在另一个 div 中创建一个可拖动的 div

Question

I have a draggable div designed by code below.我有一个由下面的代码设计的可拖动的 div。 Now I want to put this div in an other div.现在我想把这个 div 放在另一个 div 中。 I want my first div move just inside of second div not allover the web page.我希望我的第一个 div 移动到第二个 div 的内部，而不是整个 web 页面。 I put <div> </div> any where of my code but did not see what I want.我将<div> </div>放在我的代码的任何位置，但没有看到我想要的东西。

The code is:代码是：

 //Make the DIV element draggagle: dragElement(document.getElementById("mydiv")); function dragElement(elmnt) { var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0; if (document.getElementById(elmnt.id + "header")) { /* if present, the header is where you move the DIV from:*/ document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown; } else { /* otherwise, move the DIV from anywhere inside the DIV:*/ elmnt.onmousedown = dragMouseDown; } function dragMouseDown(e) { e = e || window.event; e.preventDefault(); // get the mouse cursor position at startup: pos3 = e.clientX; pos4 = e.clientY; document.onmouseup = closeDragElement; // call a function whenever the cursor moves: document.onmousemove = elementDrag; } function elementDrag(e) { e = e || window.event; e.preventDefault(); // calculate the new cursor position: pos1 = pos3 - e.clientX; pos2 = pos4 - e.clientY; pos3 = e.clientX; pos4 = e.clientY; // set the element's new position: elmnt.style.top = (elmnt.offsetTop - pos2) + "px"; elmnt.style.left = (elmnt.offsetLeft - pos1) + "px"; } function closeDragElement() { /* stop moving when mouse button is released:*/ document.onmouseup = null; document.onmousemove = null; } }

 #mydiv { position: absolute; z-index: 9; text-align: center; border: 1px solid #d3d3d3; } #mydivheader { padding: 10px; cursor: move; z-index: 10; } @media print { body{ width: 21cm; height: 29.7cm; margin: 0 0mm 0mm 0mm; /* change the margins as you want them to be. */ } }

 <div id="mydiv"> <div id="mydivheader">my text</div> </div>

Can anyone help me please?谁能帮帮我吗？ ;-) ;-)

Answer 1

Add parent div for the draggable div and set its position to relative and set overflow:hidden for it and set draggable div's position to absolute .为可拖动 div 添加父 div 并将其position设置为relative并为其设置overflow:hidden并将可拖动 div 的position设置为absolute 。 Also set the dragElement target to mydivheader同时将dragElement目标设置为mydivheader

 <html> <style> #mydiv { position: absolute; z-index: 9; text-align: center; border: 1px solid #d3d3d3; } #mydivheader { padding: 10px; cursor: move; z-index: 10; position: absolute; } #dragParent { width: 300px; margin: auto; overflow: hidden; height: 200px; position: relative; border: 1px solid #e5e5e5; } @media print { body{ width: 21cm; height: 29.7cm; margin: 0 0mm 0mm 0mm; /* change the margins as you want them to be. */ } } </style> <body> <div id="mydiv"> <div id="dragParent"> <div id="mydivheader">my text</div> </div> </div> <script> //Make the DIV element draggagle: dragElement(document.getElementById("mydivheader")); function dragElement(elmnt) { var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0; if (document.getElementById(elmnt.id + "header")) { /* if present, the header is where you move the DIV from:*/ document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown; } else { /* otherwise, move the DIV from anywhere inside the DIV:*/ elmnt.onmousedown = dragMouseDown; } function dragMouseDown(e) { e = e || window.event; e.preventDefault(); // get the mouse cursor position at startup: pos3 = e.clientX; pos4 = e.clientY; document.onmouseup = closeDragElement; // call a function whenever the cursor moves: document.onmousemove = elementDrag; } function elementDrag(e) { e = e || window.event; e.preventDefault(); // calculate the new cursor position: pos1 = pos3 - e.clientX; pos2 = pos4 - e.clientY; pos3 = e.clientX; pos4 = e.clientY; // set the element's new position: elmnt.style.top = (elmnt.offsetTop - pos2) + "px"; elmnt.style.left = (elmnt.offsetLeft - pos1) + "px"; } function closeDragElement() { /* stop moving when mouse button is released:*/ document.onmouseup = null; document.onmousemove = null; } } </script> </body> </html>

Answer 2

We could restrict the movement of draggable element within the dimensions of parent element.我们可以将可拖动元素的移动限制在父元素的尺寸范围内。 Thats what is done in below lines of code:这就是下面几行代码所做的：

<!DOCTYPE html>
<html>
<style>
#wrapper {
    width: 200px;
    height: 200px;
    background-color: grey;
    position: relative;
}
#mydiv {
  position: absolute;
  z-index: 9;
  
  text-align: center;
  border: 1px solid #d3d3d3;
}

#mydivheader {
  padding: 10px;
  cursor: move;
  z-index: 10; 
}

@media print {
    body{
        width: 21cm;
        height: 29.7cm;
        margin: 0 0mm 0mm 0mm; 
        /* change the margins as you want them to be. */
   } 
}
</style>
<body>
<div id="wrapper">
<div id="mydiv">
  <div id="mydivheader">my text</div>
</div>
</div>

<script>
//Make the DIV element draggagle:
dragElement(document.getElementById("mydiv"));

function dragElement(elmnt) {
  var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
  if (document.getElementById(elmnt.id + "header")) {
    /* if present, the header is where you move the DIV from:*/
    document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
  } else {
    /* otherwise, move the DIV from anywhere inside the DIV:*/
    elmnt.onmousedown = dragMouseDown;
  }

  function dragMouseDown(e) {
    e = e || window.event;
    e.preventDefault();
    // get the mouse cursor position at startup:
    pos3 = e.clientX;
    pos4 = e.clientY;
    document.onmouseup = closeDragElement;
    // call a function whenever the cursor moves:
    document.onmousemove = elementDrag;
  }

  function elementDrag(e) {
    e = e || window.event;
    e.preventDefault();
    // calculate the new cursor position:
    pos1 = pos3 - e.clientX;
    pos2 = pos4 - e.clientY;
    pos3 = e.clientX;
    pos4 = e.clientY;
    
    let parentElement = elmnt.parentElement;
    if(elmnt.offsetTop < 0){elmnt.style.top = "0px"; return;}
    if(elmnt.offsetTop > (parentElement.offsetHeight - elmnt.offsetHeight))     {
        elmnt.style.top = (parentElement.offsetHeight - elmnt.offsetHeight) + "px"; 
        return;
      }
    if(elmnt.offsetLeft < 0){elmnt.style.left = "0px";return}
    if(elmnt.offsetLeft > (parentElement.offsetWidth - elmnt.offsetWidth)){
        elmnt.style.left = (parentElement.offsetWidth - elmnt.offsetWidth) + "px";
        return;
    }
    
    // set the element's new position:
    elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
    elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
  }

  function closeDragElement() {
    /* stop moving when mouse button is released:*/
    document.onmouseup = null;
    document.onmousemove = null;
  }
}
</script>

</body>
</html>

The additional js code added is:添加的额外js代码是：

    let parentElement = elmnt.parentElement;
    if(elmnt.offsetTop < 0){elmnt.style.top = "0px"; return;}
    if(elmnt.offsetTop > (parentElement.offsetHeight - elmnt.offsetHeight))     {
        elmnt.style.top = (parentElement.offsetHeight - elmnt.offsetHeight) + "px"; 
        return;
      }
    if(elmnt.offsetLeft < 0){elmnt.style.left = "0px";return}
    if(elmnt.offsetLeft > (parentElement.offsetWidth - elmnt.offsetWidth)){
        elmnt.style.left = (parentElement.offsetWidth - elmnt.offsetWidth) + "px";
        return;
    }

These are just a couple of checks, to not change element's position if it goes beyond the dimensions of parent element.这些只是一些检查，如果元素的 position 超出了父元素的尺寸，则不会更改它。

在另一个 div 中创建一个可拖动的 div

问题描述

2 个解决方案

解决方案1
2 2021-09-27 13:09:30

解决方案2
0 已采纳 2021-09-27 14:07:35

在另一个 div 中创建一个可拖动的 div

问题描述

2 个解决方案

解决方案1 2 2021-09-27 13:09:30

解决方案2 0 已采纳 2021-09-27 14:07:35

解决方案1
2 2021-09-27 13:09:30

解决方案2
0 已采纳 2021-09-27 14:07:35