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WebService component example

var oResult = window.event.result;

if (oResult.id == iCallID) {

if (oResult.error) {

alert(“An error occurred: “ + oResult.errorDetail.string);

} else {

alert(“Received back: “ + oResult.value);

}

};

iCallID = oService.FriendlyName.callService(...);

In this code, the

onresult

event handler first checks whether the result it’s handling is the response for

the appropriate request (in this way, a single

WebService

object can handle multiple requests). If the ID

of the result matches the call ID, the result is processed. The function ensures that there are no errors; if

an error occurs, the detailed error message is returned; otherwise the returned value is displayed.

Of course, it is up to you if you want to use the

value

property directly or use the

raw

property to parse

the returned SOAP code on your own.

WebService component example

This example uses the Temperature Service described in the sample WSDL earlier in the chapter. Because

the Microsoft

WebService

component requires you to know only the WSDL location and the name of the

operation you want to call, you don’t need the WSDL to get this working.

The Web page for this example consists of a text box (with the ID

“txtZip”

) and a button (labeled

“Get

Temperature”

). The user enters a zip code into the text box and then clicks the button to get the temper-

ature in that zip code (he calls the Web service). Of course, you also need an element to which you can

assign the

WebService

component. Here is the HTML:

<html>

<head>

<title>IE Web Service Example</title>

//...

</script>

</head>

<body>

<p><input type=”text” id=”txtZip” size=”10” /><input type=”button”

value=”Get Temperature” onclick=”callWebService()” />

<div id=”service” style=”behavior:url(webservice.htc)”

onresult=”onWebServiceResult()”></div>

</body>

</html>

The JavaScript to run this page is fairly simple:

var iCallID = null;

var sWSDL = “http://www.xmethods.net/sd/2001/TemperatureService.wsdl”;

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Web Services

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