上传预览图片

来源：互联网发布：爱伦坡乌鸦知乎编辑：程序博客网时间：2024/06/10 05:37

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>My JSP 'add.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

<script type="text/javascript">

                //图片上传预览    IE是用了滤镜。
        function previewImage(file)
        {
          var MAXWIDTH = 100;
          var MAXHEIGHT = 100;
          var div = document.getElementById('preview');
          if (file.files && file.files[0])
          {
              div.innerHTML ='<img id=imghead>';
              var img = document.getElementById('imghead');
              img.onload = function(){
                var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
                img.width = rect.width;
                img.height = rect.height;
//                 img.style.marginLeft = rect.left+'px';
                img.style.marginTop = rect.top+'px';
              }
              var reader = new FileReader();
              reader.onload = function(evt){img.src = evt.target.result;}
              reader.readAsDataURL(file.files[0]);
          }
          else //兼容IE
          {
            var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
            file.select();
            var src = document.selection.createRange().text;
            div.innerHTML = '<img id=imghead>';
            var img = document.getElementById('imghead');
            img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
            status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
            div.innerHTML = "<div id=divhead style='width:"+rect.width+"px;height:"+rect.height+"px;margin-top:"+rect.top+"px;"+sFilter+src+"\"'></div>";
          }
        }
        function clacImgZoomParam( maxWidth, maxHeight, width, height ){
            var param = {top:0, left:0, width:width, height:height};
            if( width>maxWidth || height>maxHeight )
            {
                rateWidth = width / maxWidth;
                rateHeight = height / maxHeight;

                if( rateWidth > rateHeight )
                {
                    param.width = maxWidth;
                    param.height = Math.round(height / rateWidth);
                }else
                {
                    param.width = Math.round(width / rateHeight);
                    param.height = maxHeight;
                }
            }

            param.left = Math.round((maxWidth - param.width) / 2);
            param.top = Math.round((maxHeight - param.height) / 2);
            return param;
        }
</script>
</head>

<body>
<h1 align="center">添加房屋信息</h1>
    <table align="center" border="1px">
    <tr align="center">
      <td>

         <form action="${pageContext.request.contextPath}/main/insert" enctype="multipart/form-data" method="post">
        房屋名称：<input type="text" name="house_name"><br>
        房屋单价：<input type="text" name="house_price"><br>
        房屋面积：<input type="text" name="house_area"><br>
        房屋图片：<input type="file" name="file" id="file" onchange="previewImage(this)"> <div id="preview"></div><br>
        所属户主：<select name="person.pid">
         <c:forEach var="p" items="${listP }">
       <option value="${p.pid }">${p.person_name }</option>
      </c:forEach>
        </select><br>
        <input type="submit" value="保存">
       </form>
      </td>
    </tr>
    </table>
</body>
</html>

阅读全文

0 0