![\"Drag](\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/172543910882770.png\")
<\/p>\n![\"Drag](\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/172543911139734.png\")
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Drag and Drop?in HTML
Sep 04, 2024 pm 04:38 PM
The following article provides an outline for Drag and Drop in HTML. Drag and Drop is the latest feature well-known for manually providing input in web pages due to its convenient functional pattern. The drag and drop method can be described as the process when a user selects a specific data/ option from the list of items in the source field, drag the same, and drop it in the destination field. It is implemented using Document Object Model, along with multiple mouse events from the HTML web page. The various events used in this feature are a drag, dragstart, dragleave, dragenter, dragover, drop, dragend and drag exit.
Events for Drag and Drop
There are multiple events included in the latest drag and drop (dnd) functionality; let’s see one by one as follows:
| Sr. No | Events | Details Description |
| 1 | Drag | To drag entity(element or text) when the mouse is moved with the element to be dragged. |
| 2 | Dragstart | The very first step in drag and drop is dragstart. It gets executed when the user is going to start with dragging the object to the required location. |
| 3 | Dragenter | Dragenter event is used when the mouse is getting hover on the target element. |
| 4 | Dragleave | This event is used when the user releases a mouse from an element. |
| 5 | Dragover | This event occurs when a mouse is used to over an element. |
| 6 | Drop | This event is used at the end of the drag and drop process for drop element operation. |
| 7 | Dragend | This is one of the most important event in this process for releasing the mouse button from the element to complete the drag procedure. |
| 8 | Dragexit | This event status that the element is no longer in the drag process of urgent target selection of element. |
ドラッグ アンド ドロップ操作が行われるデータ屬性をいくつか見(jiàn)てみましょう:
- dataTransfer.dropEffect [ = value ]: この屬性は、現(xiàn)在実行中の操作を示すために使用されます。すでに選択されている操作を置き換えるように設(shè)定できます。コピー、リンク、なし、移動(dòng)など、それに含まれる値。
- dataTransfer.effectAllowed [ = value ]: 許可されている操作はすべて、この屬性を通じて返されます。すでに選択されている操作を変更する設(shè)定も可能です。
- dataTransfer.files: このデータ屬性は、ドラッグされるファイルの fileList を取得するために使用されます。
- dataTransfer.addElement(element): ドラッグ フィードバックのレンダリングに役立つ他の要素のリストに既存の要素を挿入するために使用されます。
- dataTransfer.setDragImage(element, x, y): この屬性は、ドラッグ フィードバックを更新するための上記の屬性と少し同じで、既存のフィードバックの変更に役立ちます
- dataTransfer.clearData ( [ format ] ): これは、ユーザーがすでに定義されている形式からデータを削除するのに役立ちます。ユーザーが引數(shù)を省略した場(chǎng)合、IT 部門(mén)はすべてのデータを削除します。
- dataTransfer.setData(format, data): これは、指定されたデータを追加するために使用される一般的な屬性の 1 つです。
- data = dataTransfer.getData(format): ドラッグ アンド ドラッグ操作のこの屬性は、指定されたデータを抽出するために使用されます。同じデータがない場(chǎng)合は空文字列に戻ります。
HTML でのドラッグ アンド ドロップの構(gòu)文
ドラッグ アンド ドロップの構(gòu)文を定義するいくつかの手順を次に示します。
ドラッグするオブジェクトを選択します: 屬性を true に設(shè)定します。
<element draggable="true">
オブジェクトのドラッグ開(kāi)始:
function dragStart(ev){}
オブジェクトをドロップします:
function dragDrop(ev){}
HTML でのドラッグ アンド ドロップの例
次の例は、ドラッグ アンド ドロップ操作が HTML でどのように正確に実行されるかを示します。
例 #1
コード:
<html>
<head>
<title>Drag and Drop Demo</title>
<script>
function allowDrop(ev) {
ev.preventDefault();
}
function dragStart(ev) {
ev.dataTransfer.setData("text", ev.target.id);
}
function dragDrop(ev) {
ev.preventDefault();
var data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
}
</script>
<style>
#box {
margin: auto;
width: 30%;
width: 21%;
height:150px;
border: 2px solid blue;
padding: 2px;
}
#square1, #square2, #square3 {
float: left;
margin: 5px;
padding: 10px;
}
#square1 {
width: 30px;
height: 30px;
background-color: #BEA7CC;
}
#square2 {
width: 60px;
height: 60px;
background-color: #B5D5F5;
}
#square3 {
width: 90px;
height: 90px;
background-color:#F5B5C5 ;
}
h2 {
font-size:20px;
font-weight:bold;
text-align:center;
}
</style>
</head>
<body>
<h2>HTML DRAG AND DROP DEMO</h2>
<div id = "box">
<div id="square1" draggable="true"ondragstart="dragStart(event)"></div>
<div id="square2" draggable="true"ondragstart="dragStart(event)"></div>
<div id="square3" ondrop="dragDrop(event)" ondragover="allowDrop(event)"></div>
</div>
</body>
</html>
出力:
ドラッグ アンド ドロップする前、オプションの出力は次のようになります:
ドラッグ アンド ドロップ操作を?qū)g行すると、出力は次のようになります:
例 #2
ここでは、以下のコードに示すように、畫(huà)像をある場(chǎng)所から別の指定された場(chǎng)所に移動(dòng)する別の例を見(jiàn)ていきます。
コード:
<!DOCTYPE HTML>
<html>
<head>
<script>
function allowDrop(ev) {
ev.preventDefault();
}
function dragStart(ev) {
ev.dataTransfer.setData("text", ev.target.id);
}
function dragDrop(ev) {
ev.preventDefault();
var data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
}
</script>
<style>
.divfirst {
width: 250px;
height: 150px;
padding: 10px;
border: 1px solid black;
background-color: #F5F5F5;
}
p {
font-size:20px;
font-weight:bold;
}
</style>
</head>
<body>
<p>Image Drag and Drop Demo</p>
<div class="divfirst" ondrop="dragDrop(event)" ondragover="allowDrop(event)">
<img id="drag1"
src="Jerry.jpeg" draggable="true"
ondragstart="dragStart(event)" width="250" height="150"></div>
<br>
<div ??? class= "divfirst"ondrop="dragDrop(event)"
ondragover="allowDrop(event)"></div>
</body>
</html>
出力:
ドラッグ アンド ドロップ操作前の出力は次のとおりです:
ドラッグ アンド ドロップ操作が完了すると、次のようになります。
例 #3
この例では、指定した場(chǎng)所にファイルをドラッグ アンド ドロップする方法を見(jiàn)ていきます。
コード:
<body>
<div id="filedemo" style="min-height: 150px; border: 1px solid black;"
ondragenter="document.getElementById('output').textContent = ''; event.stopPropagation(); event.preventDefault();"
ondragover="event.stopPropagation(); event.preventDefault();"
ondrop="event.stopPropagation(); event.preventDefault();
dodrop(event);">
DROP FILES HERE...
</div>
<script>
function dodrop(event)
{
var dt = event.dataTransfer;
var files = dt.files;
for (var i = 0; i < files.length; i++) {
output(" File " + i + ":\n(" + (typeof files[i]) + ") : <" + files[i] + " > " +
files[i].name + " " );
}
}
function output(text)
{
document.getElementById("filedemo").textContent += text;
}
</script>
</body>
出力:
結(jié)論
HTML ドラッグ アンド ドロップは、コピー、削除、記録などのさまざまな目的に使用される最も重要なユーザー インターフェイス エンティティの 1 つです。上記のように、さまざまなイベントや屬性に対して機(jī)能します。オブジェクトを選択し、指定された場(chǎng)所にドロップすると、操作が実行されます。
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