confused in converter

[ankur rathi]

I don't get the concept on Converter.

    
<f:view>
<h:form>
<h:inputText id="a1" value="#{ABean.isBean}">

</h:inputText>
<h:message for="a1"></h:message>
<h:commandButton action="#{ABean.test}">

</h:commandButton>
</h:form>
</f:view>

Above code works exactly as expected without the use of converter. When you enter integer or float, no issue, otherwise gives error 'Conversion error occured'.

I am just wondering what is the use of javax.faces.Float converter then?

BTW, isBean is float in ABean class.

[Bob Good]

you can do things like this:

    
<f:convertNumber 
  integerOnly="true" 
  maxFractionDigits="0" 
  type="number" 
  maxIntegerDigits="10" />
<f:validateDoubleRange 
  minimum="0.0" 
  maximum="9.999999999E9">
</f:validateDoubleRange>

[ankur rathi]

Originally posted by Bob Good:
you can do things like this:

    
<f:convertNumber 
  integerOnly="true" 
  maxFractionDigits="0" 
  type="number" 
  maxIntegerDigits="10" />
 

And what does this doing? Purpose?

[Ketan Jambhekar]

Hi,
One of the reason why you might want to use the converter is to alter the way you might want to display your data without actually modifying the object.
For eg. you can use a DateConverter and use a Date Object to display dates in various formats.
Similarly with the converter you have mentioned you can use to restrict the number of fractional digits.

Ketan.

[Bob Good]

It edits and formats for you, in this example:
1) Only allow integers, no decimals
2) Maximum value is 9999999999
3) Minimum value is 0 (no negative numbers)

You get field messages like this:

Validation Error: Specified attribute is not between the expected values of 0 and 9,999,999,999.