无法将图像拖到第二个蒙版图像中

Question

此处：https://codepen.io/uidesigner/pen/rPzroa，当我在第一个蒙版图像中上传图像后，当我尝试在页面的其他任何地方时，都可以拖动上传的图像>

但是用户只能在尝试进入蒙版图像内部时拖动。...

问题：

我无法将上传的图像拖到蒙版图像2 .......

fileupa.onchange = e => {
  target_imga.src = URL.createObjectURL(fileupa.files[0]);
}

fileupb.onchange = e => {
  target_imgb.src = URL.createObjectURL(fileupb.files[0]);
}

let prevX = 0,
  prevY = 0,
  translateX = 0,
  translateY = 0,
  scale = 1,
  zoomFactor = 0.1;

function onDragStart(evt) {
  if (evt.dataTransfer && evt.dataTransfer.setDragImage) {
    evt.dataTransfer.setDragImage(evt.target.nextElementSibling, 0, 0);
  }
  prevX = evt.clientX;
  prevY = evt.clientY;
}

function onDragOver(evt) {
  translateX += evt.clientX - prevX;
  translateY += evt.clientY - prevY;
  prevX = evt.clientX;
  prevY = evt.clientY;
  updateStyle();
}

function updateStyle() {
  let transform = "translate(" + translateX + "px, " + translateY + "px) scale(" + scale + ")";

  if (document.querySelector('#uploadedImg img'))
    document.querySelector('#uploadedImg img').style.transform = transform;
}

.masked-imga {
  -webkit-mask-image: url(https://i.stack.imgur.com/EQpM4.png);
  mask-image: url(https://i.stack.imgur.com/EQpM4.png);
  -webkit-mask-position: center center;
  mask-position: center center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  display: block;
  width: 100%;
  height: 100%;
}

.masked-imgb {
  -webkit-mask-image: url(https://i.stack.imgur.com/EQpM4.png);
  mask-image: url(https://i.stack.imgur.com/EQpM4.png);
  -webkit-mask-position: center center;
  mask-position: center center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  display: block;
  width: 100%;
  height: 100%;
}

.minaimga,
.minaimgb {
  display: block;
  background-color: black;
  height: 500px;
}

<input type="file" id="fileupa" />
<input type="file" id="fileupb" />

<div class="minaimg masked-imga" ondragover="onDragOver(event)" ondragover="onDragOver(event)">
  <div draggable="true" ondragstart="onDragStart(event)" id="uploadedImg">
    <div class="minaimga">
      <!-- give an id for ease of selection -->
      <img id="target_imga" alt="">

      <div></div>

    </div>
  </div>
</div>

<div class="minaimg masked-imgb" ondragover="onDragOver(event)" ondragover="onDragOver(event)">
  <div draggable="true" ondragstart="onDragStart(event)" id="uploadedImg">
    <div class="minaimgb">
      <!-- give an id for ease of selection -->
      <img id="target_imgb" alt="">

      <div></div>

    </div>
  </div>
</div>

Answer 1

为uploadImg div提供不同的ID，然后在您的js中使用

if(document.querySelector('#uploadedImg2 img'))
document.querySelector('#uploadedImg2 img').style.transform = transform;

fileupa.onchange = e => {
 target_imga.src = URL.createObjectURL(fileupa.files[0]);   
}

fileupb.onchange = e => {
 target_imgb.src = URL.createObjectURL(fileupb.files[0]);   
}

let prevX = 0, prevY = 0,translateX = 0, translateY = 0, scale = 1, zoomFactor = 0.1;

function onDragStart(evt) {
  if (evt.dataTransfer && evt.dataTransfer.setDragImage) {
evt.dataTransfer.setDragImage(evt.target.nextElementSibling, 0, 0);
  }
  prevX = evt.clientX;
  prevY = evt.clientY;
}

function onDragOver(evt) {
  translateX += evt.clientX - prevX;
  translateY += evt.clientY - prevY;
  prevX = evt.clientX;
  prevY = evt.clientY;
  updateStyle();
}

function updateStyle() 
{ 
let transform = "translate(" +translateX+ "px, "+ translateY + "px) scale("+scale+")"; 

if(document.querySelector('#uploadedImg img'))
document.querySelector('#uploadedImg img').style.transform = transform;
}

function onDragOverSec(evt) {
  translateX += evt.clientX - prevX;
  translateY += evt.clientY - prevY;
  prevX = evt.clientX;
  prevY = evt.clientY;
  updateStyleSec();
}

function updateStyleSec() 
{ 
let transform = "translate(" +translateX+ "px, "+ translateY + "px) scale("+scale+")"; 

if(document.querySelector('#uploadedImg2 img'))
document.querySelector('#uploadedImg2 img').style.transform = transform;
}

.masked-imga {
  
  -webkit-mask-image: url(https://i.stack.imgur.com/EQpM4.png);
  mask-image: url(https://i.stack.imgur.com/EQpM4.png);
  -webkit-mask-position: center center;
  mask-position: center center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;  
  
  display: block;
  width: 100%;
  height: 100%;
}

 

.masked-imgb {
  
  -webkit-mask-image: url(https://i.stack.imgur.com/EQpM4.png);
  mask-image: url(https://i.stack.imgur.com/EQpM4.png);
  -webkit-mask-position: center center;
  mask-position: center center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;  
  
  display: block;
  width: 100%;
  height: 100%;
}

.minaimga,.minaimgb {
  display: block;
  background-color: black;
  height:500px;
}

<input type="file" id="fileupa" />
<input type="file" id="fileupb" />

<div class="minaimg masked-imga"   ondragover="onDragOver(event)"ondragover="onDragOver(event)" >
  <div draggable="true" ondragstart="onDragStart(event)" id="uploadedImg">
    <div class="minaimga">
      <!-- give an id for ease of selection -->
      <img id="target_imga"  alt="">

      <div></div>

    </div>
  </div>
</div>

<div class="minaimg masked-imgb"   ondragover="onDragOverSec(event)"ondragover="onDragOver(event)" >
  <div draggable="true" ondragstart="onDragStart(event)" id="uploadedImg2">
    <div class="minaimgb">
      <!-- give an id for ease of selection -->
      <img id="target_imgb"  alt="">

      <div></div>

    </div>
  </div>
</div>