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<mias:field id="lastName" required="true" bean="#{pageFlowScope.selectedEmployee}"/> generate, create datamatrix none on software projects VB.NET [ 201 ]. Advanced Trinidad Using AJAX and Partial Page Rendering Although the big AJAX hype is over, today a web application cannot be taken seriously if it doesn t leverage some AJAX functionality. And that s a good thing, as AJAX can help us to make our applications more interactive and user-friendly. In the early days of Trinidad, when it was still called Oracle ADF Faces, and before the big AJAX hype started off, it already had a feature called Partial Page Rendering , or PPR for short.

In those days this feature used inline frames under the hood. Today Trinidad still calls this feature Partial Page Rendering, although it s now based on real AJAX technologies, such as XMLHttpRequest and JavaScript. That is, by the way, a great example of the benefits of the abstraction that JSF components give us.

Because of this abstraction, the Trinidad team was able to re-implement the whole Partial Page Rendering feature using AJAX technology, while keeping the way we use Partial Page Rendering in our pages the same. That means we can still use this feature without writing any JavaScript or Dynamic HTML ourselves..

The JSF 1.2 standard d Data Matrix 2d barcode for None oesn t say anything about AJAX support. This lack of support from the framework led to the situation where every component library implemented its own AJAX solution, as did Trinidad with Partial Page Rendering.

In the new JSF 2.0 standard, support for AJAX is now embedded in the framework. This means that when we start to use JSF 2.

0, we don t need component library specific solutions like Trinidad PPR any more. But for JSF 1.2, Trinidad PPR is a good solution for getting AJAX functionality in a JSF application in an easy way.

. OK, that s enough background. Let s see how PPR works. Comparing full submit and partial submit Without PPR, when we push a b utton that is rendered by a <tr:commandButton> component, the browser will post all of the data that is entered on the page to the server and will wait for the server to answer by sending a whole new page. Even if the button does not invoke a navigation action (we re staying on the same page), the server will resend the whole page. Whenever this happens, you ll notice that the progress indicator of your browser will start moving to indicate that a new page is being loaded from the server.

Let s call this cycle a full submit.. [ 202 ]. 6 . With PPR, we can tell a <t Data Matrix barcode for None r:commandButton> component (or a <tr:commandLink> component) to do a partial submit instead. In this case, a piece of JavaScript will post the form data to the server and wait for the response from the server while the browser keeps displaying the page. After the JavaScript code receives the answer from the server, it will update the page accordingly.

You can see this happening when you push a button and the progress indicator of your browser doesn t start moving. We can use network monitoring software to intercept the requests to the server and the answers from the server, in order to investigate the difference more quantitatively. Eclipse has a built-in TCP / IP monitor that can be used for this.

With this tool, we can look at the data traffic generated by a single push on the Apply button on the EditKid.xhtml page of our example application. The following table lists the results of a single measurement with this tool:.

Partial submit Number of requ ests Total bytes sent Total bytes received 1 900 661 Full submit 3 1,884 40,559 Factor 3.0 2.1 61.

4. While this is by far not a sc data matrix barcodes for None ientific measurement, it is clear that we can save a lot of data traffic between the browser and the server by using partial submits. Enabling partial submits is as simple as setting the partialSubmit attribute of a <tr:commandButton> or <tr:commandLink> component to true. While this can be a nice way to make web applications more responsive, this is not the sexy AJAX stuff that people are looking for.

So let s explore some more PPR possibilities..
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