This article mainlyintroducesHTML5a 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 src="/static/imghwm/default1.png" data-src="1.jpg" class="lazy" id="img1" alt="HTML5 drag and drop upload file sample code sharing" > <p id="msg"></p> </body> <script> var box1p,box2p,msgp,img1; window.onload = function(){ box1p = document.getElementById('box1'); box2p = document.getElementById('box2'); msgp = document.getElementById('msg'); img1 = document.getElementById('img1'); box1p.ondragover = function(e){e.preventDefault();} box2p.ondragover = function(e){e.preventDefault();} img1.ondragstart = function(e){e.dataTransfer.setData('imgId','img1');} 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('imgId')); e.target.appendChild(img); } function showObj(obj){ var s = ''; for(var k in obj){s += k+":"+obj[k]+"<br/>";} msgp.innerHTML = s; } </script> </html>
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('imgContainer'); msgp = document.getElementById('msg'); 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+"\" alt="HTML5 drag and drop upload file sample code sharing" >" // } // fileReader.readAsDataURL(f); // showObj(e); //显示上传信息 // showObj(e.dataTransfer.files); } } function showObj(obj){ var s = ''; for(var k in obj){s += k+":"+obj[k]+"<br/>";} msgp.innerHTML = s; } </script> </html>
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