JSF: Lesson – 6: Validating User Input in JSF #Java Short Notes

Target: Intermediate level web-developers.
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In web-application development, validating user inputs takes much efforts. JSF has made validations much easier than usual
JSF Built-in Validators:
- validateDoubleRange: Checks that the value provided is a double value. You can also set a minimum and a maximum.
- validateLongRange: Validates the input to be a long. It also has the optional minimum and maximum parameters.
- validateLength: Validates the length of a string
- Without the minimum and the maximum values these validators actually do nothing
You can also enforce a value as follows. If no value is provided, an error message is displayed
You can also create your own custom validator that should implement javax.faces.validator.Validator interface.
You have to implement the validate() method: validate(FacesContext arg0, UIComponent arg1, Object arg2) throws ValidatorException
In the error condition, you should throw ValidatorException from the validate method
Then you need to register the custom validator in the faces-config.xml file using a id as follows:
```
    currency.validator    net.justetc.jsf.CurrencyValidator  
```
From your JSP, you can refer to the validator as follows:
```
                                        
```

From: http://sitestree.com/?p=4997
Categories:Java Short Notes
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Post Data:2012-05-25 08:43:55

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