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.
140
questions with no upvoted or accepted answers
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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 ...
- 139
3
votes
0
answers
198
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 ...
- 165
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424
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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 ...
- 31
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318
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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."
},
"...
- 293
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answers
264
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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() {
...
- 1,718
3
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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 ...
- 31
3
votes
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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 ...
- 31
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answers
94
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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: ...
- 41
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384
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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 ...
- 277
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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 ...
- 31
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136
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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 ...
- 357
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572
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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 ...
- 131
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answers
386
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 ...
- 347
3
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answers
502
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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 ...
- 173
2
votes
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answers
52
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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' ...
- 153
2
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0
answers
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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, ...
- 171
2
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56
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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 ...
- 227
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answers
236
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 ...
- 607
2
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answers
348
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 ...
- 151
2
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0
answers
152
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 => ...
- 8,919
2
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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:
...
- 1,361
2
votes
0
answers
1k
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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.
...
- 121
2
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2
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606
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 ...
- 185
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answers
611
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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.
...
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2
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answers
647
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 ...
- 1,933
2
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answers
500
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 ...
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 ...
- 6,060
1
vote
0
answers
147
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. ...
1
vote
0
answers
62
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 ...
- 119
1
vote
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answers
56
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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 ...
- 189
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90
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 ...
- 2,256
1
vote
0
answers
86
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 ...
- 119
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vote
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answers
365
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 ...
- 325
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314
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 ...
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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 ...
- 614
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vote
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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 ...
- 11
1
vote
0
answers
108
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', ...
- 360
1
vote
0
answers
541
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 ...
- 1,551
1
vote
0
answers
138
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 ...
- 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();
// ...
- 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 ...
- 185
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vote
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58
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:...
- 217
1
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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 ...
- 355
1
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0
answers
217
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 ...
- 111
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492
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,...
- 213
1
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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. ...
- 141
1
vote
0
answers
387
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 ...
- 320
1
vote
0
answers
642
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.
...
- 297
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vote
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answers
45
views
Best method to allow user to choose multiple things from my DB?
So I have a "Bars" table in my database and a "Add a Bar" form which allows a bar owner or manager to add his/her business listing to my website database. I also have a "Beers" table in my database ...
- 1,152
1
vote
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548
views
Conceptual similarity between Ruby's and JavaScript's inheritance models
To clear some potential confusion, let me start with the following statements
As far as I understand, inheritance is mostly about dynamic dispatch.
I understand how virtual pointer table based ...
