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最近项目中要做一个带进度条的上传文件的功能,学习了Ajax,使用起来比较方便,将几个方法实现就行。

前端引入文件

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css"><script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script><script src="http://malsup.github.com/jquery.form.js"></script>
Ajax进度条异步处理

<script type="text/javascript">$(function () { $("#myupload").ajaxForm({ dataType:"json", beforeSend:function(){$(".progress").show(); }, uploadProgress:function(event,position,total,percentComplete){ var percentVal = percentComplete + "%"; $(".progress-bar").width(percentComplete + "%"); $(".progress-bar").html(percentVal); $(".sr-only").html(percentComplete + "%"); }, success:function(data){ $(".progress").hide(); if(data.error == "empty_name"){ alert("文件上传非法,上传失败!"); exit(); }; if(data.error == "large"){ alert("图片上传不能大于2M,上传失败!"); exit(); }; /*alert(data.error);*/ if(data.error == "format"){ alert("图片格式错误,上传失败"); //alert(data.type); exit(); }; //alert("上传成功!"); //files.html("<b>"+data.name+"("+data.size+"k)</b> <span class="delimg" rel=""+data.pic+"">删除</span>"); $(".files").html("文件名: "+data.name+"<span class="delimg" rel=""+data.pic+"">del</span>大小:"+data.size); var img = "http://www.sandleft.com/test/input/upload/files/"+data.pic; $(".showimg").html("<img src=""+img+"">"); alert("上传成功!"); }, error:function(){ alert("图片上传失败"); } }); $(".progress").hide();}); </script>
前端上传HTML

<div class="uk-container uk-container-center"> <div class="pk-system-messages"></div> <h1 class="uk-h2 uk-text-center" style="margin-top:-100px;">文件上传</h1><div class="pk-system-messages"></div><div class="container-main"><h1>Ajax Image Uploader</h1><p>A simple tutorial to explain image uploading using jquery ajax and php</p> <form id="myupload" action="new_upload.php" method="post" enctype="multipart/form-data"><label for="file">Filename:</label> <input type="file" name="mypic" id="file"><br> <input type="submit" name="upload" class="btn btn-success" value="upload"></form><div class="progress"> <div class="progress-bar progress-bar-success progress-bar-striped" role="progressbar" aria-valuenow="45" aria-valuemin="0" aria-valuemax="100" style="width: 0%"><span class="sr-only">0% Complete</span> </div> </div><div class="files"></div><div class="showimg"></div> </div></div>
PHP文件上传类

<?phpclass upload{ protected $file_path = "files"; //当前files存储文件夹#protected $file_size = 1024000;protected $file_size = 5120000; //5M 用户上传//检测文件是否为空 public function check_file($get_file) {if (empty($get_file)){ $type = "check_file"; $arr = array("error"=>"empty_name","type"=>$type); echo json_encode($arr); exit();}return true;} //检测文件类型 public function check_type($get_type) { if (( $get_type == ".docx" ) || ( $get_type == ".doc" )) {#$types = $get_type; }else{$type = "check_type";$arr = array("error"=>"format","type"=>$type);echo json_encode($arr);exit(); }return true; }//检测文件大小 public function check_size($get_file) { if ( $get_file != "" ) {if ( $get_file > $this->file_size ) {$arr = array("error"=>"large");echo json_encode($arr);exit();}}else{return false;exit();} return true; }//文件保存 public function save_file($file_type,$file_tmp_name) {$rand = rand(1000, 9999);$pics = date("YmdHis") . $rand . $file_type;$path = $this->file_path."/".$pics;$result = move_uploaded_file($file_tmp_name, $path);if($result){return $pics;}else{return false;exit();}#return $pics; } }PHP文件上传处理<?phpinclude("upload.class.php");$up_obj = new upload(); $get_fileName = $_FILES["mypic"]["name"];$get_fileSize = $_FILES["mypic"]["size"];$get_TmpFiles = $_FILES["mypic"]["tmp_name"]; $get_fileType = strstr($get_fileName, "."); $check_result = $up_obj->check_file($get_fileName); if($check_result){ //检查文件类型$result_type = $up_obj->check_type($get_fileType); //检查文件大小if($result_type){ $result_size = $up_obj->check_size($get_fileSize); if($result_size){//文件上传保存$pics = $up_obj->save_file($get_fileType,$get_TmpFiles); $size = round($get_fileSize/1024,2);$arr = array("name" => $get_fileName, "pic" => $pics, "size"=> $size, "error" => 2 );//检查文件上传状态 if($pics){ echo json_encode($arr); /* 执行上传完成逻辑..... */} }} }
文件上传效果如图:


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