从JavaScript调用全局类的C＃函数

Question

I have a global function that returns some string. I need to access to that function from JavaScript in one of the pages and set returned value to JavaScript variable.

Example:-

var jsvariable = <%GlobalClass.MethodReturningString();%>;

How to do that?

Answer 1

You cannot call C# function like this. you need to create a web service or webmethod in order to call this function. Please see this link it will help you. http://www.aspsnippets.com/Articles/Calling-ASPNet-WebMethod-using-jQuery-AJAX.aspx

Answer 2

Perform the following steps :

1. Right click on your website or web application and add a WebHandler. The extension for the webhandler is '.ashx'. Let's say you name your handler as 'Handler.ashx'
2. Open the Handler.ashx file and within the ProcessRequest method write the following : context.Response.Headers.Clear(); context.Response.Write(GlobalClass.MethodReturningString();); context.Response.Flush(); context.Response.Headers.Clear(); context.Response.Write(GlobalClass.MethodReturningString();); context.Response.Flush();

3. In your javascript, perform an ajax call using jQuery :

   $.ajax({ url:'someUrl/Handler.ashx', type:'GET', success : function(data){ var someJavascriptVariable = data; } });

NOTE: This is a quick and dirty write so I'm not guaranteeing that the code will surely work, but it's a point for you to start with.

Answer 3

May i thick You cannot do this but u can access ur c# function using ajax

For Example

   $.post('url', {parameter : parameter }, function (result) {

         // here the result is your function return value or output

   },"json");

URL FORMAT : '/pageurl/methodname'

Answer 4

First of all, as a clarification, it seems that you're not trying to actually call a C# method from Javascript, but rather render the return from a C# method inside the page so that it can be used as a Javascript variable value on the client side.

In order to do that you need to update you syntax like:

var jsvariable = '<%= GlobalClass.MethodReturningString() %>';

Please note that if your class is not in the same namespace as the inherited page from the code behind file, then you need to import its namespace like below:

<%@ Import Namespace="GlobalClassNamaspace" %>

The namespace import can also be done globally (and it will be automatically available in all of the site's pages), using the web.config file as described here .

If you were to actually need to call a C# method from Javascript, which would have been needed if you wanted to dynamically use its results from client side code, then that could be accomplished through Ajax .