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Last active September 29, 2018 12:32
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JS Snippets

JS Snippets

Compatibility table

http://kangax.github.io/compat-table/es6/

Create, read, remove cookie

function createCookie(name, value, days) {
    if (days) {
	var date = new Date();
	date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
	var expires = "; expires=" + date.toGMTString();
    }
    else var expires = "";               

    document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for (var i = 0; i < ca.length; i++) {
	var c = ca[i];
	while (c.charAt(0) == ' ') c = c.substring(1, c.length);
	if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
    return null;
}

function eraseCookie(name) {
    createCookie(name, "", -1);
}

Save content to file

var sUriContent = "data:application/octet-stream," + encodeURIComponent(sContent);
// data:text/plain;charset=utf-8, - for text
window.open(sUriContent);
// OR location.href = sUriContent;

Object.assign analog, merge objects

function mergeObjects(oTarget) {
  var oResult = {};

  for (var sKey in oTarget) {
    if (oTarget.hasOwnProperty(sKey)) {
      oResult[sKey] = oTarget[sKey];
    }
  }
      
  for (var iIndex = 1; iIndex < arguments.length; iIndex++) {
    var oSource = arguments[iIndex];
    for (var sKey in oSource) {
      if (oSource.hasOwnProperty(sKey)) {
        oResult[sKey] = oSource[sKey];
      }
    }
  }
  return oResult;
}

Parse URL parameters

function fnGetUrlParams(sURL) 
{
  var aHashes = sURL.slice(sURL.indexOf('?') + 1).split('&');
  return aHashes
    .reduce(
      function(oParameters, sHash)
      {
        var [sKey, sValue] = sHash.split('=');
        return Object.assign(oParameters, {[sKey]: decodeURIComponent(sValue)})
      }, 
      {}
    );
}

function fnSetUrlParams(sURL, oParameters, bUpdate) 
{
  var sBaseURL = sURL.split('?')[0];

  var oNewParameters = {};

  if (bUpdate) {
    var oBaseParameters = fnGetUrlParams(sURL);
    oNewParameters = Object.assign(oBaseParameters, oParameters);
  } else {
    oNewParameters = oParameters;
  }

  var aParameters = [];

  for (var sKey in oNewParameters) {
    aParameters.push(sKey+'='+oNewParameters[sKey]);
  }

  return sBaseURL+'?'+aParameters.join('&');
}

Trigger html event

function trigger(sEventName)
{
  if ("createEvent" in document) {
    var oEvent = document.createEvent("HTMLEvents");
    oEvent.initEvent(sEventName, false, true);
    oElement.dispatchEvent(oEvent);
  }
  else
    oElement.fireEvent("on"+sEventName);
}

Timestamp in seconds

Math.round(new Date().getTime()/1000.0); // getTime () returns time in milliseconds.

Date with format dd.mm.YYYY

(new Date()).toLocaleString('ru-RU', { day: 'numeric', month: 'numeric', year: 'numeric' });
// Or
new Intl.DateTimeFormat('ru').format(new Date());

Format date

Got from http://blog.stevenlevithan.com/archives/date-time-format

/*
 * Date Format 1.2.3
 * (c) 2007-2009 Steven Levithan <stevenlevithan.com>
 * MIT license
 *
 * Includes enhancements by Scott Trenda <scott.trenda.net>
 * and Kris Kowal <cixar.com/~kris.kowal/>
 *
 * Accepts a date, a mask, or a date and a mask.
 * Returns a formatted version of the given date.
 * The date defaults to the current date/time.
 * The mask defaults to dateFormat.masks.default.
 */

var dateFormat = function () {
	var	token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
		timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
		timezoneClip = /[^-+\dA-Z]/g,
		pad = function (val, len) {
			val = String(val);
			len = len || 2;
			while (val.length < len) val = "0" + val;
			return val;
		};

	// Regexes and supporting functions are cached through closure
	return function (date, mask, utc) {
		var dF = dateFormat;

		// You can't provide utc if you skip other args (use the "UTC:" mask prefix)
		if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {
			mask = date;
			date = undefined;
		}

		// Passing date through Date applies Date.parse, if necessary
		date = date ? new Date(date) : new Date;
		if (isNaN(date)) throw SyntaxError("invalid date");

		mask = String(dF.masks[mask] || mask || dF.masks["default"]);

		// Allow setting the utc argument via the mask
		if (mask.slice(0, 4) == "UTC:") {
			mask = mask.slice(4);
			utc = true;
		}

		var	_ = utc ? "getUTC" : "get",
			d = date[_ + "Date"](),
			D = date[_ + "Day"](),
			m = date[_ + "Month"](),
			y = date[_ + "FullYear"](),
			H = date[_ + "Hours"](),
			M = date[_ + "Minutes"](),
			s = date[_ + "Seconds"](),
			L = date[_ + "Milliseconds"](),
			o = utc ? 0 : date.getTimezoneOffset(),
			flags = {
				d:    d,
				dd:   pad(d),
				ddd:  dF.i18n.dayNames[D],
				dddd: dF.i18n.dayNames[D + 7],
				m:    m + 1,
				mm:   pad(m + 1),
				mmm:  dF.i18n.monthNames[m],
				mmmm: dF.i18n.monthNames[m + 12],
				yy:   String(y).slice(2),
				yyyy: y,
				h:    H % 12 || 12,
				hh:   pad(H % 12 || 12),
				H:    H,
				HH:   pad(H),
				M:    M,
				MM:   pad(M),
				s:    s,
				ss:   pad(s),
				l:    pad(L, 3),
				L:    pad(L > 99 ? Math.round(L / 10) : L),
				t:    H < 12 ? "a"  : "p",
				tt:   H < 12 ? "am" : "pm",
				T:    H < 12 ? "A"  : "P",
				TT:   H < 12 ? "AM" : "PM",
				Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
				o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
				S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
			};

		return mask.replace(token, function ($0) {
			return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
		});
	};
}();

// Some common format strings
dateFormat.masks = {
	"default":      "ddd mmm dd yyyy HH:MM:ss",
	shortDate:      "m/d/yy",
	mediumDate:     "mmm d, yyyy",
	longDate:       "mmmm d, yyyy",
	fullDate:       "dddd, mmmm d, yyyy",
	shortTime:      "h:MM TT",
	mediumTime:     "h:MM:ss TT",
	longTime:       "h:MM:ss TT Z",
	isoDate:        "yyyy-mm-dd",
	isoTime:        "HH:MM:ss",
	isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss",
	isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
};

// Internationalization strings
dateFormat.i18n = {
	dayNames: [
		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
		"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
	],
	monthNames: [
		"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
		"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
	]
};

// For convenience...
Date.prototype.format = function (mask, utc) {
	return dateFormat(this, mask, utc);
};
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