src="ArgumentFormat.js"></SCRIPT>
<script language="javascript">
function fnInit()
{
provider.init();
}
function fnWriteResult()
{
if(event.error)
{
alert('error' + event.errorMessage);
}
else
{
alert('Write success!');
}
}
function btnWrite_click()
{
provider.write({ServerClass: "OPCLabs.KitServer.2", ItemID:
"Simulation.Register_I4", Value: document.all.tagvalue.value});
}
</script>
</head>
<body onload="fnInit();">
<DIV id="service" style="behavior:url(webservice.htc)"></DIV>
<DIV id="provider" style="behavior:url(eagateway.htc)" webService="service"
onWriteResult="fnWriteResult()"></DIV>
<p>OPC Server: OPCLabs.Kitserver.2<br>
<b>Tag Value:</b>
<input type="text" name="tagvalue" value="" size="10">
<input type="button" name="b1" value="write" onClick="btnWrite_click();">
</p>
</body>
</html>
Writing to Multiple Tags within a single transaction:
VBScript
Due to the limitations of VBScript and an easy way to pass-in complex arrays, the ability to read multiple tags in a single transaction is not currently available, but will be in the near future.
JavaScript
<html>
<head>
<title>OPC Web Client running in IE, using OPC Web Client WEB SERVICE</title>
<SCRIPT LANGUAGE="JScript" src="ArgumentFormat.js"></SCRIPT>
<script language="javascript">
function fnInit()
{
provider.init();
}
function fnWriteResult()
{
if(event.error)
{
alert('error' + event.errorMessage);
}
else
{
alert('Write success!');
}
}
function btnWriteMultiple_click()
{
provider.writeMultiple(
new Array(
{ServerClass: "OPCLabs.Kitserver.2", ItemID: "Simulation.Register_I4", Value: document.all.tag1value.value},
{ServerClass: "OPCLabs.Kitserver.2", ItemID: "Simulation.Register_R8", Value: document.all.tag2value.value},
{ServerClass: "OPCLabs.Kitserver.2", ItemID: "Simulation.Register_BSTR", Value: document.all.tag3value.value}
),
new Array(
"tag1",
"tag2",
"tag3"
)
);
}
</script>
</head>
<body onload="fnInit();">
<DIV id="service" style="behavior:url(webservice.htc)"></DIV>
<DIV id="provider" style="behavior:url(eagateway.htc)" webService="service" onWriteResult="fnWriteResult()"></DIV>
<p>OPC Server: OPCLabs.Kitserver.2<br>
<b>Tag Values:</b>
<br>Simlator.Register_I4: <input type="text" name="tag1value" value="" size="10">
<br>Simlator.Register_R8: <input type="text" name="tag2value" value="" size="10">
<br>Simlator.Register_BSTR: <input type="text" name="tag3value" value="" size="10">
<input type="button" name="b1" value="write" onClick="btnWriteMultiple_click();">
</p>
</body>
</html>
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