Explain the Auto Postback feature?

When ever the "AutoPostback" property of a control is set to "True", by default it is set to "False", the .NET Framework will insert couple of extra lines for the control when the HTML is rendered, the lines added are as follows:
  • In the control where the Auto Postback propery has been set to True, a java script method will be added as "_doPostBack" which will take two arguments as "EventTarget" and the other as "EventArgument". The event target will be holding the name of the control and the event argument will be holding any additional data that needs to be passed.
  • Two hidden variables would be added to the page, the first one would be "_EVENTTARGET" which holds the name of the control which has triggered the event and "_EVENTARGUMENT" which holds additional information needed by the server.
  •  An "onchange" method is added to the control which actually makes a call to the method "_doPostBack".

Comments

Post a Comment

Popular posts from this blog

jQuery Basics

jQuery Introduction The files needed to run a jQuery function can be downloaded from the URL mentioned below: http://jquery.com/download/ There are actually two versions of the file that is available, the first one id the minified and compressed version, jquery-1.10.1.min.js , which is basically used for the production environment and the other is the full version, uncompressed and readable, which is used for the development environment. If somebody does not want to download the file, they can use it from the CDN (Content Delivery Network) provided both by Google and Microsoft, the details are here under: Google - http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js Microsoft - http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.10.1.min.js Note:  If you look at the Google URL above - the version of jQuery is specified in the URL (1.10.1). If you would like to use the latest version of jQuery, you can either remove a number from the end of the version st...
Read more

What is the difference between a Page Layout and Master Page in SharePoint?

A Page Layout is nothing but a template which when used in conjuncture with the Master Page gives the look and feel and contents of the page. Each page layout has an associated content type that determines the kind of content that can be stored on pages based on that page layout. Master Pages and Page Layouts dictate the overall look and feel of your SharePoint site. Master Pages contain controls that are shared across multiple page layouts, such as navigation, search, or language-preference for multilingual sites. Page layouts contain field controls and Web Parts. All page layouts reference a master page that is based on the CustomMasterUrl property of the SPWeb class. The top-level SharePoint Server site for a site collection hosted on SharePoint Server 2010 has a special document library called the Master Page and Page Layout Gallery. All Page Layouts and Master Pages are stored in this document library. Reference: http://blog.beckybertram.com/Lists/Posts/Post...
Read more

Accessing data from SharePoint 2010 to an ASP.NET application

Image
In order to access the SharePoint lists and document libraries data from a native ASP.NET application we need to make use of the web services that have been provided. The full list of the web services available from within SharePoint 2010 can be found here http://www.etechplanet.com/blog/sharepoint-web-services-7c-list-of-all-web-services-available-with-wss-30moss-2007.aspx The steps to access the web service are as follows: Create a native ASP.NET web application Add a reference of the web service Create an object of the web site Pass on to the web service object the credentials using which the access will be authorized Retrieve the results using the appropriate method
Read more