php 異步上傳圖片幾種方法總結(jié)

要實現(xiàn)異步上傳圖片方法有常用的有二種,一種是利用iframe實現(xiàn),另一種是借助于ajax來實現(xiàn)一般用第三方插件了,上傳圖片form提交target到一個隱藏的iframe里,代碼如下 :

form action="upload.php" id="form1" name="form1" enctype="multipart/form-data" method="post" target="uploadIframe">  </form> <iframe name="uploadIframe" id="uploadIframe" style="display:none"></iframe>

然后后臺處理完上傳圖片邏輯后返回給前臺,利用ajax修改當前頁面DOM對象實現(xiàn)無刷新上傳圖片的友好功能,實例代碼如下:a.html

<form enctype="multipart/form-data" action="a.php" target="ifram_sign" method="POST"> <input name="submit" id="submit" value="" type="hidden"> <label>上傳文件: <input name="test_file" type="file" id="test_file" size="48"></label> <input type="image" value="立即上傳" id="submit_btn"> </form> <iframe name="ifram_sign" src="" frameborder="0" height="0" width="0" marginheight="0" marginwidth="0"></iframe>

PHP代碼如下:

<?php if ($_FILES["test_file"]["error"] > 0) { echo "Error: " . $_FILES["test_file"]["error"] . "<br />"; }//開源代碼phpfensi.com else { //這里的判斷圖片屬性的方法就不寫了。自己擴展一下。 $filetype=strrchr($_FILES["test_file"]["name"],"."); $filetype=substr($filetype,1,strlen($filetype)); $filename="img/".time("YmdHis").".".$filetype; move_uploaded_file($_FILES["test_file"]["tmp_name"],$filename); echo '<script >alert(1)</script>'; $return="parent.document.getElementByIdx_x('mpic".$pageset_id."').innerHTML='".$dataimgpath."'"; echo "<script >alert('上傳成功')</script>"; echo "<script>{$return}</script>"; } ?>

其實jquery ajax圖片異步上傳,HTML:

<!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" lang="en_US" xml:lang="en_US"> <head> <title>圖片異步上傳</title> </head> <script type="text/javascript" src="js/jquery.js"></script> <script type="text/javascript" src="js/index.js"></script> <link type="text/css" rel="stylesheet" href="css/index.css"> <body> <div class="frm"> <form name="uploadFrom" id="uploadFrom" action="upload.php" method="post" target="tarframe" enctype="multipart/form-data"> <input type="file" id="upload_file" name="upfile"> </form> <iframe src="" width="0" height="0" style="display:none;" name="tarframe"></iframe> </div> <div id="msg"> </div> </body> </html>

index.js,代碼如下:

$(function(){ $("#upload_file").change(function(){ $("#uploadFrom").submit(); }); }); function stopSend(str){ var im="<img src='upload/images/"+str+"'>"; $("#msg").append(im); }

upload.php

<?php $file=$_FILES['upfile']; $name=rand(0,500000).dechex(rand(0,10000)).".jpg"; move_uploaded_file($file['tmp_name'],"upload/images/".$name); //調(diào)用iframe父窗口的js 函數(shù) echo "<script>parent.stopSend('$name')</script>"; ?>