jsf - Creating custom tag for Converter with attributes -
i have found converter online , changed needs far could. problem though need add flag (i.e. string) must checked , converter must apply pattern string.
custom converter:
@facesconverter("convtest.urlconverter") public class urlconverter implements converter { @override public object getasobject(facescontext facescontext, uicomponent component, string value) { stringbuilder url = new stringbuilder(); if(value!=null){ if(value.length()==13){ string tempstring; tempstring=value.tostring(); string finalstring= tempstring.substring(0, 4) + "-" + tempstring.substring(4, 8) + "-" + tempstring.substring(8, 13); url.append(finalstring); }else{ url.append(value); } }else url.append(""); try { new uri(url.tostring()); } catch (urisyntaxexception e) { return null; } urldata urldata = new urldata(url.tostring()); return urldata; } @override public string getasstring(facescontext facescontext, uicomponent component, object value) { try { return value.tostring(); } catch (exception e) { return null; } } } xhtml:
<h:inputtext value="#{userdata.data}"> <f:converter converterid="convtest.urlconverter" /> </h:inputtext> now problem example have 2 conversion types:
hjuzurt
let's hju have output format xxxx-xxxx-xxxxx , zurt has output format xx-xx-xx-xx-xx-xx-x.
now call converter example:
<f:converter converterid="convtest.urlconverter" type="hju" /> or , use correct pattern.
any ideas on how this?
you need register custom converter new tag in *.taglib.xml wherein can specify many attributes want mapped bean properties of converter instance.
so, given new property type:
@facesconverter("convtest.urlconverter") public class urlconverter implements converter { private string type; // +getter+setter } and /web-inf/my.taglib.xml (assuming jsf 2.x on facelets):
<?xml version="1.0" encoding="utf-8"?> <facelet-taglib xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facelettaglibrary_2_0.xsd" version="2.0" > <namespace>http://example.com/ui</namespace> <tag> <tag-name>urlconverter</tag-name> <converter> <converter-id>convtest.urlconverter</converter-id> </converter> <attribute> <name>type</name> <type>java.lang.string</type> </attribute> </tag> </facelet-taglib> which registered below in /web-inf/web.xml:
<context-param> <param-name>javax.faces.facelets_libraries</param-name> <param-value>/web-inf/my.taglib.xml</param-value> </context-param> then usage should do:
<html ... xmlns:my="http://example.com/ui"> ... <h:inputtext ...> <my:urlconverter type="hju" /> </h:inputtext> <html ... xmlns:my="http://example.com/ui"> ... <h:inputtext ...> <my:urlconverter type="zurt" /> </h:inputtext> alternatively, if happen use jsf utility library omnifaces, can save above xml boilerplate using <o:converter> below:
<html ... xmlns:o="http://omnifaces.org/ui"> ... <h:inputtext ...> <o:converter converterid="convtest.urlconverter" type="hju" /> </h:inputtext> <html ... xmlns:o="http://omnifaces.org/ui"> ... <h:inputtext ...> <o:converter converterid="convtest.urlconverter" type="zurt" /> </h:inputtext> it transparently set attributes converter properties.
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