5 powerful HTML5 API functions worth a
This article mainlyintroducesHTML5dragupload A simple example of a file. The editor thinks it is quite good. Now I will share it with you and share it with everyone. Be 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 on the drag targetEvent (source element):
ondragstart - Triggered when the user starts dragging the element
ondrag - The element is being Triggered when dragging
ondragend - Triggered after the user completes dragging the element
Events triggered when the target is released:
ondragenter - This event is triggered when the object dragged by the mouse enters the scope of its container
ondragover - When a dragged object is within the scope of another object This event is triggered when dragging within the container scope
ondragleave - This event is triggered when the object dragged by the mouse leaves the scope of its container
ondrop - During a dragging process, release the mouse This event is triggered when the key is pressed
The code above
<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('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 the picture to the left and right p , I think it is useless, it can be used as Harbin Beer
The following is the 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+"\">"
// }
// 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>The above is the detailed content of 5 powerful HTML5 API functions worth a. For more information, please follow other related articles on the PHP Chinese website!
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