The dojoConfig object (formerly djConfig) allows you to set options and default behavior for various aspects of the toolkit. In this tutorial we'll explore what's.

A chapter on UpdatePanel control in the complete ASP.NET AJAX tutorial using Visual Studio Express 2012. ASP.NET AJAX is a free framework for building a new generation of richer, more interactive, highly personalized cross-browser web applications.

Uploading Files with AJAX - Treehouse Blog. The introduction of AJAX marked a huge leap forward in the history of the web. The ability to communicate with a web server without reloading the page has revolutionised how web applications are built. The primary technology that enables AJAX (XMLHttp.

Requests) has evolved significantly since the initial conception of dynamic websites. A nice feature added to XMLHttp. Requests in recent years is the ability to handle file uploads. Traditionally many developers have resorted to using technologies like Flash to upload files to a server. The problem with this approach is that the user needs to have a third- party browser plugin installed.

In this post you’ll learn how to upload files to a server using native Java. Script technologies.

The example we’re going to use supports uploading multiple files in a single request. However, you can apply the same principles to single- file uploads too. Lets get started!

Selecting Files to Upload. The first thing you need to do is set up your HTML form that will allow the user to select the file(s) that they wish to upload. To keep things simple lets use a standard < input> element with the file type.< form id=.

This will allow the user to select multiple files from the file picker launched by the browser. If you don’t specify this attribute the user can only select one file. Now that you’ve got your HTML form set up lets take a look at the Java. Script code that will handle the file upload. Uploading Files to the Server. First of all you need to create three variables that hold references to the < form> , < input> , and < button> elements in your HTML markup. Element. By. Id('file- form').

Select = document. Element. By. Id('file- select'). Button = document. Element. By. Id('upload- button'); Next you need to attach an event listener to the form’s onsubmit event. This will prevent the browser from submitting the form, allowing us to handle the file upload using AJAX instead. Next you update the inner.

HTML property on the upload. Button to Uploading.. This just provides a bit of feedback to the user so they know the files are uploading. Your next job is to retrieve the File. List from the < input> element and store this in a variable. You can do this by accessing the files property.// Get the selected files from the input. This is used to construct the key/value pairs which form the data payload for the AJAX request.// Create a new Form.

Data object. You’ll also want to check that the user has selected the type of file you’re expecting.// Loop through each of the selected files. The file’s type property will return the file type as a string. Pumpkin Patch Baby Clothes Malaysia Online more. You can therefore use the Java.

Script match() method to ensure that this string matches the desired type. If the file type does not match, you skip the file by calling continue. You then use the append method on the form.

Data object to add this file to the data payload. The Form. Data. append() method is used to handle Files, Blobs, or Strings.// Files. Data. append(name, file, filename). Data. append(name, blob, filename). Data. append(name, value); The first parameter specifies the name of the data entry. This will form the key in the data payload. The second parameter specifies either a File, Blob, or String that will be used as the value for the data entry.

When appending a File or Blob you can also specify a filename, but this isn’t required. Next you need to set up the XMLHttp. Request that is responsible for communicating with the server.

To do this you first need to create a new XMLHttp. Request object.// Set up the request. You do this using the open method.

This method takes three parameters. The HTTP method, the url that will handle the request, and a boolean value that determines whether the request should be dealt with asynchronously.// Open the connection. Examining the status property of the xhr object will tell you if the request completed successfully.// Set up a handler for when the request finishes. Pass the form. Data object to the send method which is available on the xhr object.// Send the Data.

Your server- side code will need to extract the files from the request and process them as desired. Browser Support. Browser support for the technologies used in this post is generally good. Internet Explorer being the only exception. You will be okay with IE 1. IE didn’t include support for some of the XMLHttp. Request features covered in this post.

IEFirefox. Chrome. Safari. Opera. 10. Summary. In this post you’ve learned how to upload files to a web server using native Java.

Script technologies. The advancement in functionality of XMLHttp. Requests has eliminated the need for developers to use third- party browser plugins to handle file uploads. This is good as native browser features are often faster and more secure than those provided by a plugin.

How do you plan to use AJAX file uploads in your projects? Share your thoughts in the comments below.

Update. Panel control - The complete ASP. NET Ajax Tutorial. The Update. Panel control is probably the most important control in the ASP.

NET AJAX package. It will AJAX'ify controls contained within it, allowing partial rendering of the area. We already used it in the Hello world example, and in this chapter, we will go in depth with more aspects of the control.

The Content. Template tag is required, since it holds the content of the panel. Multi Hack Premium Elite Vip. The content can be anything that you would normally put on your page, from literal text to web controls. The following example will show the use of both childtags. Just add the following method to the file.

Update. Button? Try running it, and click the two buttons. You will notice that then first button updates only the first datestamp, while the second button updates both. We have set the Panels to update conditionally, which means that their content is only updated if something insides them causes a postback, or if one of the defined triggers are fired. This will ensure that the first panel is updated even when a control on a different Update. Panel is used. If you wish for the content of a Update. Panel to be updated no matter what, you may change the updatemode property to Always.

Don't wrap your entire page within an Update. Panel, and don't be afraid to use several panels, since this will give you more control of which areas update and when they do it.