How does stackoverflow make its Tag input field? [closed]

Answer 1

var es = document.querySelectorAll('.input-categories');
for (var i = 0; i < es.length; i++) {
  es[i]._list = es[i].querySelector('ul');
  es[i]._input = es[i].querySelector('input');
  es[i]._input._icategories = es[i];
  es[i].onkeydown = function(e){
    var e = event || e;
    if(e.keyCode == 13) {
      var c = e.target._icategories;
      var li = document.createElement('li');
      li.innerHTML = c._input.value;
      c._list.appendChild(li);
      c._input.value = '';
      e.preventDefault();
    }
  }
}

*{
  margin: 0px;
  padding: 0px;
}

.input-categories{
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  border: 1px solid black;
}

.input-categories ul{
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  list-style-type: none;
  flex-wrap: wrap;
}

.input-categories li{
  border: 1px solid black;
  border-radius: 2px;
  padding: 1px;
  margin: 1px;
}
.input-categories input{
  flex: 1 1 auto;
  align-self: flex-start;
}

  

    
moscow
    
new york
  
  



  

    
CSS
    
PHP