Facet.js
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define(function(require) {
'use strict';
var _ = require('underscore');
var Backbone = require('backbone');
var Sort = require('./Sort');
var Util = require('./Util');
function wrapComparatorForAllBeforeAfter(comparator, doBefore, doAfter) {
if (!doBefore && !doAfter) {
return comparator;
}
return function beforeAfterComparator(a, b) {
if (doBefore) {
if (a === 'before') {
return -1;
} else if (b === 'before') {
return 1;
}
}
if (doAfter) {
if (a === 'after') {
return 1;
} else if (b === 'after') {
return -1;
}
}
return comparator.call(this, a, b);
};
}
var Facet = Backbone.Model.extend({
defaults: function defaults() {
return {
checkedKeys: [],
formName: null,
query: null,
suggestions: [],
};
},
initialize: function(data, options) {
this.set('all', true);
this.on('change:queryMax change:queryMin', function() {
this.set('hasQuery', this.get('queryMin') !== undefined && this.get('queryMax') !== undefined);
}, this);
(function(self) {
var skipCallback;
self.on('item-change change:queryMax change:queryMin', function() {
switch (skipCallback) {
case 'change:checkedKeys':
case 'change:all':
return;
}
var checkedKeys = [];
this.get('items').each(function(facetItem) {
if (facetItem.get('checked')) {
checkedKeys.push(facetItem.get('key'));
}
});
var checkedCount = checkedKeys.length;
if (this.get('queryMin') !== undefined && this.get('queryMax') !== undefined) {
checkedCount++;
}
skipCallback = 'item-change';
try {
this.set({
all: checkedCount === 0,
checkedKeys: checkedKeys,
});
} finally {
skipCallback = null;
}
}, self);
self.on('change:all', function() {
switch (skipCallback) {
case 'change:checkedKeys':
case 'item-change':
return;
}
skipCallback = 'change:all';
try {
this.get('items').invoke('set', {checked: false});
this.set({
checkedKeys: [],
queryMax: undefined,
queryMin: undefined,
});
} finally {
skipCallback = null;
}
}, self);
self.on('change:checkedKeys', function() {
switch (skipCallback) {
case 'item-change':
case 'change:all':
return;
}
var checkedKeys = {};
_.each(this.get('checkedKeys'), function(value, i) {
checkedKeys[value] = true;
});
skipCallback = 'change:checkedKeys';
var checkedCount = 0;
if (this.get('queryMin') !== undefined && this.get('queryMax') !== undefined) {
checkedCount++;
}
try {
this.get('items').each(function(facetItem) {
var newChecked = checkedKeys[facetItem.get('key')];
var currentChecked = facetItem.get('checked');
if (newChecked !== currentChecked) {
facetItem.set('checked', !!newChecked);
}
if (facetItem.get('checked')) {
checkedCount++;
}
});
this.set({
all: checkedCount === 0,
});
} finally {
skipCallback = null;
}
}, self);
})(this);
var sortKeyExtractor = options.sortKeyExtractor;
if (!sortKeyExtractor) {
sortKeyExtractor = Util.getItemKeyAccessor;
}
var formatter = options.formatter;
if (!formatter) {
var labelMap = options.labelMap;
if (labelMap) {
formatter = function(item) {
var value = item.get('key');
var label = options.labelMap[value.toUpperCase()];
return label ? label : value;
};
} else {
formatter = Util.getItemKeyAccessor;
}
}
this.formatter = formatter;
this.on('change:comparator change:orderByDirection', function() {
var comparator = this.get('comparator');
if (!comparator) {
comparator = Sort.standard;
} else if (typeof comparator === 'string') {
comparator = Sort[comparator];
}
switch (options.facetType) {
case 'year':
case 'range':
case 'interval':
comparator = wrapComparatorForAllBeforeAfter(comparator, ['all', 'before'].indexOf(options.other) !== -1, ['all', 'after'].indexOf(options.other) !== -1);
break;
}
var facet = this;
comparator = (function(comparator) {
return function facetItemValue(a, b) {
var keyA = sortKeyExtractor(a);
var keyB = sortKeyExtractor(b);
switch (facet.get('orderByDirection')) {
case 'desc':
var tmp = keyA;
keyA = keyB;
keyB = tmp;
break;
}
return comparator.call(facet, keyA, keyB);
};
})(comparator);
var items = this.get('items');
items.comparator = comparator;
items.sort();
}, this);
this.set('items', new ItemCollection([]));
this.set('comparator', options.comparator, {silent: true});
this.trigger('change:comparator');
this.get('items').on('item-change', function() {
this.trigger('item-change');
}, this);
this.facetType = options.facetType;
this.facetStats = options.facetStats;
this.other = options.other;
this.facetField = options.facetField;
this.queryField = options.queryField;
this.queryValue = options.queryValue;
this.bins = options.bins;
switch (this.facetType) {
case 'year':
this.rangeStart = options.start;
this.rangeEnd = options.end;
this.rangeGap = '+' + (options.gap ? options.gap : 1) + 'YEAR';
break;
case 'range':
this.rangeStart = options.start;
this.rangeEnd = options.end;
this.rangeGap = options.gap;
break;
case 'field':
case 'year-field':
case 'interval':
break;
default:
var e = new Error('Unsupported facet type: ' + this.facetType);
e.facet = this;
throw e;
}
return Facet.__super__.initialize.apply(this, arguments);
},
/*
toJSON: function toJSON(options) {
if (!!options.facetSuggestions) {
return {
rows: 0,
facet: true,
wt: 'json',
q: '*:*',
'facet.contains': this.get('query'),
'facet.contains.ignoreCase': true,
'facet.field': this.queryField,
'facet.mincount': 1,
};
}
},
parse: function parse(data, options) {
if (!!options.facetSuggestions) {
var suggestions = [];
var key;
_.each(data.facet_counts.facet_fields[this.queryField], function(value, index) {
if (index % 2 === 0) {
key = value;
} else if (value > 0) {
suggestions.push({key: key, value: value});
}
});
return {
suggestions: suggestions,
};
}
return null;
},
*/
});
var ItemCollection = Backbone.Collection.extend({
remove: function() {
}
});
var Item = Facet.Item = Backbone.Model.extend({
idAttribute: 'key',
defaults: {
checked: false,
hidden: false,
},
initialize: function(data, options) {
this.on('add', function(model, parent, options) {
// added to a collection
this.on('change:checked', function() {
parent.trigger('item-change');
});
}, this);
return Item.__super__.initialize.apply(this, arguments);
}
});
return Facet;
});