javascript实现input file上传图片预览效果_javascript技巧-js教程-PHP中文网

本文实例介绍了javascript实现input file上传图片预览效果的详细代码，分享给大家供大家参考，具体内容如下
运行效果图：
具体实现代码:
<!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" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
  <img  src="" class="img2" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
 </div>
</div><div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img  src="btn.png" class="img1" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
  <img  src="" class="img2" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img  src="btn.png" class="img1" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
  <img  src="" class="img2" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img  src="btn.png" class="img1" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
  <img  src="" class="img2" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img  src="btn.png" class="img1" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
  <img  src="" class="img2" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img  src="btn.png" class="img1" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
  <img  src="" class="img2" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img  src="btn.png" class="img1" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
  <img  src="" class="img2" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
 </div>
</div>
<div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img  src="btn.png" class="img1" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
  <img  src="" class="img2" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
 </div>
</div> <div class="imgbox">
 <div class="imgnum">
  <input type="file" class="filepath" />
  <span class="close">X</span>
  <img  src="btn.png" class="img1" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
  <img  src="" class="img2" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
 </div>
</div>



<div class="imgbox1">
 <div class="imgnum">
  <input type="file" class="filepath1" />
  <span class="close1">X</span>
  <img  src="btn.png" class="img11" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
  <img  src="" class="img22" / alt="javascript实现input file上传图片预览效果_javascript技巧" >
 </div>
</div>

</div>

</body>
<script type="text/javascript">
 $(function() {
  $(".filepath").on("change",function() {
   alert($('.imgbox').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('.close').show(); //this指的是input
   $(this).nextAll(".img2").attr("src",srcs); //this指的是input
   $(this).val(''); //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() {
  $("#img").on("change",".filepath1",function() {
   //alert($('.imgbox1').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='<div class="imgbox1">'+
     '<div class="imgnum1">'+
     '<input type="file" class="filepath1" />'+
     '<span class="close1">X</span>'+
     '<img  src="btn.png" class="img11" / alt="javascript实现input file上传图片预览效果_javascript技巧" >'+
     '<img  src="'+srcs+'" class="img22" / alt="javascript实现input file上传图片预览效果_javascript技巧" >'+
     '</div>'+
     '</div>';

   $(this).parent().parent().before(htmlImg);
   $(this).val(''); //必须制空
   $(this).parent().parent().prev().find(".img11").hide(); //this指的是input
   $(this).parent().parent().prev().find('.close1').show();

   $(".close1").on("click",function() {
    $(this).hide();  //this指的是span
    $(this).nextAll(".img22").hide();
    $(this).nextAll(".img11").show();
    if($('.imgbox1').length>1){
     $(this).parent().parent().remove();
    }

   })
  })
 })

</script>

</html>
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