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Javascript notes

Just some notes on some popular javascript libraries.

bootstrap-daterangepicker

How to get startDate and endDate

var range = $("#range").daterangepicker();
var start = range.data("daterangepicker").startDate;
var end = range.data("daterangepicker").endDate;

lodash

map

var data = [
  { label: "4/1", value: 10 },
  { label: "4/2", value: 14 },
];
var labels = _.map(data, function (item) {
  return item.label;
});
var values = _.map(data, function (item) {
  return item.value;
});

It is especially useful when preparing data for some chart libraries.

convert array to object

var data = [
  { value: 0, name: "Working" },
  { value: 1, name: "Idle" },
];
var result = _.chain(data).keyBy("value").mapValues("name").value();
//The result will be {0: 'Working', 1: 'Idle'}

jquery

How to pass array when using $.get

$.get("/api", { "name[]": ["George", "Jacky"] }, function (data) {});

If you are using Spring MVC for the server side, here is the relative code to receive multiple parameters.

     @GetMapping("/api")
     @ResponseBody
     public YourResponseEntity api(@RequestParam("name") String[] names) {
     //deal with names
     }

es6

How to get keys of an object in javascript

const data = { name: "sting", age: 10 };
Object.keys(data);