jquery count li elements inside ul -> length?

Question

If a ul has more than one li-element inside of it, something should happen, otherwise not!

What am I doing wrong?

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Answer 1

If you have a dom object of the ul, use the following.

$('#my_ul').children().length;

A simple example

window.setInterval(function() {
  let ul = $('#ul');                 // Get the ul
  let length = ul.children().length; // Count of the child nodes.

  // The show!
  ul.append('
Item ' + (length + 1) + '
');
  if (5 <= length) {
    ul.empty();
    length = -1;
  }
  $('#ul_length').text(length + 1);
}, 1000);

Count of the child nodes: 0