JSFiddle - React, Tailwind, and code Playground

by arawn45

HTML

<div class='resizable'>
  <div class='resizers'>
    
    <div class='resizer top-right'></div>

  </div>
</div>
<br>
<div class='resizable'>
  <div class='resizers'>
    
    <div class='resizer top-right'></div>

  </div>
</div>
<br>
<div class='resizable'>
  <div class='resizers'>
    
    <div class='resizer top-right'></div>

  </div>
</div>

CSS

body,
html {
  background: black;
}
.resizable {
  background: white;
  width: 100px;
  height: 100px;
  position: relative;
  top: 100px;
  left: 100px;
}

.resizable .resizers{
  width: 100%;
  height: 100%;
  border: 3px solid #4286f4;
  box-sizing: border-box;
}

.resizable .resizers .resizer{
  width: 5px;
  height: 100%;

  position: absolute;
}


.resizable .resizers .resizer.top-right {
  right: -1px;
  top: -1px;
  cursor: ew-resize;
}

JavaScript

/*Make resizable div by Hung Nguyen*/
function makeResizableDiv(div) {
  const element = document.querySelector(div);
  const resizers = document.querySelectorAll(div + ' .resizer')
  const minimum_size = 20;
  let original_width = 0;
  let original_height = 0;
  let original_x = 0;
  let original_y = 0;
  let original_mouse_x = 0;
  let original_mouse_y = 0;
  for (let i = 0;i < resizers.length; i++) {
    const currentResizer = resizers[i];
    currentResizer.addEventListener('mousedown', function(e) {
      e.preventDefault()
      original_width = parseFloat(getComputedStyle(element, null).getPropertyValue('width').replace('px', ''));
      //original_height = parseFloat(getComputedStyle(element, null).getPropertyValue('height').replace('px', ''));
      original_x = element.getBoundingClientRect().left;
      original_y = element.getBoundingClientRect().top;
      original_mouse_x = e.pageX;
      original_mouse_y = e.pageY;
      window.addEventListener('mousemove', resize)
      window.addEventListener('mouseup', stopResize)
    })
    
    function resize(e) {
      if (currentResizer.classList.contains('bottom-right')) {
        const width = original_width + (e.pageX - original_mouse_x);
        const height = original_height + Math.round((e.pageY - original_mouse_y)/20)*20
        if (width > minimum_size) {
          element.style.width = width + 'px'
        }
        if (height > minimum_size) {
          //element.style.height = height + 'px'
        }
      }
      else if (currentResizer.classList.contains('bottom-left')) {
        const height = original_height + (e.pageY - original_mouse_y)
        const width = original_width - (e.pageX - original_mouse_x)
        if (height > minimum_size) {
          //element.style.height = height + 'px'
        }
        if (width > minimum_size) {
          element.style.width = width + 'px'
          element.style.left = original_x + (e.pageX - original_mouse_x) + 'px'
        }
      }
      else if...