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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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