In the tutorial, we show how to integrate NodeJS/Express with JQuery Ajax POST/GET requests and Bootstrap view.
Related posts:
– How to build NodeJS/Express Bootstrap views
– NodeJS/Express – save form data to MySQL using Sequelize ORM – Ajax JQuery + Bootstrap view
Contents
Goal
We create a NodeJS/Express project as below structure:
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/nodejs-express-jquery-ajax-bootstrap /node_modules /public /js getrequest.js postrequest.js /views 404.html index.html app.js package.json |
Run above NodeJS/Express application then does POST/GET requests:
Practice
Setting up NodeJS/Express project
Create folder: nodejs-express-bootstrap and init nodejs application.
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mkdir nodejs-express-jquery-ajax-bootstrap cd nodejs-express-jquery-ajax-bootstrap |
See prompts:
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nodejs-express-jquery-ajax-bootstrap>npm init This utility will walk you through creating a package.json file. It only covers the most common items, and tries to guess sensible defaults. See `npm help json` for definitive documentation on these fields and exactly what they do. Use `npm install <pkg>` afterwards to install a package and save it as a dependency in the package.json file. Press ^C at any time to quit. package name: (nodejs-express-jquery-ajax-bootstrap) version: (1.0.0) description: Integrate NodeJS Express with JQuery Ajax Post/Get requests and Bootstrap view entry point: (index.js) app.js test command: git repository: keywords: NodeJs, Express, Bootstrap, Jquery, Ajax author: grokonez.com license: (ISC) About to write to C:\Users\pc\Desktop\nodejs\nodejs-express-jquery-ajax-bootstrap\package.json: { "name": "nodejs-express-jquery-ajax-bootstrap", "version": "1.0.0", "description": "Integrate NodeJS Express with JQuery Ajax Post/Get requests and Bootstrap view", "main": "app.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "keywords": [ "NodeJs", "Express", "Bootstrap", "Jquery", "Ajax" ], "author": "grokonez.com", "license": "ISC" } Is this ok? (yes) yes |
Now we have an package.json file in folder nodejs-express-jquery-ajax-bootstrap with content as below:
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{ "name": "nodejs-express-jquery-ajax-bootstrap", "version": "1.0.0", "description": "Integrate NodeJS Express with JQuery Ajax Post/Get requests and Bootstrap view", "main": "app.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "keywords": [ "NodeJs", "Express", "Bootstrap", "Jquery", "Ajax" ], "author": "grokonez.com", "license": "ISC" } |
Installing Express
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$npm install express --save |
-> Check package.json file:
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{ "name": "nodejs-express-jquery-ajax-bootstrap", "version": "1.0.0", "description": "Integrate NodeJS Express with JQuery Ajax Post/Get requests and Bootstrap view", "main": "app.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "keywords": [ "NodeJs", "Express", "Bootstrap", "Jquery", "Ajax" ], "author": "grokonez.com", "license": "ISC", "dependencies": { "express": "^4.16.3" } } |
Implement Bootstrap views
./views/index.html file:
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<!DOCTYPE html> <html lang="en"> <head> <title>Spring Boot - AJAX POST GET Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <script src="/js/getrequest.js"></script> <script src="/js/postrequest.js"></script> </head> <body> <div class="container"> <div class="col-sm-4"> <h3>NodeJS/Express Post/Get Ajax</h3> <div> <form id="customerForm"> <div class="form-group"> <label for="firstname">FirstName:</label> <input type="text" class="form-control" id="firstname" placeholder="Enter FirstName"/> </div> <div class="form-group"> <label for="lastname">LastName:</label> <input type="text" class="form-control" id="lastname" placeholder="Enter LastName"/> </div> <button type="submit" class="btn btn-default">Submit</button> </form> </div> <div id="postResultDiv"> </div> <br> <div> <button id="allCustomers" type="button" class="btn btn-default">Customers</button> <div id="getResultDiv"> <ul class="list-group"> </ul> </div> </div> </div> </div> </body> </html> |
– ./views/404.html file:
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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body> <div class="jumbotron text-center"> <h1>404 Error!</h1> <p>PAGE NOT FOUND</p> </div> </body> </html> |
Implement JQuery Ajax requests
– For JQuery Ajax POST request, we implement a ./public/js/postrequest.js file:
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$( document ).ready(function() { // SUBMIT FORM $("#customerForm").submit(function(event) { // Prevent the form from submitting via the browser. event.preventDefault(); ajaxPost(); }); function ajaxPost(){ // PREPARE FORM DATA var formData = { firstname : $("#firstname").val(), lastname : $("#lastname").val() } // DO POST $.ajax({ type : "POST", contentType : "application/json", url : window.location + "api/customers/save", data : JSON.stringify(formData), dataType : 'json', success : function(customer) { $("#postResultDiv").html("<p>" + "Post Successfully! <br>" + "--->" + JSON.stringify(customer)+ "</p>"); }, error : function(e) { alert("Error!") console.log("ERROR: ", e); } }); // Reset FormData after Posting resetData(); } function resetData(){ $("#firstname").val(""); $("#lastname").val(""); } }) |
– For JQuery Ajax Get request, we implement a ./public/js/getrequest.js file:
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$( document ).ready(function() { // GET REQUEST $("#allCustomers").click(function(event){ event.preventDefault(); ajaxGet(); }); // DO GET function ajaxGet(){ $.ajax({ type : "GET", url : window.location + "api/customers/all", success: function(result){ $('#getResultDiv ul').empty(); var custList = ""; $.each(result, function(i, customer){ $('#getResultDiv .list-group').append(customer.firstname + " " + customer.lastname + "<br>") }); console.log("Success: ", result); }, error : function(e) { $("#getResultDiv").html("<strong>Error</strong>"); console.log("ERROR: ", e); } }); } }) |
Implement Express Routes
In main NodeJS app.js file, we implement Express routes:
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var express = require("express"); var app = express(); var router = express.Router(); var bodyParser = require('body-parser'); app.use(bodyParser.json()); app.use(express.static('public')); var path = __dirname + '/views/'; var customers = []; router.use(function (req,res,next) { console.log("/" + req.method); next(); }); app.get("/",function(req,res){ res.sendFile(path + "index.html"); }); app.post("/api/customers/save", function(req,res){ console.log('Post a Customer: ' + JSON.stringify(req.body)); var customer = {}; customer.firstname = req.body.firstname; customer.lastname = req.body.lastname; customers.push(customer); return res.send(customer); }); app.get("/api/customers/all", function(req,res){ console.log("Get All Customers"); return res.send(customers); }); app.use("/",router); app.use("*",function(req,res){ res.sendFile(path + "404.html"); }); app.listen(8081, function () { console.log('Example app listening on port 8081!') }) |
Run & Check results
Run NodeJS application then makes requests:
->Server’s Logs:
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>node app.js Example app listening on port 8081! /GET /GET Post a Customer: {"firstname":"Jack","lastname":"Davis"} Post a Customer: {"firstname":"Mary","lastname":"Taylor"} Post a Customer: {"firstname":"Peter","lastname":"Thomas"} Post a Customer: {"firstname":"Amos","lastname":"Nelson"} Post a Customer: {"firstname":"Craig","lastname":"White"} Post a Customer: {"firstname":"Laura","lastname":"Lewis"} Post a Customer: {"firstname":"Steven","lastname":"Harris"} Post a Customer: {"firstname":"Paul","lastname":"Moore"} Post a Customer: {"firstname":"Mary","lastname":"Cook"} Get All Customers |
Could you please explain the routing i.e. “api/customers/save” and “api/customers/all”?
If I try to change to change the route for post request to “api/customers/submit” in both the app.js file and postrequest.js file…it shows an error, what is the reason for this?
Hi Aruna,
Please give me more detail about the error logs?
Regards,
JSA