Upload Image Using AJAX In Node



Introduction
In this blog we see how we can upload image file using ajax.Here we be using FileReader for reading the selected file and then we send that file data to server side using ajax and on server side we read and save that as image on server.


Project Structure



Setup Folder
Open the command prompt and create new folder using following command
  • mkdir upload
Now change to the newly created folder by using folder command
  • cd upload

Setup Node In Folder
Now we have to setup node environment in the folder for our project.
We have to use the below command to setup node in our folder
  • npm init -y
This command will create a package.json file which indicates that node is initialized in folder.
The package.json file will look like this






Install Packages

Now we have to install the package required for building the application.

For installing packages we use npm install followed by package name.


  • npm install body-parser ejs express jquery

After installing package the package.json will look like this 






Add Folder
As you can see in the project structure above. 
Now we have to add a new folder in out project folder and name it views.
And in views folder add file and name it demo.ejs
  • demo.ejs
    • <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
    </head>
    <body>
    <nav class="navbar navbar-expand-lg navbar-light bg-light fixed-top">
    <a class="navbar-brand" href="#">UploadFile</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
    </button>
    </nav>
    <div class="nav justify-content-center">
    <div class="card nav justify-content-center" style="width: 18rem; margin-top:7%;">
    <div class="card-body text-center">
    <input type="file" name="file" id="file" accept="image/*" class="form-control"><br>
    <button type="button" class="btn btn-success" id="upload">uploadfile</button>
    </div>
    </div>
    </div>
    <br>
    <div class="nav justify-content-center img">
    </div>
    <script src="/jquery/jquery.js"></script>
    <script>
    $(document).ready(function(){
    var fileData;
    var myFile;
    $('#file').change(function(){
    var filereader = new FileReader();
    filereader.onload = function(event){
    fileData = event.target.result;
    };
    myFile = $('#file').prop('files')[0];
    console.log('myfile',myFile)
    filereader.readAsDataURL(myFile)
    });
    $('#upload').click(function(){
    $.ajax({
    method:"post",
    url:"/upload",
    dataType:"JSON",
    data:{'filename':myFile.name,'file':fileData},
    success:function(response){
    if(response.msg=="success"){
    alert('uploaded');
    $('#file').val('');
    $('.img').append('<img src="data:image/*;base64,'+response.data+'" style="width:300px;height:300px;margin:10px 10px 10px 10px;">')
    }
    },
    error:function(){
    alert('server error');
    }
    });
    });
    });
    </script>
    </body>
    </html>
    view raw demo.ejs hosted with ❤ by GitHub
Setup EntryPoint
We have to setup the entry point for our application.
Add a new file in our project folder and name it app.js.As show in the project folder
Now add the below code in that app.js
  • app.js
var express = require('express');
var bodyParser = require('body-parser');
var fs = require('fs');
var app = express();
app.set('view engine','ejs');
app.use(bodyParser.urlencoded({extended:true,limit:'50mb',parameterLimit:50000}));
app.use('/jquery',express.static(__dirname+'/node_modules/jquery/dist/'));
app.get('/',(req,res)=>{
res.render('demo');
});
app.post('/upload',(req,res)=>{
var path = __dirname+'/'+req.body.filename;
var image = req.body.file;
var data = image.split(',')[1];
fs.writeFileSync(path,data,{encoding:'base64'});
var temp = fs.readFileSync(path);
var buff = new Buffer(temp);
var base64data = buff.toString('base64');
res.json({msg:'success',data:base64data});
});
var port = process.env.port || 3000;
app.listen(port,()=>console.log('server run at port '+port));
view raw app.js hosted with ❤ by GitHub

Now open the pacakge.json file and in scripts add "start":"node app.js"
and in main change it to app.js from index.js.

 Download code from here

Watch Video Tutorial 

Comments

Post a Comment

Popular posts from this blog

How To Use Sequelize-Cli In Node

Image
Introduction   In this article we will see how to use sequelize-cli for creating table in our database.and how can we setup a relationship between two table using foreignKey using sequelize Project Structure Setup The Node Project Open the console and  type the below cmd to make a new directory.         # mkdir seqlcli Then change to that directory by typing below cmd.         # cd seqlcli Setup Node In Project Now  type the below cmd on console and that will generate the package.json file.       # npm init  It will ask you to provide the basic details related to the package.json file have like name,version,author etc. After the file is initialize we can build our node project. The file will have all the metadata related to our project. Install Packages Now we will install the package which are required for building our application. On console type  ...
Read more

Upload And Download File In Node

Image
Here we will use multer middleware for uploading file . Click the link to know what is  multer . Setup The Project Folder create a new folder using console/terminal. open console/terminal type mkdir followed by the folder name you want to give. change to that folder by typing cd  folder name. Setup Node For The Project now type npm init on console/terminal. the  npm init  will create a  package.json  file.But we can create it manually too. just open the folder and  add a new file  and name it  package.json  and then we can structure it the same way as its been structured when using  npm init . the package.json will look like this. now we will install packages for our project using npm install followed by package names we want to install. the following packages will be installed express ejs body-parser multer mongoose . this will generate a folder name node_modules wh...
Read more

Import CSV File Data Into MongoDB In Node

Image
Setup Folder Open the command prompt and create new folder using the following command followed by folder name. mkdir csv After creating the folder.Change to that folder by using the following command cd csv Setup Node In Folder To setup node in folder use the following command npm init -y This will setup node in our folder.And  after the execution of this command you will see package.json file which means node is initialised. This package.json file will contain the metadata related to our project. The package.json will look like this Install Packages Now we have to install packages to be used to build our application. To install packages we use the following command followed by package name.  npm install csvtojson express ejs mongoose multer body-parser  After installation package.json will look like this Add New Folders Add few new folders in our project folder  models public views Models Fold...
Read more