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In this chapter we ll develop a small feedback form using JavaFX controls. Different control types will collect the answers to our questions, a persistent storage API will save this data, and some chart/graph controls will display the resulting statistics (see figure 7.1). Along the way we ll also expand our knowledge of JavaFX s container nodes. There are just two classes in this project, but they pack quite a punch in terms of new material covered. As with previous projects, the code has been broken into versions. Version 1 will focus on building the input form using the new JavaFX 1.2 controls, and version 2 will save the data and create charts from it. Although we ll be covering only a subset of the controls available under JavaFX 1.2 buttons, text fields, radio buttons, and sliders there s enough variety to give you a taste of the controls library as a whole. We begin not with the controls but with a model class to bind our UI against.
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A bar chart, with 3D effect, showing feedback scores from contributors
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The Record class: a bound model for our UI
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To hold the data we re collecting for our form we need a class, such as the one in listing 7.1. Variables store the data for each field on the form, and a set of corresponding booleans reveals whether each value is valid. From a design point of view, it s useful to keep the logic determining the validity of a given field close to its data storage. In ye olde times (when AWT and Swing were all we had) this logic would be scattered across several far-flung event handlers, but not with JavaFX Script.
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Listing 7.1 Record.fx (version 1)
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package jfxia.chapter7; package def REGIONS:String[] = [ "Asia","America","Europe" ]; package class Record { package var name:String; package var email:String; package var region:Integer = -1; package var rating:Number = 0; package def validName:Boolean = bind ( name.length() > 2 ); package def validEmail:Boolean = bind ( (email.length() > 7) and (email.indexOf("@") > 0) ); package def validRegion:Boolean = bind (
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Name valid Email address valid
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Region set
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Controls, charts, and storage
region >= 0 ); package def validRating:Boolean = bind ( rating > 0 ); package def valid:Boolean = bind ( validName and validEmail and validRegion and validRating ); }
Rating set All fields valid
This is our initial data class: a model to wire into our UI s view/controller recall the Model/View/Controller (MVC) paradigm. The class consists of four basic feedback items, each with a corresponding Boolean variable bound to its validity, plus a master validity boolean:
The name variable holds the name of the feedback user, and the validName variable checks to see if its length is over two characters. The email variable holds the email address of the feedback user, and the validEmail variable checks to see if it is at least eight characters long and has an @ (at) symbol somewhere after the first character. The region variable stores the location of the user. A sequence of valid region names, REGIONS, appears at the head of the code, in the script context. The validRegion variable checks to see that the default, -1, is not set. The rating variable holds a feedback score, between 1 and 10. The validRating variable checks to see whether the default, 0, is not set.
An extra variable, valid, is a kind of master boolean, depending on the validity of all the other variables. It determines whether the Record as a whole is ready to be saved. This four-field data class is what we ll base our UI on. Sure, we could ask more than four questions (in the real world we certainly would), but this wouldn t really teach us anything new. The four we have will be more than enough for this project, but feel free to add your own if you want. We have a class to store the data; all we need now is a user interface.
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