Selectize.js plugin to load static options alongside remote options

persist_initial_options-selectize-plugin.js

Selectize.define('persist_initial_options', function(options) {

	var self = this,
			initialOptions = [];

	this.onInitialize = (function() {
		var original = self.onInitialize;
		initialOptions = Object.keys(self.options);
	})();
	
	this.onSearchChange = (function() {
		var original = self.onSearchChange;
		return function(value) {
			if (!value.length) {
				Object
					.keys(self.options)
					.diff(initialOptions)
					.forEach(function(id){
						self.removeOption(id);
					});			  
			}
			return original.apply(self, arguments);
		};
	})();
	
	this.addOption = (function() {
		var original = self.addOption;
		return function(data) {
			return original.apply(self, arguments);
		};
	})();

	Array.prototype.diff = function(a) {
		return this.filter(function(i) {return a.indexOf(i) < 0;});
	};
	
});