antulik/pagelet_rails

<% height = pagelet_options.placeholder.try(:[], :height) %>
<% height = height.is_a?(Numeric) ? "#{height}px" : 'auto' %>
<% text = pagelet_options.placeholder.try(:[], :text) || 'Loading ...' %>

<style type="text/css">
  /* Three Bounce */
  .spinner.spinner-three-bounce {
    margin: auto;
    width: 70px;
    text-align: center;
  }

  .spinner-three-bounce > div {
    width: 16px;
    height: 16px;
    background-color: #3498db;

    border-radius: 100%;
    display: inline-block;
    -webkit-animation: bouncedelay 1.4s infinite ease-in-out;
    animation: bouncedelay 1.4s infinite ease-in-out;
    /* Prevent first frame from flickering when animation starts */
    -webkit-animation-fill-mode: both;
    animation-fill-mode: both;
  }

  .spinner-three-bounce .bounce1 {
    -webkit-animation-delay: -0.32s;
    animation-delay: -0.32s;
  }

  .spinner-three-bounce .bounce2 {
    -webkit-animation-delay: -0.16s;
    animation-delay: -0.16s;
  }

  @-webkit-keyframes bouncedelay {
    0%, 80%, 100% {
      -webkit-transform: scale(0.0)
    }
    40% {
      -webkit-transform: scale(1.0)
    }
  }

  @keyframes bouncedelay {
    0%, 80%, 100% {
      transform: scale(0.0);
      -webkit-transform: scale(0.0);
    }
    40% {
      transform: scale(1.0);
      -webkit-transform: scale(1.0);
    }
  }
</style>

<div style="display: table; height: <%= height %>; overflow: hidden; width: 100%;">
  <div style="display: table-cell; vertical-align: middle;">
    <div class="text-center">
      <div class="spinner spinner-three-bounce">
        <div class="bounce1"></div>
        <div class="bounce2"></div>
        <div class="bounce3"></div>
      </div>
      <br>
      <span>
        <%= text %>
      </span>
    </div>
  </div>
</div>