html5+php如何实现文件拖动上传功能-H5教程

[导读] 本文章介绍了关于在html5中实现文件上传的功能介绍，有需要的同学可以参考一下下哈。　　界面样式我是参考了一个国外的相册网站，改动不大，只是把鸟语转换成中文，以及上传时的样式也进行了改动，之所以选这个

本文章介绍了关于在html5中实现文件上传的功能介绍，有需要的同学可以参考一下下哈。

　　界面样式我是参考了一个国外的相册网站，改动不大，只是把鸟语转换成中文，以及上传时的样式也进行了改动，之所以选这个的原因就是，我很容易做扩展，它支持3种方式添加图片，一种拖拽上传，一种常规的选择文件上传，另外的就是添加网络图片。它很巧妙的把三种上传模式整合到了一起，而且你可以用IE浏览器浏览下，如果不支持HTML5，是没有拖拽上传图片的提示的，如图：

　　拖拽上传最重要的就是js部分的代码，它实现了70%的功能，另外30%仅仅是把图片信息提交到后台，然后做对应的处理，比如压缩啊，裁剪啊云云。所以先来看下js实现代码吧。

代码如下

复制代码

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script src="js/jquery-1.7.1.min.js"></script>
<style>
.dashboard_target_box{width:250px;height:105px;border:3px dashed #E5E5E5;text-align:center;position:absolute;z-index:2000;top:0;left:0;cursor:pointer}
.dashboard_target_box.over{border:3px dashed #000;background:#ffa}
.dashboard_target_messages_container{display:inline-block;margin:12px 0 0;position:relative;text-align:center;height:44px;overflow:hidden;z-index:2000}
.dashboard_target_box_message{position:relative;margin:4px auto;font:15px/18px helvetica,arial,sans-serif;font-size:15px;color:#999;font-weight:normal;width:150px;line-height:20px}
.dashboard_target_box.over #dtb-msg1{color:#000;font-weight:bold}
.dashboard_target_box.over #dtb-msg3{color:#ffa;border-color:#ffa}
#dtb-msg2{color:orange}
#dtb-msg3{display:block;border-top:1px #EEE dotted;padding:8px 24px}
</style>
<script>
$().ready(function(){
if($.browser.safari || $.browser.mozilla){
$('#dtb-msg1 .compatible').show();
$('#dtb-msg1 .notcompatible').hide();
$('#drop_zone_home').hover(function(){
$(this).children('p').stop().animate({top:'0px'},200);
},function(){
$(this).children('p').stop().animate({top:'-44px'},200);
});
//功能实现
$(document).on({
dragleave:function(e){
e.preventDefault();
$('.dashboard_target_box').removeClass('over');
},
drop:function(e){
e.preventDefault();
//$('.dashboard_target_box').removeClass('over');
},
dragenter:function(e){
e.preventDefault();
$('.dashboard_target_box').addClass('over');
},
dragover:function(e){
e.preventDefault();
$('.dashboard_target_box').addClass('over');
}
});
var box = document.getElementById('target_box');
box.addEventListener("drop",function(e){
e.preventDefault();
//获取文件列表
var fileList = e.dataTransfer.files;
var img = document.createElement('img');
//检测是否是拖拽文件到页面的操作
if(fileList.length == 0){
$('.dashboard_target_box').removeClass('over');
return;
}
//检测文件是不是图片
if(fileList[0].type.indexOf('image') === -1){
$('.dashboard_target_box').removeClass('over');
return;
}

if($.browser.safari){
//Chrome8+
img.src = window.webkitURL.createObjectURL(fileList[0]);
}else if($.browser.mozilla){
//FF4+
img.src = window.URL.createObjectURL(fileList[0]);
}else{
//实例化file reader对象
var reader = new FileReader();
reader.onload = function(e){
img.src = this.result;
$(document.body).appendChild(img);
}
reader.readAsDataURL(fileList[0]);
}
var xhr = new XMLHttpRequest();
xhr.open("post", "test.php", true);
xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
xhr.upload.addEventListener("progress", function(e){
$("#dtb-msg3").hide();
$("#dtb-msg4 span").show();
$("#dtb-msg4").children('span').eq(1).css({width:'0px'});
$('.show').html('');
if(e.lengthComputable){
var loaded = Math.ceil((e.loaded / e.total) * 100);
$("#dtb-msg4").children('span').eq(1).css({width:(loaded*2)+'px'});
}
}, false);
xhr.addEventListener("load", function(e){
$('.dashboard_target_box').removeClass('over');
$("#dtb-msg3").show();
$("#dtb-msg4 span").hide();
var result = jQuery.parseJSON(e.target.responseText);
alert(result.filename);
$('.show').append(result.img);
}, false);

var fd = new FormData();
fd.append('xfile', fileList[0]);
xhr.send(fd);
},false);
}else{
$('#dtb-msg1 .compatible').hide();
$('#dtb-msg1 .notcompatible').show();
}
});
</script>
</head>

<body>
<p id="target_box" class="dashboard_target_box">
<p id="drop_zone_home" class="dashboard_target_messages_container">
<p id="dtb-msg2" class="dashboard_target_box_message" style="top:-44px">选择你的图片<br>开始上传</p>
<p id="dtb-msg1" class="dashboard_target_box_message" style="top:-44px">
<span class="compatible" style="display:inline">拖动图片到</span><span class="notcompatible" style="display:none">点</span>这里<br>开始上传图片
</p>
</p>
<p id="dtb-msg3" class="dashboard_target_box_message">选择网络图片</p>
<p id="dtb-msg4" class="dashboard_target_box_message" style="position:relative">
<span style="display:none;width:200px;height:2px;background:#ccc;left:-25px;position:absolute;z-index:1"></span>
<span style="display:none;width:0px;height:2px;background:#09F;left:-25px;position:absolute;z-index:2"></span>
</p>
</p>
<p class="show" style="float:left;width:300px;height:150px;border:1px solid red;margin-top:200px;overflow:hidden;"></p>
</body>
</html>

test.php文件

代码如下

复制代码

<?php
$r = new stdClass();
header('content-type: application/json');
$maxsize = 10; //Mb
if($_FILES['xfile']['size'] > ($maxsize * 1048576)){
$r->error = "图片大小">图片大小不超过 $maxsize MB";
}
$folder = 'files/';
if(!is_dir($folder)){
mkdir($folder);
}
$folder .= $_POST['folder'] ? $_POST['folder'] . '/' : '';
if(!is_dir($folder)){
mkdir($folder);
}

if(preg_match('/image/i', $_FILES['xfile']['type'])){
$filename = $_POST['value'] ? $_POST['value'] : $folder . sha1(@microtime() . '-' . $_FILES['xfile']['name']) . '.jpg';
}else{
$tld = split(',', $_FILES['xfile']['name']);
$tld = $tld[count($tld) - 1];
$filename = $_POST['value'] ? $_POST['value'] : $folder . sha1(@microtime() . '-' . $_FILES['xfile']['name']) . $tld;
}

$types = Array('image/png', 'image/gif', 'image/jpeg');
if(in_array($_FILES['xfile']['type'], $types)){
$source = file_get_contents($_FILES["xfile"]["tmp_name"]);
imageresize($source, $filename, $_POST['width'], $_POST['height'], $_POST['crop'], $_POST['quality']);
}else{
move_uploaded_file($_FILES["xfile"]["tmp_name"], $filename);
}

$path = str_replace('test.php', '', $_SERVER['SCRIPT_NAME']);

$r->filename = $filename;
$r->path = $path;
$r->img = '<img src="' . $path . $filename . '" alt="image" />';

echo json_encode($r);

function imageresize($source, $destination, $width = 0, $height = 0, $crop = false, $quality = 80) {
$quality = $quality ? $quality : 80;
$image = imagecreatefromstring($source);
if ($image) {
// Get dimensions
$w = imagesx($image);
$h = imagesy($image);
if (($width && $w > $width) || ($height && $h > $height)) {
$ratio = $w / $h;
if (($ratio >= 1 || $height == 0) && $width && !$crop) {
$new_height = $width / $ratio;
$new_width = $width;
} elseif ($crop && $ratio <= ($width / $height)) {
$new_height = $width / $ratio;
$new_width = $width;
} else {
$new_width = $height * $ratio;
$new_height = $height;
}
} else {
$new_width = $w;
$new_height = $h;
}
$x_mid = $new_width * .5; //horizontal middle
$y_mid = $new_height * .5; //vertical middle
// Resample
error_log('height: ' . $new_height . ' - width: ' . $new_width);
$new = imagecreatetruecolor(round($new_width), round($new_height));
imagecopyresampled($new, $image, 0, 0, 0, 0, $new_width, $new_height, $w, $h);
// Crop
if ($crop) {
$crop = imagecreatetruecolor($width ? $width : $new_width, $height ? $height : $new_height);
imagecopyresampled($crop, $new, 0, 0, ($x_mid - ($width * .5)), 0, $width, $height, $width, $height);
//($y_mid - ($height * .5))
}
// Output
// Enable interlancing [for progressive JPEG]
imageinterlace($crop ? $crop : $new, true);

$dext = strtolower(pathinfo($destination, PATHINFO_EXTENSION));
if ($dext == '') {
$dext = $ext;
$destination .= '.' . $ext;
}
switch ($dext) {
case 'jpeg':
case 'jpg':
imagejpeg($crop ? $crop : $new, $destination, $quality);
break;
case 'png':
$pngQuality = ($quality - 100) / 11.111111;
$pngQuality = round(abs($pngQuality));
imagepng($crop ? $crop : $new, $destination, $pngQuality);
break;
case 'gif':
imagegif($crop ? $crop : $new, $destination);
break;
}
@imagedestroy($image);
@imagedestroy($new);
@imagedestroy($crop);
}
}
?>

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