baixar leitor de qr code para celular java Building Custom UI Components in Java

Encoder QR Code in Java Building Custom UI Components

Building Custom UI Components
Quick Response Code Drawer In Java
Using Barcode generation for Java Control to generate, create QR Code JIS X 0510 image in Java applications.
QR Code ISO/IEC18004 Scanner In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
JSF 20 TIP This version of JSF allows the application developer to customize the character that is
Bar Code Drawer In Java
Using Barcode generation for Java Control to generate, create barcode image in Java applications.
Barcode Scanner In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
used to separate the parts of a client ID The default value of this character is : , but it can be changed by setting the javaxfacesSEPARATOR_CHAR context-param in the webxml file This is necessary when using CSS style sheets that want to use the IDs as CSS pseudoclasses
Creating Denso QR Bar Code In Visual C#.NET
Using Barcode encoder for .NET framework Control to generate, create Quick Response Code image in VS .NET applications.
Drawing QR Code In .NET Framework
Using Barcode encoder for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
The main point of the client ID, in all components, is to allow the UI component to identify them later during the decode process (which parses the incoming submitted data) Let s examine the source for these methods, beginning with encodeInputField( ), shown here:
QR Code 2d Barcode Generator In Visual Studio .NET
Using Barcode generator for Visual Studio .NET Control to generate, create QR Code image in Visual Studio .NET applications.
QR Code Creation In VB.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create QR Code image in Visual Studio .NET applications.
private void encodeInputField(FacesContext context, String clientId) throws IOException { // Render a standard HTML input field ResponseWriter writer = contextgetResponseWriter(); writerstartElement("input", this); writerwriteAttribute("type", "text", null); writerwriteAttribute("name", clientId, "clientId"); Object value = getValue(); if (value != null) { writerwriteAttribute("value", valuetoString(), "value"); } writerwriteAttribute("size", "6", null); writerendElement("input"); }
Bar Code Creation In Java
Using Barcode creation for Java Control to generate, create bar code image in Java applications.
Make Code 39 In Java
Using Barcode generation for Java Control to generate, create Code-39 image in Java applications.
PART II
Drawing Code128 In Java
Using Barcode creation for Java Control to generate, create Code128 image in Java applications.
Encode EAN13 In Java
Using Barcode printer for Java Control to generate, create EAN-13 Supplement 5 image in Java applications.
Notice the call to getValue( ) While rendering the input field, the value of the rendered HTML input field is set if the UI component s underlying value is not null Later, in the decode( ) method, you will see how to set a UI component s value The code for encodeSubmitButton( ) and encodeOutputField( ) is shown next:
Ames Code Printer In Java
Using Barcode maker for Java Control to generate, create Rationalized Codabar image in Java applications.
Bar Code Creator In .NET Framework
Using Barcode printer for Reporting Service Control to generate, create bar code image in Reporting Service applications.
private void encodeSubmitButton(FacesContext context, String clientId) throws IOException { // render a submit button ResponseWriter writer = contextgetResponseWriter(); writerstartElement("input", this); writerwriteAttribute("type", "Submit", null); writerwriteAttribute("name", clientId, "clientId"); writerwriteAttribute("value", "Click Me!", null); writerendElement("input"); } private void encodeOutputField(FacesContext context) throws IOException { ResponseWriter writer = contextgetResponseWriter(); String hellomsg = (String) getAttributes()get("value"); writerstartElement("p", this); writerwriteText("You entered: " + hellomsg, null); writerendElement("p"); }
Code128 Reader In Visual Studio .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET applications.
Code 128 Encoder In Java
Using Barcode encoder for BIRT Control to generate, create Code128 image in Eclipse BIRT applications.
Notice that encodeOutputField( ) uses an alternate way to retrieve the value of the hellomsg attribute, which differs from retrieving the actual value of the overall component, as was done in the encodeInputField( )
Drawing GTIN - 12 In VB.NET
Using Barcode generator for VS .NET Control to generate, create Universal Product Code version A image in .NET framework applications.
Encode ANSI/AIM Code 39 In None
Using Barcode generator for Software Control to generate, create Code 3 of 9 image in Software applications.
Part II:
Code 128 Code Set C Drawer In None
Using Barcode maker for Software Control to generate, create Code 128 image in Software applications.
Recognize Bar Code In C#.NET
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in .NET framework applications.
Extending JavaServer Faces
The final new method is the decode( ) method, which parses the incoming Request data after a postback occurs
@Override public void decode(FacesContext context) { Map requestMap = contextgetExternalContext()getRequestParameterMap(); String clientId = getClientId(context); char sep = UINamingContainergetSeparatorChar(context); String submitted_hello_msg = ((String) requestMapget(clientId + sep + "inputfield")); setSubmittedValue(submitted_hello_msg); }
Notice how the decode method uses the unique field identifier clientId + sep + "inputfield" to look up the specific parameter that contains the submitted value in the requestMap Recall that this was assigned in the encodeInputField( ) method Finally, we need to make an entry in the helloworldtaglibxml file
<tag> <tag-name>helloinput</tag-name> <component><component-type>HtmlHelloInput</component-type></component> </tag>
Using the helloinput tag in JSP is also trivial:
<vt:helloinput />
At runtime, the HtmlHelloInput component now renders the input, as shown in Figure 11-6
A JSF Stock Quote Component
To make the original HtmlHelloInput component more interesting, the component could be altered, or a new component based on HtmlHelloInput could be created This new component would present an input field as before but would accept it as a stock symbol and then pass it as an argument in a call to a stock quote Web service To build a stock quote variation of the HtmlHelloInput component, the following tasks need to be done: A Web service proxy (or client) has to be created that allows a Java application to make a call to a Web service that returns a current stock quote Since the Java code needed for Web service proxies/clients tends to be a bit cryptic and somewhat
FIGURE 11-6 The HtmlHelloInput component in action
11:
Building Custom UI Components
repetitive, it is best to use automatic Web service proxy/client generators, which are provided in many popular Java integrated development environments such as Oracle s JDeveloper or Sun s NetBeans IDE Once the proxy class is created, it can be instantiated and used in the UIComponent code directly, or it can be registered as a Faces-managed bean, making its methods accessible to the Faces application via method binding Once the proxy has been created, the UIComponent code can be altered to process a stock symbol attribute (as opposed to hellomsg) Instead of just displaying a simple message, the current stock price can be displayed This is accomplished by using the stock symbol as an argument to the stock quote Web service using the proxy
Copyright © OnBarcode.com . All rights reserved.