README

This module adds a AjaxSelectField and a AjaxMultiSelectField to select results returned from an ajax endpoint.

Result Fetching

Results can be fetched from a custom endpoint (using the setEndpoint(ENDPOINT_URL) method) or using a callback function passed in to the field using setSearchCallback (see example below).

The response has to be a JSON array with an object per result, where each result has to have at least an id and title field, so for example:

[
    {
        "id": 1,
        "title": "Home"
    },
    {
        "id": 2,
        "title": "Contact Us"
    }
]

Storage

Single Select (AjaxSelectField)

By default the whole result (with all it's properties) will be stored in the DB as JSON string, although there is also an "id only" mode.

So the DB value will look like { "id": "1", "title": "Home" } with idOnlyMode = false. With the mode activated only the id will be stored (as with the default DropdownField).

Multi Select (AjaxMultiSelectField)

The results will be stored as JSON array containing the IDs of the selected items, so e.g. ["1", "2"].

Methods / Options

setEndpoint(string)

Set a custom search endpoint by passing the whole url.

setSearchCallback(callable)

Pass a callback function executed on each search request. Uses the search method defined in the field class.

setMinSearchChars(int)

Change the amount of characters required for searches to be executed (defaults to 3).

setPlaceholder(string)

Change the default placeholder text of the input field.

setGetVars(array)

Set a list of custom GET vars which should be added to each request. Have to be in format ["key" => "value"].

setSearchHeaders(array)

Set a list of custom request headers sent with each search request. Have to be in format ["key" => "value"].

setIdOnlyMode(bool) [only single select]

En-/disable the idOnlyMode. If active the field will only store the "id" of the selected result. Otherwise the full result payload will be stored.

Note that the search endpoint or callback has to support requests with a ?id param returning only that one result if the mode is active.

setDisplayFields(array) [only multi select]

Define the list of fields to display for selected items, so basically the table columns. Defaults to id and title.

enableSorting / disableSorting [only multi select]

En-/disable the ability to sort the selected items by their display fields.

Installation

composer require level51/silverstripe-ajax-select-field

Usage Example

Single Select

AjaxSelectField::create('MyField', 'My Field Label')
    ->setSearchCallback(
        function ($query, $request) {
            // This part is only required if the idOnlyMode is active
            if ($id = $request->getVar('id')) {
                $page = SiteTree::get()->byID($id);
                return [
                    'id' => $page->ID,
                    'title' => $page->Title
                ];
            }

            $results = [];
            foreach (SiteTree::get()->filter('Title:PartialMatch', $query) as $page) {
                $results[] = [ 'id' => $page->ID, 'title' => $page->Title ];
            }

            return $results;
    })

Multi Select

AjaxMultiSelectField::create('MyField', 'My Field Label')
    ->setSearchCallback(
        function ($query, $request) {
            // Return detail info for the selected ids on load
            if ($ids = $request->getVar('ids')) {
                foreach (SiteTree::get()->filter('ID', $ids) as $page) {
                    return [
                        'id' => $page->ID,
                        'title' => $page->Title,
                        'urlSegment' => $page->URLSegment // example of a custom field, see also below
                    ];
                }
            }
            $results = [];
            foreach (SiteTree::get()->filter('Title:PartialMatch', $query) as $page) {
                $results[] = [ 'id' => $page->ID, 'title' => $page->Title, 'urlSegment' => $page->URLSegment ];
            }

            return $results;
    })->setDisplayFields([ 'title' => 'Custom Label', 'urlSegment' => 'URL' ])

Requirements

• SilverStripe ^4 | ^5
• PHP >=7.1
• ext-json

Maintainer

• Level51 hallo@lvl51.de