Setting max length in summernote

How can I apply a maxlength to Summernote? Applying a maxlength to the textarea does not work here.

https://github.com/summernote/summernote

$("#textareaid").summernote({
      toolbar:[
        ['style', ['style']],
        ['font', ['bold', 'italic', 'underline', 'superscript', 'subscript', 'strikethrough', 'clear']],
        ['fontname', ['fontname']],     
        ['fontsize', ['fontsize']], 
        ['color', ['color']],
        ['para', ['ul', 'ol', 'paragraph']],
        ['height', ['height']],
        ['table', ['table']],
        ['insert', ['link', 'picture', 'video', 'hr']],
        ['view', ['fullscreen', 'codeview']],
        ['help', ['help']]      
      ],                  
      height: 250,  
      focus: true 
});

$("#summernotediv").code("");           
$('.note-help-dialog .row-fluid >p').hide();    
$('.note-editable').css('overflow','auto'); 
$('.note-image-input').prev('h5').remove();
$('.note-image-input').remove();

Answer

you can make it with callback object and preventDefault function.

This sample is with 400 limit.

  function registerSummernote(element, placeholder, max, callbackMax) {
    $(element).summernote({
      toolbar: [
        ['style', ['bold', 'italic', 'underline', 'clear']]
      ],
      placeholder,
      callbacks: {
        onKeydown: function(e) {
          var t = e.currentTarget.innerText;
          if (t.length >= max) {
            //delete key
            if (e.keyCode != 8)
              e.preventDefault();
            // add other keys ...
          }
        },
        onKeyup: function(e) {
          var t = e.currentTarget.innerText;
          if (typeof callbackMax == 'function') {
            callbackMax(max - t.length);
          }
        },
        onPaste: function(e) {
          var t = e.currentTarget.innerText;
          var bufferText = ((e.originalEvent || e).clipboardData || window.clipboardData).getData('Text');
          e.preventDefault();
          var all = t + bufferText;
          document.execCommand('insertText', false, all.trim().substring(0, 400));
          if (typeof callbackMax == 'function') {
            callbackMax(max - t.length);
          }
        }
      }
    });
  }


$(function(){
  registerSummernote('.summernote', 'Leave a comment', 400, function(max) {
    $('#maxContentPost').text(max)
  });
});
    
<!-- include libraries(jQuery, bootstrap) -->
<link href="https://netdna.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.css" rel="stylesheet">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.js"></script>
<script src="https://netdna.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.js"></script>

<!-- include summernote css/js -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/summernote/0.8.9/summernote.css" rel="stylesheet">
<script src="https://cdnjs.cloudflare.com/ajax/libs/summernote/0.8.9/summernote.js"></script>

<div class="container">
  <div class="row">
    <div class="col-xs-12">
      <div class="summernote"></div>
    </div>
    <div class="col-xs-12 text-right">
      <span id="maxContentPost"></span>
    </div>
  </div>
</div>

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