问题
How do I call a non-static method in server side(aspx.cs) from client side using javascript (aspx)....?
As far as I know I can call static method in server side from client side...
server side:
[WebMethod]
public static void method1()
{
}
client side:
<script language="JavaScript">
function keyUP()
{
PageMethods.method1();
}
</script>
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
</asp:ScriptManager>
It works. Now how do I call non-static method from client side?
回答1:
You can avoid the static constraint by using a simple .asmx page instead of the codebehind page.
1) Open New Website using the AJAX Enable ASP.NET template (it puts the necessary references in the web.config)
2) SIMPLESERVICE.ASMX - Add a new .asmx web service (I called mine SimpleService.asmx) Notice the [System.Web.Script.Services.ScriptSerive] decoration and that the SimpleService class implements Webservice.
<%@ WebService Language="C#" Class="SimpleService" %>
using System;
using System.Web.Services;
[System.Web.Script.Services.ScriptService]
public class SimpleService : WebService
{
[WebMethod]
public string GetMessage(string name)
{
return "Hello <strong>" + name + "</strong>, the time here is: " + DateTime.Now.ToShortTimeString();
}
}
3) DEFAULT.ASPX - To use it reference the service in you script manager and you are off and running. In my Javascript I call the class.method - SimpleService.GetMessage.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<script language="javascript" type="text/javascript">
function callServer() {
SimpleService.GetMessage($get("Name").value, displayMessageCallback);
}
function displayMessageCallback(result) {
$get("message").innerHTML = result;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" >
<Services>
<asp:ServiceReference Path="~/SimpleService.asmx" />
</Services>
</asp:ScriptManager>
<div>
</div>
<h1>Hello World Example</h1>
<div>
Enter Name: <input id="Name" type="text" />
<a href="javascript:callServer()">Call Server</a>
<div id="message"></div>
</div>
</form>
</body>
</html>
I used the example I found from Scott Gu Found Here.
回答2:
No you cannot call non-static methods from client side per se. I've tried it once but it is ugly one (also I used jQuery ajax). Just call the page using ajax with method name appended to it as query string parameter and then on server side check the parameter and call the relevant method. But as I've told you it is pretty ugly :(
$.ajax({'/mypage.aspx?m=mymethod',......}); //this is not correct syntax
on server side:
protected void Page_Load(object sender, EventArgs e)
{
if(!Request.QueryString.HasKeys() ||
string.IsNullOrEmpty(Request.QueryString["m"]))
{
//return error or something relevant to your code
}
var m = Request.QueryString["m"];
switch(m)
{
case "a":
a();
break;
.....
.....
}
}
回答3:
C#
public string LoadString() {
return "my string";
}
JS/jQuery
$('#txt').val(<%= LoadString() %>);
回答4:
Actually, you don't get to call non-static methods in this way.
When you are calling a PageMethod, you're basically calling a special web service. This feature only works with static methods on the same page.
回答5:
If you want to call it using the same function, you can use the following code:
[WebMethod]
public static void method1()
{
ClassOfNonStaticFunction obj = new ClassOfNonStaticFunction();
obj.yourFunctionName(ParametersIfAny);
}
回答6:
as an answer to Pramulia i think you want to have a function with an argument from the client side which is implemented in the example -> CallServer(arg1, arg2)
<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Implements Interface="System.Web.UI.ICallbackEventHandler" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html >
<head runat="server">
<title>Client Callbacks</title>
<script runat="server">
public void RaiseCallbackEvent(String eventArgument)
{
// Processes a callback event on the server using the event
// argument from the client.
}
public string GetCallbackResult()
{
// Returns the results of a callback event to the client.
string dateString = DateTime.Now.ToLongDateString();
return dateString;
}
void Page_Load(object sender, EventArgs e)
{
ClientScriptManager cm = Page.ClientScript;
String cbReference = cm.GetCallbackEventReference(this, "arg",
"ReceiveServerData", "");
String callbackScript = "function CallServer(arg, context) {" +
cbReference + "; }";
cm.RegisterClientScriptBlock(this.GetType(),
"CallServer", callbackScript, true);
}
</script>
<script type="text/javascript">
function ReceiveServerData(arg, context) {
Message.innerText = "Date from server: " + arg;
}
</script>
</head>
<body>
<h2>Client Callbacks Without Postbacks</h2>
<form id="form1" runat="server">
<input type="button" value="Callback"
onclick="CallServer('1', alert('Callback sent to Server'))" />
<br />
<span id="Message"></span>
</form>
</body>
</html>
回答7:
I ended up using hidden fields in case anyone reads this. I can set the value in c# under a function and then read it in javascript.
回答8:
Dave has written in detail about calling page methods from client side using jquery ajax. The general idea is like this (if you find any problem please refer to Dave's site).
C# Code:
[WebMethod]
public static string yourmethod(/*params*/)
{
return "Hello World!"
}
ASPX:
$.ajax({
type: 'POST',
data: /*Your Data*/,
dataType: 'JSON',
contentType: 'application/json',
url: '/yourpage.aspx/yourmethod',//Method to call
success: function(result, status) {
//handle return data
},
error: function(xhr, status, error) {
//handle error
}
});
来源：https://stackoverflow.com/questions/1360253/call-non-static-method-in-server-side-from-client-side-using-javsscript