ssrs code 128 barcode font Ajax Portability in Font

Drawer DataMatrix in Font Ajax Portability

Ajax Portability
Making DataMatrix In None
Using Barcode generator for Font Control to generate, create ECC200 image in Font applications.
www.OnBarcode.com
Barcode Generator In None
Using Barcode encoder for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Thankfully, since the implementation of JavaScript in most browsers is almost identical, it is quite easy to migrate JavaScript code for use within each individual browser; only concerns directly relating to a browser s DOM (document object model) can cause issues with the JavaScript. Since JavaScript will run in each browser, Ajax becomes very portable (at least at the time of this writing). Since it seems that the browsers are all trying hard to come to a common set of standards or guidelines, it would be a fairly solid wager to assume that coding in Ajax-based JavaScript will only become more portable as time goes on. That being said, the common problem with Ajax-based portability becomes users who choose to not let JavaScript be executed within their web sites. Because the execution of JavaScript code is an option that can be turned on and off from the user s web browser, it is important to create alternatives for all Ajax-based code, in the case that the user decides to not allow JavaScript. This is where both careful layout and server-side processing become important.
PDF 417 Creator In None
Using Barcode encoder for Font Control to generate, create PDF-417 2d barcode image in Font applications.
www.OnBarcode.com
Painting Barcode In None
Using Barcode creation for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
CHAPTER 11 CROSS-BROWSER ISSUES
Code 128 Code Set A Printer In None
Using Barcode generation for Font Control to generate, create Code-128 image in Font applications.
www.OnBarcode.com
USS-128 Maker In None
Using Barcode generation for Font Control to generate, create EAN 128 image in Font applications.
www.OnBarcode.com
In order to make Ajax applications as portable as possible, there are ways to write the code such that if the Ajax-based functionality fails to execute, the system will instead create a more straightforward request to the web browser and still perform the functionality required. While this certainly increases the amount of coding time necessary to create a working application, it ensures the most seamless browsing experience for your user. There are a number of ways to handle applications that direct their processes based on whether the user has JavaScript enabled. It is important to remember this both when creating requests to the server and when handling validation. Remember to always validate both on the server side and client side of a process. While this may seem slightly redundant, if a user turns off JavaScript, they can get around any validation you may have coded with your JavaScript. Now, let s have a quick look at the code that makes this functionality happen. As you can imagine, the code found in process_form.php merely outputs the results, and the code found in style.css merely styles the page, so there is no need to see either script (they are available for download from the Apress web site). Let s, however, have a look at the page with the form on it (Listing 11-1) to see how the Ajax takes effect or in the case of JavaScript being turned off does not.
Printing QR In None
Using Barcode drawer for Font Control to generate, create QR Code JIS X 0510 image in Font applications.
www.OnBarcode.com
RoyalMail4SCC Encoder In None
Using Barcode generator for Font Control to generate, create Royal Mail Barcode image in Font applications.
www.OnBarcode.com
Listing 11-1. A Form Set Up to Use Ajax Functionality to Submit (sample11_1.html)
Print Data Matrix In None
Using Barcode generator for Online Control to generate, create ECC200 image in Online applications.
www.OnBarcode.com
Create ECC200 In Objective-C
Using Barcode generator for iPhone Control to generate, create ECC200 image in iPhone applications.
www.OnBarcode.com
<!--Sample11_1.html--> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script src="functions.js" type="text/javascript"></script> <link rel="stylesheet" type="text/css" href="style.css" /> <title>Sample 11_1</title> </head> <body> <h1>Email Submission Form</h1> <div id="formsubmittal"></div> <form action="process_form.php" method="post" name="theform" onsubmit="processajax('process_form.php','formsubmittal',getformvalues(this), this); return false;"> <div class="formwrapper"> Enter your Name:<br /> <input name="yourname" maxlength="150" /><br /> Enter your Email Address:<br /> <input name="youremail" maxlength="150" /><br /> Submit a Comment:<br /> <textarea name="comment"></textarea>
Scan PDF 417 In Visual C#.NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Read EAN128 In C#.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
CHAPTER 11 CROSS-BROWSER ISSUES
UPC-A Supplement 2 Drawer In Java
Using Barcode generator for BIRT reports Control to generate, create UPC A image in BIRT applications.
www.OnBarcode.com
Generate Code 128 In Java
Using Barcode drawer for Java Control to generate, create Code 128 Code Set C image in Java applications.
www.OnBarcode.com
</div> <input type="submit" value="Submit" /> </form> </body> </html>
Code-128 Drawer In Objective-C
Using Barcode generator for iPad Control to generate, create ANSI/AIM Code 128 image in iPad applications.
www.OnBarcode.com
Printing Code-128 In None
Using Barcode maker for Online Control to generate, create ANSI/AIM Code 128 image in Online applications.
www.OnBarcode.com
The important part of this particular script is the submit button. Now, when you go to submit the form, the form attempts to process the onclick event, which is a call to the JavaScript function processajax. If the function executes properly, the JavaScript will process the form in Ajax style. If, however, the function is not able to execute (this will happen if return false is never activated, which is a result of having JavaScript disabled), the form will merely submit in the normal way and proceed to the URL designated by the action attribute of the form tag.
Make Code 128 In Visual Studio .NET
Using Barcode printer for Reporting Service Control to generate, create Code 128 Code Set A image in Reporting Service applications.
www.OnBarcode.com
1D Barcode Printer In VS .NET
Using Barcode encoder for VS .NET Control to generate, create Linear 1D Barcode image in .NET framework applications.
www.OnBarcode.com
Saving the Back Button
PDF-417 2d Barcode Scanner In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
QR Code 2d Barcode Drawer In None
Using Barcode encoder for Microsoft Excel Control to generate, create QR Code JIS X 0510 image in Microsoft Excel applications.
www.OnBarcode.com
One of the fundamental problems with using Ajax is that certain key elements of a browser and a user s browsing experience tend to break. Of those key elements, perhaps none is more problematic and potentially devastating that the breaking of the Back and Forward buttons on the browser. People have been using those buttons for years to navigate the Internet, and have come to rely on them to the point where navigating the Web would not be the same without them. It is therefore a bit of a problem that Ajax tends to break that functionality outright. Since the Back and Forward buttons perform based on each page refresh, and since Ajax fires requests to new pages within a page itself, the history does not get updated. Therefore, with no history in place, the Back and Forward buttons cannot function. What can we as developers do to alleviate this problem The quick fix is to ensure that all users have a means to navigate within the site using in web site navigation. While this ensures that navigation is indeed possible, it still does not bring back the Back and Forward button functionality of the browser. In terms of a solution, redundant navigation might help, but certainly does not solve the underlying issue. What else is there to do Well, thankfully, some individuals have been working to bring code libraries into play that can help to alleviate the issues of losing the Back button. Of these projects, I have found Really Simple History (RSH), written by Brad Neuberg, to be fairly handy and quite competent. The underlying principle of RSH is to create a history object within JavaScript and then update it whenever an action is made from your web application. It then uses anchor tags concatenated at the end of the URL to determine the current state of your application. By storing the states within history-based JavaScript objects, you can then code your application to respond to the Back and Forward buttons based on the anchor tags. The
Copyright © OnBarcode.com . All rights reserved.