js上傳和預覽圖片

測試在IE8,FF12.0和谷歌chrome都能用!javascript

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>By:DragonDean</title>
<script type="text/javascript">
//下面用於圖片上傳預覽功能
function setImagePreview(avalue) {
  var docObj=document.getElementById("doc");

  var imgObjPreview=document.getElementById("preview");
  if(docObj.files &&docObj.files[0])
  {
    //火狐下,直接設img屬性
    imgObjPreview.style.display = 'block';
    imgObjPreview.style.width = '150px';
    imgObjPreview.style.height = '180px';

    //火狐7以上版本不能用上面的getAsDataURL()方式獲取,須要一下方式
    imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
  }
  else
  {
    //IE下,使用濾鏡
    docObj.select();
    var imgSrc = document.selection.createRange().text;
    var localImagId = document.getElementById("localImag");
    //必須設置初始大小
    localImagId.style.width = "150px";
    localImagId.style.height = "180px";
    //圖片異常的捕捉,防止用戶修改後綴來僞造圖片
    try{
      localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
      localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
    }
    catch(e)
    {
      alert("您上傳的圖片格式不正確,請從新選擇!");
      return false;
    }
    imgObjPreview.style.display = 'none';
    document.selection.empty();
  }
  return true;
}

</script>
</head>
<body>
  <table width="100%" border="0" cellspacing="0" cellpadding="0">
    <tbody>
      <tr>
        <td height="101" align="center">
          <div id="localImag">html

            <img id="preview" src="http://pic.cnblogs.com/face/1023040/20160923152523.png" width="150" height="180" style="display: block; width: 150px; height: 180px;">java

          </div>
        </td>
      </tr>
      <tr>
        <td align="center" style="padding-top:10px;">chrome

          <input type="file" name="file" id="doc" style="width:150px;" onchange="javascript:setImagePreview();">測試

        </td>
      </tr>
    </tbody>
  </table>
</body>
</html>ui

  運行:spa

相關文章
相關標籤/搜索