Backbone.Collection CSV exporter. Client side

CsvExporter.js

class CsvExporter {
    constructor (collection, options) {
	this.collection = collection;
        this.options = {
	 format : false,
         titles : false
        };
        _.extend(this.options, options || {});
    }

    getContent() {
        var csv = ""; 
        var keys = this.options.format || _.chain(this.collection.first().attributes).keys().sort().value();

	if( this.options.titles ) {
           csv += keys.join(',')+'\n'
        }

	csv += this.collection.map(function(item) { 
	  var cols = []
	  _.each(keys, function(key) { cols.push(item.get(key)) }) 
	  return cols.join(',') 
	}).join('\n');

        return csv;
    }

    save(fileName) {
       var header = "data:text/csv;charset=utf-8,";
       var encodedUri = encodeURI(header + this.getContent());
       var link = document.createElement("a");
       link.setAttribute("href", encodedUri);
       link.setAttribute("download", fileName);
       document.body.appendChild(link); 
       link.click();
    }
}

// TEST
var ct = new Backbone.Collection([
	{ name : "dasda" , value : 3, a : 231 },
	{ name : "ghfgh" , value : 4, a : 432 },
	{ name : "fsdfs" , value : 5, a : 666 },
	{ name : "gdfgdf" , value : 8, a : 444 }
]);

var expoter = new CsvExporter(ct, {
   format : [ "name", "value" ]
});
console.log(expoter.getContent());
console.log(expoter.save("test.csv"));