Skip to main content

Converters in JSF 2

 Converters in JSF2 are used to easily convert a value from one data type to other. The following inbuilt converters are available in JSF2.

Converter Name Converter Class
Byte Converter javax.faces.convert.ByteConverter
Short Converter javax.faces.convert.ShortConverter
Character Converter javax.faces.convert.CharacterConverter
Boolean Converter javax.faces.convert.BooleanConverter
Integer Converter javax.faces.convert.IntegerConverter
Float Converter javax.faces.convert.FloatConverter
Double Converter javax.faces.convert.DoubleConverter
Long Converter javax.faces.convert.LongConverter
Big Integer Converter javax.faces.convert.BigIntegerConverter
Big Decimal Converter javax.faces.convert.BigDecimalConverter
Date Time Converter javax.faces.convert.DateTimeConverter
Number Converter javax.faces.convert.NumberConverter
Enum Converter javax.faces.convert.EnumConverter

 The JSF2 also allow developers to create a custom converter for their own purpose. The following rules are very important because almost all the developers are makes lot of mistake here.
 1. Before going to use any converter, we need to register that converter into faces-config.xml file (If you are going to create custom converter, this is important). Se the below example, Here I have registered Integer converter into facex-config.xml file.

  Integer
  javax.faces.convert.IntegerConverter

 2. By default all converter have error message. If converter can't able to convert the value, then it will display error message. So we need to register error message component for corresponding converter component.
 3. We need to bind a value of the component to managed bean property as the same type as the converter.
 4. We have two ways for registering converter component. The first one is using converter attribute directly on the component tag and another one is, we can nest a converter tag within the component tag and use converter tag's converterId attribute or binding attribute to reference the converter. Examples are here.


 
 In my upcoming post, I am going to give a small example for above converters.

Comments

Popular posts from this blog

Ext JS 4 – Creating web page using Ext.container.Viewport class and region propery

The Ext.container.Viewport is used for creating general web page and region property is used for splitting web page into different parts. Ext.container.Viewport is a specialized container represents the viewable area of the application (the browser area). It render itself to the document body, there is no need for providing renderTo property and it automatically sizes itself to size of the browser viewport. The viewport also re-size the child elements based on view area(based on browser width and height). The default layout of the viewport is border layout and we can customize this property according to our requirements. The viewport does not provide any scrolling. If necessary, the child elements(generally panels) within viewport needs to provide a scroll feature by using autoScroll property. See the below example for better understanding. This is Home.js file placed into app/view folder. Ext.define('MyApp.view.Home', { extend : 'Ext.container.Viewport&#

Getting key/value pair from JSON object and getting variable name and value from JavaScript object.

 Hi, I had faced one issue like this. I have an JSON object but I don't know any key name but I need to get the all the key and corresponding value from JSON object using client side JavaScript. Suddenly I wondered whether it's possible or not, after that I had done lot of workaround and finally got this solution. See the below example.    function getKeyValueFromJSON() {     var jsonObj =  {a:10,b:20,c:30,d:50} ;     for ( var key in jsonObj) {       alert( "Key: " + key + " value: " + jsonObj[key]);     }  }  In this example I have created the one json array as string, and converted this string into JSON object using eval() function. Using for-each loop I got all the key value from jsonObj, and finally using that key I got the corresponding value.  Finally I got the alert like this,    Key: a value:10    Key: b value:20    Key: c value:30    Key: d value:50  During this workaround I got one more idea, using this same way I got

Simple Login Application Using Spring MVC and Hibernate – Part 1

 I hope developers working in web application development might hear about MVC architecture. Almost all technologies provide support for MVC based web application development, but the success is based on many factors like reusable of the code, maintenance of the code, future adaption of the code, etc..,  The success of the Spring MVC is “ Open for extension and closed for modification ” principle. Using Spring MVC the developers can easily develop MVC based web application. We don’t need any steep learning curve at the same time we need to know the basics of spring framework and MVC architecture. The Spring MVC consists of following important components. 1. Dispatcher servlet 2. Controller 3. View Resolver 4. Model Spring MVC - Overview  The overall architecture of Spring MVC is shown here.  1. When “Dispatcher Servlet” gets any request from client, it finds the corresponding mapped controller for the request and just dispatches the request to the corresponding contro