Vanilla Javascript .fadein() .fadeOut() without JQuery [closed]

Question

I am developing for IE10+ so i decided not to use JQuery. I write custom javascript function to Select, Fadein, FadeOut etc and it is working fine. but i like to use the Function in JQuery Style (Object.fadeIn(), Object.FadeOut() etc).

Instead of JQuery Selector i use this.

function _(el){
    return document.getElementById(el);
}

When i need to select a Dom object i use this.

var myButton = _("button");

When i need to fadeIn Or fadeOut any object i use this.

function fade(type, ms, el) {
  var isIn = type === 'in',
    opacity = isIn ? 0 : 1,
    interval = 50,
    duration = ms,
    gap = interval / duration;

  if(isIn) {
    el.style.display = 'inline';
    el.style.opacity = opacity;
  }

  function func() {
    opacity = isIn ? opacity + gap : opacity - gap;
    el.style.opacity = opacity;

    if(opacity <= 0) el.style.display = 'none'
    if(opacity <= 0 || opacity >= 1) window.clearInterval(fading);
  }

  var fading = window.setInterval(func, interval);

}

Here is the specific code to fade my button

fade('out', 500, myButton);

I like to use like this _( "myButton" ).fadeIn( 100 );

Update: The trick was to use prototype function for "-" to add additional functionality like fadein(), fadeOut() .

Answer 1

This will do the trick:

function _(el) {
  if (!(this instanceof _)) {
    return new _(el);
  }
  this.el = document.getElementById(el);
}

_.prototype.fade = function fade(type, ms) {
  var isIn = type === 'in',
    opacity = isIn ? 0 : 1,
    interval = 50,
    duration = ms,
    gap = interval / duration,
    self = this;

  if(isIn) {
    self.el.style.display = 'inline';
    self.el.style.opacity = opacity;
  }

  function func() {
    opacity = isIn ? opacity + gap : opacity - gap;
    self.el.style.opacity = opacity;

    if(opacity <= 0) self.el.style.display = 'none'
    if(opacity <= 0 || opacity >= 1) window.clearInterval(fading);
  }

  var fading = window.setInterval(func, interval);
}

_('myButton').fade('out', 500);

From here on out you can extend your _ object with any jQuery-like function.