Dropdown, ListBox, MultiSelect: support custom filter function

[VsevolodGolovanov]

Current behavior

Expected behavior
Dropdown, ListBox and MultiSelect should support filterMatchMode="custom" with a custom filterFunction. Like DataTable and TreeTable do.

Minimal reproduction of the problem with instructions

Please tell us about your environment:

• React version:

• PrimeReact version:
  4.2.2

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

• Language: [all | TypeScript X.X | ES6/7 | ES5]

[melloware]

Fixed with: #3039

[Qcyk]

Hi, I need add custom filter function in MultiSelect control. I need to use Regex to filter the data. I tried do this on two ways.

1. I use filterTemplate as it is shown in documentation, but it is not possible to put regex value to option.filter().

const myFilterFunction = (event, options) => { let _filterValue = event.target.value; setFilterValue(_filterValue); options.filter(event); }

2. In the filterTemplate I call my custom method (myFilterFunction) which change the options array in MultiSelect, but in this example I have a problem with filterring. When options array is empty I have a null instead of value in the MultiSelect control
   <InputText value={filterValue} ref={filterInputRef} onChange={(e) => myFilterFunction(e)} />

Is there any different way to use a custom filter method to filter data in MultiSelect control?
I am grateful for the help.
Regards,

[francislavoie]

@melloware I realize this is a long-closed issue, but this issue was most definitely not fixed with that change.

The request here is to have a custom filter function which allows the user to do arbitrary filtering of their own. The linked PR only changed the way the filterable string is composed. That's not the same thing.

I want to be able to do a multi-pass filter for example, like "split the filter string by words (spaces) then check that every word appears in one of the results". That would be useful because we have tagging on our entries with text like Blah blah [Foo] so I want to be able to search "foo blah" and find that entry.

I could easily write that filter function myself, but as-is, it's impossible to do so with Dropdown, so I'm forced to reach to a totally different solution, like opening a Menu and managing my own list and make my own filter input, etc etc. Totally overkill for what would be simply fixed by allowing us to override the filter function.