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HTML

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <h1 class="text-center">Turn classic bootstrap modal into loading popup <small>WHY? Because bootstrap is freakin awesome!</small></h1>
<div class="row">
  <div class="col-sm-6">
    <div class="button-wrap">
      <!-- Button trigger modal -->
      <button type="button" class="btn btn-default btn-lg btn-block" id="just_load_please">
    Open loading modal<br>
    <small>This function can also be triggered through jquery event listener or inside a juqery function</small>
  </button>
    </div>
  </div>
  <div class="col-sm-6">
    <div class="button-wrap">
      <button type="button" class="btn btn-default btn-lg btn-block" id="load_me_baby">
    Get API response<br>
    <small>(open modal containing loading animation -> submit ajax post -> receive response -> hide loading modal)</small>
  </button>
    </div>


    <div id="output" class="text-center">
      <p class="subtle">Ajax response will load here...</p>
    </div>
  </div>
</div>
<!-- Modal -->
<div class="modal fade" id="loadMe" tabindex="-1" role="dialog" aria-labelledby="loadMeLabel">
  <div class="modal-dialog modal-sm" role="document">
    <div class="modal-content">
      <div class="modal-body text-center">
        <div class="loader"></div>
        <div clas="loader-txt">
          <p>Check out this slick bootstrap spinner modal. <br><br><small>We are addicted to Bootstrap... #love</small></p>
        </div>
      </div>
    </div>
  </div>
</div>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Roboto:300,400);
body {
  height: 100%;
  padding: 0px;
  margin: 0px;
  background: #333;
  font-family: 'Roboto', sans-serif !important;
  font-size: 1em;
}
h1{
  font-family: 'Roboto', sans-serif;
  font-size: 30px;
  color: #999;
  font-weight: 300;
  margin-bottom: 55px;
  margin-top: 45px;
  text-transform: uppercase;
}
h1 small{
  display: block;
  font-size: 18px;
  text-transform: none;
  letter-spacing: 1.5px;
  margin-top: 12px;
}
.row{
  max-width: 950px;
  margin: 0 auto;
}
.btn{
  white-space: normal;
}
.button-wrap {
  position: relative;
  text-align: center;
  .btn {
    font-family: 'Roboto', sans-serif;
    box-shadow: 0 0 15px 5px rgba(0, 0, 0, 0.5);
    border-radius: 0px;
    border-color: #222;
    cursor: pointer;
    text-transform: uppercase;
    font-size: 1.1em;
    font-weight: 400;
    letter-spacing: 1px;
    small {
      font-size: 0.8rem;
      letter-spacing: normal;
      text-transform: none;
    }
  }
}


/** SPINNER CREATION **/

.loader {
  position: relative;
  text-align: center;
  margin: 15px auto 35px auto;
  z-index: 9999;
  display: block;
  width: 80px;
  height: 80px;
  border: 10px solid rgba(0, 0, 0, .3);
  border-radius: 50%;
  border-top-color: #000;
  animation: spin 1s ease-in-out infinite;
  -webkit-animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to {
    -webkit-transform: rotate(360deg);
  }
}

@-webkit-keyframes spin {
  to {
    -webkit-transform: rotate(360deg);
  }
}


/** MODAL STYLING **/

.modal-content {
  border-radius: 0px;
  box-shadow: 0 0 20px 8px rgba(0, 0, 0, 0.7);
}

.modal-backdrop.show {
  opacity: 0.75;
}

.loader-txt {
  p {
    font-size: 13px;
    color: #666;
    small {
      font-size: 11.5px;
      color: #999;
    }
  }
}

#output {
  padding: 25px 15px;
  background: #222;
  border: 1px solid #222;
  max-width: 350px;
  margin: 35px auto;
  font-family: 'Roboto', sans-serif !important;
  p.subtle {
    color: #555;
    font-style: italic;
    font-family: 'Roboto', sans-serif !important;
  }
  h4 {
    font-weight: 300 !important;
    font-size: 1.1em;
    font-family: 'Roboto', sans-serif !important;
  }
  p {
    font-family: 'Roboto', sans-serif !important;
    font-size: 0.9em;
    b {
      text-transform: uppercase;
      text-decoration: underline;
    }
  }
}
!

JS 

              
                $(document).ready(function() {
  $("#just_load_please").on("click", function(e) {
    e.preventDefault();
    $("#loadMe").modal({
      backdrop: "static", //remove ability to close modal with click
      keyboard: false, //remove option to close with keyboard
      show: true //Display loader!
    });
    setTimeout(function() {
      $("#loadMe").modal("hide");
    }, 3500);
  });
  //ajax code here (example for $.post) using test page from https://reqres.in
  //Adding a delay so we can see the functionality of the loader while request processes
  $("#load_me_baby").on("click", function(e) {
    e.preventDefault();
    $("#loadMe").modal({
      backdrop: "static", //remove ability to close modal with click
      keyboard: false, //remove option to close with keyboard
      show: true //Display loader!
    });
    var testUrl = "https://reqres.in/api/users?delay=3";
    $.get(
      testUrl,
      function(response) {
        if (response.data[0]) {
          //if you received a successful return, remove the modal. Either way remove the modal!!
          var resOutput =
            '<h4 style="color: white">Modal closed and output displayed!</h4><p style="color: white">This is <b>' +
            response.data[0].first_name +
            " " +
            response.data[0].last_name +
            '</b></p><img src="' +
            response.data[0].avatar +
            '" class="img-responsive img-thumbnail" alt="avatar" style="margin-top: 13px; max-width="200px;">';
          $("#output").html(resOutput);
          $("#loadMe").modal("hide");
        } else {
          $("#output").html(
            '<div class="alert alert-warning"><h4>Uh oh!</h4></div>'
          );
        }
      },
      "json"
    );
  });
});
!
999px

Console