Tutorial on how to upload images without refreshing using php html5,

Tutorial on how to upload images without refreshing using php html5, _PHP tutorial

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Release： 2016-07-12 09:00:14

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php html5 tutorial for uploading images without refreshing,

This article introduces you to a new way to upload images, using HTML5's FileReader to read image files, and then convert the data Transmitted to the server and processed using PHP. The implementation process is as follows (with picture preview function)
Front-end html code upload,html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>上传</title>
<script type="text/javascript" src="js/jquery.min.js"></script>
<style>
.upload{
  width:300px;
  height:200px;
  position:relative;
}
.upload input[type='file']{
  position:absolute;
  width:70px;
  top:0;
  left:0;
  z-index:10;
  opacity:0;
  filter:alpha(opacity=0);
}
.upload input.selbutton{
  width:70px;
  height:30px;
  background:#cf001b;
  color:#FFF;
  font-size:14px;
  position:absolute;
  top:0;left:0;
  z-index:9;
  border:none;
  cursor:pointer;
}
.upload input.upbutton{
  width:70px;
  height:30px;
  background:#cf001b;
  color:#FFF;
  font-size:14px;
  position:absolute;
  top:50px;left:0;
  z-index:10;
  border:none;
  cursor:pointer;
}
</style>
</head>
<body>
<div class='upload'>
  <input type="file" name="file" />
  <input type="button" name="selbutton" class="selbutton" value="选择文件" />
  <input type="button" name="upbutton" class="upbutton" value="上传" />
</div>
<div class='previews'>
  <img src="#" class="image_thumb" alt="图片预览"/>
</div>
</body>
</html>

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The style is as shown below

Next is the js code

<script type="text/javascript">
  $(".upbutton").click(function(){
    //定义允许上传的图片格式 在前台就可以直接判断，不合法的格式将不会上传
   var filetype = ['jpg','jpeg','png','gif'];
   if($('.image').get(0).files){
      fi = $('.image').get(0).files[0]; //得到文件信息
      //判断文件格式是否是图片 如果不是图片则返回false
      var fname = fi.name.split('.');
      if(filetype.indexOf(fname[1].toLowerCase()) == -1){
        alert('文件格式不支持');
        return ;
      }
      //实例化h5的fileReader
      var fr = new FileReader();
      fr.readAsDataURL(fi); //以base64编码格式读取图片文件
      fr.onload = function(frev){
        pic = frev.target.result; //得到结果数据
      //开始上传之前，预览图片
 $('.image_thumb').attr('src',pic);
//使用ajax 利用post方式提交数据
        $.post(
          'handle.php',
          {
             message:pic,
            filename:fname[0],
            filetype:fname[1],
            filesize:fi.size
          },
          function(data){
            data = eval('('+data+')');
            if(data.code == 1 || data.code == 2){
              console.log('上传失败')
            }else if(data.code == 0){
              console.log('上传成功')
            }
          }
        );
      }
    }
  })
</script>

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Next is the PHP processing code handle.php

$imgtype = array(
  'gif'=>'gif',
  'png'=>'png',
  'jpg'=>'jpeg',
  'jpeg'=>'jpeg'
); //图片类型在传输过程中对应的头信息
$message = $_POST['message']; //接收以base64编码的图片数据
$filename = $_POST['filename']; //接收文件名称
$ftype = $_POST['filetype']; //接收文件类型
//首先将头信息去掉，然后解码剩余的base64编码的数据
$message = base64_decode(substr($message,strlen('data:image/'.$imgtype[strtolower($ftype)].';base64,')));
$filename = $filename.".".$ftype;
$furl = "D:/now/";
//开始写文件
$file = fopen($furl.$filename,"w");
if(fwrite($file,$message) === false){
  echo json_encode(array('code'=>1,'con'=>'failed'));
  exit;
}
echo json_encode(array('code'=>0,'con'=>$filename));

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The effect of selecting a file and clicking upload is as shown below

The above is the code for uploading the entire image. Of course, there are many areas that can be optimized for the PHP part, such as the file name part, which can be renamed to ensure that the file name after uploading with the same file name is different, etc. I just started using this upload method. I was inspired by Node.js for uploading, and then I tried to apply it to PHP. I didn't expect that the upload could be successful.

I hope you can also upload images according to this method.

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