jsf 2 - When to name a converter in JSF -

-

i've been working converters in primefaces selectonemenu objects. work fine if tell class converter referring to:

@facesconverter(forclass = descriptorvo.class) public class descriptorvoconverter implements converter { ... }

this way, don't have explicitly tell jsf component converter should used when populated objects of class descriptorvo.

however, made page used p:selectmanycheckbox , couldn't life of me know why wasn't calling converter. gave name, so:

@facesconverter(forclass = rolevo.class, value = "rolevoconverter") public class rolevoconverter implements converter { ... }

and passed 1 of component's properties

<p:selectmanycheckbox id="cbx_roles" required="true" converter="rolevoconverter"     requiredmessage="at least 1 role must selected."     value="#{userview.selectedroles}" layout="responsive">     <f:selectitems value="#{userview.roles}" var="role"         itemlabel="#{role.title}" itemvalue="#{role}" /> </p:selectmanycheckbox>

and voi la, started calling converter correctly. raised question me regarding when should name converters (through value attribute) , when telling them class converter should used (with forclass attribute) enough. never had namy converters when working primefaces, particular selectmanycheckbox component. different components have different necessities regarding converters or did concept of converters wrong?

that can happen when value of uiselectmany component references generic java.util.collection type list<role> instead of array role[]. specified in javadoc of uiselectmany (emphasis mine):

obtain converter using following algorithm:

  • if component has attached converter, use it.

  • if not, valueexpression value (if any). valueexpression must point is:

    • an array of primitives (such int[]). registered by-class converter primitive type.
    • an array of objects (such integer[] or string[]). registered by-class converter underlying element type.
    • a java.util.collection. not convert values.

  • if reason converter cannot found, assume type string array.

the reason is, generic type <role> lost during runtime , not directly determinable. works when you're using myfaces instead of mojarra in case of java.util.collection inspect actual type manually iterating on <f:selectitem(s)> , determine converter based on first non-null value.

i created spec issue 1422 on in jsf spec , improve mojarra too.

see also:


Comments

Post a Comment

Popular posts from this blog

wordpress - (T_ENDFOREACH) php error -

-
creating wordpress website , i'm getting following php error: parse error: syntax error, unexpected 'endforeach' (t_endforeach) in /home/soralmedia/public_html/wp-content/themes/soral media/woocommerce/myaccount/my-orders.php on line 98 here's code file: <?php /** * orders * * shows recent orders on account page. * * template can overridden copying yourtheme/woocommerce/myaccount/my-orders.php. * * however, on occasion woocommerce need update template files , (the theme developer). * need copy new files theme maintain compatibility. try this. * little possible, happen. when occurs version of template file will. * bumped , readme list important changes. * * @see http://docs.woothemes.com/document/template-structure/ * @author woothemes * @package woocommerce/templates * @version 2.5.0 */ if ( ! defined( 'abspath' ) ) { exit; } $my_orders_columns = apply_filters( 'woocommerce_my_account_my_orders_columns', array( ...
Read more

Export Excel workseet into txt file using vba - (text and numbers with formulas) -

-
i new vba have developed code use in excel move text/numbers txt file. issue have 3 functions need go same txt file. when run first function has set fs = createobject("scripting.filesystemobject") set = fs.createtextfile(module1.nys45uploadfilename, true) a.writeline (str) a.close. the other 2 functions had save. set fs = createobject("scripting.filesystemobject") set = fs.savetextfile(module1.nys45uploadfilename, true) a.writeline (str) a.close. the first function go txt file, other 2 error object doesn't support property or method. when changed 3 create last function goes txt file. can not figure out word use in order make other 2 functions follow txt file in order keyed. the entire code follows private sub addrecord_click() on error goto errhandler module1.nys45uploadfilename = application.getsaveasfilename(filefilter:="textfiles (*.txt), *.txt") if module1.nys45uploadfilename = "false" exit sub ...
Read more

delphi - cxGrid : instead of "go to next cell on enter" using "enter" do that with the arrow keys -

-
Image
is there way can achieve cxgrid's functionality "go next cell on enter" using arrow keys on keyboard instead of hitting "enter" ??? right can navigate arrow keys cells move not selected (blue color). if edit cell in column , move cell beneath (with arrow key) , grid jumps other random record in grid,which annoying. is question of settings or must program functionality ? edit : simple temporary table use gather data. has no indexed fields or autoinc field : procedure tform3.cxbutton1click(sender: tobject); begin datamodule2.acrquery2.close; datamodule2.acrquery2.sql.clear; datamodule2.acrquery2.sql.text :='insert temp select company_id,member_id,surname,name members company_id =:a1'; datamodule2.acrquery2.params.parambyname('a1').value :=cxlookupcombobox2.text; datamodule2.acrquery2.execsql; datamodule2.acrquery3.close; datamodule2.acrquery3.sql.clear; datamodule2.acrquery3.sql.text :='update temp set month=:a1,year=:a2'; data...
Read more