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Editing: archive-page-selector.js

import $ from 'jquery';

const { ajaxurl, VPAdminVariables } = window;

// multiple select with AJAX search
$( 'select[name="vp_general[portfolio_archive_page]"]' ).select2( {
	ajax: {
		url: ajaxurl, // AJAX URL is predefined in WordPress admin
		dataType: 'json',
		delay: 250, // delay in ms while typing when to perform a AJAX search
		data( params ) {
			return {
				q: params.term, // search query
				selected: this[ 0 ].value,
				nonce: VPAdminVariables.nonce,
				action: 'vp_get_pages_list', // AJAX action for admin-ajax.php
			};
		},
		processResults( ajaxData ) {
			const options = [];
			const data = this.$element.select2( 'data' );
			let alreadyAddedID = false;

// add selected value.
			if ( data && data[ 0 ] && data[ 0 ].selected ) {
				alreadyAddedID = Number( data[ 0 ].id );
				options.push( {
					id: alreadyAddedID,
					text: data[ 0 ].text,
				} );
			}

// parse new options.
			if ( ajaxData ) {
				// ajaxData is the array of arrays, and each of them contains ID and the Label of the option
				$.each( ajaxData, ( index, itemData ) => {
					if (
						! alreadyAddedID ||
						alreadyAddedID !== itemData[ 0 ]
					) {
						options.push( {
							id: itemData[ 0 ],
							text: itemData[ 1 ],
						} );
					}
				} );
			}

return {
				results: options,
			};
		},
		cache: true,
	},
} );