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javascript - 如何根据js中的父位置动态调整div的大小

coder 2024-12-12 原文

我一直在编写一段代码，展示如何动态调整 div 的大小。然而，代码停留在 1 个元素上，我做了一些工作以转换为多个 div 调整器。

现在在调整大小时鼠标和 div 之间出现一个空格，我的目标是确保根据父位置使用精确的鼠标位置单独调整每个元素的大小。任何会改变我的观点的方法都是适用的。不绑定(bind)到调整大小的节点，而是直接持有 div 边框也是可能的。

到目前为止我取得的成就:

- 使多个 div 可通过鼠标位置调整大小。

-在函数中保存第一个位置信息。

-计算出 child 和 parent 之间的差异。

我想实现的目标:

- 确保在调整大小时鼠标和 div 之间没有任何空间时持有者保持在鼠标位置下方。

在多次尝试调整大小后，我发现父元素边距、填充等导致出现空格。 div 开始调整大小，div 和鼠标位置之间有一个空格。

我需要一个递归的计算解决方案来正确调整和重新定位 div。

可能是另一种方法可用于仅计算父级内部的 x、y、w、h，但我需要一些关于如何使用鼠标实现该目标的解释...

function resizeable() {
  var resizers = document.querySelectorAll('.n, .s, .w, .e, .nw, .ne, .se, .sw');
  const min = 40;
  for (let i = 0; i < resizers.length; i++) {
    const currentResizer = resizers[i];
    const element = currentResizer.parentElement;
    const parent = currentResizer.parentElement.parentElement;
    let p;
    let c;
    let original_w = 0;
    let original_h = 0;
    let parent_x = 0;
    let parent_y = 0;
    let child_x = 0;
    let child_y = 0;
    let mouse_x = 0;
    let mouse_y = 0;
    let scale_x = 0;
    let scale_y = 0;
    // Mouse events
    currentResizer.addEventListener('mousedown', function(e) {
      first(e);
      document.addEventListener('mousemove', resize);
      document.addEventListener('mouseup', stopResize);
      e.preventDefault();
    });
    // Log
    function log(e){
      var str = 'original_w['+original_w+'] original_h['+original_h+'] \n'+
                'parent_x['+parent_x+'] parent_y['+parent_y+'] \n'+
                'child_x['+child_x+'] child_y['+child_y+'] \n'+
                'scale_x['+scale_x+'] scale_y['+scale_y+'] \n'+
                'mouse_x['+mouse_x+'] mouse_y['+mouse_y+'] \n'+
                'e.pageX['+e.pageX+'] e.pageY['+e.pageY+'] \n'+
                'obj.left['+element.style.left+'] obj.top['+element.style.top+']';
      console.log(str);
      /**/
      str = '<table>'+
          '<tr>'+
            '<th colspan="2">First Locations:</td>'+
          '</tr>'+
          '<tr>'+
            '<td>original_w['+original_w+']</td>'+
            '<td>original_h['+original_h+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>parent_x['+parent_x+']</td>'+
            '<td>parent_y['+parent_y+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>child_x['+child_x+']</td>'+
            '<td>child_y['+child_y+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>scale_x['+scale_x+']</td>'+
            '<td>scale_y['+scale_y+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>mouse_x['+mouse_x+']</td>'+
            '<td>mouse_y['+mouse_y+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>e.pageX['+e.pageX+']</td>'+
            '<td>e.pageY['+e.pageY+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>obj.left['+element.style.left+']</td>'+
            '<td>obj.top['+element.style.top+']</td>'+
          '</tr>'
      '</table>';
      var m = document.getElementById("nfo"); // Debug element
      m.innerHTML = str;
    }
    // First location & width
    function first(e) {
      c = element.getBoundingClientRect();
      child_y = c.top;
      child_x = c.left;
      p = parent.getBoundingClientRect();
      parent_y = p.top;
      parent_x = p.left;
      original_w = parseFloat(c.width).toFixed(2);
      original_h = parseFloat(c.height).toFixed(2);
      scale_y = parseFloat(c.height / element.offsetHeight).toFixed(2);
      scale_x = parseFloat(c.width / element.offsetWidth).toFixed(2);
      mouse_y = e.pageY;
      mouse_x = e.pageX;
      log(e);
    }
    // Resize process
    function resize(e) {
      element.style.position = "absolute";
      if (currentResizer.classList.contains('se')) {
        const width = e.pageX - child_x;
        const height = e.pageY - child_y;
        if (width > min) {
          element.style.width = (width / scale_x) + 'px';
        }
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
        }
      }
      else if (currentResizer.classList.contains('sw')) {
        const width = original_w - (e.pageX - child_x);
        const height = e.pageY - child_y;
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
        }
        if (width > min) {
          element.style.left = e.pageX - parent_x + 'px';
          element.style.width = (width / scale_x) + 'px';
        }
      }
      else if (currentResizer.classList.contains('ne')) {
        const width = e.pageX - child_x;
        const height = original_h - (e.pageY - mouse_y);
        if (width > min) {
          element.style.width = (width / scale_x) + 'px';
        }
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
          element.style.top =  e.pageY - parent_y + 'px';
        }
      }
      else if (currentResizer.classList.contains('nw')) {
        const width = original_w - (e.pageX - child_x);
        const height = original_h - (e.pageY - mouse_y);
        if (width > min) {
          element.style.left = e.pageX - parent_x + 'px';
          element.style.width = (width / scale_x) + 'px';
        }
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
          element.style.top = e.pageY - parent_y + 'px';
        }
      }
      else if (currentResizer.classList.contains('e')) {
        const width = e.pageX - child_x;
        if (width > min) {
          element.style.width = (width / scale_x) + 'px';
        }
      }
      else if (currentResizer.classList.contains('s')) {
        const height = e.pageY - child_y;
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
        }
      }
      else if (currentResizer.classList.contains('w')) {
        const width = original_w - (e.pageX - child_x);
        if (width > min) {
          element.style.width = (width / scale_x) + 'px';
          element.style.left = (e.pageX - parent_x) + 'px';
        }
      }
      else if (currentResizer.classList.contains('n')) {
        const height = original_h - (e.pageY - mouse_y);
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
          element.style.top = e.pageY - parent_y + 'px';
        }
      }
      log(e);
    }
    // When mouse released stop
    function stopResize(e) {
      first(e);
      document.removeEventListener('mousemove', resize);
    }
  }
}
resizeable();
.another_element_on_the_way {
  position: relative;
  width: 100px;
  height: 100px;
  float: left;
}
#nfo {
  position: relative;
  float: left;
}
div {
  position: absolute;
  background-color: grey;
}
.holder {
  float: left;
  clear: left;
  position: relative;
  margin: 20px;
  width: 550px;
  height: 600px;
}
.scaled:hover:before, .regular:hover:before {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  width: calc(100% - 6px);
  height: calc(100% - 6px);
  border: 6px solid #ccc;
}
.regular:nth-child(1){
  top: 5px;
  left: 5px;
  width: 120px;
  height: 120px;
  background-color: red;
}
.regular:nth-child(3){
  top: 270px;
  left: 60px;
  width: 240px;
  height: 180px;
  background-color: blue;
}
.scaled {
  top: 150px;
  left: 25px;
  width: 160px;
  height: 160px;
  transform: scale(0.6) translate(0, 0);
  transform-origin: top left 0px;
  background-color: green;
  overflow: visible;
}
.previewHeader {
  position: absolute;
  top: 10px;
  left: 10px;
  background-color: #eee;
  border: 1px solid #dedede;
}
.n, .s, .w, .e, .nw, .ne, .se, .sw {
  position: absolute;
  width: 18px;
  height: 18px;
  border: 1px solid grey;
  border-radius: 20px;
  background-color: #fff;
}
.n:hover, .s:hover, .w:hover, .e:hover,
.nw:hover, .ne:hover, .se:hover, .sw:hover {
  background-color: red;
}
.nw {
  top: -10px;
  left: -10px;
  cursor: nw-resize;
}
.ne {
  top: -10px;
  left: calc(100% - 10px);
  cursor: ne-resize;
}
.sw {
  top: calc(100% - 10px);
  left: -10px;
  cursor: sw-resize;
}
.se {
  top: calc(100% - 10px);
  left: calc(100% - 10px);
  cursor: se-resize;
}
.n {
  top: -10px;
  left: calc(50% - 10px);
  cursor: n-resize;
}
.w {
  top: calc(50% - 10px);
  left: -10px;
  cursor: w-resize;
}
.e {
  top: calc(50% - 10px);
  left:  calc(100% - 10px);
  cursor: e-resize;
}
.s {
  top: calc(100% - 10px);
  left: calc(50% - 10px);
  cursor: s-resize;
}
<div class="another_element_on_the_way">
</div>
<div class="another_element_on_the_way">
</div>
<div class="another_element_on_the_way">
</div>
<div class="another_element_on_the_way">
</div>
<div class="another_element_on_the_way">
</div>
<div class="another_element_on_the_way">
</div>
<div class="holder">
  <div class="regular">
      <div class="previewHeader">Resizable</div>
      <div class="nw"></div>
      <div class="ne"></div>
      <div class="sw"></div>
      <div class="se"></div>
      <div class="n"></div>
      <div class="s"></div>
      <div class="w"></div>
      <div class="e"></div>
  </div>
  <div class="scaled">
    <div class="previewHeader">Scaled</div>
    <div class="nw"></div>
    <div class="ne"></div>
    <div class="sw"></div>
    <div class="se"></div>
    <div class="n"></div>
    <div class="s"></div>
    <div class="w"></div>
    <div class="e"></div>
  </div>
  <div class="regular">
    <div class="previewHeader">Resizable</div>
    <div class="nw"></div>
    <div class="ne"></div>
    <div class="sw"></div>
    <div class="se"></div>
    <div class="n"></div>
    <div class="s"></div>
    <div class="w"></div>
    <div class="e"></div>
  </div>
</div>
<div id="nfo"> X & Y</div>

还有一个代码笔可以更清楚地显示它:https://codepen.io/BerkerYuceer/pen/gOYwqdb

最佳答案

您可以使用 getComputedStyle 通过正则表达式获取 transform 值并将 1/scale 值应用于所需的坐标。我只能为 East holder 解决问题(我对坐标几何太笨了:P):

let match = getComputedStyle(element)
           .transform.match(/matrix\((-?\d*\.?\d+),\s*0,\s*0,\s*(-?\d*\.?\d+),\s*0,\s*0\)/);
let scale = 1; //for .regular folks
if (match && +match[1] != 0)
   scale = 1 / +match[1]; //because we need to unapply the transformation

示例:

function resizeable() {
  var resizers = document.querySelectorAll('.n, .s, .w, .e, .nw, .ne, .se, .sw');
  const min = 40;
  for (let i = 0; i < resizers.length; i++) {
    const currentResizer = resizers[i];
    const element = currentResizer.parentElement;
    const parent = currentResizer.parentElement.parentElement;
    let p;
    let c;
    let original_w = 0;
    let original_h = 0;
    let parent_x = 0;
    let parent_y = 0;
    let child_x = 0;
    let child_y = 0;
    let mouse_x = 0;
    let mouse_y = 0;
    let scale_x = 0;
    let scale_y = 0;
    let scroll_x = 0;
    let scroll_y = 0;
    // Mouse events
    currentResizer.addEventListener('mousedown', function(e) {
      first(e);
      document.addEventListener('mousemove', resize);
      document.addEventListener('mouseup', stopResize);
      e.preventDefault();
    });
    // Log
    function log(e){
      var str = 'original_w['+original_w+'] original_h['+original_h+'] \n'+
                'parent_x['+parent_x+'] parent_y['+parent_y+'] \n'+
                'scroll_x['+scroll_x+'] scroll_y['+scroll_y+'] \n'+
                'child_x['+child_x+'] child_y['+child_y+'] \n'+
                'scale_x['+scale_x+'] scale_y['+scale_y+'] \n'+
                'mouse_x['+mouse_x+'] mouse_y['+mouse_y+'] \n'+
                'e.pageX['+e.pageX+'] e.pageY['+e.pageY+'] \n'+
                'obj.left['+element.style.left+'] obj.top['+element.style.top+']';
      console.log(str);
      /**/
      str = '<table>'+
          '<tr>'+
            '<th colspan="2">First Locations:</td>'+
          '</tr>'+
          '<tr>'+
            '<td>original_w['+original_w+']</td>'+
            '<td>original_h['+original_h+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>parent_x['+parent_x+']</td>'+
            '<td>parent_y['+parent_y+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>scroll_x['+scroll_x+']</td>'+
            '<td>scroll_y['+scroll_y+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>child_x['+child_x+']</td>'+
            '<td>child_y['+child_y+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>scale_x['+scale_x+']</td>'+
            '<td>scale_y['+scale_y+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>mouse_x['+mouse_x+']</td>'+
            '<td>mouse_y['+mouse_y+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>e.pageX['+e.pageX+']</td>'+
            '<td>e.pageY['+e.pageY+']</td>'+
          '</tr>'+
          '<tr>'+
            '<td>obj.left['+element.style.left+']</td>'+
            '<td>obj.top['+element.style.top+']</td>'+
          '</tr>'
      '</table>';
      var m = document.getElementById("nfo"); // Debug element
      m.innerHTML = str;
    }
    // First location & width
    function first(e) {
      c = element.getBoundingClientRect();
      child_y = c.top;
      child_x = c.left;
      p = parent.getBoundingClientRect();
      parent_y = p.top;
      parent_x = p.left;
      scroll_y = window.scrollY;
      scroll_x = window.scrollX;
      original_w = parseFloat(c.width).toFixed(2);
      original_h = parseFloat(c.height).toFixed(2);
      scale_y = parseFloat(c.height / element.offsetHeight).toFixed(2);
      scale_x = parseFloat(c.width / element.offsetWidth).toFixed(2);
      mouse_y = e.pageY - scroll_y;
      mouse_x = e.pageX - scroll_x;
      log(e);
    }
    // Resize process
    function resize(e) {
      element.style.position = "absolute";
      if (currentResizer.classList.contains('se')) {
        const width = e.pageX - scroll_x - child_x ;
        const height = e.pageY - scroll_y - child_y ;
        if (width > min) {
          element.style.width = (width / scale_x) + 'px';
        }
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
        }
      }
      else if (currentResizer.classList.contains('sw')) {
        const width = original_w - (e.pageX - scroll_x - child_x);
        const height = e.pageY - scroll_y - child_y;
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
        }
        if (width > min) {
          element.style.left = e.pageX - scroll_x - parent_x + 'px';
          element.style.width = (width / scale_x) + 'px';
        }
      }
      else if (currentResizer.classList.contains('ne')) {
        const width = e.pageX - child_x - scroll_x;
        const height = original_h - (e.pageY - mouse_y - scroll_y);
        if (width > min) {
          element.style.width = (width / scale_x)  + 'px';
        }
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
          element.style.top =  e.pageY - parent_y - scroll_y + 'px';
        }
      }
      else if (currentResizer.classList.contains('nw')) {
        const width = original_w - (e.pageX - scroll_x - child_x);
        const height = original_h - (e.pageY - scroll_y - mouse_y);
        if (width > min) {
          element.style.left = e.pageX - parent_x - scroll_x + 'px';
          element.style.width = (width / scale_x) + 'px';
        }
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
          element.style.top = e.pageY - parent_y - scroll_y + 'px';
        }
      }
      else if (currentResizer.classList.contains('e')) {
        const width = e.pageX - scroll_x - child_x;
        if (width > min) {
          element.style.width = (width / scale_x) + 'px';
        }
      }
      else if (currentResizer.classList.contains('s')) {
        const height = e.pageY - scroll_y - child_y;
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
        }
      }
      else if (currentResizer.classList.contains('w')) {
        const width = original_w - (e.pageX - scroll_x - child_x);
        if (width > min) {
          element.style.width = (width / scale_x) + 'px';
          element.style.left = (e.pageX - scroll_x - parent_x) + 'px';
        }
      }
      else if (currentResizer.classList.contains('n')) {
        const height = original_h - (e.pageY - scroll_y - mouse_y);
        if (height > min) {
          element.style.height = (height / scale_y) + 'px';
          element.style.top = e.pageY - scroll_y - parent_y + 'px';
        }
      }
      log(e);
    }
    // When mouse released stop
    function stopResize(e) {
      first(e);
      document.removeEventListener('mousemove', resize);
    }
  }
}
resizeable();
body {
  width: 1200px;
}
.another_element_on_the_top {
  position: relative;
  float: left;
  margin: 10px;
  width: 100px;
  height: 100px;
}
.another_element_on_the_left {
  position: relative;
  float: left;
  clear: left;
  margin: 10px;
  width: 100px;
  height: 100px;
}
#nfo {
  position: relative;
  float: left;
}
div {
  position: absolute;
  background-color: grey;
}
.holder {
  float: left;
  position: relative;
  margin: -470px 20px 20px 20px;
  width: 550px;
  height: 600px;
}
.scaled:hover:before, .regular:hover:before {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  width: calc(100% - 6px);
  height: calc(100% - 6px);
  border: 6px solid #ccc;
}
.regular:nth-child(1){
  top: 5px;
  left: 5px;
  width: 120px;
  height: 120px;
  background-color: red;
}
.regular:nth-child(3){
  top: 270px;
  left: 60px;
  width: 240px;
  height: 180px;
  background-color: blue;
}
.scaled {
  top: 150px;
  left: 25px;
  width: 160px;
  height: 160px;
  transform: scale(0.6) translate(0, 0);
  transform-origin: top left 0px;
  background-color: green;
  overflow: visible;
}
.previewHeader {
  position: absolute;
  top: 10px;
  left: 10px;
  background-color: #eee;
  border: 1px solid #dedede;
}
.n, .s, .w, .e, .nw, .ne, .se, .sw {
  position: absolute;
  width: 18px;
  height: 18px;
  border: 1px solid grey;
  border-radius: 20px;
  background-color: #fff;
}
.n:hover, .s:hover, .w:hover, .e:hover,
.nw:hover, .ne:hover, .se:hover, .sw:hover {
  background-color: red;
}
.nw {
  top: -10px;
  left: -10px;
  cursor: nw-resize;
}
.ne {
  top: -10px;
  left: calc(100% - 10px);
  cursor: ne-resize;
}
.sw {
  top: calc(100% - 10px);
  left: -10px;
  cursor: sw-resize;
}
.se {
  top: calc(100% - 10px);
  left: calc(100% - 10px);
  cursor: se-resize;
}
.n {
  top: -10px;
  left: calc(50% - 10px);
  cursor: n-resize;
}
.w {
  top: calc(50% - 10px);
  left: -10px;
  cursor: w-resize;
}
.e {
  top: calc(50% - 10px);
  left:  calc(100% - 10px);
  cursor: e-resize;
}
.s {
  top: calc(100% - 10px);
  left: calc(50% - 10px);
  cursor: s-resize;
}
<div class="another_element_on_the_top">
</div>
<div class="another_element_on_the_top">
</div>
<div class="another_element_on_the_top">
</div>
<div class="another_element_on_the_top">
</div>
<div class="another_element_on_the_top">
</div>
<div class="another_element_on_the_top">
</div>
<div class="another_element_on_the_top">
</div>
<div class="another_element_on_the_top">
</div>
<div class="another_element_on_the_top">
</div>
<div class="another_element_on_the_top">
</div>

<div class="another_element_on_the_left">
</div>
<div class="another_element_on_the_left">
</div>
<div class="another_element_on_the_left">
</div>
<div class="another_element_on_the_left">
</div>
<div class="another_element_on_the_left">
</div>

<div class="holder">
  <div class="regular">
      <div class="previewHeader">Resizable</div>
      <div class="nw"></div>
      <div class="ne"></div>
      <div class="sw"></div>
      <div class="se"></div>
      <div class="n"></div>
      <div class="s"></div>
      <div class="w"></div>
      <div class="e"></div>
  </div>
  <div class="scaled">
    <div class="previewHeader">Scaled</div>
    <div class="nw"></div>
    <div class="ne"></div>
    <div class="sw"></div>
    <div class="se"></div>
    <div class="n"></div>
    <div class="s"></div>
    <div class="w"></div>
    <div class="e"></div>
  </div>
  <div class="regular">
    <div class="previewHeader">Resizable</div>
    <div class="nw"></div>
    <div class="ne"></div>
    <div class="sw"></div>
    <div class="se"></div>
    <div class="n"></div>
    <div class="s"></div>
    <div class="w"></div>
    <div class="e"></div>
  </div>
</div>
<div id="nfo"> X & Y</div>

或使用 this另一个问题中的方法。 

   var element = document.querySelector('...');
   var scaleX = element.getBoundingClientRect().width / element.offsetWidth;

"This works because getBoundingClientRect returns the actual dimension while offsetWidth/Height is the unscaled size."

编辑 window.scrollX/Y 添加。现在它可以在滚动页面中使用。

为了将来在页面的任何部分进行引用，它都可以正常工作。即使对象被缩放。

关于javascript - 如何根据js中的父位置动态调整div的大小，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57621679/

javascriptdiv39gthtmlcssresize

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