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Web Services in Mozilla

function callWebService() {

var sZip = document.getElementById(“txtZip”).value;

var oService = document.getElementById(“service”);

oService.useService(sWSDL, “Temperature”);

iCallID = oService.Temperature.callService(“getTemp”, sZip);

}

function onWebServiceResult() {

var oResult = event.result;

if (oResult.id == iCallID) {

var oDiv = document.getElementById(“divResult”);

if (oResult.error) {

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

} else {

alert(“It is currently “ + oResult.value

+ “ degrees in that zip code.”);

}

The first function,

callWebService()

, gets the zip code from the text box and calls the Web service. It

first loads the WSDL file with the friendly name

Temperature

. The next line uses the

callService()

method, passing in the operation name and the zip code.

The other function,

onWebServiceResult()

, displays the result of the call. This function uses the same

basic algorithm as the example earlier to check whether the result ID is equal to the call ID. It then reports

either an error or the returned value.

Web Services in Mozilla

Beginning in Mozilla 1.0, Web developers have had access to Web services. Mozilla currently supports

two ways of handling Web services: using a low-level SOAP API or using WSDL proxy objects (intro-

duced in Mozilla 1.4). Before exploring the WSDL-based functionality, it’s important to understand the

basic SOAP API.

Windows XP Service Pack 2 has some significant effects on the WebService compo-

nent. First, you must specify that files ending with .htc are served with a mime type

text/x-component

(this must be done on the server). Second, the WebService

component is forbidden access to external Web sites, meaning that you can only

access Web services hosted on the same server as the page attempting to call them.

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