html – Bootstrap Modal setting id using jquery not working-ThrowExceptions

Exception or error:

I’m creating some modals as follow:

<button type="button" class="btn btn-primary student" data-toggle="modal" data-target="#myModal" data-id={{item.st_number}}>
  Open modal
</button>

<!-- The Modal -->
<div class="modal" id="myModal">
  <div class="modal-dialog">
    <div class="modal-content">

      <!-- Modal Header -->
      <div class="modal-header">
        <h4 class="modal-title">Modal Heading</h4>
        <button type="button" class="close" data-dismiss="modal">&times;</button>
      </div>

      <!-- Modal body -->
      <div class="modal-body">
        Modal body..
      </div>

      <!-- Modal footer -->
      <div class="modal-footer">
        <button type="button" class="btn btn-danger" data-dismiss="modal">Close</button>
      </div>

    </div>
  </div>
</div>

I want to change modal ids to button data-id field with the following script:

    $(document).on("click", ".student", function() {
        var stid = $(this).data('id');
        $(".modal-header h5").html(stid);
        $(this).find('.myModal').text(stid);
    });

changing modal header works, but modal name is not changed.

How to solve:

You can’t use find() like that because .find() method allows us to search through the descendants of these elements in the DOM tree . Use next() with find() to get element and change text.

$(document).on("click", ".student", function() {
  var stid = $(this).data('id');
  $(this).next('div').find(".modal-header h4").text(stid);
  $(this).next('div.modal').attr('id', stid);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button type="button" class="btn btn-primary student" data-toggle="modal" data-target="#myModal" data-id={{item.st_number}}>
  Open modal
</button>

<!-- The Modal -->
<div class="modal" id="myModal">
  <div class="modal-dialog">
    <div class="modal-content">

      <!-- Modal Header -->
      <div class="modal-header">
        <h4 class="modal-title">Modal Heading</h4>
        <button type="button" class="close" data-dismiss="modal">&times;</button>
      </div>

      <!-- Modal body -->
      <div class="modal-body">
        Modal body..
      </div>

      <!-- Modal footer -->
      <div class="modal-footer">
        <button type="button" class="btn btn-danger" data-dismiss="modal">Close</button>
      </div>

    </div>
  </div>
</div>

###

your jQuery is wrong. there are not any h5 tag in HTML within .modal-header class.

you can try this

$(document).on("click", ".student", function() {
        var stid = $(this).data('id');
        $(".modal-header h4").text(stid);
    });

###

The below script xhanges you modal ID as well, try it:

$(document).on("click", ".student", function() {
    var stid = $(this).data('id');
    $(".modal-header h4").html(stid);
    $('.modal').attr('id', 'desired_id');
});

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