HTML5 js implements drag-and-drop file upload function
A lot of functions have been implemented on the HTML5 PC, and drag and drop uploading is also used in the work. I specially recorded this function
Trigger events (source elements) on the drag target:
ondragstart - Triggered when the user starts dragging the element
ondrag - Triggered when the element is being dragged
ondragend - Triggered after the user completes dragging the element
Triggered when the target is released Events:
ondragenter - This event is triggered when the object being dragged by the mouse enters the scope of its container
ondragover - When a dragged object is dragged within the scope of another object's container This event is triggered when moving
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
上码
<html>
<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>
<div id="box1"></div>
<div id="box2"></div>
<img id="img1" src="1.jpg">
<div id="msg"></div>
</body>
<script>
var box1Div,box2Div,msgDiv,img1;
window.onload = function(){
box1Div = document.getElementById('box1');
box2Div = document.getElementById('box2');
msgDiv = document.getElementById('msg');
img1 = document.getElementById('img1');
box1Div.ondragover = function(e){e.preventDefault();}
box2Div.ondragover = function(e){e.preventDefault();}
img1.ondragstart = function(e){e.dataTransfer.setData('imgId','img1');}
box1Div.ondrop = dropImghandler;
box2Div.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/>";}
msgDiv.innerHTML = s;
}
</script>
</html>This function is a method for dragging images into the left and right divs. I don’t think it is useful. It can be used as Harbin Beer
The following is the drag and drop upload code, which is obtained by back-end PHP After getting to $_FILES, you can start it
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>拖放上传</title>
<style>
#imgContainer{background:#ccc;width:500px;height:500px;}
</style>
</head>
<body>
<div id="imgContainer"></div>
<div id="msg"></div>
</body>
<script>
var imgContainer,msgDiv;
window.onload = function(e){
imgContainer = document.getElementById('imgContainer');
msgDiv = 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+"\">"
// }
// 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/>";}
msgDiv.innerHTML = s;
}
</script>
</html>The above is the entire content of this article. I hope it will be helpful to everyone's learning, and I also hope that everyone will support the PHP Chinese website.
For more articles related to HTML5 js implementation of drag-and-drop file upload function, please pay attention to the PHP Chinese website!
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