PHP中ajax無刷新上傳圖片與圖片下載功能

更新時間：2017年02月21日 17:13:09 作者：你說的在乎

本文給大家分享php ajax無刷新上傳圖片與圖片下載功能的實現(xiàn)代碼，非常不錯，具有參考借鑒價值，需要的的朋友參考下

php ajax無刷新上傳圖片與圖片下載功能的實現(xiàn)代碼如下所示：

<meta charset="utf-8" > 
    <form id= "uploadForm">  
       <p >指定文件名： <input type="text" name="filename" value= ""/></p >  
        <p> 
         上傳文件：  
         <input type="file" name="photo" onchange="showPreview(this)" class="file" /> 
         <img id="portrait" src="" width="70" height="75"> 
       </p>  
       <input type="button" value="上傳" onclick="doUpload()" />  
    </form>  
    <script src="http://www.haoyunyun.cn/jquery.js"></script> 
    <script> 
    function doUpload() {  
       var formData = new FormData($( "#uploadForm" )[0]);  
       $.ajax({  
         url: 'submit.php' ,  
         type: 'POST',  
         data: formData,  
         async: false,  
         cache: false,  
         contentType: false,  
         processData: false,  
         success: function (returndata) {  
           alert(returndata);  
         },  
         error: function (returndata) {  
           alert(returndata);  
         }  
       });  
    }  
    </script> 
    <script type="text/javascript"> 
    function showPreview(source) { 
      var file = source.files[0]; 
      if (window.FileReader) { 
        var fr = new FileReader(); 
        fr.onloadend = function(e) { 
          document.getElementById("portrait").src = e.target.result; 
        }; 
        fr.readAsDataURL(file); 
      } 
    } 
   </script>

submit.php

<?php 
  if($_FILES['photo']['error']>0){ 
    echo "上傳文件失敗"; 
    die; 
  } 
  $dir='./photo/'; 
  $type=substr($_FILES['photo']['name'],strrpos($_FILES['photo']['name'],'.')); 
  $filename=time().rand(1000,9999).$type; 
  if(is_uploaded_file($_FILES['photo']['tmp_name'])){ 
    move_uploaded_file($_FILES['photo']['tmp_name'],$dir.$filename); 
    echo "上傳成功"; 
  }else{ 
    echo "上傳文件失敗"; 
  }

遍歷數(shù)據(jù)庫數(shù)據(jù)

 <?php 
  header("content-type:text/html;charset=utf-8"); 
  $link=mysql_connect("127.0.0.1",'root','root'); 
  mysql_select_db("php9",$link); 
  mysql_query("set names utf8"); 
  //查詢數(shù)據(jù)中的總條數(shù) 
  $sql="select count(id) as count from upload"; 
  $arr=mysql_query($sql); 
  $result=mysql_fetch_assoc($arr); 
  //獲得總條數(shù) 
  $size=$result['count']; 
  //每頁顯示2條數(shù)據(jù) 
  $length=6; 
  //計算出多少頁 
  $pages=ceil($size/$length); 
  $page=isset($_GET['page'])?$_GET['page']:1; 
  if($page<=0){ 
    $page=1; 
  } 
  if($page>$pages){ 
    $page=$pages; 
  } 
  //數(shù)據(jù)從第幾條開始 
  $start=($page-1)*$length; 
  $sql="select * from upload limit $start,$length"; 
  $res=mysql_query($sql); 
  ?> 
  <center> 
  <table border="1"> 
    <div> 
      <?php 
      while($a=mysql_fetch_assoc($res)){ 
        ?> 
        <ul> 
          <li><?php echo $a['id'] ?></li> 
          <li><?php echo $a['username'] ?></li> 
          <li><a href="photo.php" rel="external nofollow" ><img src="<?php echo $a['dir'] ?>" width="80px" ></a> </li> 
          <li><?php echo $a['desc1'] ?></li> 
          <li> 
            <a href="photo3.php?dir=<?php echo $a['dir'] ?>" rel="external nofollow" >下載</a> 
            <a href="photo4.php?id=<?php echo $a['id'] ?> && dir=<?php echo $a['dir'] ?>" rel="external nofollow" >刪除</a> 
          </li> 
        </ul> 
      <?php 
      } 
      ?> 
    </div> 
  </table> 
              <a href="photo2.php?page=1" rel="external nofollow" >首頁</a> 
              <a href="photo2.php?page=<?php echo $page-1 ?>" rel="external nofollow" >上一頁</a> 
              <a href="photo2.php?page=<?php echo $page+1 ?>" rel="external nofollow" >下一頁</a> 
              <a href="photo2.php?page=<?php echo $pages ?>" rel="external nofollow" >尾頁</a> 
  </center> 
  <style> 
    *{ 
      margin: 0; 
      padding: 0; 
    } 
    div{ 
      width:900px; 
      height: 850px; 
      border: 1px solid #28a4c9; 
      margin: auto; 
    } 
    img{ 
      width: 200px; 
      height: 130px; 
      margin-left: 100px; 
    } 
    ul{ 
      width: 400px; 
      height: 300px; 
      float: left; 
    } 
    li{ 
      list-style: none; 
      margin-left: 10px; 
    } 
  </style>

下載代碼

 <?php 
  header("content-type:text/html;charset=utf-8"); 
  $dir=$_GET['dir']; 
  $filename=substr($dir,strrpos($dir,'/')+1); 
  header("Content-type:image"); 
  header("content-disposition:attachment;filename=$filename"); 
  readfile($dir); 
  ?>

以上所述是小編給大家介紹的PHP中ajax無刷新上傳圖片與圖片下載功能，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復(fù)大家的。在此也非常感謝大家對腳本之家網(wǎng)站的支持！

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