我使用下面的代码将项目(左)拖动到放置项目(右)。一旦向右拖动,它们就可以向左拖动。
我在用着
document.getElementById(dropID).appendChild(document.getElementById(dragID))
将它们拖回来,所以它们总是作为最后一个 div 添加。
有什么办法可以将项目向左拖动,放置在左侧已经存在的其他 div 之间?而不是总是添加到最后?
此外,这将允许通过在它们之间拖动它们来对左侧的项目进行排序,这是否容易不使用 jquery?谢谢!
<!DOCTYPE HTML>
<html>
<head>
<style>
.dragAndDropContainer {
display: flex ;
justify-content: space-around;
font-family: Helvetica,Arial,Lucida,sans-serif ;
}
.dragItems {
display: flex ;
flex-direction: column;
justify-content: space-evenly;
text-align: center;
flex-grow: 1;
border: 1px solid black;
}
.dragItem {
margin: 10px;
padding: 10px;
border: 1px solid white;
background-color: rgb(52,118,177);
color: white;
font-weight: bold;
}
.dragItem:hover {
background: rgb(117, 168, 255);
}
.dropItems {
display: flex ;
flex-direction: column;
justify-content: space-evenly;
text-align: center;
flex-grow: 1;
}
.dropItem {
margin: 10px;
padding: 10px;
border: 3px solid rgb(160, 160, 160);
background-color: rgb(190, 190, 190);
color: black;
font-weight: bold;
}
.dropItem:hover {
color: white;
background: rgb(73, 86, 92);
}
</style>
<script>
// source based on: https://www.w3schools.com/html/html5_draganddrop.asp
function allowDrop(ev) {
var dropID = ev.currentTarget.id;
ev.preventDefault();
}
function drag(ev) {
ev.dataTransfer.setData("dragEventID", ev.currentTarget.id);
}
function drop(ev) {
ev.preventDefault();
var dragID = ev.dataTransfer.getData("dragEventID");
var dropID = ev.currentTarget.id;
var dropClass = ev.currentTarget.getAttribute("class");
var maximumDragItemsPerDropArea = 1 ;
if (dropClass=="dragItems") {
document.getElementById(dropID).appendChild(document.getElementById(dragID));
}
else if (dropClass = "dropItems") {
if (document.getElementById(dropID).childElementCount < maximumDragItemsPerDropArea) {
document.getElementById(dropID).appendChild(document.getElementById(dragID));
} else {
console.log("maximum "+ maximumDragItemsPerDropArea) ;
console.log(document.getElementById(dropID).children) ;
// alert("max");
}
}
}
</script>
</head>
<body>
<div id="dragAndDropContainer" class="dragAndDropContainer">
<div id="dragItems" class="dragItems" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">
<div id="dmDragItemID1" class="dragItem" draggable="true" ondragstart="drag(event)" > Drag item 1 </div>
<div id="dmDragItemID2" class="dragItem" draggable="true" ondragstart="drag(event)" > Drag item 2 </div>
<div id="dmDragItemID3" class="dragItem" draggable="true" ondragstart="drag(event)" > Drag item 3 </div>
</div>
<div id="dropItems" class="dropItems">
<div id="dmDropItemID1" class="dropItem" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">Drop item 1</div>
<div id="dmDropItemID2" class="dropItem" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">Drop item 2</div>
<div id="dmDropItemID3" class="dropItem" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">Drop item 3</div>
<div id="dmDropItemID4" class="dropItem" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">Drop item 4</div>
</div>
</div>
</body>
</html>
好的,我让它工作了,多亏了这个链接:
https://codepen.io/fitri/pen/VbrZQm
这是代码:
<html>
<head>
<style>
.dragAndDropContainer {
display: flex ;
justify-content: space-around;
font-family: Helvetica,Arial,Lucida,sans-serif ;
font-size: 11px;
}
.dragItems {
display: flex ;
flex-direction: column;
text-align: center;
flex-grow: 1;
border: 1px solid rgb(160, 160, 160);
}
.dragItem {
margin: 0px;
padding: 5px;
border: 1px solid white;
background-color: rgb(52,118,177);
color: white;
}
.dragItem:hover {
background: rgb(117, 168, 255);
}
.dropItems {
display: flex ;
flex-direction: column;
justify-content: space-evenly;
text-align: center;
flex-grow: 1;
}
.dropItem {
margin: 0px;
padding: 5px;
border: 1px solid white;
background-color: rgb(190, 190, 190);
color: black;
font-weight: bold;
}
.dropItem:hover {
color: white;
background: rgb(73, 86, 92);
}
</style>
<script>
/*
Resources:
https://www.w3schools.com/html/html5_draganddrop.asp
https://codepen.io/fitri/pen/VbrZQm
*/
function allowDrop(ev) {
var dropID = ev.currentTarget.id;
ev.preventDefault();
}
function drag(ev) {
ev.dataTransfer.setData("dragEventID", ev.currentTarget.id);
}
function drop(ev) {
ev.preventDefault();
var dragID = ev.dataTransfer.getData("dragEventID");
var dropID = ev.currentTarget.id;
var dropClass = ev.currentTarget.getAttribute("class");
var maximumDragItemsPerDropArea = 1 ;
if (dropClass == "dragItems") {
elementDropPoint = document.elementFromPoint(event.clientX, event.clientY);
// If drop area is the drag items container div, we add the dragged div to the end
if (elementDropPoint.className == "dragItems") {
document.getElementById(dropID).appendChild(document.getElementById(dragID));
}
// If drop area is between two drag item divs, we add the dragged div in the drop area, after the existing drag div
if (elementDropPoint.className == "dragItem") {
elementDropPoint.after(document.getElementById(dragID));
}
}
if (dropClass == "dropItem") {
if (document.getElementById(dropID).childElementCount < maximumDragItemsPerDropArea) {
document.getElementById(dropID).appendChild(document.getElementById(dragID));
} else {
console.log("maximum "+ maximumDragItemsPerDropArea) ;
console.log(document.getElementById(dropID).children) ;
// alert("max");
}
}
}
</script>
</head>
<body>
<div id="dragAndDropContainer" class="dragAndDropContainer">
<div id="dragItems" class="dragItems" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">
<div id="dmDragItemID1" class="dragItem" draggable="true" ondragstart="drag(event)" > FileNotes021.png </div>
<div id="dmDragItemID2" class="dragItem" draggable="true" ondragstart="drag(event)" > FileNotes025.png </div>
<div id="dmDragItemID3" class="dragItem" draggable="true" ondragstart="drag(event)" > FileNotes019.png </div>
<div id="dmDragItemID4" class="dragItem" draggable="true" ondragstart="drag(event)" > FileNotes015.png </div>
</div>
<div id="dropItems" class="dropItems">
<div id="dmDropItemID1" class="dropItem" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">Song 1</div>
<div id="dmDropItemID2" class="dropItem" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">Song 2</div>
<div id="dmDropItemID3" class="dropItem" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">Song 3</div>
<div id="dmDropItemID4" class="dropItem" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">Song 4</div>
<div id="dmDropItemID5" class="dropItem" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">Song 5</div>
<div id="dmDropItemID6" class="dropItem" ondrop="drop(event)" draggable="false" ondragover="allowDrop(event)">Song 6</div>
</div>
</div>
</body>
</html>
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