如何制作可调整大小的 div，从侧面调整大小？

Question

我有来自 codepen 的这段代码，它制作了一个可调整大小的 div，可以从角落调整大小：

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

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

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

.resizable .resizers .resizer{
  width: 10px;
  height: 10px;
  border-radius: 50%; /*magic to turn square into circle*/
  background: white;
  border: 3px solid #4286f4;
  position: absolute;
}

.resizable .resizers .resizer.top-left {
  left: -5px;
  top: -5px;
  cursor: nwse-resize; /*resizer cursor*/
}
.resizable .resizers .resizer.top-right {
  right: -5px;
  top: -5px;
  cursor: nesw-resize;
}
.resizable .resizers .resizer.bottom-left {
  left: -5px;
  bottom: -5px;
  cursor: nesw-resize;
}
.resizable .resizers .resizer.bottom-right {
  right: -5px;
  bottom: -5px;
  cursor: nwse-resize;
}

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 + (e.pageY - original_mouse_y)
        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 (currentResizer.classList.contains('top-right')) {
        const width = original_width + (e.pageX - original_mouse_x)
        const height = original_height - (e.pageY - original_mouse_y)
        if (width > minimum_size) {
          element.style.width = width + 'px'
        }
        if (height > minimum_size) {
          element.style.height = height + 'px'
          element.style.top = original_y + (e.pageY - original_mouse_y) + 'px'
        }
      }
      else {
        const width = original_width - (e.pageX - original_mouse_x)
        const height = original_height - (e.pageY - original_mouse_y)
        if (width > minimum_size) {
          element.style.width = width + 'px'
          element.style.left = original_x + (e.pageX - original_mouse_x) + 'px'
        }
        if (height > minimum_size) {
          element.style.height = height + 'px'
          element.style.top = original_y + (e.pageY - original_mouse_y) + 'px'
        }
      }
    }

    function stopResize() {
      window.removeEventListener('mousemove', resize)
    }
  }
}

makeResizableDiv('.resizable')

我如何使它从侧面调整大小？ 它应该在右侧、左侧、底部、右侧和顶部的中间有一个圆圈，并从那里调整大小。 这是原始笔的链接： Medium: Making a resizable div

可能需要四个新的 ifs 和四个新的 css 类，但我不确定。

Answer 1

我调整了定位和类标题以将手柄放在两侧，然后从每个允许调整两个方向的脚本中删除。

 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('right')) { const width = original_width + (e.pageX - original_mouse_x); if (width > minimum_size) { element.style.width = width + 'px' } } else if (currentResizer.classList.contains('left')) { const width = original_width - (e.pageX - original_mouse_x) if (width > minimum_size) { element.style.width = width + 'px' element.style.left = original_x + (e.pageX - original_mouse_x) + 'px' } } else if (currentResizer.classList.contains('top')) { const height = original_height - (e.pageY - original_mouse_y) if (height > minimum_size) { element.style.height = height + 'px' element.style.top = original_y + (e.pageY - original_mouse_y) + 'px' } } else if (currentResizer.classList.contains('bottom')) { const height = original_height + (e.pageY - original_mouse_y) if (height > minimum_size) { element.style.height = height + 'px' } } } function stopResize() { window.removeEventListener('mousemove', resize) } } } makeResizableDiv('.resizable')

 body, html { background: black; } .resizable { background: white; width: 100px; height: 100px; position: absolute; top: 100px; left: 100px; } .resizable .resizers{ width: 100%; height: 100%; border: 3px solid #4286f4; box-sizing: border-box; } .resizable .resizers .resizer{ width: 10px; height: 10px; border-radius: 50%; /*magic to turn square into circle*/ background: white; border: 3px solid #4286f4; position: absolute; } .resizer.top { left: 50%; top: -5px; cursor: ns-resize; transform: translate(-7px, 0px); } .resizer.right { right: -5px; bottom: 50%; cursor: ew-resize; transform: translate(0px, 5px); } .resizer.bottom { left: 50%; bottom: -5px; cursor: ns-resize; transform: translate(-7px, 0px); } .resizer.left { left: -5px; bottom: 50%; cursor: ew-resize; transform: translate(0px, 5px); }

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