Example of how jQuery uses uploadView to implement image preview upload function-JS Tutorial-php.cn

Example of how jQuery uses uploadView to implement image preview upload function

黄舟

Release： 2017-08-11 13:56:35

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图片上传，网上有好多版本，今天小编给大家分享jquery.uploadView 实现图片预览上传功能，感兴趣的的朋友一起看看吧

图片上传，网上有好多版本，今天也要做一个查了好多最终找到了一个uploadview 进行了一下修改

来看代码

@{
 Layout = null;
}
<!DOCTYPE html>
<html>
<head>
 <meta name="viewport" content="width=device-width" />
 <title>Index</title>
 <script src="~/Scripts/jquery-1.8.2.min.js"></script>
 <script src="~/Scripts/jquery.uploadView.js"></script>
</head>
<body>
 <p>
  <p class="shangchuan">
   <h4>示例</h4>
   <p class="js_uploadBox" style="position: relative">
    <p id="preview" class="js_showBox">
     <img id="imghead" border="0" src="http://static.neihanhongbao.com/highads/images/nologo.jpg" alt="上传图片" style="width:100px; height:100px" />
    </p>
    <input type="file" name="file" id="id" style="position: absolute; top: 0px; left:0px; height: 100px; filter: alpha(opacity:0); opacity: 0; width: 100px" onclick="Upload()">
   </p>
   <input type="hidden" id="hidTmp_ID" name="Tmp_ID" value="" />
  </p>
 </p>
</body>
</html>
<script type="text/javascript">
 function Upload() {
  $("#id").uploadView({
   uploadBox: &#39;.js_uploadBox&#39;,//设置上传框容器
   showBox: &#39;.js_showBox&#39;,//设置显示预览图片的容器
   width: &#39;100&#39;, //预览图片的宽度，单位px
   height: &#39;100&#39;, //预览图片的高度，单位px
   allowType: ["gif", "jpeg", "jpg", "bmp", "png"], //允许上传图片的类型
   maxSize:1, //允许上传图片的最大尺寸，单位M
   success: function (e) {
    var l = $(".js_showBox img").attr("src");
    $("#hidTmp_ID").val(l);
   }
  });
 }
</script>

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代码前台看起来很简单。

实现的效果也还可以，不过这个保存的是base64的图片，插入数据库的时候我们一般都是保存xxxx.jpg 故需要实现一个方法

 /// <summary>
  /// base64转图片
  /// </summary>
  /// <returns></returns>
  public static string BaseToImg(string baseimg) {
   byte[] bt = Convert.FromBase64String(baseimg.Replace("data:image/jpeg;base64,", ""));
   string filepath = "ImgServer".GetAppsetting();
   string sqlurl = @"" + DateTime.Now.ToString("yyyyMMdd") + "\\";
   string sqlname = "" + DateTime.Now.ToString("yyyyMMddhhmmssmsfff") + ".jpg";
   if (!System.IO.File.Exists(filepath + sqlurl)) {
    System.IO.Directory.CreateDirectory(filepath + sqlurl);
    System.IO.File.WriteAllBytes(filepath + sqlurl + sqlname, bt);
   }
   return sqlurl + sqlname;
  }

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这里我是根据日期对文件夹分组了，并且保存到数据库。避免单个文件太大

效果图类似这样

这个同样也适用于手机上

总结

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