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php实现文件预览功能

2019-11-21 21:03:51
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上一篇博客是上传功能,本篇是上传后图片预览和更改:

代码如下:

1.yulan.php

<!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>无标题文档</title><style type="text/css">#yl{ width:200px; height:300px; background-image:url(images/timg1.jpg); background-size:200px 300px;}#file{ width:200px; height:300px; float:left; opacity:0;}</style></head><body><form id="sc" action="ylchuli.php" method="post" enctype="multipart/form-data" target="shangchuan">      <input type="hidden" name="tp" value="" id="tp" />    <div id="yl">    <input type="file" name="file" id="file" onchange="document.getElementById('sc').submit()" />  </div>      </form><iframe style="display:none" name="shangchuan" id="shangchuan"></iframe></body><script type="text/javascript">//回调函数,调用该方法传一个文件路径,改变背景图function showimg(url){  var div = document.getElementById("yl");  div.style.backgroundImage = "url("+url+")";    document.getElementById("tp").value = url;}</script></html>

2.ylchuli.php

<?phpif($_FILES["file"]["error"]){  echo $_FILES["file"]["error"];}else{  if(($_FILES["file"]["type"]=="image/jpeg" || $_FILES["file"]["type"]=="image/png")&& $_FILES["file"]["size"]<1024000)  {    $fname = "./images/".date("YmdHis").$_FILES["file"]["name"];          $filename = iconv("UTF-8","gb2312",$fname);        if(file_exists($filename))    {      echo "<script>alert('该文件已存在!');</script>";    }    else    {      move_uploaded_file($_FILES["file"]["tmp_name"],$filename);                  $delurl = iconv("UTF-8","gb2312",$_POST["tp"]);      unlink($delurl); //删除文件            echo "<script>parent.showimg('{$fname}');</script>";    }      }}

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