javascript - ajax upload file background uses $_files to accept empty-PHP Tutorial-php.cn

javascript - ajax upload file background uses $_files to accept empty

不言

Release： 2023-03-01 07:34:01

Original

2769 people have browsed it

javascript code:

<html><head><meta charset="UTF-8">
<style>
img{
   max-width:80%;
   display:block;
}
</style>
</head><body><input id="img" type="file">
<p id="text"></p>
<script>
var 
up=function(o,success,x,file){
   if(typeof success==&#39;function&#39;)
   file=o;
   x=new XMLHttpRequest()
   x.open(&#39;POST&#39;,&#39;http://127.0.0.1/up.php?r=&#39;+Math.random(),1)

   x.onload=function(r){
       r=x.responseText
       if(success)//if r.pid and the twice parameter existing
           return success(r)
   }
   x.send(file)
}
</script>
<script>
img.onchange=function(){
   if(!this.files||!this.files[0])
       return alert(&#39;选取文件出错！&#39;)

   var 
   imgfile=this.files[0]

   if(imgfile.type.indexOf(&#39;image&#39;)!=0)
       return alert(&#39;这不是一个图像或音频！&#39;)
   
   up(imgfile,function(r){
       text.innerHTML=r

   })
}
</script>
</body>
</html>

Copy after login

Backend code:

<?php
  header(&#39;Access-Control-Allow-Origin:*&#39;);
  header("Content-Type:text/json;charset=utf-8");
  echo json_encode($_FILES); 
  ?>

Copy after login

The return data is []

Reply content:

javascript code:

<html><head><meta charset="UTF-8">
<style>
img{
   max-width:80%;
   display:block;
}
</style>
</head><body><input id="img" type="file">
<p id="text"></p>
<script>
var 
up=function(o,success,x,file){
   if(typeof success==&#39;function&#39;)
   file=o;
   x=new XMLHttpRequest()
   x.open(&#39;POST&#39;,&#39;http://127.0.0.1/up.php?r=&#39;+Math.random(),1)

   x.onload=function(r){
       r=x.responseText
       if(success)//if r.pid and the twice parameter existing
           return success(r)
   }
   x.send(file)
}
</script>
<script>
img.onchange=function(){
   if(!this.files||!this.files[0])
       return alert(&#39;选取文件出错！&#39;)

   var 
   imgfile=this.files[0]

   if(imgfile.type.indexOf(&#39;image&#39;)!=0)
       return alert(&#39;这不是一个图像或音频！&#39;)
   
   up(imgfile,function(r){
       text.innerHTML=r

   })
}
</script>
</body>
</html>

Copy after login

Backend code:

 <?php
  header(&#39;Access-Control-Allow-Origin:*&#39;);
  header("Content-Type:text/json;charset=utf-8");
  echo json_encode($_FILES); 
  ?>

Copy after login

The return data is []

Asynchronously upload files, you should use FormData. For example:

var oMyForm = new FormData();
oMyForm.append("file", file);
x.send(oMyForm);

Copy after login

Php8, I'm coming too

Learn website layout in 30 minutes

Shangguan Oracle Beginner to Proficient Video Tutorial

Your first line of UNI-APP code

Flutter from scratch to app launch

Brother Lian New Linux Video Tutorial

AXURE 9 Video Tutorial (Suitable for Product Manager Interactive Product Design UI)

Zero Basic Proficiency PS Video Tutorial

16 day UI video tutorial to get you started

PS Techniques and Slicing Techniques Video Tutorial

Alibaba Cloud Environment Construction and Project Launch Video Tutorial

Overview of Computer Networks - Basic Knowledge that Programmers Must Master

Essential Tutorial for Programmers - HTTP Protocol Explanation

Websocket Video Tutorial

javascript - ajax upload file background uses $_files to accept empty