Adobe Flex Authors: Matthew Lobas, PR.com Newswire, Shelly Palmer, Kevin Benedict

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Adobe Flex: Article

The NumericStepper Component

One of flash's hidden gems

This example gave us a nice simple introduction to the component. We can now build on these foundations by creating more complex creations for use in your projects.

Date Selection
The source FLA file for this example is NumericStepperDates.fla.

This example is a little different as it uses the NumericStepper component to create simple date controls within the application. These date controls might be used within an online application form, or a Flash-driven blog-searching application. In this example, we'll just send the output of a function to the Output Panel.

Setting the Stage
We'll use some of the same core code that we used in the previous example and build upon that to create a different outcome; also in this example we will populate the NumericStepper component using ActionScript rather than hard-coding its contents via the Property Inspector.

  1. Create a new Flash document with default properties and rename the default layer Actions. Below it, add a further layer called Components.
  2. Drag 2 instances of the NumericStepper component from the UI Components section of the Components Panel into the first frame of the Components layer. Name the instances StepperYear and StepperMonth.
  3. Add relevant text labels above each component (e.g. Select Year, Select Month).
Adding the ActionScript
It's now time to populate the components with the values we want for the month and year. When the values in either of the component instances change, the selected date is pushed to the Output Panel.
  1. Select the first frame of the 'Actions' layer and add the following code within the Actions Panel: Note: Code highlighted in bold has been altered from the previous example.

    var monthArray = new Array ();
    monthArray = ["January", "February", "March", "April", "May", "June",
    "July", "August", "September", "October", "November", "December"];

    var palletteArray = new Array();
    palleteArray = ["0x7FAAD4", "0xFFDF7F"];
    function setTheme() {
    _global.style.setStyle("themeColor", palleteArray[0]);
    _global.style.setStyle("backgroundColor", palleteArray[1]);
    _global.style.setStyle("fontSize", 11);
    _global.style.setStyle("fontWeight", "bold");
    _global.style.setStyle("color", palleteArray[0]);

    var stepsListener = new Object();
    stepsListener.change = function() {
    stepperYear.addEventListener("change", stepsListener);
    stepperMonth.addEventListener("change", stepsListener);

    function pushDate() {
    trace("The selected year is: "+stepperYear.value+
    "; the selected Month is: "+monthArray[stepperMonth.value-1]);
    function populateYearStepper() {
    var now = new Date();
    stepperYear.minimum = now.getUTCFullYear();
    stepperYear.maximum = now.getUTCFullYear()+10;
    stepperYear.stepSize = 1;
    stepperYear.value = now.getUTCFullYear();
    function populateMonthStepper() {
    var now = new Date();
    stepperMonth.minimum = 1;
    stepperMonth.maximum = 12;
    stepperMonth.stepSize = 1;
    stepperMonth.value = now.getUTCMonth()+1;
    Initially, we create a new array called monthArray, which holds the names of the months of the year; we will use this later in the example to get month names from the pushDate() function.

    Note that in this example, we tie both instances of the component to the same listener object. Whenever the value of either instance changes, the pushDate() function is called.

    1. stepperYear.addEventListener("change", stepsListener);
    stepperMonth.addEventListener("change", stepsListener);
    We have two functions in this example (populateYearStepper(), and populateMonthStepper()), both of which are called at startup. They dynamically populate the stepperYear and stepperMonth NumericStepper instances, respectively.

    The populateYearStepper() function creates a new date object, then pushes the minimum, maximum, stepSize and value properties into the stepperYear component instance using various iterations of the getUTCFullYear() method. This produces a minimum value, which is the current year, and a maximum value, which is the current year plus 10. It sets the step size to 1 and the initial value of the NumericStepper instance to the current year.

    A similar process occurs with the populateMonthStepper() function, which populates the stepperMonth instance with the month numbers (1-12). It then sets the initial value to the current month using the following code:

    The getUTCMonth() method returns an integer between 0 and 11, indicating the month value in the Date object (January will appear as 0, December as 11, etc.). We add 1 to this to obtain the number we wish to display in the NumericStepper.

    When either of the values of the NumericStepper instances change, the pushDate() function is called. We use this function to trace out the selected date. The year is simple enough to trace out, as we can easily get the value of the stepperYear NumericStepper instance using stepperYear.value.. But, in order to convert the zero-based month value into a month name, we need to look up its position within the monthArray array we initiated earlier.

    trace("The selected year is: "+stepperYear.value+
    "; the selected Month is: "+monthArray[stepperMonth.value-1]);
  2. Save your Flash document and preview your work.
When you click on either of the NumericStepper instances, the pushDate() function is called and the selected month and year are traced out to the Output Panel in a convenient manner. There are multiple iterations and uses of the NumericStepper component that can be derived from this example, so I suggest that you experiment and see how you can apply this component in your own projects.

Experimental Control
As we've already mentioned, another interesting application of the NumericStepper component is to use it as a control for experimental effects, such as the one shown in the screenshot at the beginning of this tutorial.

More Stories By Steven Grosvenor

Steven Grosvenor is founder of Phireworx.com. His job title changes more often than his socks, but we're sure he does something important for a Managed Internet Security company in Manchester. A Ph.D. in Molecular Virology has served Steven well in the web industry, bearing no relevance at all, but this hasn't stopped him progressing so deep into code that nobody else understands. When not worked to death, his wife and young children ensure he can relax at home.

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