Example Filterable Collection

filterablecollection.js

    
// Collection of filter functions
filters: new Backbone.Collection(),
// Temporary collection used to apply the filters to
tempCollection: new Backbone.Collection(),

 // Filter function for sub string in property
stringInPropertyFilterFunction: function (prop, str) {
    return function (model) {
        var lowerCaseProp = model.get(prop).toLowerCase();
        return lowerCaseProp.indexOf(str.toLowerCase()) !== -1;
    };
},

 // Adds a filter function to the filters collection to be applied later
addFilter: function (obj) {
    this.filters.add(obj);
    return this.applyFilters();
},

// Applies all the existing filters to the data set and returns the results
applyFilters: function() {
    var self = this,
        tempCollection = this.tempCollection.reset(self.toJSON());

    self.filters.each(function(filterModel) {
        var filterFunction = self[filterModel.get('filterFunction')],
            args = filterModel.get('args') || [];
        if (filterFunction) {
            tempCollection.reset(tempCollection.filter(filterFunction.apply(self, args)), {
                'silent': true
            });
        }
    });

    return tempCollection.toJSON();
}