Persistent Filter for Angular ng-repeats.

persistent.filter.js

'use strict';

angular.module('core')

// Persistent filter, runs on any ng-repeat.
.filter('PersistentFilter', ['_', 'PersistentFilterStorage',
function (_, PersistentFilterStorage) {

  var pfs = PersistentFilterStorage;

  return function (items) {
    var filtered = [];
    for (var i = 0; i < items.length; i++) {
      var item = items[i];
      if (pfs.returnFilterTruthy(item)) {
        filtered.push(item);
      }
    }
    return filtered;
  };
}])

// Persistent filter storage factory. Keeps track of what we are
// filtering and why, etc.
.factory('PersistentFilterStorage', ['_',
function (_) {

  var service = {};

  service.filters = [];

  // Add filter to storage.
  service.addFilter = function (key, value) {
  	console.log(key, value);
    service.filters.push([key, value]);
  };

  // Remove filter from storage.
  service.removeFilter = function (item) {
    var i = service.filters.indexOf(item);
    if (i > -1) { service.filters.splice(i); }
  };

  // Remove all filters from storage.
  service.clearAllFilters = function () {
    service.filters = [];
  };

  // Runs on filter loop, returns true if the item matches all of the filter
  // criteria.
  service.returnFilterTruthy = function (item) {
    
    var truth = true;

    angular.forEach(service.filters, function (f) {
      var key = f[0],
          value = f[1];

      if (item.hasOwnProperty(key)) {

        var check = item[key];

        // Array check.
        if (_.isArray(check) && !_.contains(check, value)) {
          truth = false;
        }

        // String check.
        if (_.isString(check) && check !== value) {
          truth = false;
        }

      }
    });

    return truth;
  };

  return service;

}])

;