print barcode in asp.net c# The enhanced Ajax web portal in Java

Generate QR in Java The enhanced Ajax web portal

The enhanced Ajax web portal
Quick Response Code Generator In Java
Using Barcode creation for Java Control to generate, create QR Code image in Java applications.
www.OnBarcode.com
Recognizing QR Code ISO/IEC18004 In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Save settings The save settings method is equally simplistic. Recall that this method is called by our AjaxWindows.js library adaptation on the mouseup event in order to store all move and size operations:
Barcode Encoder In Java
Using Barcode creation for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
Data Matrix 2d Barcode Encoder In Java
Using Barcode encoder for Java Control to generate, create Data Matrix image in Java applications.
www.OnBarcode.com
saveWindowProperties: function(id) { this.issuePortalCommand( Portal.SAVE_SETTINGS_ACTION, "ref=" + id, "x=" + parseInt(elemWin.style.left), "y=" + parseInt(elemWin.style.top), "w=" + parseInt(elemWin.style.width), "h=" + parseInt(elemWin.style.height) ); elemWin = null; },
USS-128 Creation In Java
Using Barcode printer for Java Control to generate, create UCC - 12 image in Java applications.
www.OnBarcode.com
Drawing EAN128 In Java
Using Barcode printer for Java Control to generate, create USS-128 image in Java applications.
www.OnBarcode.com
Adding/deleting windows Although we didn t fully develop the concept out of adding and deleting windows, at least from the perspective of providing a nice UI to initiate these actions, we can certainly define the command API methods that would support these operations, as shown here:
Barcode Drawer In Java
Using Barcode creator for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
Encoding Identcode In Java
Using Barcode creation for Java Control to generate, create Identcode image in Java applications.
www.OnBarcode.com
addWindow: function(title, url, x, y, w, h) { this.issuePortalCommand( Portal.ADD_WINDOW_ACTION, "title=" + title, "url=" + url, "x=" + x, "y=" + y, "w=" + w, "h=" + h ); }, deleteWindow: function(id) { var doDelete = confirm("Are you sure you want to delete this window "); if(doDelete) this.issuePortalCommand( Portal.DELETE_WINDOW_ACTION, "ref=" + id ); },
QR Code Creator In None
Using Barcode printer for Online Control to generate, create Quick Response Code image in Online applications.
www.OnBarcode.com
Encoding QR-Code In VS .NET
Using Barcode maker for .NET Control to generate, create QR Code image in .NET applications.
www.OnBarcode.com
This concludes our discussion of the APIs required to support the portal commands. Now let s look at our portal Ajax handling.
Printing GS1-128 In None
Using Barcode encoder for Microsoft Excel Control to generate, create EAN 128 image in Microsoft Excel applications.
www.OnBarcode.com
Painting QR Code ISO/IEC18004 In None
Using Barcode maker for Software Control to generate, create QR-Code image in Software applications.
www.OnBarcode.com
11.6.4 Performing the Ajax processing
ANSI/AIM Code 128 Drawer In Objective-C
Using Barcode generator for iPhone Control to generate, create Code 128 Code Set A image in iPhone applications.
www.OnBarcode.com
Code 128 Code Set A Creator In .NET
Using Barcode generation for Visual Studio .NET Control to generate, create Code 128A image in .NET framework applications.
www.OnBarcode.com
As already noted, in this example we re using an Ajax technique for handling responses in a script-centric way. The technique relies on the fact that the
Creating QR Code In VS .NET
Using Barcode generator for Reporting Service Control to generate, create QR Code 2d barcode image in Reporting Service applications.
www.OnBarcode.com
Generate Barcode In Objective-C
Using Barcode creation for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Refactoring
Generating Barcode In None
Using Barcode creator for Office Word Control to generate, create Barcode image in Word applications.
www.OnBarcode.com
Paint Barcode In Java
Using Barcode creator for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
expected response is valid JavaScript code. The thing that s very desirable about this kind of approach is that the client doesn t have to do any data-marshaling or parsing to grok (geek-speak for understand) the response. The response is simply evaluated via the JavaScript eval() method, and the client is absolved from all further responsibility. The negative side of this approach is that it puts the responsibility on the server to be able to understand the client-side object model and generate a syntactically correct language-specific (JavaScript) response. The second downside of this approach is partially addressed by the popular variety of this technique of using JSON to define our responses. There are some server-side libraries that aid in the generation of JSON responses (see chapter 3), although these are moving more toward what we described in chapter 5 as a data-centric approach. For now, we re going to stick to a script-centric system, so let s look at our implementation and see what we can do to help it along. Let s start with our ajaxUpdate() function and its helper runScript():
QR Code JIS X 0510 Generation In None
Using Barcode creation for Online Control to generate, create QR Code image in Online applications.
www.OnBarcode.com
Creating Quick Response Code In Objective-C
Using Barcode maker for iPad Control to generate, create QR image in iPad applications.
www.OnBarcode.com
ajaxUpdate: function(request) { this.runScript(request.responseText); }, runScript: function(scriptText) { eval(scriptText); },
As already discussed, the response handling is simple to a fault. All we do is call the runScript() method with the responseText, and the runScript() simply eval()s the response text. So why, you might ask, don t we just get rid of the runScript() method altogether and just call eval() from within the ajaxUpdate() method Well, that s certainly a valid and useful approach. It might be nice, however, to have a method that encapsulates the concept of running a script. For example, what if we added a preprocessing step or a postprocessing step to our runScript() implementation Again, we ve isolated a change point. Our ajaxUpdate() method is happily oblivious of the change, and we pick up the new behavior. One interesting application of this technique would be a preprocessor that does token replacement of values that reside on the client before executing. Finishing out our Ajax discussion with the ever-important handling of errors, let s show our handleError() method. Recall that just as the ajaxUpdate() method is an implied contract required for collaboration with the net.ContentLoader, so is the handleError(). The handleError() method is shown here:
The enhanced Ajax web portal
handleError: function(request) { if ( this.options.messageSpanId ) document.getElementById (this.options.messageSpanId).innerHTML = "Oops! Server error. Please try again later."; },
This method checks for the existence of the messageSpanId configuration property and, if it exists, uses it as the element to place an Oops! message onto the UI. The actual text of the message that s presented is something that could also be parameterized with the options object. This is an exercise left to the reader. With that, our portal component refactoring session has come to a close. We ve created a deceptively simple mechanism for providing Ajax portal management. Now let s take a few moments to review the focus of our refactoring and recap what we ve accomplished.
Copyright © OnBarcode.com . All rights reserved.