actionscript 3 - Bidirectional binding for flex ComboBox? -


i have collection want bind data input combobox:

private static var logos:arraycollection = new arraycollection([  {index:0, label=logo1},   {index:1, label=logo2} ]);  <s:combobox selecteditem="@{model.labelindex}" labelfield="@label" dataprovider="{logos}" />

now, when selecting item, binding should send associated index property of objext model , update labelindex. of course not work above, because labelindex of different datatype arraycollection.

[bindable] private var model:mymodel;  [bindable] class mymodel {    public var:number labelindex; }

question: how can map array element model , vice versa?

what looking require scripting, binding isn't smart enough figure out how handle on own.

you can use bindingutils class define bindings, , use chain argument of bindproperty method modify how values being looked up.

http://help.adobe.com/en_us/flashplatform/reference/actionscript/3/mx/binding/utils/bindingutils.html

for combo.selecteditem model.labelindex binding, can specify chain array, elements define path value:

bindingutils.bindproperty(model, 'labelindex', combo, ['selecteditem', 'index']);

this bind selecteditem property, , pass value of items index property.

the other way around little more tricky , require using getter function grabs object datasource, based on labelindex value:

bindingutils.bindproperty(combo, 'selecteditem', model, {     name: 'labelindex',     getter: function(host:mymodel):object     {         return logos.source.filter(function(item:object, index:int, array:array):boolean         {             return item.index === host.labelindex;         })[0];     } });

this bind labelindex property, , getter function invoked when property changes. function filter datasource based on models changed labelindex property value, , return source object matching index property value, set combobox selecteditem property.

your combobox definition of course need id in order targetable via script

<s:combobox id="combo" dataprovider="{logos}" />

note there's no need forthe @ in labelfield property, used xml datasources need target attribute. however, don't need specify @ all, since label default value of labelfield property.


Comments

Post a Comment

Popular posts from this blog

powershell Start-Process exit code -1073741502 when used with Credential from a windows service environment -

i'm running strange behavior powershell start-process call. here call: $process = start-process ` "c:\somepath\mybinary.exe" ` -passthru ` -credential $defaultcredential ` -wait ` -workingdirectory "c:\somepath" ` -loaduserprofile if ($process.exitcode -ne 0) { #do } this call return exit code - 1073741502 . after quick search, exit code seems related generic error when program not load required dll (aka. status_dll_init_failed ). when run without -credential $credential program runs correctly. in order isolate problem, manually launched some.exe in prompt target credential , runs smoothly. so problem seems come way start-process cmdlet launch process. i found potential solutions problem tried apply no luck : link , link . would have idea of what's going on here ? edit 1: run proc mon monitoring program activities when launched directly or via powershell script. problem seems occur when loading kernelbase
Read more

twig - Using Twigbridge in a Laravel 5.1 Package -

i'm trying create laravel 5.1 package uses twigbridge instead of .php views. can normal .php views display fine, when try make use of .twig templates i'm met error. possible use twigbridge templates when creating views laravel package or pretty stuck blade , php ? edit 1: loading twig template without extending works. it's when start using {% extends 'file' %} error comes out. i error error loading /virtual/laravel/packages/username/mypackage/src/views/sample.twig: template "templates.master" not defined () in "/virtual/laravel/packages/username/mypackage/src/views/sample.twig" @ line 1. my folders username |_ mypackage |_ src |_ controllers - samplecontroller.php |_ views |_ templates - master.twig - sample.twig twig template sample.twig {% extends 'templates.master' %} {% block content %} {{ parent()
Read more

c# - LINQ join Entities from HashSet's, Join vs Dictionary vs HashSet performance -

i have hashset's each stores t, have written test application compares different relation algorithms can think of, i'm not pleased results getting. does there exist more efficient ways of achieving object relations, once testing? using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.diagnostics; namespace linqtests { class program { static void main(string[] args) { hashset<user> usertable = new hashset<user>(); hashset<userproperty> userpropertytable = new hashset<userproperty>(); #region lets create dummy data. console.writeline("please wait while creating dummy data, can take while..."); console.writeline(""); int rows = 1000000; for(int x = 0; x < rows; x++) { random rnd = new random(); // ad
Read more