NodeJS - Add external module via code - javascript

Im having a nodeJS &express application which you can use like following:
var myNodeApp = require('myNodeApp');
my question is if there is a way to add to this application a new module/file by code
something like
var myNodeApp = require('myNodeApp');
myNodeApp.addModule("newModule")
or something like
myNodeApp.addFile("/path to the file")
That in run-time I will be able to read the content.
Im not talking about the typical import export(or npm install) module inside my node project(this is obvious) , I want that by code the developer(which use my node app) will be able to add file/module to my code which In RT I will be able to use.
Is it possible in node.js ?
I try to find referance about this topic without success...

Related

How to use nodejs file with html file?

I have a frontend in HTML and JAVASCRIPT. I need to get value from nodejs file and display it in HTML label. So I create new node js file node.js as:
const Web3 = require('web3');
const web3 = new Web3('https://kovan.infura.io');
web3.eth.getBalance('0x9E632F36D8193a23ee76e7C14698aCF4b92869A2').then(console.log);
I include this file in script tag as:
<script src="node.js"></script>
First I want to look output in the console but it is giving an error
Uncaught ReferenceError: require is not defined
So, I try this code directly in HTML file within the script tag without including node file but still gives the same error.
Can somebody help me with this? I am new to use all this together.
Somehow, I managed to find a solution. I used browserify, which makes easy for me to run the nodejs code from my web app.
Browsers don't have the require method defined, but Node.js does. With Browserify you can write code that uses require in the same way that you would use it in Node.
browserify will recursively analyze all the require() calls in your app in order to build a bundle you can serve up to the browser in a single tag.
I referred this link: http://browserify.org/

Load a JS dependency from browserify bundle

I have a single page app which comprises of a JS bundle based on Browserify and Coffeescript.
In a certain usecase, I need to create an adhoc page (Detached from the SPA) which needs to access a library (Kendo to be specific), which is part of the browserified bundle and the adhoc page would have some simple JS based on kendo.
The question is how do I load/access the library outside the Single Page Application (If I try loading it, the browser says that the library is not found)?
Using RequireJS could be an option as specified here. But, I dont want to use another library just for this purpose. I think there must be a way to "require" the library without requireJS because it is already working in the Single Page Application.
Please help.. Thanks!
Browserify rewrites your module paths like ../moduleA/file.js into an internal module id like 23 when packing.
Every require statement will also be rewritten, a statement like this:
var moduleA = require('../moduleA/file.js');
Becomes this:
var moduleA = require(23);
To get access to a particular library, you can do to things:
1) find the internal id via debugger and then require the module via it (this is quite fragile, because the internal id could change with every build)
2) package another file into your bundle with the following contents:
var kendo = require('kendo');
window.kendo = kendo;
Afterwards, you can simply access kendo as a page global.

I need a strongloop example wrote in javascript without angular

I want to have a strongloop example only using javascript without angular.
There's no complete working example without angular for now.
I want to simply include the browser.bundle.js in my index.html, then sync data from/to server side. In fact, I'm trying to replace pouchdb in my program since the couchdb seems not success in open source community.
I can't follow up this document correctly:
Running Loopback in the browser
create browser-app.js with the content from Running Loopback in the browser
copy past the content to browser-app.js
npm install loopback loopback-boot
browserify browser-app.js -o app.bundle.js Then I got error: Error: Cannot find module 'loopback-boot#instructions' from '/Users/simba/Projects/traveller-app/client/node_modules/loopback-boot'
There are few steps for this but its pretty simple.
Bootstrap your application via slc loopback.
Delete server/boot/root.js.
Uncomment two lines in server/server.js, it should look like:
...
// -- Mount static files here--
// All static middleware should be registered at the end, as all requests
// passing the static middleware are hitting the file system
// Example:
var path = require('path'); //this line is now uncommented
app.use(loopback.static(path.resolve(__dirname, '../client'))); //this line is now uncommented
...
Create index.html in the client dir (ie. client/index.html) with your contents.
That should get you a basic set up with just a basic front-end working. Let me know if you have any more issues.

Using browserify with typescript to include a node module

I'm attempting to use a node module in a typescript application and I've included it in my TypeScript code via require().
I build my typescript to JS and all works well if I run it through node which is great.
I'm looking for a way to use the same code and run it through the browser. Browserify seemed like a sensible solution.
I popped a post build action on my VS project and I'm building a 206KB file via browserify (so it's certainly doing something!). Unfortunately my tiny bit of Typescript doesn't seem to be accessible when it's been browserified.
I'm not that familiar with what browserify should be generating so not quite sure whether what it's wrapped my .js code in is correct (can post snippets if it helps).
So my question is twofold really, I'm looking for the answer to either:
Is there a recommended way to write TypeScript post 0.9 to allow it to be run after it's been browserified?
Is there a way to simple tell TypeScript to pull in the 'require' dependency on its own?
Any thoughts or info in this area would be greatly appreciated.
EDIT:
Just to clarify, I'm generating my .js from the .ts during save/build, and in a post build action, pointing browserify to the output. An abridged js output looks like this:
var TestModule;
(function (TestModule) {
function launchDrone() {
var exports = require('ar-drone');
var client = exports.createClient();
}
})(TestModule || (TestModule = {}));
When I generate the browserified file from that, I can't access TestModule or launchDrone in any context (or certainly not from window. ) is there some trick to accessing the browserified code?
It looks like you potentially are not exporting TestModule? Your TestModule file should look like this:
module TestModule {
export function launchDrone() {
var exports = require('ar-drone');
var client = exports.createClient();
}
}
export = TestModule;
This way you should be able to launch TestModule and TestModule.launchDrone from the window.

Javascript/Node/Twilio - ReferenceError: require is not defined

I have installed Node from:
Node
and run this in cmd:
npm install twilio
I then tried the example code provided by Twilio:
var accountSid = 'MyAccountSidHere';
var authToken = "MyAccountAuthTokenHere";
var client = require('twilio')(accountSid, authToken);
client.sms.messages.create({
body: "Jenny please?! I love you <3",
to: "SomeNumber",
from: "MyNumber"
}, function(err, message) {
process.stdout.write(message.sid);
});
Saved this to MyFile.js file and double clicked it.
I get the error message:
ReferenceError: require is not defined
This is my first encounter with JavaScript and I found a lot of similar questions, but have not been able to solve this.
I am to use this with QML, so I want to load it using:
import "MyFile.js" as MyFile
then call the javascript code as a function.
I've read a little into QML and I don't see how you could use a node.js module in QML. QML is used as a language where QT is the JavaScript engine and node.js is a server-side Javascript engine.
The require() function is a core function of node.js which is part of the engine. It's not something language-specific just like the window object in browser-based Javascript is not something in the Javascript language.
As I said in my comment, you should check out what node.js actually is: a server-side JavaScript engine, which executes JavaScript files. It is not a framework which you could load into another engine like QT.
Your code will run if you use it like this from the command-line:
node MyFile.js
I doubt this is helpful for your use-case as a QML import though.

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