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When calling a Web service, you need to pay close attention to its expected input data type. When the input is of type integer, you may send an integer or a quoted integer. You send the input integer to the Web service by assigning the third parameter of the callService() method. The following call will be successful:
iCallID = webServiceCallerBody.echo.callService(handleResult, "echoInteger",
5);
As well as the following call:
iCallID = webServiceCallerBody.echo.callService(handleResult, "echoInteger", "5");
If you send a non-quoted string, the JavaScript interpreter will assume it is a variable and will complain that the variable is undefined. Therefore, the following line of code will yield an error:
iCallID = webServiceCallerBody.echo.callService(handleResult, "echoInteger", abc);
If you send a floating number, a quoted floating number, or a string, the response from the Web service will include an error. The following line of code:
iCallID = webServiceCallerBody.echo.callService(handleResult, "echoInteger", 5.6);
Will yield the following error:
Learn more about Web services in Column 96 (Web services, Part I: Introduction) and Column 97 (Web Services, Part II: Calling Service Methods).
Here is an HTML file that demonstrates calling a Web service. Copy it to your local disk, together with the WebService behavior (webservice.htc):
<HTML>
<BODY ID="webServiceCallerBody" onload="loadService()"
STYLE="behavior:url(webservice.htc);background-color:peachpuff;color:brown;font-size:18">
<SCRIPT LANGUAGE="JavaScript">
<!--
function loadService() {
webServiceCallerBody.onserviceavailable = enableServiceCall; //Used for the synchronous call.
webServiceCallerBody.useService(
"http://soap.bluestone.com:80/interop/EchoService/EchoService.wsdl","echo");
}
function callAsynch() {
iCallID = webServiceCallerBody.echo.callService(
handleResult, "echoInteger", 5);
}
function callSynch() {
var co = webServiceCallerBody.createCallOptions();
co.funcName = "echoInteger";
co.async = false;
var oResult = webServiceCallerBody.echo.callService(co, 5);
handleResult(oResult);
}
function enableServiceCall() {
b2.disabled = false;
}
function handleResult(res) {
if (!res.error) {
alert("Successful call. Result is " + res.value);
}
else {
alert("Unsuccessful call. Error is " + res.errorDetail.string);
}
}
// -->
</SCRIPT>
<HR><H4>Calls to an echo service</H4><HR><BR><BR>
<BUTTON ID="b1" onclick="callAsynch()">Call Asynchronously</BUTTON><BR><BR>
<BUTTON ID="b2" onclick="callSynch()" disabled>Call Synchronously</BUTTON><BR><BR><BR><BR>
<A HREF="http://www.xmethods.net/ilab/">Interop Testing Site</A>
</BODY>
</HTML>
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