Vanilla JS SlideDown/Up

Hey Guys,

For the past years i've been working with JQuery alot, because it allow do things really fast and has full support in most browsers.

Although it is a lightweight library, it may be too much for what we want to achieve.

Couple days ago i published a way of doing FadeIn/Out in pure javascript, this time, im going to show how to make SlideDown/Up.

Let's get started.


    /* SLIDE UP */
    let slideUp = (target, duration=500) => {

        target.style.transitionProperty = 'height, margin, padding';
        target.style.transitionDuration = duration + 'ms';
        target.style.boxSizing = 'border-box';
        target.style.height = target.offsetHeight + 'px';
        target.offsetHeight;
        target.style.overflow = 'hidden';
        target.style.height = 0;
        target.style.paddingTop = 0;
        target.style.paddingBottom = 0;
        target.style.marginTop = 0;
        target.style.marginBottom = 0;
        window.setTimeout( () => {
              target.style.display = 'none';
              target.style.removeProperty('height');
              target.style.removeProperty('padding-top');
              target.style.removeProperty('padding-bottom');
              target.style.removeProperty('margin-top');
              target.style.removeProperty('margin-bottom');
              target.style.removeProperty('overflow');
              target.style.removeProperty('transition-duration');
              target.style.removeProperty('transition-property');
              //alert("!");
        }, duration);
    }

    /* SLIDE DOWN */
    let slideDown = (target, duration=500) => {

        target.style.removeProperty('display');
        let display = window.getComputedStyle(target).display;
        if (display === 'none') display = 'block';
        target.style.display = display;
        let height = target.offsetHeight;
        target.style.overflow = 'hidden';
        target.style.height = 0;
        target.style.paddingTop = 0;
        target.style.paddingBottom = 0;
        target.style.marginTop = 0;
        target.style.marginBottom = 0;
        target.offsetHeight;
        target.style.boxSizing = 'border-box';
        target.style.transitionProperty = "height, margin, padding";
        target.style.transitionDuration = duration + 'ms';
        target.style.height = height + 'px';
        target.style.removeProperty('padding-top');
        target.style.removeProperty('padding-bottom');
        target.style.removeProperty('margin-top');
        target.style.removeProperty('margin-bottom');
        window.setTimeout( () => {
          target.style.removeProperty('height');
          target.style.removeProperty('overflow');
          target.style.removeProperty('transition-duration');
          target.style.removeProperty('transition-property');
        }, duration);
    }

    /* TOOGLE */
    var slideToggle = (target, duration = 500) => {
        if (window.getComputedStyle(target).display === 'none') {
          return slideDown(target, duration);
        } else {
          return slideUp(target, duration);
        }
    }

That's it, now you can use it like this:


// Specify Element and Duration (milliseconds)
slideUp(document.getElementById("target"), 1000);

slideDown(document.getElementById("target"), 1000);

slideToggle(document.getElementById("target"), 1000);

I found this code online a few days ago and it works well, I hope it helps someone.

Take a look at my most recent project: VanillaJS Fully Customizable SelectBoxes

Thank you.

Blog

Vanilla JS SlideDown/Up

Bruno Vieira

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