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HTML5 drag and drop upload file sample code sharing

黄舟

Mar 13, 2017 pm 05:24 PM

This article mainlyintroduces HTML5a simple example of dragging and uploading files. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor and take a look.

I have implemented quite a lot of functions on the HTML5 PC. I also use drag and drop uploading at work. I specially recorded this function.

Trigger an event on the drag target (source element):

ondragstart - triggers when the user starts dragging the element

ondrag - triggers when the element is being dragged

ondragend - Triggered after the user completes dragging the element

Event triggered when the target is released:

ondragenter - When dragged by the mouse This event is triggered when the moving object enters the scope of its container

ondragover - This event is triggered when a dragged object is dragged within the scope of another object's container

ondragleave - This event is triggered when the object being dragged by the mouse leaves the scope of its container

ondrop - This event is triggered when the mouse button is released during a dragging process

Above code

<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>拖拽</title>
    <style>
        .box{width:800px;height:600px;float:left;}
        #box1{background-color:#ccc;}
        #box2{background-color:#000;}
    </style>
</head>
<body>
    <p id="box1" class="box"></p>
    <p id="box2" class="box"></p>
    <img id="img1" src="1.jpg">
    <p id="msg"></p>
</body>
<script>
var box1p,box2p,msgp,img1; 
window.onload = function(){
    box1p = document.getElementById(&#39;box1&#39;);
    box2p = document.getElementById(&#39;box2&#39;);
    msgp = document.getElementById(&#39;msg&#39;);
    img1 = document.getElementById(&#39;img1&#39;);
    box1p.ondragover = function(e){e.preventDefault();}
    box2p.ondragover = function(e){e.preventDefault();}

    img1.ondragstart = function(e){e.dataTransfer.setData(&#39;imgId&#39;,&#39;img1&#39;);}
    box1p.ondrop = dropImghandler;
    box2p.ondrop = dropImghandler;
}
function dropImghandler(e){
    showObj(e);//获取拖放所有信息
    showObj(e.dataTransfer);//获取文件
    e.preventDefault();
    var img = document.getElementById(e.dataTransfer.getData(&#39;imgId&#39;));
    e.target.appendChild(img);
}
function showObj(obj){
    var s = &#39;&#39;;
    for(var k in obj){s += k+":"+obj[k]+"<br/>";}
    msgp.innerHTML = s;
}
</script>
</html>

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This function is a method for dragging pictures to the left and right p. I don’t think it is useful. It can be used as a Harbin Beer

below It is a drag and drop upload code. After the back-end PHP obtains $_FILES, it can be started

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>拖放上传</title>
    <style>
        #imgContainer{background:#ccc;width:500px;height:500px;}
    </style>
</head>
<body>
    <p id="imgContainer"></p>
    <p id="msg"></p>
</body>
<script>
var imgContainer,msgp;
window.onload = function(e){
    imgContainer = document.getElementById(&#39;imgContainer&#39;);
    msgp = document.getElementById(&#39;msg&#39;);
    imgContainer.ondragover = function(e){
        e.preventDefault();
    }
    imgContainer.ondrop = function(e){
        e.preventDefault();
        var f = e.dataTransfer.files[0];   
        //这时已经获取到文件了，具体想要用第几个文件自己处理，发post请求后端处理就行了！

        //下面是图片获取到之后显示在imgContainer中的流程
        // var fileReader = new FileReader();
        // fileReader.onload=function(){
        //  imgContainer.innerHTML = "<img src=\""+fileReader.result+"\">"
        // }
        // fileReader.readAsDataURL(f);
        // showObj(e);   //显示上传信息
        // showObj(e.dataTransfer.files);
    }
}
function showObj(obj){
    var s = &#39;&#39;;
    for(var k in obj){s += k+":"+obj[k]+"<br/>";}
    msgp.innerHTML = s;
}
</script>
</html>

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