JSFiddle - React, Tailwind, and code Playground

by Paul Leech

HTML

<ul id="list">
<li id="element1">One</li>
<li id="element2">Two</li>
<li id="element3">Three</li>
</ul> 

<div class="btn" onClick="addAnother()"> Add Eelement </div>

CSS

.btn {
    width: 100px;
    height: 25px;
    background: red;
    color: white;
    text-align: center;
    line-height: 25px;
}

ul#list {
    list-style: none;
    width: 400px;
}

ul#list > li {
    width: 100%;
    height: 20px;
    background: green;
    margin-bottom: 3px;
    color: white;
    text-align: center;
    line-height: 20px;
}

JavaScript

addAnother = function() {
    var ul = document.getElementById("list");
    var li = document.createElement("li");
    var children = ul.children.length + 1
    li.setAttribute("id", "element"+children)
    li.appendChild(document.createTextNode("Four "+children));
    ul.appendChild(li)
}