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Detailed explanation of how PHP uses ajax to implement asynchronous uploading of files (pictures)
Detailed explanation of how PHP uses ajax to implement asynchronous uploading of files (pictures)
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
本文为大家分享了ajax异步上传文件或图片功能的具体代码，供大家参考，具体内容如下
//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>
//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);
}
})
});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;
}
}
?>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()
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