itextsharp barcode vb.net FIGURE 10-8 The InputDate UI component in Java

Generate DataMatrix in Java FIGURE 10-8 The InputDate UI component

FIGURE 10-8 The InputDate UI component
Encoding DataMatrix In Java
Using Barcode encoder for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
Data Matrix Scanner In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
10:
Bar Code Creation In Java
Using Barcode maker for Java Control to generate, create bar code image in Java applications.
Barcode Recognizer In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Building Custom UI Components
Data Matrix ECC200 Generator In C#.NET
Using Barcode generator for .NET framework Control to generate, create ECC200 image in VS .NET applications.
Print ECC200 In .NET
Using Barcode generation for ASP.NET Control to generate, create Data Matrix image in ASP.NET applications.
Using the InputDate Component
ECC200 Encoder In .NET Framework
Using Barcode printer for Visual Studio .NET Control to generate, create Data Matrix 2d barcode image in Visual Studio .NET applications.
Encode ECC200 In VB.NET
Using Barcode generation for Visual Studio .NET Control to generate, create ECC200 image in Visual Studio .NET applications.
Using the InputDate component in a JSP is quite simple, as shown here:
Generating GS1-128 In Java
Using Barcode creator for Java Control to generate, create EAN 128 image in Java applications.
Encode Matrix 2D Barcode In Java
Using Barcode printer for Java Control to generate, create Matrix Barcode image in Java applications.
<p> <jcr:inputdate value="#{ExampleUserdob}" size="12" startyear="1930" endyear="2020" > <f:convertDateTime pattern="MM-dd-yyyy"/> </jcr:inputdate> <h:commandButton value="Enter"/> </p>
ANSI/AIM Code 128 Creator In Java
Using Barcode creation for Java Control to generate, create Code 128C image in Java applications.
Drawing Linear Barcode In Java
Using Barcode generation for Java Control to generate, create Linear 1D Barcode image in Java applications.
The first thing to notice is that the component is value-bound to a managed bean property, dob (date of birth), which is of type javautilDate The other tag attributes, size, startyear, and endyear, are optional but affect the display of the component The inputDate also allows for the use of a standard Converter where a specific DateTime pattern can be associated with the date At runtime, the date will render with the pattern MM-dd-yyyy (The commandButton is purely to allow for a form submission)
Royal Mail Barcode Drawer In Java
Using Barcode generator for Java Control to generate, create British Royal Mail 4-State Customer Barcode image in Java applications.
Generate Bar Code In Visual Basic .NET
Using Barcode creator for .NET Control to generate, create bar code image in .NET framework applications.
PART II
Barcode Decoder In C#.NET
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in Visual Studio .NET applications.
Barcode Creator In None
Using Barcode creator for Word Control to generate, create barcode image in Microsoft Word applications.
The Code Behind the InputDate Component
ANSI/AIM Code 39 Generation In VS .NET
Using Barcode maker for ASP.NET Control to generate, create Code-39 image in ASP.NET applications.
Encoding Code 128B In Objective-C
Using Barcode creator for iPad Control to generate, create Code 128 Code Set C image in iPad applications.
When the rendering logic is separated from the actual UI component, the code for a UI component can be rather simple In this case, the code needed for the InputDate component is just enough to extend an existing reference implementation component, UIInput, and associate it with a rendering family InputDateFamily The InputDateFamily is a family of renderers that will include separate renderers for rendering the inputDate component in both HTML and WML The code for the InputDate component is
Create GTIN - 12 In None
Using Barcode generation for Online Control to generate, create Universal Product Code version A image in Online applications.
Print Code-39 In None
Using Barcode creation for Font Control to generate, create Code39 image in Font applications.
package comjsfcomprefcomponentscomponent; import javaxfacescomponentUIInput; import javaxfacescomponentValueHolder; public class InputDate extends UIInput implements ValueHolder { public String getFamily() { return "InputDateFamily"; } }
As with all custom components, the InputDate component also has to be registered in faces-configxml:
<component> <component-type>InputDate</component-type> <component-class> comjsfcomprefcomponentscomponentInputDate </component-class> </component>
Part II:
Extending JavaServer Faces
The HtmlInputDateRenderer
As you ll now see, the bulk of the InputDate component is in the renderer It is the role of the renderer to both present the component as well as receive input from the client As you recall from earlier examples, this is done through encode methods to display the component, and decode methods to parse the incoming form values
E XPERT GROUP I NSIGHT The name renderer was debated by the expert group since it really
doesn t convey the full meaning of what is done A renderer not only renders the component, it also converts the submitted input from the client into the proper form for the component As such, another name for renderer was ClientAdapter but this was discarded as being too cumbersome The core structure of the HtmlInputDateRenderer class is as follows (The code for each method is omitted for brevity and will be shown later)
package comjsfcomprefcomponentscomponent; // import statements omitted public class HtmlInputDateRenderer extends Renderer { public HtmlInputDateRenderer() { super(); } private static final String MONTH = "month"; private static final String DAY = "day"; private static final String YEAR = "year"; //Renderer default values private static final int defaultInputFieldSize = 10; private static final int defaultStartYear = 1980; private static final int defaultEndYear = 2025; // In a production component, these would be localized names static String monthnames[] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }; // Rendering begins here public void encodeBegin(FacesContext context, UIComponent component) throws IOException { //Declare threadsafe method variables for current month, day & year int currMonth, currDay, monthMaxDay, currYear; // Initialize current date values EditableValueHolder inputdate = (EditableValueHolder)component; Calendar tempcal = new GregorianCalendar(); // Get current value of Date and apply - if null set date to today Date dateval = (Date)inputdategetValue(); if (dateval != null) tempcalsetTime(dateval);
10:
Building Custom UI Components
else tempcalsetTime(new javautilDate()); currMonth = tempcalget(CalendarMONTH); currDay = tempcalget(CalendarDAY_OF_MONTH); monthMaxDay = tempcalgetActualMaximum(CalendarDAY_OF_MONTH); currYear = tempcalget(CalendarYEAR); ResponseWriter writer = contextgetResponseWriter(); String clientId = componentgetClientId(context); encodeInputField(writer, clientId, context, component); encodeMonthSelect(writer, clientId, component, currMonth); encodeDaySelect(writer, clientId, component, currDay, monthMaxDay); encodeYearSelect(writer, clientId, component, currYear); } // The bodies of the encode methods and single decode method // are omitted here but shown later }
PART II
As you can see in the code, the component s Date value is extracted into separate, thread-safe currMonth, currDay, monthMaxDay, and currYear variables However, if the component s Date value is null, it sets them to values based on today s date (The monthMaxDay value is used to determine the maximum days in a particular month) To ensure thread safety, the date variables (currMonth, currDay and so on) are declared in the encodeBegin( ) method so they are not instance member variables
Copyright © OnBarcode.com . All rights reserved.