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Questions tagged [javascript]

JavaScript (not to be confused with Java) is a high-level, dynamic, multi-paradigm, weakly-typed language used for both client-side and server-side scripting. Use this tag for questions regarding common implementations of ECMAScript, JavaScript, JScript, etc. JS does not typically refer to its ECMA-cousin, ActionScript.

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Reasoning behind indexedDB versioning

So, the last 2 weeks I have been fighting with indexedDB and one of two recurring questions that keep popping up is why indexedDB has to use/present it's entire versioning system? I do understand that ...
David Mulder's user avatar
3 votes
0 answers
2k views

Digital Signature for PDF files through Web Application

We are developing a Web Application for manage dental clinics. The app can generate PDF files through the PHP backend (for example invoices, quotes etc.). Each of those PDF file needs to be digitally ...
Nite's user avatar
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3 votes
0 answers
195 views

data transfer objects between abstraction layers

I want to create an Express REST API and want to try following the clean architecture ideas. I was reading about it but didn't get the idea of the communication between the abstraction layers. Let's ...
Question3r's user avatar
3 votes
0 answers
419 views

Dynamic API Data Validation

I am in the process of building an heavily data-driven web application written in Node.js / Typescript with Mariadb for the database engine. I am trying to put an emphasis on extensibility and DRY ...
Antonyjim's user avatar
3 votes
0 answers
316 views

Redux Saga pattern for large, non-specific server responses

Our current Redux state tree is this: { "dog": { "name": "Barkley", "age": 6, "hungry": false, "location": "Living Room", "height": "36 in." }, "...
Matt's user avatar
  • 293
3 votes
0 answers
263 views

Does using returnTrue() or returnFalse() functions a code-smell?

I was trying to understand how jQuery's cross-browser events work, when I noticed these two functions in the source code: function returnTrue() { return true; } function returnFalse() { ...
53777A's user avatar
  • 1,718
3 votes
0 answers
125 views

In browser form validation in laravel

In laravel 5 I describe models without specifying fields in model class. Some magic identifies which fields exist in database for this model. use Illuminate\Database\Eloquent\Model; class MyModel ...
changer's user avatar
  • 31
3 votes
0 answers
95 views

How to architect rule matching with multiple conditionals and outcomes

I'm working on allowing my users to create their own ruleset for data that's coming in. All of the data below is sample mock data and not in relation to our product. Example of a rule (there can be ...
Jason K's user avatar
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3 votes
0 answers
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Suggestions for Storing large collection of related words

I am trying to create a simple sentence generator that uses templates and a database of words. It will be a website where essentially a user could click a button to generate a sentence. For example: ...
Bhough's user avatar
  • 41
3 votes
0 answers
382 views

Hot swapping files and metaprogramming with front-end JavaScript

I was inspired by a video on hotswapping JS files with React + Webpack for the web. I started trying it out with React + Backbone + RequireJS. Seems to work, as long as I stick to the stateless parts ...
Alexander Mills's user avatar
3 votes
0 answers
2k views

Managing Login Authentication/Webpage session: Can client side javascript/JQuery access either a session variable or json variable in html?

Short version: A variable is stored in a session variable req.session.userName and also in the json sent with res.render('/', {username: value}). How can I access either of those variables from inside ...
Tom's user avatar
  • 31
3 votes
0 answers
135 views

Can/should objects share methods in certain circumstances?

I am currently working on a web application that is supposed to resemble an operating system with GUI (it manages processes and windows). I have several constructors which deal with different aspects ...
rhino's user avatar
  • 357
3 votes
0 answers
559 views

How can I put multiple hierarchical forms in a single web page and avoid making it a mess?

We are a group of developers working on a web application that accepts forms filled and sent by our users and present it in an overall view. Our main form view looks like this: There are multiple ...
hamid's user avatar
  • 131
3 votes
0 answers
385 views

JS closures - Passing a function to a child, how should the shared object be accessed

I have a design and am wondering what the appropriate way to access variables is. I'll demonstrate with this example since I can't seem to describe it better than the title. Term is an object ...
DanielST's user avatar
  • 347
3 votes
0 answers
502 views

Reducing code complexity for an interface between angular and d3

I'm playing around with different ways of integrating d3 and angular, in the context of learning both of these frameworks, and am hoping for some input: My client application receives a JSON array ...
drew moore's user avatar
2 votes
0 answers
50 views

Software design for an Angular highlight&comment tool

We're building a new feature for an online editor that the user will not edit the document, but will be able to highlight & propose edits on the document. Very similar to google documents' ...
Bora's user avatar
  • 153
2 votes
0 answers
1k views

Setting width/height of unknown images for lazy loading

I have a site where users upload images & can all be viewed on a single page by other users. I want to lazy load images as the user scrolls instead of loading all initially. This is easy enough, ...
Avery Ferrante's user avatar
2 votes
0 answers
56 views

Javascript module design patterns

Partly for use in my own projects, and partly for fun while being stuck at home I'm attempt to build yet another "block" based editor. So far I've been using simple objects, starting with a global ...
USD Matt's user avatar
  • 227
2 votes
0 answers
234 views

React Hooks: using state in useEffect without depending on it

I have run into a situation in React where I want to run a function F in a useEffect hook whenever a value V1 from the store changes. F uses another value from the store V2. I only want to run F when ...
Ace's user avatar
  • 607
2 votes
0 answers
333 views

Send push notifications from ActiveMQ

I am trying to figure out how to send push notifications back to the client in the following ActiveMQ scenario: I have a spring boot web application #1 deployed on tomcat on RHEL server. From the ...
Tan's user avatar
  • 151
2 votes
0 answers
151 views

Is there an accepted Coding Style for multiple ES6 Arrow Functions?

I'm starting to use ES6 arrow functions more, but haven't found a coding style that I like, especially when chaining them together. e.g., Eric Elliott gives this code: mix = (...fns) => x => ...
user949300's user avatar
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2 votes
0 answers
1k views

Should I use a closure instead of a class when I only have one method?

Lets say I have a JavaScript class that takes a whole lot of settings in the constructor, and then only have one method that the user of the class might want to call multiple times. Here's an example: ...
Anders's user avatar
  • 1,351
2 votes
0 answers
1k views

Drag and Drop with animations

This is more of a theoretical question which I hope is okay!? I want to code my own drag and drop jQuery plugin, but i'm wondering the best way to go about structuring my code and actually doing it. ...
Martyn Ball's user avatar
2 votes
2 answers
568 views

How to get an object that another object is prototype of?

Javascript in the DOM has a peculiar characteristic. There's a different Object object that an object (by default) inherits per window. In order to find what kind of object is being sent to a function ...
brunoais's user avatar
  • 185
2 votes
0 answers
607 views

JavaScript program design: to what degree should I separate logic and display?

Consider you wanting to implement a simple game of checkers. There would be a rectangular game board and the player would able to move the pieces around according to a particular set of rules. ...
Aviv Cohn's user avatar
  • 21.4k
2 votes
0 answers
644 views

Binding in web frameworks - to frontend data or backend data?

AngularJS and other web frameworks provide data binding abilities (as in WPF). Is the UI bound to JavaScript variables on the frontend (web browser) or is it bound to the data in the server (via AJAX ...
Eugene's user avatar
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2 votes
0 answers
499 views

Should we still care about _escaped_fragment_ and alternate HTML generation for Single Page Applications?

A few months ago I started a project, which will have two parts – business client overview panel (AngularJS SPA) and public front-end (dynamic HTML with progressive enchancements via XHR). I'd really ...
Kristaps Karlsons's user avatar
2 votes
0 answers
514 views

Should I use SignalR to synchronize & cache CRUD data to a mobile app?

I'm considering using SignalR to send data to a mobile app, but need to have a way to synchronize data while it's closed or pending updates. Is it a good idea to use Backbone.js <--> SignalR to ...
makerofthings7's user avatar
1 vote
0 answers
138 views

Managing user session state with Google Sign In

I need some help with my authentication design. Happy to share any code as needed... Overview I have implemented the Google Sign-in (new web implementation here) button in my client web application. ...
Zack Shainsky's user avatar
1 vote
0 answers
61 views

Securing Arbitrary Code

I need to run arbitrary code snippets in Python and Javascript on a server. It cannot be run in the browser. I'm thinking of sandboxing the code in an AWS Lambda serveless function. However, I'm ...
user82395214's user avatar
1 vote
0 answers
56 views

advice for web communication protocol for "streaming" multiple JSON objects to multiple clients

As a hobby / to learn I am building an app in JavaScript using Node.js where a component of it will take input from a client, send it to a server, and then broadcast it to other clients. For ...
Leftover Salad's user avatar
1 vote
0 answers
89 views

Single page dashboard architecture

I am implementing a dashboard. I figured I'd make it work like a SPA for cleaner flow and better performance. When you click a sidebar link, the page/section gets loaded with AJAX. You can still ...
dabadaba's user avatar
  • 2,256
1 vote
0 answers
83 views

Should modules strive to export only one thing?

Ideally, functions should do one thing well, and only one thing. Does the same thing apply to what a module should export? Of course, modules aren't always the same thing as functions, but they often ...
Snow's user avatar
  • 119
1 vote
0 answers
355 views

Why does Babel convert async/await to generator functions rather than promises?

It's a bit of a moot point now that async/await is supported by all major, modern JavaScript engines, but I've always wondered why Babel converts async functions to generator functions rather than to ...
dx_over_dt's user avatar
1 vote
0 answers
309 views

Refactor MVC to more scalable architecture?

Months ago I began a new web project which, in the beggining, seemed like a small application with virtually few users. I began the project by using the awesome Hackathon Starter WebApp Boilerplate by ...
HumbertoWoody's user avatar
1 vote
1 answer
477 views

Organizing reducers in Redux

I will use the following popular todo list example for demonstration. Let's say I wanted to create a very basic todo list with this structure as the app state: { todos: { todoKey1: { ...
Derek 朕會功夫's user avatar
1 vote
0 answers
427 views

Should Flux mutation logic always be done in the store, or can it be delegated to a class?

(I am using Vuex but the question applies to any Flux architecture.) I don't have a great understanding of the reasoning behind Flux architecture. I understand that it is nice to have all of the ...
Adam Zerner's user avatar
1 vote
0 answers
65 views

Is this a good solution for Card holder applications?

Business case I am currently looking for a better architecture to replace the current implementation for my application. Currently, My application runs on a mainframe system with CICS used for ...
aka's user avatar
  • 11
1 vote
0 answers
107 views

If you name the functions on a "factory class" and then invoke them statically, is still a factory?

Let's take the following Javascript, but the language is not really relevant: module.exports = (user) => { return { createPrimaryConfig: () => { return new Config('a', 'b', ...
Vaughan Hilts's user avatar
1 vote
0 answers
534 views

Understanding transducers, why this is not a transducer

I'm currently learning functional programming and trying to learn a new concept : transducers. I'm actually getting the point of theory, like it's an advanced map/reduce that aims to provide better ...
mfrachet's user avatar
  • 1,531
1 vote
0 answers
133 views

Exporting functions usable by both client-side and server-side

So this isn't a question on how to do it, but more of a clarification on how it works. I'm using Vue and I'm creating a file that's usable by on both the client side and the server side (logic should ...
A. L's user avatar
  • 217
1 vote
0 answers
1k views

What are the best practices for picking selectors for web scrappers?

The following is an example using https://github.com/GoogleChrome/puppeteer 'use strict'; const puppeteer = require('puppeteer'); (async() => { // const browser = await puppeteer.launch(); // ...
alex's user avatar
  • 383
1 vote
1 answer
1k views

Angular2: Service architecture + error handling

I need support for Angular2 service architectures. I am quite familiar with Angular2 but I don't see the best way to implement services, error handling and their connection with the components. I'm ...
Gábor Imre's user avatar
1 vote
0 answers
56 views

How do I protect JS local scope but allow outside customization?

I am creating a javascript application that will live in a library and be used on multiple sites. I am looking for it to have the following features and need some guidance on accomplishing these goals:...
absentx's user avatar
  • 217
1 vote
0 answers
83 views

Capturing keyboard events for a limited time

I'm trying to code a kind of simple video game where there are two kind of players: Human Players: They enter an keyboard input CPU Players: A random input is calculated For Human Players there is a ...
charliebrownie's user avatar
1 vote
0 answers
213 views

Emberjs acceptance testing - should I mock services?

For ember acceptance tests is it best practice to mock services? This seems strange to me as I would expect an acceptance test not to have to mock anything as it's testing an entire system. Also, some ...
user1523236's user avatar
1 vote
0 answers
489 views

Versioning Practices for Javascript SPA Application

I've developed an SPA using AureliaJS. We use team Foundation server to service our source control, but that doesn't really help with good versioning practices. For instance, with our WPF applications,...
Brandon's user avatar
  • 213
1 vote
0 answers
74 views

designing better and crisp server.js (the file which is called to start node application 'e.g. node server.js')

While creating server.js file we need to provide routes information as var Login = require('./routes/login.js'); app.use('/login', Login); Now, suppose the node project is a REST services project. ...
Gaurav Shukla's user avatar
1 vote
0 answers
385 views

SystemJS Transpiler - where would it be used

I'm creating a project which uses SystemJS/JSPM. I'm also using TypeScript. Now TypeScript has the option of compiling JS using SystemJS Modules - which I'm doing and all is good. I've created TS ...
Chris Nevill's user avatar
1 vote
0 answers
640 views

How to design the state tree using redux?

In the last days I have searched for a documentation on how and when is it best to use redux and how to design the state tree. My research ended in the conclusion that there is no one correct answer. ...
Stav Alfi's user avatar
  • 297