[英]Call WebService from Java script
我有簡單的網絡服務:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
namespace fmNVBwebSrv
{
/// <summary>
/// Summary description for fm
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
[System.Web.Script.Services.ScriptService]
public class fm : System.Web.Services.WebService
{
[WebMethod]
public string HelloWorld(string callerName)
{
return "Hello World";
}
}
}
我正在嘗試從 javaScript 調用它:
<head runat="server">
<title>Web Service call from client-side JavaScript</title>
<script language="javascript" type="text/javascript">
function SendRequest()
{
fm.HelloWorld(form1.MyTextBox.value, OnComplete, OnError,
OnTimeOut);
}
function OnComplete(arg)
{
alert(arg);
}
function OnTimeOut(arg)
{
alert("timeOut has occured");
}
function OnError(arg)
{
alert("error has occured: " + arg._message);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
<Services>
<asp:ServiceReference Path="http://localhost:55661/fm.asmx" />
</Services>
</asp:ScriptManager>
<div>
<input type="text" value="" id="MyTextBox" />
<input type="button" value="Send Request to the Web Service"
id="RequestButton" onclick="return SendRequest()" />
</div>
</form>
</body>
我在控制台出現錯誤Uncaught ReferenceError: fm is not defined
。 我是 Java Script 新手。 那里缺少什么?
我有同樣的問題並解決了。 調用方法時,需要添加名稱空間:
function SendRequest()
{
fmNVBwebSrv.fm.HelloWorld(form1.MyTextBox.value, OnComplete, OnError,
OnTimeOut);
}
希望這會有所幫助!
您不能像這樣直接從JavaScript調用fm
,因為JavaScript對您的Web服務一無所知,因此您必須告訴JavaScript該怎么做。 檢查此Microsoft頁面以獲取演練 。 嘗試這個:
<head runat="server">
<title>Web Service call from client-side JavaScript</title>
<script language="javascript" type="text/javascript">
var helloWorldProxy;
// Initializes global and proxy default variables.
function pageLoad()
{
// Instantiate the service proxy.
helloWorldProxy = new fmNVBwebSrv.fm();
// Set the default call back functions.
helloWorldProxy.set_defaultSucceededCallback(SucceededCallback);
helloWorldProxy.set_defaultFailedCallback(FailedCallback);
}
// Processes the button click and calls
// the service Greetings method.
function SendRequest()
{
var HelloWorld = helloWorldProxy.HelloWorld();
}
// Callback function that
// processes the service return value.
function SucceededCallback(result)
{
var RsltElem = document.getElementById("Results");
RsltElem.innerHTML = result;
}
// Callback function invoked when a call to
// the service methods fails.
function FailedCallback(error, userContext, methodName)
{
if(error !== null)
{
var RsltElem = document.getElementById("Results");
RsltElem.innerHTML = "An error occurred: " +
error.get_message();
}
}
if (typeof(Sys) !== "undefined") Sys.Application.notifyScriptLoaded();
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
<Services>
<asp:ServiceReference Path="http://localhost:55661/fm.asmx" />
</Services>
</asp:ScriptManager>
<div>
<input type="text" value="" id="MyTextBox" />
<input type="button" value="Send Request to the Web Service"
id="RequestButton" onclick="SendRequest()" />
</div>
</form>
<script language="javascript" type="text/javascript">
pageLoad();
</script>
</body>
在上面的這段代碼中,我在aspx頁面中包含了JavaScript,並在最后調用了pageLoad()
函數。 我這樣做只是為了保持您在問題中的處理方式。 但是,最好遵循MSDN示例,方法是將JavaScript文件保存到HelloWorld.js
文件中,然后在aspx文件中引用它,如下所示:
<asp:ScriptManager runat="server" ID="scriptManager">
<Services>
<asp:ServiceReference path="~/fm.asmx" />
</Services>
<Scripts>
<asp:ScriptReference Path="~/HelloWorld.js" />
</Scripts>
</asp:ScriptManager>
勾選 web.config 中的 key,設置 mode = "none"。 這解決了我的問題。
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