bootstrap page loader example

Example 1: how to add loader in bootstrap

<div class="spinner-border text-primary" 
    id="spinner"role="status">
    <span class="sr-only">Loading...</span>
</div>

Example 2: bootstrap loader

<button class="btn btn-primary" type="button" disabled>
  <span class="spinner-grow spinner-grow-sm" role="status" aria-hidden="true"></span>
  <span class="sr-only">Loading...</span>
</button>
<button class="btn btn-primary" type="button" disabled>
  <span class="spinner-grow spinner-grow-sm" role="status" aria-hidden="true"></span>
  Loading...
</button>