I'm new to Node js and i have a function that receives a json object with numeric values, that i try to add up and display the result on the browser using a "Sum" property. The problem occurs at the mathsServer.js (split() method in the addera()). I do not understand why i suddenly get this error especially when i modified my code according to a MVC. When i run it independently in one file it worked well at some point. Here is my code.
Im supposed to POST a json in postman:
{
"tal": "10,343,24,345,22,23,233, 45, 200,500"
}
router.js:
const express = require("express");
const router = express.Router();
const controller = require("./controllers/controller");
router.post("/add", controller.renderSum)
router.get("/add",controller.renderSum)
module.exports = router
controller.js:
const mathServerModel = require("../../../mathServer/model/mathModel");
exports.renderSum = (req, res) => {
mathServerModel.addera(req.body.tal)
.then(function (data) {
console.log(data);
//res.send({data});
res.render("post-tal", {
Sum: {data} // A property called Sum to be displayed on the browser
})
})
.catch(error => console.log(error))
}
mathModel.js
const express = require('express');
const bodyParser = require('body-parser');
const app = express();
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
const addera = async (tal) => {
let strNumbersArr = tal.split(","); // ["10", "343", "24", ..., "233"]
let sum = 0;
for(let i = 0; i < strNumbersArr.length; i++) {
let currentNumberStr = strNumbersArr[i];
sum += Number(currentNumberStr); // convert current number string into a number
}
return sum;
}
module.exports = {
addera
}
index.hbs
<!DOCTYPE html>
<html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>WebApp</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.6.2/css/bulma.min.css">
<link rel="stylesheet" type="text/css" href="../css/style.css">
<style>
.eNavAction {cursor:pointer}
.buttons {margin-top: 20px}
</style>
<script src="js/simple-helper.js"></script>
<script src="model/customer-model.js"></script>
<script src="view/customer-view.js"></script>
<script src="controller/main-controller.js"></script>
<script>
var Current = {};
const Model = new TeamsModel();
const View = new TeamView();
const ViewTal = new TalView();
const Controller = new MainController();
document.addEventListener('DOMContentLoaded', function() {
// Controller.init();
Helper.onClassClick('eNavAction',Controller.navAction);
});
</script>
</head>
<body>
<nav class="navbar is-link" role="navigation" aria-label="main navigation">
<div class="navbar-brand">
<a class="navbar-item" href="/">
<span style="font-weight:bold; font-size:20px" href="http://127.0.0.1:3000/">My Web App</span>
</a>
</div>
<div id="navbar" class="navbar-menu">
<div class="navbar-start">
<a class="eNavAction navbar-item" action ="teams" href="http://127.0.0.1:3000/">Teams</a>
<a class="navbar-item" action= "tal">Sum</a>
</div>
</div>
</nav>
<div class="section">
<div id="main-container">
<div class="enterTal">
<div class="displaySum">
<p>Sum is: {{Sum}}</p>
</div>
</div>
</div>
</div>
</body>
</html>
It appears in controller.js req.body doesn't have an object tal (req.body.tal). You must start your investigation there. mathServerModel.addera() call is passing Undefined object as parameter.
In mathsServer.js, make your code defensive, by first checking your parameters' validity. Check if they have the values and types you were expecting before going into your function's logic.
Related
I need to get value from Google spreadsheet iframe, only one cell (A2) that I display on website.
This value (10%) I want to transfer to progress bar (style="width: [value from google spreadsheet]").
Is it possible?
Thanks!
EDIT:
I've add API and it works very well, I can show values in CMD, so now I want to get this value and transfer to my website. Any suggestions?
const GoogleSpreadsheet = require('google-spreadsheet');
const { promisify } = require('util');
const creds = require('./client_secret.json');
function printInfo(my_sheet){
console.log(`Name: ${my_sheet.kontrahent}`);
}
async function accessSpreadsheet() {
const doc = new GoogleSpreadsheet('ID');
await promisify(doc.useServiceAccountAuth)(creds);
const info = await promisify(doc.getInfo)();
const sheet = info.worksheets[4];
console.log(`Title: ${sheet.title}, Rows: ${sheet.rowCount}`);
const rows = await promisify(sheet.getRows)({
offset: 1
});
console.log(rows[0].kontrahent); <!--I want get this value and transfer it to my div progress bar on HTML -->
rows.forEach(row => {
printInfo(row)
});
}
accessSpreadsheet();
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
<title>My test page</title>
</head>
<body>
<iframe src="https://docs.google.com/spreadsheets/d/e/2PACX-1vST98KwaC1TPrCA-I-t7DrtL6dcjiFt1K1300c2j57N-SbcYRA2r4akTE_QxuStIvky39bedioEx-Tr/pubhtml?gid=0&single=true&range=A2&widget=false&headers=false&chrome=false" height="40px" width="226px"></iframe>
<div class="progress">
<div class="progress-bar progress-bar-success" style="width: 80%"></div>
</div>
</body>
</html>
iFrame interaction is kinda complicated and unsafe. A better way to tackle this problem is using the Google Sheets API.
Here is the basic reading section: https://developers.google.com/sheets/api/samples/reading
You would need the following components:
Google API key
Something to do a basic REST request
I have my js code as
app.get("/", function(req, res) {
var sql="SELECT image FROM images WHERE img_id=2";
connection.query(sql, function(err, result){
if(result.length <= 0)
message = "Profile not found!";
console.log(result);
res.render('image.ejs',{data:result});
});
});
and the image.ejs code is:
<html>
<head>
<title>Images</title>
</head>
<body>
<%= data %>
</body>
</html>
When I have runned it I just got the response like
[object Object]
but I need to my image to get displayed.will you guys help me out?
An ArrayBuffer/Buffer can't be a value for an img tag, what you can do is base64 encode the image, and display it
res.render('image.ejs',{ data: result[0].image.toString('base64') });
Now on your HTML
<html>
<head>
<title>Images</title>
</head>
<body>
<img src='data:image/png;base64,<%= data %>' />
</body>
</html>
If your images have different extensions, you can use: file-type package on the buffer and add the image type to the data passed to res.render
const imageBuffer = result[0].image;
const { mime } = await FileType.fromBuffer(imageBuffer)
res.render('image.ejs', { data: imageBuffer.toString('base64'), mime });
<img src='data:<%= mime %>;base64,<%= data %>' >
$(function() {
$('button').on('click', function() {
new Darkroom('#edit', {
plugins: {
save: {
callback: function() {
console.log('saving');
var darkroom = this.darkroom;
darkroom.canvas.clear().renderAll();
darkroom.selfDestroy();
return true;
}
}
}
});
});
});
<html>
<head>
<link href="https://rawgithub.com/MattKetmo/darkroomjs/master/build/darkroom.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.6.2/fabric.min.js"></script>
<script src="https://rawgit.com/MattKetmo/darkroomjs/master/build/darkroom.js"></script>
</head>
<body>
<div style="margin-top:50px">
<img id="edit" class="data-uri-example" src="data:image/gif;base64,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">
</div>
<button type="button">Edit</button>
</body </html>
Using darkroom js and fabric js. After I save the canvas data I want to remove the img/canvas from the page. The original img tag used in initialization '#edit' is no longer an element on the page. Seems it's replaces by a new img.
I've tried the .clear() also .clear().renderAll(). I get no error but the image still shows on the page.
Remove div element for control Darkroom and in code create again
$(function () {
$('button').on('click', function () {
$('#main-el').html('');
$('#main-el').append('<img id="edit" class="data-uri-example" src="...">');
new Darkroom('#edit');
});
});
Can someone please point me in the right direction. I tried google and didn't find much regarding my issue. While the following code works perfectly fine when running the .html file directly, it doesn't while serving the file in a node express app. The problem is that with node I don't see any data. page loads fine but no data.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="jquery.js"></script>
<script src="handlebars.js"></script>
<script src="underscore.js"></script>
<script src="backbone.js"></script>
<script src="moment.js"></script>
<!-- Setup our templates -->
<script id="PersonTemplate" type="text/x-handlebars-template">
<div>
Person:<br>
{{name}}
{{age}}
</div>
</script>
<!--
Note the [] this is important
because handlebars and backbone collections
dont play well with each other in regards
to naming JSON groups
-->
<script id="PeopleTemplate" type="text/x-handlebars-template">
<div>
People:<br>
{{#each []}}
{{this.name}}
{{this.age}}
<br/>
{{/each}}
</div>
</script>
<!-- End templates setup -->
<script>
// Stub out the person model
var Person = Backbone.Model.extend({
});
// Create a collection of persons
var People = Backbone.Collection.extend({
model: Person
});
// Define the view for a single person
var PersonView = Backbone.View.extend({
render: function() {
// This is method that can be called
// once an object is init. You could
// also do this in the initialize event
var source = $('#PersonTemplate').html();
var template = Handlebars.compile(source);
var html = template(this.model.toJSON());
$(this.el).html(html);
}
});
// Define the view for People
var PeopleView = Backbone.View.extend({
render: function() {
// This is method that can be called
// once an object is init. You could
// also do this in the initialize event
var source = $('#PeopleTemplate').html();
var template = Handlebars.compile(source);
var html = template(this.collection.toJSON());
$(this.el).html(html);
},
initialize: function(){
this.collection.on('add', this.render, this)
}
});
// Create instance of People Collection
var people = new People();
// Create new instances of the person models
var person = new Person({name: "Tim", age: 5});
var person2 = new Person({name: "Jill", age: 15});
// Create instances of the views
var personView = new PersonView({
model: person
});
var peopleView = new PeopleView({
collection: people
});
$(document).ready(function(){
// We have to do this stuff in the dom ready
// so that the container objects get built out
// Set el of the views.
personView.el = $('#personContainer');
peopleView.el = $('#peopleContainer');
// Add them to a new instance of the people collection
people.add(person);
people.add(person2);
// Render the views. If you are using the initialize
// method then you do not have to do this step.
personView.render();
//peopleView.render();
// Try on console!
// people.add(new Person({name: 'Rames', age:'23'}));
});
</script>
</head>
<body>
<div id='personContainer' ></div>
<hr>
<div id='peopleContainer' ></div>
</body>
</html>
Thanks in advance for your help.
i'm using the EJS template engine with nodejs/express and i'm wondering if it's possible to add another css or js file in e.g the index.ejs (not the layout.ejs)
layout.ejs
<!DOCTYPE html>
<html>
<head>
<title><%= title %></title>
<link rel='stylesheet' href='/stylesheets/style.css' />
<link rel='stylesheet' href='/stylesheets/smoothness/jquery-ui-1.8.14.custom.css' />
</head>
<body>
<%- body %>
</body>
</html>
index.ejs
<h1><%= title %></h1>
<p>Welcome to <%= title %></p>
i don't want to add the second css file in every template but only the index.ejs - is there any way i can do that?
found a solution here: Node.js with Express: Importing client-side javascript using script tags in Jade views?
it's using jade instead of EJS but works all the same.
here are some code-snippets for express 2.4.0.
you have to add the following "helpers" to your app.js
app.helpers({
renderScriptsTags: function (all) {
if (all != undefined) {
return all.map(function(script) {
return '<script src="/javascripts/' + script + '"></script>';
}).join('\n ');
}
else {
return '';
}
}
});
app.dynamicHelpers({
scripts: function(req, res) {
return ['jquery-1.5.1.min.js'];
}
});
the layout.ejs looks sth like this:
<!DOCTYPE html>
<html>
<head>
<title><%= title %></title>
<link rel='stylesheet' href='/stylesheets/style.css' />
<%- renderScriptsTags(scripts) %>
</head>
<body>
<%- body %>
</body>
</html>
if you don't add any scripts to the scripts-array, only 'jquery-1.5.1.min.js' will be included - if you want to add files to a subpage you can do this like so:
test.ejs
<% scripts.push('jquery-ui-1.8.14.custom.min.js', 'jquery.validate.min.js') %>
<h1><%= title %></h1>
<p>I'm a template with 3 js files in the header</p>
that's it.
As helpers and dynamicHelpers are gone in Express > 3, I rewrote pkyeck code so it works in Express 3.
So in app.js have this instead of the helpers / dynamicHelpers. Leave everything else as is.
app.locals({
scripts: [],
renderScriptsTags: function (all) {
app.locals.scripts = [];
if (all != undefined) {
return all.map(function(script) {
return '<script src="/javascripts/' + script + '"></script>';
}).join('\n ');
}
else {
return '';
}
},
getScripts: function(req, res) {
return scripts;
}
});
In app.js add line:
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');
app.use(express.static(__dirname + '/public')); // This line.
In layout.ejs:
<!DOCTYPE html>
<html>
<head>
<title>Authentication Example</title>
<link rel="stylesheet" href="/stylesheets/style.css"/>
<script src="/javascripts/jquery.js"></script>
</head>
<body>
<%- body %>
</body>
</html>
In index.ejs or login.ejs:
<h1>Login</h1>
<form method="post" action="/login">
<p>
<label>Username:</label>
<input type="text" name="username">
</p>
<p>
<label>Password:</label>
<input type="text" name="password">
</p>
<p>
<input type="submit" value="Login">
</p>
</form>
<script src="/javascripts/test.js"></script> <!-- Second Script -->
In test.js:
$(document).ready(function() {
try{
alert("Hi!!!");
}catch(e)
{
alert("Error");
}
});
Regards.
Thanks #asprotte for providing this for express 4.x. Did you tested this?
Because it does not appears to be working for me. So I have made some changes to your code here are they:
Put this in app.js file
app.locals.scripts = [];
app.locals.addScripts=function (all) {
app.locals.scripts = [];
if (all != undefined) {
app.locals.scripts = all.map(function(script) {
console.log(script);
return "<script src='/js/" + script + "'></script>";
}).join('\n ');
}
};
app.locals.getScripts = function(req, res) {
return app.locals.scripts;
};
then in template file put (I am using ejs template here) :
<% addScripts(['cart.js']) %>
Then in the layout file we need these to append at the bottom of the page get the scripts
<%- getScripts() %>
I have tested it and its working for me. Please correct me if I am wrong.
Thanks,
Thanks for illustrating this option pkyeck!
In express 4.x app.locals is an object. Here's pkyeck's answer rewritten to work in express 4.x:
app.locals.scripts = [];
app.locals.addScripts=function (all) {
app.locals.scripts = [];
if (all != undefined) {
return all.map(function(script) {
return "<script src='/javascripts/" + script + "'></script>";
}).join('\n ');
}
else {
return '';
}
};
app.locals.getScripts = function(req, res) {
return scripts;
};