javascript實作input file上傳圖片預覽效果-js教程-PHP中文網

javascript實作input file上傳圖片預覽效果

高洛峰

發布： 2016-12-28 16:48:27

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本文實例介紹了javascript實現input file上傳圖片預覽效果的詳細程式碼，分享給大家供大家參考，具體內容如下

運行效果圖：

javascript实现input file上传图片预览效果

具體實現代碼:

<!DOCTYPE html>
<html>
 
<head>
 <meta charset="utf-8">
 <title></title>
 <script type="text/javascript" src="jquery-1.11.1.min.js"></script>
 
 <style type="text/css">
  .imgbox,.imgbox1
  {
   float: left;
   margin-right: 20px;
   margin-top: 20px;
   position: relative;
   width: 182px;
   height: 142px;
   border: 1px solid red;
   overflow: hidden;
  }
  .imgbox1{border: 1px solid blue;
  }
 
 
  .imgnum{
   left: 0px;
   top: 0px;
   margin: 0px;
   padding: 0px;
  }
  .imgnum input,.imgnum1 input {
   position: absolute;
   width: 182px;
   height: 142px;
   opacity: 0;
  }
  .imgnum img,.imgnum1 img {
   width: 100%;
   height: 100%;
  }
  .close,
  .close1 {
   color: red;
   position: absolute;
   left: 170px;
   top: 0px;
   display: none;
  }
 
 
 
 
 
 </style>
</head>
 
<body>
<div id="img">
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img src="btn.png" class="img1" />
  <img src="" class="img2" />
 </div>
</div><div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img src="btn.png" class="img1" />
  <img src="" class="img2" />
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img src="btn.png" class="img1" />
  <img src="" class="img2" />
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img src="btn.png" class="img1" />
  <img src="" class="img2" />
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img src="btn.png" class="img1" />
  <img src="" class="img2" />
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img src="btn.png" class="img1" />
  <img src="" class="img2" />
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img src="btn.png" class="img1" />
  <img src="" class="img2" />
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img src="btn.png" class="img1" />
  <img src="" class="img2" />
 </div>
</div> <div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img src="btn.png" class="img1" />
  <img src="" class="img2" />
 </div>
</div>
 
 
 
<div class="imgbox1">
 <div class="imgnum">
  <input type="file" class="filepath1" />
  <span class="close1">X</span>
  <img src="btn.png" class="img11" />
  <img src="" class="img22" />
 </div>
</div>
 
</div>
 
</body>
<script type="text/javascript">
 $(function() {
  $(".filepath").on("change",function() {
   alert($(&#39;.imgbox&#39;).length);
   var srcs = getObjectURL(this.files[0]); //获取路径
   $(this).nextAll(".img1").hide(); //this指的是input
   $(this).nextAll(".img2").show(); //fireBUg查看第二次换图片不起做用
   $(this).nextAll(&#39;.close&#39;).show(); //this指的是input
   $(this).nextAll(".img2").attr("src",srcs); //this指的是input
   $(this).val(&#39;&#39;); //必须制空
   $(".close").on("click",function() {
    $(this).hide();  //this指的是span
    $(this).nextAll(".img2").hide();
    $(this).nextAll(".img1").show();
   })
  })
 })
 
 
 
 
 function getObjectURL(file) {
  var url = null;
  if (window.createObjectURL != undefined) {
   url = window.createObjectURL(file)
  } else if (window.URL != undefined) {
   url = window.URL.createObjectURL(file)
  } else if (window.webkitURL != undefined) {
   url = window.webkitURL.createObjectURL(file)
  }
  return url
 };
 
 
 
 
 
 $(function() {
  $("#img").on("change",".filepath1",function() {
   //alert($(&#39;.imgbox1&#39;).length);
   var srcs = getObjectURL(this.files[0]); //获取路径
   alert(srcs);
   //this指的是input
   /* $(this).nextAll(".img22").attr("src",srcs); //this指的是input
    $(this).nextAll(".img22").show(); //fireBUg查看第二次换图片不起做用*/
   var htmlImg=&#39;<div class="imgbox1">&#39;+
     &#39;<div class="imgnum1">&#39;+
     &#39;<input type="file" class="filepath1" />&#39;+
     &#39;<span class="close1">X</span>&#39;+
     &#39;<img src="btn.png" class="img11" />&#39;+
     &#39;<img src="&#39;+srcs+&#39;" class="img22" />&#39;+
     &#39;</div>&#39;+
     &#39;</div>&#39;;
 
   $(this).parent().parent().before(htmlImg);
   $(this).val(&#39;&#39;); //必须制空
   $(this).parent().parent().prev().find(".img11").hide(); //this指的是input
   $(this).parent().parent().prev().find(&#39;.close1&#39;).show();
 
   $(".close1").on("click",function() {
    $(this).hide();  //this指的是span
    $(this).nextAll(".img22").hide();
    $(this).nextAll(".img11").show();
    if($(&#39;.imgbox1&#39;).length>1){
     $(this).parent().parent().remove();
    }
 
   })
  })
 })
 
</script>
 
</html>

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