NODEJS

ch-1 nodejs core intro and setups

1.npm --version

2.npm install -g nodemon

ch-2 nodejs core api algorithyms

1.console.log("welcome node");

->cd desktop

node index.js

2.console.log("welcome node");

->cd desktop

nodemon index

3.var x="saurav";

console.log(x);

4.if(6 == 6)

{

console.log("success");

}

5.const http = require("http");

const server = http.createServer((request,response)=>{

response.write("saurav");

response.end();

});

server.listen(8080);

->localhost:8080

6.const http = require("http");

const server = http.createServer((request,response)=>{

//operation

const date = new Date();

const current_date = date.toLocaleDateString();

//header info

response.writeHead(200,{

'Content-Type': 'application/json'

});

//response in json format

const result={

current_date:current_date

};

const string_data = JSON.stringify(result);

response.write(string_data);

//disconnect user

response.end();

});

server.listen(8080);

7.const http = require("http");

console.log(http.STATUS_CODES);

8.<body>

<script>

const date = new Date();

const current_date=date.toLocaleDateString();

alert(current_date);

</script>

</body>

ch-3 nodejs core handling http requests

1.const http = require("http");

const server = http.createServer((request,response)=>{

response.write("success");

response.end();

});

server.listen(8080);

2.const http = require("http");

const query=require("querystring");

const server = http.createServer((request,response)=>{

var userData="";

request.on('data',(chunks)=>{

userData+=chunks.toString();

});

request.on('end',()=>{

const data=query.parse(userData);

response.write(data.name);

response.end();

});

server.listen(8080);

3.const http = require("http");

const query=require("querystring");

const server = http.createServer((request,response)=>{

var userData="";

request.on('data',(chunks)=>{

userData+=chunks.toString();

});

request.on('end',()=>{

const data=query.parse(userData);

var username=data.username;

var password=data.password;

if(username == "saurav" && password == 12345)

{

response.writeHead(200,{

'Content-Type':'application/json'

});

const successMessage=JSON.stringify({

message:"user authenticated"

});

response.write(successMessage);

}

else{

response.writeHead(401,{

'Content-Type':'application/json'

});

const errorMessage=JSON.stringify({

message:"user unauthenticated"

});

response.write(errorMessage);

}

response.end();

});

server.listen(8080);

ch-4 nodejs core html and ajax cors request

1.http://localhost:8080?username=saurav&password=12345

=>const http = require("http"); const query=require("querystring"); const server = http.createServer((request,response)=>{ var userData = query.parse(request.url.replace("/?","")); console.log(userData.username); response.end(); }); server.listen(8080);

=>const http = require("http"); const query=require("querystring"); const server = http.createServer((request,response)=>{ response.write(request.method); response.end(); }); server.listen(8080);

2.<body> <form method="GET" action="http://localhost:8080"> username<br><br> <input name="username"> <br><br> password<br><br> <input name="password" type="password"> <br><br> <button type="submit">login</button> </form> </body>

3.<body> <form method="POST" action="http://localhost:8080"> username<br><br> <input name="username"> <br><br> password<br><br> <input name="password" type="password"> <br><br> <button type="submit">login</button> </form> </body>

=>const http = require("http"); const query=require("querystring"); const server = http.createServer((request,response)=>{ if(request.method == "GET") { var userData = query.parse(request.url.replace("/?","")); var username=userData.username; var password=userData.password; if(username == "saurav" && password== 12345) { response.writeHead(200,{ 'Content-Type':'application/json' }); const successMessage=JSON.stringify({ message:"user authenticated" }); response.write(successMessage); } else{ response.writeHead(401,{ 'Content-Type':'application/json' }); const errorMessage=JSON.stringify({ message:"user unauthenticated" }); response.write(errorMessage); } response.end(); } else{ var postdata=""; request.on("data",(chunks)=>{ postdata+=chunks.toString(); }); request.on("end",()=>{ const user=query.parse(postdata); var username=user.username; var password=user.password; if(username=="saurav" && password==12345) { response.writeHead(200,{ 'Content-Type':'application/json' }); const successMessage=JSON.stringify({ message:"user authenticated" }); response.write(successMessage); } else{ response.writeHead(401,{ 'Content-Type':'application/json' }); const errorMessage=JSON.stringify({ message:"user unauthenticated" }); response.write(errorMessage); } response.end(); }); } }); server.listen(8080);

4.<body> <form id="form"> username<br><br> <input name="username" id="username"> <br><br> password<br><br> <input name="password" type="password" id="password"> <br><br> <button type="submit">login</button> </form> <script> const form=document.querySelector("#form"); form.onsubmit=function(){ var username=document.querySelector("#username").value; var password=document.querySelector("#password").value; var url="http://localhost:8080?username="+username+"&password="+password; const ajax=new XMLHttpRequest(); ajax.open("GET",url,true); ajax.send(); //getting response ajax.onreadystatechange=()=>{ if(ajax.readyState == 4) { console.log(ajax.responseText); } } return false; } </script> </body>

=>const http = require("http"); const query=require("querystring"); const server = http.createServer((request,response)=>{ if(request.method == "GET") { var userData = query.parse(request.url.replace("/?","")); var username=userData.username; var password=userData.password; if(username == "saurav" && password== 12345) { response.writeHead(200,{ 'Content-Type':'application/json', 'Access-Control-Allow-Origin':'*' }); const successMessage=JSON.stringify({ message:"user authenticated" }); response.write(successMessage); } else{ response.writeHead(401,{ 'Content-Type':'application/json', 'Access-Control-Allow-Origin':'*' }); const errorMessage=JSON.stringify({ message:"user unauthenticated" }); response.write(errorMessage); } response.end(); } else{ var postdata=""; request.on("data",(chunks)=>{ postdata+=chunks.toString(); }); request.on("end",()=>{ const user=query.parse(postdata); var username=user.username; var password=user.password; if(username=="saurav" && password==12345) { response.writeHead(200,{ 'Content-Type':'application/json', 'Access-Control-Allow-Origin':'*' }); const successMessage=JSON.stringify({ message:"user authenticated" }); response.write(successMessage); } else{ response.writeHead(401,{ 'Content-Type':'application/json', 'Access-Control-Allow-Origin':'*' }); const errorMessage=JSON.stringify({ message:"user unauthenticated" }); response.write(errorMessage); } response.end(); }); } }); server.listen(8080);

5.<body> <form id="form"> username<br><br> <input name="username" id="username"> <br><br> password<br><br> <input name="password" type="password" id="password"> <br><br> <button type="submit">login</button> </form> <script> const form=document.querySelector("#form"); form.onsubmit=function(){ var username=document.querySelector("#username").value; var password=document.querySelector("#password").value; var url="http://localhost:8080"; const ajax=new XMLHttpRequest(); ajax.open("POST",url,true); ajax.send("username="+username+"&password="+password); //getting response ajax.onreadystatechange=()=>{ if(ajax.readyState == 4) { console.log(ajax.responseText); } } return false; } </script> </body>

=>const http = require("http"); const query=require("querystring"); const server = http.createServer((request,response)=>{ if(request.method == "GET") { var userData = query.parse(request.url.replace("/?","")); var username=userData.username; var password=userData.password; if(username == "saurav" && password== 12345) { response.writeHead(200,{ 'Content-Type':'application/json', 'Access-Control-Allow-Origin':'*' }); const successMessage=JSON.stringify({ message:"user authenticated" }); response.write(successMessage); } else{ response.writeHead(401,{ 'Content-Type':'application/json', 'Access-Control-Allow-Origin':'*' }); const errorMessage=JSON.stringify({ message:"user unauthenticated" }); response.write(errorMessage); } response.end(); } else{ var postdata=""; request.on("data",(chunks)=>{ postdata+=chunks.toString(); }); request.on("end",()=>{ const user=query.parse(postdata); var username=user.username; var password=user.password; if(username=="saurav" && password==12345) { response.writeHead(200,{ 'Content-Type':'application/json', 'Access-Control-Allow-Origin':'*' }); const successMessage=JSON.stringify({ message:"user authenticated" }); response.write(successMessage); } else{ response.writeHead(401,{ 'Content-Type':'application/json', 'Access-Control-Allow-Origin':'*' }); const errorMessage=JSON.stringify({ message:"user unauthenticated" }); response.write(errorMessage); } response.end(); }); } }); server.listen(8080);

ch-5 nodejs core intro to mongodb and setups

1.mongo --version

ch-6 nodejs core mongodb transactions

1.npm install mongodb

2.mongo

3.cd desktop

Desktop>cd mongo

Desktop\mongo>cd backend

Desktop\mongo\backend>nodemon create_db

4.const http=require("http"); const mongo=require("mongodb").MongoClient; const server=http.createServer((request,response)=>{ var url="mongodb://127.0.0.1:27017"; mongo.connect(url,(error,conn)=>{ if(error) throw error; const db=conn.db("wap"); db.createCollection("result",(error,collection)=>{ if(error) { if(error.code == 48) { response.writeHead(409,{ 'Content-Type':'application/json' }); const dupMessage=JSON.stringify({ message:"duplicate collection" }); response.write(dupMessage); response.end(); } } else{ const data={ name:"er saurav", roll:12, subject:"maths", marks:"80%" }; db.collection("result").insertOne(data,(error,dataRes)=>{ if(error) throw error; //success response.writeHead(200,{ 'Content-Type':'application/json' }); const successMessage=JSON.stringify({ message:dataRes }); response.write(successMessage); response.end(); }); } }); }); }); server.listen(8080);

5.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

var url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

if(error)

throw error;

const data={

name:"gautam",

roll:215,

subject:"maths",

marks:"80%"

};

const db=conn.db("wap");

db.collection("result").insertOne(data,(error,dataRes)=>{

if(error)

throw error;

response.writeHead(200,{

'Content-Type':'application/json'

});

const successMessage=JSON.stringify({

message:dataRes

});

response.write(successMessage);

response.end();

});

server.listen(8080);

ch-7 nodejs core mongodb insert and find

1.cd desktop/mongo/backend

2.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const data={

name:"saurava",

roll:1234

};

const db=conn.db("wap");

db.collection("result").find(data).toArray((error,result)=>{

if(result.length == 0)

{

db.collection("result").insertOne(data,(error,dataRes)=>{

response.writeHead(200,{

'Content-Type':'application/json'

});

const successMessage=JSON.stringify({

message:"insert success"

});

response.write(successMessage);

response.end();

});

}

else{

response.writeHead(409,{

'Content-Type':'application/json'

});

const failedMessage=JSON.stringify({

message:"duplicate entry"

});

response.write(failedMessage);

response.end();

}

});

server.listen(8080);

3.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const data=[

{

name:"a",

roll:123

{

name:"b",

roll:123

{

name:"c",

roll:123

}

];

db.collection("result").insert(data,(error,dataRes)=>{

console.log(dataRes);

});

server.listen(8080);

4.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

db.collection("result").find(null,{

projection:{

_id:1,

name:0,

roll:0

}

}).toArray((error,data)=>{

console.log(data);

});

server.listen(8080);

ch-8 nodejs core mongodb operators

1.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const query={

id:89

};

const fieldControl={

projection:{

id:0,

_id:0,

userId:0,

title:0,

}

};

db.collection("posts")

.find(null,fieldControl)

.limit(2)

.toArray((error,data)=>{

console.log(data);

response.end();

});

server.listen(8080);

2.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const query={

id:{

$gt:90,

$lt:100

}

};

const fieldControl={

projection:{

id:0,

_id:0,

userId:0,

title:0,

}

};

db.collection("posts")

.find(query)

.toArray((error,data)=>{

console.log(data);

response.end();

});

server.listen(8080);

3.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const query={

title:{

$regex:/^con/

}

};

const fieldControl={

projection:{

id:0,

_id:0,

userId:0,

title:0,

}

};

db.collection("posts")

.find(query)

.toArray((error,data)=>{

console.log(data);

response.end();

});

server.listen(8080);

4.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const query={

id:{

$gt:1

title:{

$regex:/^con/i

body:{

$regex:/^vol/i

}

};

const fieldControl={

projection:{

id:0,

_id:0,

userId:0,

title:0,

}

};

db.collection("posts")

.find(query)

.toArray((error,data)=>{

if(data == 0)

{

console.log("data not found");

}

else{

console.log(data);

}

response.end();

});

server.listen(8080);

5.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const query={

id:{

$in:[80,99,100,98]

};

const fieldControl={

projection:{

id:0,

_id:0,

userId:0,

title:0,

}

};

db.collection("posts")

.find(query)

.toArray((error,data)=>{

if(data == 0)

{

console.log("data not found");

}

else{

console.log(data);

}

response.end();

});

server.listen(8080);

6.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const query={

title:{

$eq:"quas fugiat ut perspiciatis vero provident"

};

const fieldControl={

projection:{

id:0,

_id:0,

userId:0,

title:0,

}

};

db.collection("posts")

.find(query)

.toArray((error,data)=>{

if(data == 0)

{

console.log("data not found");

}

else{

console.log(data);

}

response.end();

});

server.listen(8080);

7.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const query={

$and:[

{username:"saurav@gmail.com"},

{password:12345}

]

};

const fieldControl={

projection:{

id:0,

_id:0,

userId:0,

title:0,

}

};

db.collection("users")

.find(query)

.toArray((error,data)=>{

if(data == 0)

{

console.log("login failed");

}

else{

console.log(data);

}

response.end();

});

server.listen(8080);

=>[

{

"username":"saurav@gmail.com",

"password":12345

{

"username":"gautam@gmail.com",

"password":58963

}

]

ch-9 nodejs core mongodb delete and update

1.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

db.collection("products").find().toArray((error,data)=>{

console.log(data);

response.end();

});

server.listen(8080);

=>[

{

"id": 1,

"product_name": "soap",

"price": 200,

"purchased_at": "2020-06-05"

{

"id": 2,

"product_name": "laptop",

"price": 20000,

"purchased_at": "2020-06-08"

{

"id": 3,

"product_name": "speaker",

"price": 500,

"purchased_at": "2020-06-11"

}

]

2.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

db.collection("products").find().count((error,length)=>{

console.log(length);

response.end();

})

});

server.listen(8080);

3.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const desc={

price:-1

};

db.collection("products").find().sort(desc).toArray((error,data)=>{

console.log(data);

response.end();

});

server.listen(8080);

4.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const desc={

purchased_at:-1

};

db.collection("products").find().sort(desc).toArray((error,data)=>{

console.log(data);

response.end();

});

server.listen(8080);

5.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const query={

id:2

};

const updateData={

$set:{

product_name:"printer",

price:14000

}

};

db.collection("products").updateOne(query,updateData,(error,checkUpdate)=>{

if(error)

throw error;

console.log("update success");

response.end();

});

server.listen(8080);

6.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const query={

id:2,

price:500

};

const updateData={

$set:{

product_name:"desktop",

price:20000

}

};

db.collection("products").updateMany(query,updateData,(error,checkUpdate)=>{

if(error)

throw error;

console.log("update success");

response.end();

});

server.listen(8080);

7.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

const query={

price:500

};

db.collection("products").deleteOne(query,(error,deleteRes)=>{

if(error)

throw error

console.log("success");

response.end();

});

server.listen(8080);

8.const http=require("http");

const mongo=require("mongodb").MongoClient;

const server=http.createServer((request,response)=>{

const url="mongodb://127.0.0.1:27017";

mongo.connect(url,(error,conn)=>{

const db=conn.db("wap");

db.collection("products").drop((error,colDrop)=>{

if(error)

throw error;

console.log("success");

response.end();

});

server.listen(8080);

ch-10 nodejs core mongodb shell

1.mongo

2.show dbs

3.use wap

db.posts.find()

db.posts.find().pretty()

4.db.posts.find({id:1}).pretty()

5.db.employee.insert({id:1,name:"saurav",salary:2000})

db.employee.find().pretty()

6.db.employee.insertMany([{id:2,name:"a",salary:2000},{id:3,name:"b",salary:3000}])

db.employee.find().pretty()

7.db.employee.deleteOne({id:2})

8. db.employee.deleteMany({id:2})

9.db.employee.drop()

10.show collections

11.db.posts.updateOne({id:1},{$set:{title:"testing"}})

12.db.posts.updateMany({id:1},{$set:{title:"welcome"}})

13.db.students.insertMany([

{

"class":1,

"students":[

{

"name":"saurav",

"roll":1

{

"name":"gaurav",

"roll":2

{

"name":"ravi",

"roll":3

}

]

{

"class":2,

"students":[

{

"name":"raman",

"roll":1

{

"name":"aman",

"roll":2

}

]

}

])

=>db.students.find().pretty()

=>db.students.find().limit(1).pretty()

14.db.students.aggregate({$project:{_id:0,class:0}}).pretty()

15.db.students.aggregate([{$project:{_id:0}},{$match:{class:1}}]).pretty()

16.db.students.aggregate([{$match:{class:1}},{$project:{_id:0,class:0}}]).pretty()

17.db.students.find({class:1},{students:1}).pretty()

18.db.students.find({class:1},{students:1,_id:0}).pretty()

19.db.students.find({class:1},{"students.name":1,_id:0}).pretty()

20.db.students.find()

use wap

db.students.find().pretty()

21.db.students.updateOne({class:1},{$push:{students:{name:"riya",roll:32}}})

22.db.students.updateOne({class:1},{$push:{status:"active"}})

23.db.posts.find({id:4}).pretty()

24.db.posts.createIndex({id:4})

25.db.posts.find({id:4}).pretty()

26.db.posts.dropIndex({id:4})

ch-11 nodejs core html css js routing

=>insert.js

const http=require("http");

const fs=require("fs");

const route=(path,response,status_code,type)=>{

fs.readFile(path,(error,data)=>{

response.writeHead(status_code,{

'Content-Type':type

});

response.write(data);

return response.end();

});

}

const server=http.createServer((request,response)=>{

//html page routing

if(request.url == "/" || request.url == "/home" || request.url == "/homepage")

{

let type="text/html";

let status_code=200;

let path="html/homepage.html";

route(path,response,status_code,type);

}

else if(request.url == "/about" || request.url == "/about-us")

{

let type="text/html";

let status_code=200;

let path="html/about-us.html";

route(path,response,status_code,type);

}

else if(request.url == "/contact" || request.url == "/contact-us")

{

let type="text/html";

let status_code=200;

let path="html/contact-us.html";

route(path,response,status_code,type);

}

//css page routing

else if(request.url == "/css/homepage.css")

{

let type="text/css";

let status_code=200;

let path="css/homepage.css";

route(path,response,status_code,type);

}

else if(request.url == "/css/contact-us.css")

{

let type="text/css";

let status_code=200;

let path="css/contact-us.css";

route(path,response,status_code,type);

}

else if(request.url == "/css/about-us.css")

{

let type="text/css";

let status_code=200;

let path="css/about-us.css";

route(path,response,status_code,type);

}

else if(request.url == "/css/not-found.css")

{

let type="text/css";

let status_code=200;

let path="css/not-found.css";

route(path,response,status_code,type);

}

//javascript page routing

else if(request.url == "/js/homepage.js")

{

let type="text/javascript";

let status_code=200;

let path="js/homepage.js";

route(path,response,status_code,type);

}

else if(request.url == "/js/about-us.js")

{

let type="text/javascript";

let status_code=200;

let path="js/about-us.js";

route(path,response,status_code,type);

}

else if(request.url == "/js/contact-us.js")

{

let type="text/javascript";

let status_code=200;

let path="js/contact-us.js";

route(path,response,status_code,type);

}

else if(request.url == "/js/not-found.js")

{

let type="text/javascript";

let status_code=200;

let path="js/not-found.js";

route(path,response,status_code,type);

}

else{

let type="text/html";

let status_code=404;

let path="html/not-found.html";

route(path,response,status_code,type);

}

});

server.listen(8080);

=>homepage.js

alert("welcome to homepage");

=>homepage.css

body{

background-color:blue;

}

=>homepage.html

<!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="../css/homepage.css">

<script src="../js/homepage.js"></script>

</head>

<body>

<h1>welcome to homepage</h1>

</body>

</html>

ch-12 nodejs core creating module api

1.cd desktop

Desktop>cd routing

Desktop\routing>nodemon

Desktop\routing>cd node-api

Desktop\routing\node-api>nodemon signup

2.Desktop\routing\node-api>cd..

3.index.js

const http=require("http");

const fs=require("fs");

const signup=require("./node-api/signup");

const route=(path,response,status_code,type)=>{

fs.readFile(path,(error,data)=>{

response.writeHead(status_code,{

'Content-Type':type

});

response.write(data);

return response.end();

});

}

const server=http.createServer((request,response)=>{

//html page routing

if(request.url == "/" || request.url == "/home" || request.url == "/homepage")

{

let type="text/html";

let status_code=200;

let path="html/homepage.html";

route(path,response,status_code,type);

}

else if(request.url == "/about" || request.url == "/about-us")

{

let type="text/html";

let status_code=200;

let path="html/about-us.html";

route(path,response,status_code,type);

}

else if(request.url == "/contact" || request.url == "/contact-us")

{

let type="text/html";

let status_code=200;

let path="html/contact-us.html";

route(path,response,status_code,type);

}

//css page routing

else if(request.url == "/css/homepage.css")

{

let type="text/css";

let status_code=200;

let path="css/homepage.css";

route(path,response,status_code,type);

}

else if(request.url == "/css/contact-us.css")

{

let type="text/css";

let status_code=200;

let path="css/contact-us.css";

route(path,response,status_code,type);

}

else if(request.url == "/css/about-us.css")

{

let type="text/css";

let status_code=200;

let path="css/about-us.css";

route(path,response,status_code,type);

}

else if(request.url == "/css/not-found.css")

{

let type="text/css";

let status_code=200;

let path="css/not-found.css";

route(path,response,status_code,type);

}

//javascript page routing

else if(request.url == "/js/homepage.js")

{

let type="text/javascript";

let status_code=200;

let path="js/homepage.js";

route(path,response,status_code,type);

}

else if(request.url == "/js/about-us.js")

{

let type="text/javascript";

let status_code=200;

let path="js/about-us.js";

route(path,response,status_code,type);

}

else if(request.url == "/js/contact-us.js")

{

let type="text/javascript";

let status_code=200;

let path="js/contact-us.js";

route(path,response,status_code,type);

}

else if(request.url == "/js/not-found.js")

{

let type="text/javascript";

let status_code=200;

let path="js/not-found.js";

route(path,response,status_code,type);

}

//nodeapis routing

else if(request.url == "/api/signup")

{

signup.result(request,response);

}

else{

let type="text/html";

let status_code=404;

let path="html/not-found.html";

route(path,response,status_code,type);

}

});

server.listen(8080);

=>signup.js

exports.result=(request,response)=>{

let formdata="";

request.on("data",(chunks)=>{

formdata+=chunks.toString();

});

//get data when chunks is completed

request.on("end",()=>{

console.log(formdata);

return response.end();

});

}

=>homepage.html

<!DOCTYPE html>

<head>

<title>Bootstrap Example</title>

</head>

<body>

</div>

<button type="submit" class="btn py-2" style="background-color:#24A7DF;color:white">SUBMIT</button>

</div>

</body>

</html>

=>homepage.js

window.onload=()=>{

signupRequest();

}

const signupRequest=()=>{

const form=document.querySelector("#signup-form");

form.onsubmit=(e)=>{

e.preventDefault();

//get form data

const formdata=JSON.stringify({

name:document.querySelector("#name").value,

email:document.querySelector("#email").value,

mobile:document.querySelector("#mobile").value,

password:document.querySelector("#password").value,

});

//ajax request

const ajax=new XMLHttpRequest();

ajax.open("POST","http://localhost:8080/api/signup",true);

ajax.send(formdata);

//get response

ajax.onload=()=>{

const data =JSON.parse(ajax.response);

alert(data.message)

}

ch-13 nodejs core handling mongo from ui

1.cd desktop

Desktop>cd routing

Desktop\routing>npm init

Desktop\routing>npm install mongodb

=>db.js

const mongo=require("mongodb").MongoClient;

const url="mongodb://localhost:27017";

exports.insertOne=(formdata,request,response)=>{

const data=JSON.parse(formdata);

mongo.connect(url,(error,conn)=>{

const db=conn.db("nodewap");

db.collection("users").insertOne(data,(error,dataRes)=>{

if(error)

{

sendResponse(response,500,"internal server error");

}

else{

sendResponse(response,200,dataRes);

}

});

}

const sendResponse=(response,status_code,responseMessage)=>{

response.writeHead(status_code,{

'Content-Type':'application/json'

});

const message=JSON.stringify({

message:responseMessage

});

response.write(message);

return response.end();

}

=>homepage.js

window.onload=()=>{

signupRequest();

}

const signupRequest=()=>{

const form=document.querySelector("#signup-form");

form.onsubmit=(e)=>{

e.preventDefault();

//get form data

const formdata=JSON.stringify({

name:document.querySelector("#name").value,

email:document.querySelector("#email").value,

mobile:document.querySelector("#mobile").value,

password:document.querySelector("#password").value,

});

//ajax request

const ajax=new XMLHttpRequest();

ajax.open("POST","http://localhost:8080/api/signup",true);

ajax.send(formdata);

//get response

ajax.onload=()=>{

const data =JSON.parse(ajax.response);

if(data.message.insertedId)

{

$(".toast").toast('show');

$(".toast").addClass("animate__animated animate__slideInRight");

$(".toast-body").html("thank you signup success");

}

else{

$(".toast").toast('show');

$(".toast").addClass("animate__animated animate__slideInRight");

$(".toast-body").html("oops internal server error");

}

=>homepage.html

<!DOCTYPE html>

<head>

<title>Bootstrap Example</title>

</head>

<body>

</div>

<button type="submit" class="btn py-2" style="background-color:#24A7DF;color:white">SUBMIT</button>

</div>

<strong class="mr-auto">Message</strong>

</div>

</div>

</body>

</html>

=>homepage.css

body{

background-color: #F1F1F2

}

#upload-form input{

border-top: none !important;

border-left: none !important;

border-right: none !important;

border-radius: 0 !important;

padding-left: 0 !important;

}

#upload-form input:focus{

box-shadow: none !important;

}

.toast{

position:fixed;

top:24px;

right:32px;

z-index:10000;

width:320px;

}

=>signup.js

const database=require("./db");

exports.result=(request,response)=>{

let formdata="";

request.on("data",(chunks)=>{

formdata+=chunks.toString();

});

//get data when chunks is completed

request.on("end",()=>{

database.insertOne(formdata,request,response);

});

}

ch-14 nodejs core working with promise

1.<!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>

</head>

<body>

<script>

function demo(){

var x=10;

var y=12;

var z=x+y;

return z;

}

alert(demo());

</script>

</body>

</html>

<!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>

</head>

<body>

<script>

function demo(){

const ajax=new XMLHttpRequest();

ajax.open("GET","https://jsonplaceholder.typicode.com/comments",true);

ajax.send();

ajax.onload=()=>{

console.log(ajax.response);

}

demo();

</script>

</body>

</html>

<!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>

</head>

<body>

<script>

function demo(){

const ajax=new XMLHttpRequest();

ajax.open("GET","https://jsonplaceholder.typicode.com/comments",true);

ajax.send();

ajax.onload=()=>{

console.log(ajax.response);

}

console.log("testing");

}

demo();

</script>

</body>

</html>

<!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>

</head>

<body>

<script>

function demo(){

const ajax=new XMLHttpRequest();

ajax.open("GET","https://jsonplaceholder.typicode.com/comments",true);

ajax.send();

ajax.onload=()=>{

return ajax.response;

}

console.log(demo());

</script>

</body>

</html>

<!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>

</head>

<body>

<script>

function demo(){

const ajax=new XMLHttpRequest();

ajax.open("GET","https://jsonplaceholder.typicode.com/comments",true);

ajax.send();

return new Promise((success,error)=>{

ajax.onload=()=>{

error(ajax.response);

}

});

}

demo().catch((response)=>{

console.log(response);

});

</script>

</body>

</html>

2.db.js

const mongo=require("mongodb").MongoClient;

const url="mongodb://localhost:27017";

//establish connection

const config=()=>{

return new Promise((resolve,reject)=>{

mongo.connect(url,(error,conn)=>{

const db=conn.db("nodewap");

const collection=db.collection("users");

resolve(collection);

});

}

//fetch or find data

exports.find=(query)=>{

return new Promise((resolve,reject)=>{

config().then((collection)=>{

collection.find(query).toArray((error,dataRes)=>{

if(dataRes.length !=0)

{

resolve({

status_code:200,

message:dataRes

});

}

else{

reject({

status_code:404,

message:"data not found"

});

}

});

}

//insert data

exports.insertOne=(formdata)=>{

return new Promise((resolve,reject)=>{

config().then((collection)=>{

collection.insertOne(formdata,(error,dataRes)=>{

if(error)

{

reject({

status_code:500,

message:"internal server error"

});

}

else{

resolve({

status_code:200,

message:dataRes

});

}

});

}

=>homepage.js

window.onload=()=>{

signupRequest();

}

const signupRequest=()=>{

const form=document.querySelector("#signup-form");

form.onsubmit=(e)=>{

e.preventDefault();

//get form data

const formdata=JSON.stringify({

name:document.querySelector("#name").value,

email:document.querySelector("#email").value,

mobile:document.querySelector("#mobile").value,

password:document.querySelector("#password").value,

});

//ajax request

const ajax=new XMLHttpRequest();

ajax.open("POST","http://localhost:8080/api/signup",true);

ajax.send(formdata);

//get response

ajax.onload=()=>{

const data =JSON.parse(ajax.response);

console.log(data);

}

=>signup.js

const database=require("./db");

exports.result=(request,response)=>{

let formdata="";

request.on("data",(chunks)=>{

formdata+=chunks.toString();

});

//get data when chunks is completed

request.on("end",()=>{

const userInfo=JSON.parse(formdata);

const query={

email:userInfo.email

};

//check user exists or not

const findRes=database.find(query);

findRes

.then((successRes)=>{

sendResponse(

response,

successRes.status_code,

successRes.message

);

})

.catch((errorRes)=>{

//new user try to proceed the signup

createUser(userInfo);

});

const createUser=(userInfo)=>{

const insertRes=database.insertOne(userInfo);

insertRes

.then((successRes)=>{

console.log(successRes);

})

.catch((errorRes)=>{

console.log(errorRes);

});

}

//send response

const sendResponse=(response,status_code,responseMessage)=>{

response.writeHead(status_code,{

'Content-Type':'application/json'

});

response.write(JSON.stringify(responseMessage));

return response.end();

}

Monday, 17 May 2021

NODEJS

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