Open a popup box after receiving result from ajax

i have a ajax code that works properly and gives the desired result. I want to modify this code and want that when a reply is received from ajax a popup/modal box should get opened.

I am able to open popup/modal box on a click of a button

<!-- Button trigger modal -->
<button class="btn btn-primary" data-toggle="modal" data-target="#bsModal3">
    Small Modal
</button>

<!-- Modal -->
<div class="modal fade" id="bsModal3" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
    <div class="modal-dialog modal-sm">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                <h4 class="modal-title" id="mySmallModalLabel">Modal title</h4>
            </div>
            <div class="modal-body">
                Your content goes here...
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                <button type="button" class="btn btn-primary">Save changes</button>
            </div>
        </div>
    </div>
</div>

but don’t know how to open it automatically within ajax.

here is my ajax code

$.ajax({
    type: 'post',
    url: 'test2.php',
    dataType: 'json',
    data: {
        txt: txtbox,
        hidden: hiddenTxt
    },
    cache: false,
    success: function (returndata) {
        if (returndata[4] === 1) {
            // want to load a popup box here
        } else {
            // other code
        }
    },
    error: function () {
        console.error('Failed to process ajax !');
    }
});

can anyone please tell me how it can be done

Answer

You can use $("#bsModal3").modal('show'); inside your result.

See more about modal methods

$.ajax({
  type: 'post',
  url: 'test2.php',
  dataType: 'json',
  data: {
    txt: txtbox,
    hidden: hiddenTxt
  },
  cache: false,
  success: function(returndata) {
    if (returndata[4] === 1) {

      $("#bsModal3").modal('show');

    } else {
      // other code
    }
  },
  error: function() {
    console.error('Failed to process ajax !');
  }
});

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>




<!-- Modal -->
<div class="modal fade" id="bsModal3" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
  <div class="modal-dialog modal-sm">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
        <h4 class="modal-title" id="mySmallModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
        Your content goes here...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>