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Ajax

目前常用的异步文件上传功能有几种,比较多见的如使用iframe框架形式,ajax功能效果,以及flash+php功能,下面介绍ajax与iframe实现异步文件上传的功能的例子。

方法一,利用jquery ajaxfileupload.js实现文件上传

其实就是实现无刷新式的文件上传。可采用IFRAME文件上传原理。
实际上在用PHP上传文件时。。。只能用$_FILES形式,但是若我们只是单一的用JS方式取其ID,如..document.getElementById('img').value或者jquery形式的$("#img")都是不能正真实际上传的(但是还是有很多人这样做,刚开始时我也是)。
可是功能上又要要求实现所谓的“异步上传”,怎么办呢?只能借助于第三方的组件,或者自己写一个(在网页里嵌入一个IFRAME)。但如果是考虑开发时间,建议用第三方的,这里有一个不错的jQuery 的Ajax文件上传的组件,即“ajaxfileupload.js",其组件下载地址为:http://files.bitsCN.com/file_images/article/201306/js/ajaxfileupload.js

过程:

(1 )前端文件的代码: test.php

复制代码 代码如下:
 
 

相应的HTML为:

 
 

这样客户端就完成了。

(2) 在服务器端的doajaxfileupload.php

此处为了简便的检测是否真正的传值过来了,你可以将它存起来了。

复制代码 代码如下:$file_infor = var_export($_FILES,true);
 file_put_contents("d:file_infor.php".$file_infor);

 这样你打来刚生成的file_infor.php文件时,你又看到了熟悉的信息了:

复制代码 代码如下:array(
 'name'=>'lamp.jpg',
 'type'=>'image/pjpeg',
 'tmp_name'=>'c:windowstempphpFA.tmp',
 'error'=>0,
 'size'=>3127
)

当然,真正的处理类于这样的:

复制代码 代码如下:  $upFilePath = "d:/";
  $ok=@move_uploaded_file($_FILES['img']['tmp_name'],$upFilePath);
if($ok === FALSE){
 echo json_encode('file_infor'=>'上传失败');
}else{
 echo json_encode('file_infor'=>'上传成功');
}
?>

方法二,利用iframe框架上传图片

html代码如下:

复制代码 代码如下:


 

  
 

 
 

 

 

index.js文件:

复制代码 代码如下:$(function(){
 $("#upload_file").change(function(){
   $("#uploadFrom").submit();
 });
});
function stopSend(str){
 var im="php+ajax实现图片文件上传功能实例_PHP";
 $("#msg").append(im);
}

upload.php文件:

复制代码 代码如下: $file=$_FILES['upfile'];
 $name=rand(0,500000).dechex(rand(0,10000)).".jpg";
 move_uploaded_file($file['tmp_name'],"upload/images/".$name);
//调用iframe父窗口的js 函数
 echo "<script>parent.stopSend('$name')</script>";
?>

方法三,原生态ajax文件上传

复制代码 代码如下:



    Html5 Ajax 上传文件
   





   
   

   
    浏览...
   
    上传



php代码:

复制代码 代码如下:
if(isset($_FILES["myfile"]))
{
$ret = array();
$uploadDir = 'images'.DIRECTORY_SEPARATOR.date("Ymd").DIRECTORY_SEPARATOR;
$dir = dirname(__FILE__).DIRECTORY_SEPARATOR.$uploadDir;
file_exists($dir) || (mkdir($dir,0777,true) && chmod($dir,0777));
if(!is_array($_FILES["myfile"]["name"])) //single file
{
$fileName = time().uniqid().'.'.pathinfo($_FILES["myfile"]["name"])['extension'];
move_uploaded_file($_FILES["myfile"]["tmp_name"],$dir.$fileName);
$ret['file'] = DIRECTORY_SEPARATOR.$uploadDir.$fileName;
}
echo json_encode($ret);
}
?>

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