Ajax+node js multer makes file upload function-JS Tutorial-php.cn

Ajax+node js multer makes file upload function

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Release： 2018-03-31 10:53:50

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This time I will bring you the function of Ajax+node js multer to make file upload, what are the notes of Ajax+node js multer to make file upload, the following are Let’s take a look at practical cases.

Description

As a node beginner, I have recently been working on a chat software that supports registration, login, online single and multi-person chat , sending emoticons, uploading and downloading various files, adding and deleting friends, saving chat records, switching notification sounds, switching background images, games and other functions, so the multer module was used. After various document searches and demo examples, a single file was finally successfully implemented. The upload function supports the uploading of most file formats and displays them on the web page at the same time. Wrong, it is based on the web version of WeChat.

To achieve the overall effect, it must be done with css and html. I am a front-end beginner and it is my first time to post a blog. I am really in a hurry. In the near future, the code will be put on github. Interested friends can take a look.

The code will be uploaded directly below, and it will be lightly abused

Configuration

InstallationInstall multer directly through the cmd command window

npm install multer -save

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Server code

//引入http
const http=require("http");
//引入express
const express=require("express");
//引入multer
const multer=require("multer");
//创建服务器，绑定监听端口
var app=express();
var server=http.createServer(app);
server.listen(8081);
//建立public文件夹，将HTML文件放入其中，允许访问
app.use(express.static("public"));
//文件上传所需代码
//设置文件上传路径和文件命名
var storage = multer.diskStorage({
  destination: function (req, file, cb){
    //文件上传成功后会放入public下的upload文件夹
    cb(null, './public/upload')
  },
  filename: function (req, file, cb){
    //设置文件的名字为其原本的名字，也可以添加其他字符，来区别相同文件，例如file.originalname+new Date().getTime();利用时间来区分
    cb(null, file.originalname)
  }
});
var upload = multer({
  storage: storage
});
//处理来自页面的ajax请求。single文件上传
app.post('/upload', upload.single('file'), function (req, res, next) {
  //拼接文件上传后的网络路径，
  var url = 'http://' + req.headers.host + '/upload/' + req.file.originalname;
  //将其发回客户端
  res.json({
    code : 1,
    data : url
  });
  res.end();
});

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Client code

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <!--依托于jquery-->
  <script src="js/jquery-1.11.3.js"></script>
</head>
<body>
  <p class="container">
    <label>file</label>
    <input type="file" name="file" id="file">
  </p>
<script>
      var file=$("#file")[0];
      //这里使用的是onchange事件，所以当你选择完文件之后，就触发事件上传
      file.onchange=function(){
        //创建一个FormDate
        var formData=new FormData();
        //将文件信息追加到其中
        formData.append('file',file.files[0]);
        //利用split切割，拿到上传文件的格式
        var src=file.files[0].name,
            formart=src.split(".")[1]; 
        //使用if判断上传文件格式是否符合                                                          
                                                              if(formart=="jpg"||formart=="png"||
        formart=="docx"||formart=="txt"||
        formart=="ppt"||formart=="xlsx"||
        formart=="zip"||formart=="rar"||
        formart=="doc"){
        //只有满足以上格式时，才会触发ajax请求
          $.ajax({
            url: '/upload',
            type: 'POST',
            data: formData,
            cache: false,
            contentType: false,
            processData: false,
            success: function(data){
            //上传成功之后，返回对象data         
              if(data.code>0){
                var src=data.data;
                    //利用返回值src 网络路径，来实现上传文档的下载    
                    if(formart=="docx"||formart=="txt"||formart=="doc"){
                    //结合css样式，实现显示图标
                  var className="docx";
                    //拼接html，生成到页面上去  
                  var msg=`<a href="${src}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><i class="${className}"></i></a>`;
                }else if(formart=="ppt"){
            //PPT 格式
                    className="ppt";
                  msg=`<a href="${src}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><i class="${className}"></i></a>`;
                }else if(formart=="xlsx"){
            //xlsx 格式
                    className="xlsx";
                  msg=`<a href="${src}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><i class="${className}"></i></a>`;
          }else if(formart=="zip"||formart=="rar"){
          //zip || rar 格式
                    className="zip";
                  msg=`<a href="${src}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><i class="${className}"></i></a>`;
                }else{
          //所有的图片格式      
                  msg=`<a href="javascript:;" rel="external nofollow" class="picCheck"><img src="${src}"></a>`;
                }
                // 这里将msg 追加到你要显示的区域 
              }
            } 
         //不满足上传格式时 
        }else{
          alert("文件格式不支持上传")
        }
      }
</script>
</body>
</html>

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!