jquery+php实现ajax单个上传

jopen 7年前

HTML部分

<script type="text/javascript" src="jquery.min.js"></script>  <script type="text/javascript" src="jquery.form.js"></script>    <div class="btn">       <span>添加附件</span>       <input id="fileupload" type="file" name="mypic">  </div>  <div class="progress">      <span class="bar"></span><span class="percent">0%</span >  </div>  <div class="files"></div>  <div id="showimg"></div> 


CSS部分
.btn{position: relative;overflow: hidden;margin-right: 4px;display:inline-block;  *display:inline;padding:4px 10px 4px;font-size:14px;line-height:18px;  *line-height:20px;color:#fff;  text-align:center;vertical-align:middle;cursor:pointer;background:#5bb75b;  border:1px solid #cccccc;border-color:#e6e6e6 #e6e6e6 #bfbfbf;  border-bottom-color:#b3b3b3;-webkit-border-radius:4px;  -moz-border-radius:4px;border-radius:4px;}  .btn input{position: absolute;top: 0; right: 0;margin: 0;border:solid transparent;  opacity: 0;filter:alpha(opacity=0); cursor: pointer;}  .progress{position:relative; margin-left:100px; margin-top:-24px;    width:200px;padding: 1px; border-radius:3px; display:none}  .bar {background-color: green; display:block; width:0%; height:20px;    border-radius:3px; }  .percent{position:absolute; height:20px; display:inline-block;    top:3px; left:2%; color:#fff }  .files{height:22px; line-height:22px; margin:10px 0}  .delimg{margin-left:20px; color:#090; cursor:pointer} 


js部分

$(function () {      var bar = $('.bar');      var percent = $('.percent');      var showimg = $('#showimg');      var progress = $(".progress");      var files = $(".files");      var btn = $(".btn span");      $("#fileupload").wrap("<form id='myupload' action='action.php'        method='post' enctype='multipart/form-data'></form>");      $("#fileupload").change(function(){ //选择文件          $("#myupload").ajaxSubmit({              dataType:  'json', //数据格式为json              beforeSend: function() { //开始上传                  showimg.empty(); //清空显示的图片                  progress.show(); //显示进度条                  var percentVal = '0%'; //开始进度为0%                  bar.width(percentVal); //进度条的宽度                  percent.html(percentVal); //显示进度为0%                  btn.html("上传中..."); //上传按钮显示上传中              },              uploadProgress: function(event, position, total, percentComplete) {                  var percentVal = percentComplete + '%'; //获得进度                  bar.width(percentVal); //上传进度条宽度变宽                  percent.html(percentVal); //显示上传进度百分比              },              success: function(data) { //成功                  //获得后台返回的json数据,显示文件名,大小,以及删除按钮                  files.html("<b>"+data.name+"("+data.size+"k)</b>                    <span class='delimg' rel='"+data.pic+"'>删除</span>");                  //显示上传后的图片                  var img = "http://demo.helloweba.com/upload/files/"+data.pic;                  showimg.html("<img src='"+img+"'>");                  btn.html("添加附件"); //上传按钮还原              },              error:function(xhr){ //上传失败                  btn.html("上传失败");                  bar.width('0');                  files.html(xhr.responseText); //返回失败信息              }          });      });      ...  });    //接下来,文件上传完成,如果用户想删除上传的文件,可以写个ajax post请求来完成删除操作。    $(function () {      ...接上面的代码      $(".delimg").live('click',function(){          var pic = $(this).attr("rel");          $.post("action.php?act=delimg",{imagename:pic},function(msg){              if(msg==1){                  files.html("删除成功.");                  showimg.empty(); //清空图片                  progress.hide(); //隐藏进度条              }else{                  alert(msg);              }          });      });  }); 


PHP部分

action.php中需要处理图片上传以及删除图片。图片上传时需要验证格式和大小,然后通过move_uploaded_file()方法上传图片,最后返回json格式的数据。删除图片时使用unlink()即可完成删除操作。

$action = $_GET['act'];  if($action=='delimg'){ //删除图片      $filename = $_POST['imagename'];      if(!empty($filename)){          unlink('files/'.$filename);          echo '1';      }else{          echo '删除失败.';      }  }else{ //上传图片      $picname = $_FILES['mypic']['name'];      $picsize = $_FILES['mypic']['size'];      if ($picname != "") {          if ($picsize > 512000) { //限制上传大小              echo '图片大小不能超过500k';              exit;          }          $type = strstr($picname, '.'); //限制上传格式          if ($type != ".gif" && $type != ".jpg") {              echo '图片格式不对!';              exit;          }          $rand = rand(100, 999);          $pics = date("YmdHis") . $rand . $type; //命名图片名称          //上传路径          $pic_path = "files/". $pics;          move_uploaded_file($_FILES['mypic']['tmp_name'], $pic_path);      }      $size = round($picsize/1024,2); //转换成kb      $arr = array(          'name'=>$picname,          'pic'=>$pics,          'size'=>$size      );      echo json_encode($arr); //输出json数据  }

本文借助了jquery form插件来完成单文