call a function of code-behind (.vb or .cs) file in JavaScript

Following code shows how you can use a function of a code-behind file in JavaScript (.js) file. In this example, you will see that when a loged-in user closes his browser Window (instead of loging-out), how you can log him out programatically by accessing the FunctionToLogOut() function of .vb file in a JavaScript file.  


contents of “MyScript.js” (JavaScript) file_


function myunload()

{

 if (window.event.clientX < 0 && window.event.clientY < 0)

 {

   alert("You are about to log out...");

   PageMethods.FunctionToLogOut();

 }

}


***************************************************************************************

In the <body> tag of your web page_


<body onunload="myunload()">


***************************************************************************************

In the code behind_


<WebMethod()>_

Public Shared Function FunctionToLogOut()


[ Yor code for Loging-Out user will go here... ]


End Function


***************************************************************************************

In the <form> tag of web page_


<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="True" EnablePageMethods="True">

  <Scripts>

        <asp:ScriptReference Path="MyScript.js"/>

  </Scripts>

 </asp:ScriptManager>

 

Comments

Post a Comment

Popular posts from this blog

GROUP BY, CUBE, ROLLUP and SQL SERVER 2005

Image
  I learn about CUBE and ROLLUP function today and I found it really usefull for generating reports. Let me give you one example where we can use ROLLUP and CUBE. Lets say you are developing the E-Commerce application and administrator wants the report which shows products purchased by all user group by product and buyer. You will say that’s really easy and can write the query as shown below, 1: SELECT CustomerName,CustomerName,SUM(Quantity*PricePerItem) 2: FROM Orders GROUP BY CustomerName,CustomerName Fig – (1) Group By clause.      Which will returns the result as shown below, Fig – (2) Result of GROUP BY clause     However what if you want result as display below, Fig – (3) Desire result        Here ROLLUP and CUBE comes into the picture and help us. The above result is generated using ROLLUP.  ROLLUP adds new row for each column used in GROUP BY clause. First have a look ...
Read more

How to get content of Ckeditor & Fckeditor using Javascript

CKEDITOR: To get content of ckeditor we will create object of ckeditor and then we will provide id of textarea that is replaced by ckeditor. Syntax: CKEDITOR.instances.textarea_id.getData();getData(); Where CKEDITOR.instances   :  gives all the instances of CKEDITOR; textarea_id   : it is ID of textarea that is containing data ; getData()       : return content of Ckeditor current instance. FCKEDITOR: To get content of Fckeditor we will create Instance of Fckeditor for textarea and then we will get data using GetHTML method. Syntax : FCKeditorAPI.GetInstance('textarea_id'). GetHTML(); Where textarea_id     :  it is ID of textarea that is containing data ; GetHTML()             :  This function returns content of textarea with id textarea_id.  
Read more

How to Fix Error- Sys.WebForms.PageRequestManagerTimeoutException - The server request timed out

To solve this problem we can increase the timeout. You can change the timeout time by adding a new property to the script manager control. This property is called AsyncPostBackTimeOut and it can help us to define the number of seconds before the request will throw a request timeout exception*. For example if you want that the timeout will take maximum 10 minutes your code should be look like this: < asp : ScriptManager ID ="ScriptManager1" runat ="server" AsyncPostBackTimeOut ="600" > </ asp : ScriptManager >       * The default value of the AsyncPostBackTimeOut property is 90 seconds.
Read more