BS v4: Add CSS Toggle Switch?

[kkirsche]

Hey,

Would it be of any interest in version four to do a pull request for a CSS only toggle switch? It would have animations and slide like you'd expect

Example image:

Essentially:

<label class="tgl">
  <input type="checkbox" checked/>
  <span class="tgl_body">
    <span class="tgl_switch"></span>
    <span class="tgl_track">
      <span class="tgl_bgd"></span>
      <span class="tgl_bgd tgl_bgd-negative"></span>
    </span>
  </span>
</label>

SCSS:

$toggle-height: 30px;
$toggle-width: 60px;
$switch-size: 30px;

$anim-slight-bounce: cubic-bezier(0.34,1.61,0.7,1);
$anim-speed-normal: 250ms;

$border-color: #dadde1;
$blue: #439fd8; // Guidebook blue

//   BASE
// -------------------------------------


.tgl {

  position: relative;
  display: inline-block;
  height: $toggle-height;
  cursor: pointer;

  > input {
    position: absolute;
    opacity: 0;
    z-index: -1; /* Put the input behind the label so it doesn't overlay text */
    visibility: hidden;
  }

  .tgl_body {
    width: $toggle-width;
    height: $toggle-height;
    background: white;
    border: 1px solid $border-color;
    display: inline-block;
    position: relative;
    border-radius: 50px;
  }

  .tgl_switch {
    width: $toggle-height;
    height: $toggle-height;
    display: inline-block;
    background-color: white;
    position: absolute;
    left: -1px;
    top: -1px;
    border-radius: 50%;
    border: 1px solid darken($border-color, 5%);
    @include box-shadow(0 2px 2px rgba(0,0,0,.13));
    @include transition(left $anim-slight-bounce $anim-speed-normal, transform $anim-slight-bounce $anim-speed-normal);
    z-index: 1;
  }

  .tgl_track {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    border-radius: 50px;
  }

  .tgl_bgd {
    position: absolute;
    right: -10px; // 10 compensates for animation bounce
    top: 0;
    bottom: 0;
    width: $toggle-width - ($switch-size / 2) + 10; // 10 compensates for animation bounce
    @include transition(left $anim-slight-bounce $anim-speed-normal, right $anim-slight-bounce $anim-speed-normal);
    background: $blue url('http://petelada.com/images/toggle/tgl_check.png') center center no-repeat;
  }

  .tgl_bgd-negative {
    right: auto;
    left: -($toggle-width - ($switch-size / 2));
    background: white url('http://petelada.com/images/toggle/tgl_x.png') center center no-repeat;
  }

  &:hover {
    .tgl_switch {
      border-color: darken($border-color, 13%);
      @include transform(scale(1.06));
    }
  }

  &:active {
    .tgl_switch {
      @include transform(scale(.95));
    }
  }

  > :not(:checked) ~ .tgl_body {

    > .tgl_switch {
      left: $toggle-width - $switch-size;
    }

    .tgl_bgd {
      right: -($toggle-width - ($switch-size / 2));

      &.tgl_bgd-negative {
        right: auto;
        left: -10px;
      }
    }
  }
}

[kkirsche]

Also could be a simpler one like:

HTML

<div class="switch">
  <input id="cmn-toggle-4" class="cmn-toggle cmn-toggle-round-flat" type="checkbox">
  <label for="cmn-toggle-4"></label>
</div>

CSS:

.cmn-toggle {
  position: absolute;
  margin-left: -9999px;
  visibility: hidden;
}
.cmn-toggle + label {
  display: block;
  position: relative;
  cursor: pointer;
  outline: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
input.cmn-toggle-round-flat + label {
  padding: 2px;
  width: 120px;
  height: 60px;
  background-color: #dddddd;
  -webkit-border-radius: 60px;
  -moz-border-radius: 60px;
  -ms-border-radius: 60px;
  -o-border-radius: 60px;
  border-radius: 60px;
  -webkit-transition: background 0.4s;
  -moz-transition: background 0.4s;
  -o-transition: background 0.4s;
  transition: background 0.4s;
}
input.cmn-toggle-round-flat + label:before, input.cmn-toggle-round-flat + label:after {
  display: block;
  position: absolute;
  content: "";
}
input.cmn-toggle-round-flat + label:before {
  top: 2px;
  left: 2px;
  bottom: 2px;
  right: 2px;
  background-color: #fff;
  -webkit-border-radius: 60px;
  -moz-border-radius: 60px;
  -ms-border-radius: 60px;
  -o-border-radius: 60px;
  border-radius: 60px;
  -webkit-transition: background 0.4s;
  -moz-transition: background 0.4s;
  -o-transition: background 0.4s;
  transition: background 0.4s;
}
input.cmn-toggle-round-flat + label:after {
  top: 4px;
  left: 4px;
  bottom: 4px;
  width: 52px;
  background-color: #dddddd;
  -webkit-border-radius: 52px;
  -moz-border-radius: 52px;
  -ms-border-radius: 52px;
  -o-border-radius: 52px;
  border-radius: 52px;
  -webkit-transition: margin 0.4s, background 0.4s;
  -moz-transition: margin 0.4s, background 0.4s;
  -o-transition: margin 0.4s, background 0.4s;
  transition: margin 0.4s, background 0.4s;
}
input.cmn-toggle-round-flat:checked + label {
  background-color: #8ce196;
}
input.cmn-toggle-round-flat:checked + label:after {
  margin-left: 60px;
  background-color: #8ce196;
}

Which results in:

[kkirsche]

First as a Pen:
http://codepen.io/kkirsche/pen/emyvPb

Second as a Pen:
http://codepen.io/kkirsche/pen/VYypVe

[cvrebert]

X-Ref: #1935

[cvrebert]

Might want to propose this for https://github.com/mdo/wtf-forms/ first.

[kkirsche]

Proposed for wtf-forms as an issue: mdo/wtf-forms#47

Thanks for the suggestion @cvrebert. I'll be happy to implement in either place or both based on feedback.

[mdo]

I'm probably in favor of it, but this exact proposal (the examples) are a little glitchy it looks like.

[kkirsche]

Sounds good. Let me know what glitches you run into and I'll be happy to attempt to revise them. Starting points if nothing else 👍

[DaSchTour]

Although I the example looks very nice I would like to note, that some designs based on bootstrap are flat and without rounded corners. I hope this will be considered in the final design of such a toggle/switch. Thanks

[mdo]

Punting on this—we're not leaving issues open for v4 until we do the alpha.

[paglias]

Do you plan to add this to Bootstrap 4?

[patrickhlauke]

no current plans for this, no

[kkirsche]

the more I've looked into this @paglias the more difficult it seems to ensure that it really works consistently across browsers while maintaining proper accessibility. I could just be missing something though of course

[paglias]

I understand, thanks anyway :)