I am trying to get back a record out of my MongoDB database using user input on an Angular template. Here's what's in my api.js file:
// Response handling
let response = {
status: 200,
key: [],
message: null
};
router.get('/keys/:key', (req, res, next) => {
connection((db) => {
db.collection('keys')
.findOne({key: req.params.key})
.then((keys) => {
response.key = keys;
res.json(keys);
})
.catch(err => {
return next({ status: 500, message: 'messed up'})
});
});
});
Here's my keys.service.ts file:
#Injectable()
export class KeysService {
result: any
constructor(private _http: Http) {}
getKeys(typeKey) {
return this._http.get(`/api/keys/:key${typeKey}`)
.map(result => this.result = result.json().key);
}
}
Here's the template (I apologize about the formatting):
<div class="container">
<div style="text-align:center">
<h1>
Welcome to {{ title }}!
</h1>
</div>
<div class="row">
<div class="col-xs-12 col-sm-10 col-md-8 col-sm-offset-1 col-md-offset-2">
<input type="text" [(ngModel)]="typeKey">
<button class="btn btn-primary" (click)="getKeyClass(typeKey)">Check Your
Key Spelling</button>
<br><br>
<h2>The Correct Key Spelling is: {{ keySpelling }}</h2>
</div>
</div>
</div>
What I am receiving as an error right now is "type error, can not read property key of null". It is referring to "key" in the keys.service.ts file on the last line.
I am not using mongoose or monk here. I had this working with a general query of my db that gave me the entire contents of the collection "keys" but when I try and make an individual query, no dice. Anyone have any ideas what I am doing wrong?
Related
this is my app.js file for showing and updating info for my posts in one single Ejs template called compose: when I run my code I get this error
**
SyntaxError: missing ) after argument list in C:\Users\john\Desktop\blog\views\compose.ejs while compiling ejs**
app.post("/compose", function (req, res) {
var title= req.body.postTitle
var content= req.body.postText
const post = new Post({
title: title,
content: content
});
post.save(function(err){
if (!err){
res.redirect("/");
}
});
// res.redirect("/");
});
// update posts
app.get('/update/:postid', function (req, res) {
const updateId = req.params.postid;
Post.findById({_id: updateId}, function (err, record) {
if(!err) {
if(window.location.href.indexOf(''))
res.render('compose', {post:record});
}
});
});
and this is my compose Ejs file that I wanna do both showing and updating info with Mongodb in Ejs template:
<h1>Compose</h1>
<form action="/compose" method="post">
<div class="form-group">
<label for="posttitle"> Title</label>
<input type="text" id="" class="form-control" name="postTitle" placeholder="Title" value="<% if(window.location.href.contains("update/") > -1) { %> <%= post.title } %>" >
</div>
<div class="form-group">
<label for="desc">Description</label>
<textarea class="form-control" name="postText" id="desc" cols="30" rows="10" placeholder="Description">
<% if(window.location.href.contains("update/") > -1) { %>
<%= post.content } %>
</textarea>
</div>
<button class="btn btn-myPrimary" type="submit" value="" name="button">Publish</button>
</form>
I tried to show info from mongodb it was okay so then i made a route for updating the info using same template it gives me error
I am fairly new to nodejs and express. I am using nodejs and handlebars to create a simple back end CRUD App. Right now I am stuck on how to pass the value from a form I created in handlebars to an app.get function in my index.js file so inside my app.get function I can use the value to do a database query. After I do the query I want to display the results using app.get and render it to web page.
This is my Handlebars code:
<section id="main" class="wrapper">
<div id="view" class="container">
<section id="main" class="wrapper">
<div id="class" class="container">
<div class="card-body">
<form action="/getid/submit" method="POST">
<div class="form-group">
<label for="id"></label>
<input type="text" class="form-control" id="id" name="id"
placeholder="Enter ID">
</div>
<button type="submit" class="btn btn-primary">Enter ID</button>
</form>
</div>
</div>
</section>
This is the post function in index.js
app.post('/getid/submit',(req,res)=>{
const id = req.body.id;
console.log(id);
res.redirect('page1');
});
This is the app.get function:
app.get('/view/id',(req,res)=>{
//id = ?
var sql = `SELECT * FROM class WHERE Id =${id}`;
db.query(sql,function (err,result){
if(err) throw error;
res.render('page2',{title: 'test', items: rows})
});
});
My main question would be How do I pass the value that I am getting from the app.post form to my app.get function so I can run the query with that ID and render the values to the webpage. THank you in advance.
The id you need to achieve is in request parameters. So you should try:
app.get('/view/:id', (req, res) => {
//id = ?
const id = req.params.id
var sql = `SELECT * FROM class WHERE Id =${id}`;
db.query(sql, function (err, result) {
if (err) throw error;
res.render('page2', { title: 'test', items: rows })
});
});
I was building a weather app using OpenWeather API. The API was fetched in Node, then data was passed to React front end, code as follows:
Node index.js
const express = require('express');
const cors = require('cors');
const app = express();
const axios = require('axios');
const dotenv = require('dotenv');
dotenv.config();
const url = `http://api.openweathermap.org/data/2.5/weather?q=london,uk&APPID=${process.env.REACT_APP_WEATHER_API_KEY}`;
app.use(cors());
app.get('/', (req, res) => {
res.send('go to /weather to see weather')
});
app.get('/weather', (req, res) => {
axios.get(url)
.then(response => {res.json(response.data)})
.catch(error => {
console.log(error);
});
})
let port = process.env.PORT || 4000;
app.listen(port, () => {
console.log(`App running on port ${port} `);
});
The weather data can then be viewed in http://localhost:4000/weather. Then React is used to display the data. Assume there is a simple React component to accept weather input and update state:
React WeatherForm.js
import React from 'react';
class WeatherForm extends React.Component {
constructor(props) {
super(props);
this.state = {
country: '',
city: ''
}
}
updateLocation(e) {
this.setState({
country: e.target.value,
city: e.target.value
});
}
render() {
return (
<form>
<div className="field">
<label className="label">Country</label>
<div className="control">
<input
className="input"
type="text"
placeholder="Type country name here"
onChange={e => this.updateLocation(e)} />
</div>
</div>
<div className="field">
<label className="label">City</label>
<div className="control">
<input
className="input"
type="text"
placeholder="Type city name here"
onChange={e => this.updateLocation(e)} />
</div>
</div>
<div className="field">
<div className="control">
<input
type='submit'
value='Search' />
</div>
</div>
</form>
)
}
}
export default WeatherForm
Question: How can I pass the country and city user input from the React app form to the country and city in the url variable in this line in the Node code?
const url = `http://api.openweathermap.org/data/2.5/weather?q=city,country&APPID=${process.env.REACT_APP_WEATHER_API_KEY}`
UPDATE I have updated the WeatherForm component as follows:
import React from 'react';
import Axios from 'axios';
class WeatherForm extends React.Component {
constructor(props) {
super(props);
this.state = {
country: '',
city: ''
}
this.handleSubmit = this.handleSubmit.bind(this);
}
handleSubmit(e) {
e.preventDefault();
const url = 'http://localhost:4000/weather';
const location = {
country: this.state.country,
city: this.state.city
}
Axios.post(url, location).then((res) => {
// what should I do here?
}).catch((e) => {
console.log(e);
})
}
updateLocation(e) {
this.setState({
country: e.target.value,
city: e.target.value
});
}
render() {
return (
<form onSubmit={this.handleSubmit}>
<p className="title">Weather</p>
<p className="subtitle">Check weather by city and country</p>
<div className="field">
<label className="label">Country</label>
<div className="control">
<input
className="input"
type="text"
placeholder="Type country name here"
onChange={e => this.updateLocation(e)} />
</div>
</div>
<div className="field">
<label className="label">City</label>
<div className="control">
<input
className="input"
type="text"
placeholder="Type city name here"
onChange={e => this.updateLocation(e)} />
</div>
</div>
<div className="field">
<div className="control">
<input
type='submit'
value='Search' />
</div>
</div>
</form>
)
}
}
export default WeatherForm
and I got error: POST http://localhost:4000/weather 404 (Not Found)
You want to use http requests to send the data to your backend. You can either use the native window.fetch API to send the data via a post request, or you can use a third-party library (I recommend axios).
The recommended way to send a post request on form submit in react is to store the field data in state (use the onChange prop on the input fields to update the state whenever the input value changes), and then use a handler function that gets fired when the submit button is clicked (use the onClick prop for your button element).
The handler function should get the current state (the form input field data) and pass it into the post request as the body.
When your express API receives the request, it can parse the data, and then fire off it's own API request to the openWeather API with that data as the url parameters.
UPDATE:
Updating due to updated question.
You don't have a post route defined in your express API. Therefore it won't accept post requests at the /weather route. What you need to do is write a handler that accepts post requests:
app.post('/weather', (req, res, next) => {
let { country, city } = req.body.data;
// here you send a post request to the weather API url
// to retrieve the results, then send them back
// to your react app to display them
}
I'm new using parse and I'm trying to get the objects from my database and displaying them with ejs using a for loop in my webpage. I'm using back4app as my database.
Here's what I'm doing:
const Car = Parse.Object.extend('Vehicle');
const query = new Parse.Query(Car);
app.get('/', function(req, res){
const VehicleInfo = [
{
VehicleName: query.get('Name'),
Description: query.get('Description'),
Price: query.get('Price'),
Rating: query.get('Rating'),
Route: query.get('Route'),
PassengerAmount: query.get('PassengerAmount')
}
]
try{
res.render('index', {
title: 'mainPage',
VehicleData: VehicleInfo
});
}catch(error){
throw error.message;
}
});
I query this and all 5 of my vehicles are displayed in the console.log but when trying to do the same in my .ejs file this shows up and only one div displays
enter image description here
Here's how I'm using the for loop
<% for (var CarInfo of VehicleData) { %>
<div class="row">
<div class="col-lg-4 col-md-6">
<!-- Car Item-->
<div class="rn-car-item">
<div class="rn-car-item-review">
<div class="fas fa-star"></div> <%= CarInfo.Rating %>
</div>
<div class="rn-car-item-thumb">
<a href="/car-single">
<img class="img-fluid" src="/images/car-1.jpg" alt="Black Sedan" srcset="/images/car-1.jpg 1x, /images/car-1#2x.jpg 2x"/>
</a>
</div>
<div class="rn-car-item-info">
<h3>
<%= CarInfo.VehicleName %>
</h3>
<p>Descripcion: <%= CarInfo.Description %></p>
<div class="rn-car-list-n-price">
<ul>
<li>Ruta: <%= CarInfo.Route %></li>
<li>Cantidad de Pasajeros: <%= CarInfo.PassengerAmount %></li>
</ul>
<div class="rn-car-price-wrap">
<a class="rn-car-price" href="/car-single">
<span class="rn-car-price-from">Desde</span>
<span class="rn-car-price-format">
<span class="rn-car-price-amount">$<%= CarInfo.Price %></span>
<span class="rn-car-price-per">/day</span>
</span>
</a>
</div>
</div>
</div>
</div>
<!-- End Car Item-->
</div>
</div>
<% } %>
I'm sure your code doesn't work like this, also not in the console. You need to run find or first in order to fetch objects.
The other problem is that your Promise hasn't been resolved and doesn't contain the result when you pass it on to the .ejs file. It works in the console because the result in the console will be updated once the Promise is resolved.
You need to do
const VehicleInfo = [];
const query = new Parse.Query(Car);
query.find().then(result => {
result.forEach(vehicle => {
VehicleInfo.push({
VehicleName: result.get('Name'),
Description: result.get('Description'),
Price: result.get('Price'),
Rating: result.get('Rating'),
Route: result.get('Route'),
PassengerAmount: query.get('PassengerAmount')
});
});
}).catch(error => {
console.error('error fetching objects', error);
});
Alternatively you can await the result for cleaner code:
app.get('/', async function(req, res) {
const VehicleInfo = [];
const query = new Parse.Query(Car);
try {
const result = await query.find();
result.forEach(vehicle => {
VehicleInfo.push({
VehicleName: result.get('Name'),
Description: result.get('Description'),
Price: result.get('Price'),
Rating: result.get('Rating'),
Route: result.get('Route'),
PassengerAmount: query.get('PassengerAmount')
});
});
} catch (error) {
console.error('error fetching objects', error);
}
});
Here's more about Promises in JavaScript
i am setting a form with Mean Stack,
in form.html i have
<div ng-controller="InfoCtrl">
<form method="post" ng-submit="info()" name="infoForm">
<div class="radio">
<label>
<input type="radio" name="optionsRadios" id="Homme" value="Homme" checked>
Homme
</label>
</div>
<div class="radio">
<label>
<input type="radio" name="optionsRadios" id="Femme" value="Femme">
Femme
and in the controller info.js i have :
angular.module('MyApp')
.controller('InfoCtrl',[ '$scope', 'infor', function($scope, infor) {
$scope.info = function() {
infor.info({
age: $scope.age,
sexe: $scope.optionsRadios
});
};
}]);
another file infor.js, it only contains the error message after the set of the form, in the class server.js i have this function:
app.post('/infor/info', function(req, res, next) {
console.log('ok');
var query = {'email' : 'mail#mail.fr' };
var age1 = req.body.age;
console.log(req.body.optionsRadios);
User.findOneAndUpdate(query,{ age: age1 } , {upsert:true},function(err, doc){
if (err) return res.send(500, { error: err });
return res.send("succesfully saved");
});
});
but i didn't knew how to save the answer of the button radio in the query like i did in the set of new text. I have searched in many forms but it i didn't found an answer!