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HTML

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <h1>SVG Animated Buttons</h1>
<h2>Animate with SVG baby!</h2>
<p>Doing the SVG line animation with variable size buttons could be hard, but with a little JS, you can use any size button and get the same effect without any math on your part. Because thinking is for losers.</p>
<div class="container">
  <p>
<button type="button" class="btn btn-svg">
  <svg class="btn_svg" version="1.1" viewBox="0 0 30 20" preserveAspectRatio="none">
    <rect class="btn_svg_shape" width="30" height="20"/>
  </svg>
  <span>This is a button</span>
</button>
  </p>
  
    <p>
<button type="button" class="btn btn-svg btn-big">
  <svg class="btn_svg" version="1.1" viewBox="0 0 30 20" preserveAspectRatio="none">
    <rect class="btn_svg_shape" width="30" height="20"/>
  </svg>
  <span>This is a button</span>
</button>
  </p>
  
    <p>
<button type="button" class="btn btn-svg btn-small">
  <svg class="btn_svg" version="1.1" viewBox="0 0 30 20" preserveAspectRatio="none">
    <rect class="btn_svg_shape" width="30" height="20"/>
  </svg>
  <span>This is a button</span>
</button>
  </p>
</div>
!

CSS 

              
                .btn {
  position: relative;
  overflow: hidden;
  background: none;
  padding: 1em;
  background-color: transparent;
  transition: background-color 250ms ease-in;
  font-size: 1.5rem;
  color: orange;
  .transition(background-color, color;);
  border: none;
  
  &.btn-small {
    font-size: 1rem;
  }
  &.btn-big {
    font-size: 2rem;
  }
  
  &:before {
    content: "";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    
    border: 1px solid orange;
    opacity: 1;
    .transition(opacity;);
  }
  
  > span {
    position: relative;
  }
  
  .btn_svg {
    position: absolute;
    top: 0;
    left: 0;
    
    width: 100%;
    height: 100%;
  }
  .btn_svg_shape {
    stroke: orange;
    stroke-width: 2px;
    stroke-linecap: round;
    fill: transparent;
    
  }
  
  &:hover {
    transition-delay: 250ms;
    background-color: fade(black, 40%);
    color: white;
    
    &:before {
      opacity: 0;
    }
    
    .btn_svg_shape {
      .transition(stroke-dasharray, stroke-dashoffset; 500ms;);
      stroke-dashoffset: 0 !important;
      animation: 500ms pencil ease-in forwards;
    }
  }
}

/* Stroke animation. Use ems to scale :) */
@keyframes pencil{
  0% {
    stroke-width: 0.5em;
  }
  75% {
    stroke-width: 0.25em;
  }
  100%{
    stroke-width: 0.1em;
  }
}

/* Transition mixin, cause lazy */
.transition(@properties, @duration: 250ms, @easing: ease-in-out, @delay: 0){
    transition-property: @properties;
    transition-duration: @duration;
    transition-timing-function: @easing;
    transition-delay: @delay;
}

/* W00t border-box */
* {
  box-sizing: border-box;
  &:after,
  &:before {
    box-sizing: border-box;
  }
}

/* Make things perty */
html {  height: 100%;}
body { font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; background-color: #0d0d0d; color: #fff; height: 100%; padding-top: 2em; text-align: center;}
h1, h2{ margin: 0; text-transform: uppercase;text-shadow: 0 0 0.5em black;}
h2 { font-weight: 300}
input { border: 1px solid #666; background: #333; color: #fff; padding: 0.5em; box-shadow: none; outline: none !important; margin: 1em  auto; text-align: center;}
a { color: orange; text-decoration: none; transition: color 250ms ease-in-out;}
a:hover { color: yellow;}
.container { display:block; margin: 2em 0;}
p {max-width: 40em; margin: 1em auto;}
!

JS 

              
                jQuery(document).ready(function(){
  
  $('.btn-svg').each(function(){
    var 
      $this = $(this),
      width = $this.outerWidth(),
      height = $this.outerHeight(),
      $svg = $this.find('svg'),
      $rect = $svg.find('rect'),
      totalPerimeter = width*2+height*2;
        
    $svg[0].setAttribute('viewBox', '0 0 '+width+' '+height);
    $rect.attr('width', width);
    $rect.attr('height', height);
    $rect.css({ 
      strokeDashoffset: totalPerimeter,
      strokeDasharray: totalPerimeter
    });
  });
  
});
!
999px

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