I’m trying to get a specific document in mongodb and I’m using find(). the problem is that it doesn’t give me the result that I’m looking for in the html file (for example: i choose MALE and XL which I know I have in my database). what I get is:
x
Connected successfully to server { _id: 5df3c05bdfcdbd13d89d7c91, '•D_id': '', name: null, gender: null, breed: null, size: null, age: null, location: null } DONE*I have that kind of null document, but it’s not what I asked for.
The HTML file:
<html> <head> </script> </head> <body> <link rel ="stylesheet" type='text/css' href='form.css'> <div class="form"> <form method="POST" action="http://localhost:8080" style="text-align:center"> <label>Gender:</label><br> <select> <option name="g_gender" value="MALE">MALE</option> <option name="g_gender" value="FEMALE">FEMALE</option> </select> <br><br> <label>size:</label><br> <select> <option name="g_size" value="XS"> XS</option> <option name="g_size" value="S"> S</option> <option name="g_size" value="M"> M</option> <option name="g_size" value="L"> L</option> <option name="g_size" value="XL"> XL<br><br> </select> <br><br> <br><button type="submit" class="button" value="Reset">RESET</button> <button type="submit" class="button" value="Submit">SEARCH</button> </form> </div> </body> </html>The node.js file:
var express = require('express'); const bodyParser= require('body-parser'); const MongoClient = require('mongodb').MongoClient; const mongo_url = 'mongodb://localhost:27017'; const http = require('http'); const assert = require('assert'); const qstring=require('querystring'); var app = express(); app.use(bodyParser.urlencoded({extended: true})) app.get('/', (req, res) => { res.sendFile(__dirname + '/form.html'); }) http.createServer(function (req, res) { if (req.method == "POST"){ var reqData = ''; req.on('data', function (chunk) { reqData += chunk; }); req.on('end', function() { var postParams = qstring.parse(reqData); getDogsData(postParams.g_gender,postParams.g_size,res); }); function getDogsData(g_gender,g_size,res){ MongoClient.connect(mongo_url,{ useUnifiedTopology: true },function(err,client) { assert.equal(null, err); console.log("Connected successfully to server"); var database = client.db('Dogs'); const coll = database.collection('adptdog'); const cursor = coll.find({gender:g_gender,size:g_size}); cursor.forEach(function(doc) { res.write(JSON.stringify(doc)); console.log(doc); },function(err) { console.log("DONE"); client.close(); }); }); } }}).listen(8080);Advertisement
Answer
HTML code:we have to add id and name into select tag then you can fetch value into the server-side. <div class="form"> <form method="POST" action="http://localhost:8080" style="text-align:center"> <label>Gender:</label><br> <select name="g_gender" id="g_gender"> <option name="g_gender" value="MALE">MALE</option> <option name="g_gender" value="FEMALE">FEMALE</option> </select> <br><br> <label>size:</label><br> <select name="g_size" id="g_size"> <option name="g_size" value="XS"> XS</option> <option name="g_size" value="S"> S</option> <option name="g_size" value="M"> M</option> <option name="g_size" value="L"> L</option> <option name="g_size" value="XL"> XL<br><br> </select> <br><br> <br><button type="submit" class="button" value="Reset">RESET</button> <button type="submit" class="button" value="Submit">SEARCH</button> </form> </div> you will request data into req.body. node.js file: var express = require('express'); const bodyParser= require('body-parser'); const MongoClient = require('mongodb').MongoClient; const mongo_url = 'mongodb://localhost:27017'; const http = require('http'); const assert = require('assert'); const qstring=require('querystring'); var app = express(); app.use(bodyParser.urlencoded({extended: true})) app.get('/', (req, res) => { res.sendFile(__dirname + '/form.html'); }) http.createServer(function (req, res) {if (req.method == "POST"){ let body=req.body; getDogsData(body.g_gender,body.g_size,res); function getDogsData(g_gender,g_size,res){ MongoClient.connect(mongo_url,{ useUnifiedTopology: true },function(err,client) { assert.equal(null, err); console.log("Connected successfully to server"); var database = client.db('Dogs'); const coll = database.collection('adptdog'); const cursor = coll.find({gender:g_gender,size:g_size}); cursor.forEach(function(doc) { res.write(JSON.stringify(doc)); console.log(doc); },function(err) { console.log("DONE"); client.close(); }); }); } }}).listen(8080);