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Home Backend Development PHP Tutorial How to use php+ajax to asynchronously upload files or pictures

How to use php+ajax to asynchronously upload files or pictures

May 19, 2018 am 11:25 AM
php php+ajax picture

这篇文章主要为大家详细介绍了php+ajax实现异步上传文件或图片功能,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

//html代码

<form enctype="multipart/form-data" id="upForm">
 <input type="file" name="file" ><br><br>
 <input type="button" value="提交">
</form>
<p class="picDis">
 <img src="" alt="">
</p>
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//js代码

(':button').click(function(event) {
  //formdata储存异步上传数据
 var formData = new FormData($('form')[0]);
 formData.append('file',$(':file')[0].files[0]);
 //坑点: 无论怎么传数据,console.log(formData)都会显示为空,但其实值是存在的,f12查看Net tab可以看到数据被上传了
 $.ajax({
  url:'formtest.php',
  type: 'POST',
  data: formData,
  //这两个设置项必填
  contentType: false,
  processData: false,
  success:function(data){
  console.log(data)
  var srcPath = data;
  console.log();
     //注意这里的路径要根据自己的储存文件的路径设置
  $('.picDis img').attr('src', '..'+srcPath);
  }
 })
 });
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php:

<?php 

$upFile = $_FILES['file'];

/**
* 创建文件夹函数,用于创建保存文件的文件夹
* @param str $dirPath 文件夹名称
* @return str $dirPath 文件夹名称
*/
function creaDir($dirPath){
 $curPath = dirname(__FILE__);
 $path = $curPath.'\\'.$dirPath;
 if (is_dir($path) || mkdir($path,0777,true)) {
  return $dirPath;
 }
}

//判断文件是否为空或者出错
if ($upFile['error']==0 && !empty($upFile)) {
 $dirpath = creaDir('upload');
 $filename = $_FILES['file']['name'];
 $queryPath = './'.$dirpath.'/'.$filename;
 //move_uploaded_file将浏览器缓存file转移到服务器文件夹
 if(move_uploaded_file($_FILES['file']['tmp_name'],$queryPath)){
  echo $queryPath;
 }
}

 ?>
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点击上传图片并发送后, 可以看到页面上显示出图片, 查看本地文件夹可以看到文件也已储存到服务器.

在客户端实现异步上传的关键在于FormData,关于这部分这里有详细介绍: FormData()

以上就是本文的全部内容,希望对大家的学习有所帮助。

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