java script 调用c_在client端通过java script调用Web Service

朱雀 2022-11-06 08:59 182阅读 0赞

Using this method causes the WebService behavior to invoke a remote method call on a Web Service.

When the callService method invokes asynchronous communication between the WebService behavior and the Web Service by setting the property to true, the return value of the method is an Integer that identifies the instance of the method call. In this case, an event handler or callback function should be used to process the returned results.

When the callService method invokes synchronous communication between the WebService behavior and the Web Service by setting the async property to false, the return value of the method is a result object.

For an example of using both synchronous and asynchronous communication between the WebService behavior and the Web Service, see the examples on the object page.

If oCallHandler is not specified, then an onresult event handler is used to examine the results of the callService. Using this approach, the properties of the object can be examined to determine if the call was made successfully.

If oCallHandler is specified, then a callback handler function is used to process the results of the method call. The result object is passed to the first parameter of the callback function, so the user specifies the name of the object in the script code. Code samples using each approach are given in .

Regardless of the type of function used to process the results, the properties exposed to script are similar. If an event handler is used, the syntax used to access result information is event.result. If the callback approach is used, the object name is the name of the first parameter in the callback function declaration. For a comprehensive list of property objects returned by a WebService behavior call, see .When passing an XmlElement

![217787.html][] object to a web service using oParam, the Extensible Markup Language (XML) contained in the XmlElement must contain a single root node. The root node is not returned by the object. In the following XML data island, BOOKLIST is the root.

Show Example

`16-041`

HTML

1998-03-07

127853

Instant HTML

`16-048`

Scripting

1998-04-21

375298

Instant JavaScript

The following example shows a call to a web service. The element where the WebService Behavior is attached has an id of aaa and the friendly name for the web service is tst.var x = myXMLElement.documentElement;      //get the xmlelement object

aaa.tst.callService(myCallBackFunction,"XmlEcho",x);

This callback function returns the first child of the booklist element by asking for the zero element child. There is no way to ask for the root or booklist element as it has no parent element.function myCallBackFunction(res) \{

if (!res.error) \{

var x = res.value;

var y = x.selectNodes("BOOKLIST")\[0\].xml;

alert(y);

\}else\{

alert(res.errorDetail.string);

[217787.html]: /images/20221023/b4313b54d1d042bfbbc86a3710e9e6c5.png