PHP+Ajax异步带进度条上传文件实例


            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="http://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







<?php

class 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

<?php

include("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：





以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持中文源码网。