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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Using CSS classes as decorators - a good pattern?

I've been building a web-app with a fairly complex GUI - many small elements alongside eachother and within other elements that need various behaviours (dragging, clicking, but context-sensitive). My ...
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Javascript simple code to understand prototype-based OOP basics [closed]

I know Javascript for some time, although I am not a heavy user, I know it the first from the time when Netscape was my browser. I pretty much understand the main things, but since JavaScript approach ...
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Communication between decoupled components using events

We've got a Web App where we have a lot (>50) of little WebComponents that interact with each other. To keep everything decoupled, we have as a rule that no component can directly reference another. ...
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1answer
312 views

Why create a Global-ish Object.create function?

I'm a fairly experienced programmer in the .NET and Java realms, and I've started reading up on JavaScript. I bought Douglas Crockford's "The Good Parts" book, and I'm immediately put off by a few ...
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1answer
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Is there any reason not to make a webapp be client-side only?

I recently started writing a path-finding algorithm simulation application in python. It takes user inputs, randomly generates a 2d graph, and shows displays the simulation via GUI. Now, what I ...
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2answers
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Best practices / reasons for String constants in JavaScript [closed]

In static languages like Java/C#, I commonly make use of constants for strings or numbers, rather than insert them into the code alone. However, I tend to avoid this practice in JavaScript. More ...
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3answers
673 views

Is there a web-specific reason for the design choices behind the JavaScript language?

With the advent of "the web is the platform", JavaScript is fast becoming the most widely used programming language in the world. However, many tasks that are easy to accomplish in other modern ...
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1answer
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Node.js app private modules. Where to put them?

The situation would be: I develop 2 projects in my Node.js development environment, P1 and P2. P1 required the development of two simple modules, mod1 and mod2, which are stored in P1/lib. Each one ...
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3answers
954 views

How to properly validate your code?

I have about 4000 lines of code for a web-application in JavaScript / PHP / CSS / HTML. How can I test it properly? I only support the latest version of IE and Safari. I've worked out all the bugs. ...
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1answer
521 views

Language compiled to JS – most elegant way to do synchronous-style waits

I'm trying to make (yet another) language that compiles to JavaScript. One of the features I'd like to have is the ability to perform JavaScript's async operations synchronously (not exactly ...
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Practices for domain models in Javascript (with frameworks)

This is a question I've to-and-fro'd with for a while, and searched for and found nothing on: what're the accepted practices surrounding duplicating domain models in Javascript for a web application, ...
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336 views

Set of specific values implementation vs. using some sort of generic set with advanced checks

I am working on a set implementation in JavaScript currently. This should kind of simulate generics as known from Java or C#. I need a mutable version of that (allows for adding/removing set values) ...
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Should an SPA use OIDC's Implicit flow or Auth Code flow?

We are developing a new Angular SPA which leverages Keycloak for its SSO abilities using OpenID Connect (OIDC). The app is currently designed to use the Implicit flow to retrieve short-lived access ...
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1answer
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JavaScript objects and Crockford's The Good Parts

I've been thinking quite a bit about how to do OOP in JS, especially when it comes to encapsulation and inheritance, recently. According to Crockford, classical is harmful because of new(), and both ...
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2answers
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If I drop cookies with JavaScript will it still be compliant with the EU ICO Cookie Law?

The challenge proposed to me as to create a widget to apply in other sites that makes a website compliant with the cookie law[1]. Can I do this without changing server code? I mean, if there's code ...
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1answer
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HTML5 video sprites

I'm currently working on a project where there is a requirement to dynamically composite multiple synchronised video sources onto a single canvas. The initial prototype I put together loaded the video ...
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1answer
801 views

Order and filter Server-Sent-Events in angular.js eventsource

I have a Client in AngularJS where I consume multiple SSE (Server-Sent-Events) in Java from the Server Side (there are multiple endpoints in different web servers in the backend). Diagram link I ...
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Why do programming languages not let you use a try block without a catch block? [closed]

Why do languages demand catch blocks when they aren't needed? The compiler or parser complains with this code: try { const utils = require("applicationutils"); } But it is OK with this code: ...
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9answers
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Is it worth Learning XML as a web developer when JSON is better for AJAX? [duplicate]

Is it worth Learning XML as a web developer when JSON is better for AJAX? or is it better to concentrate on JSON/Javascript for AJAX?
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Why do browsers leak memory?

A colleague and I were speaking about browsers (using a browser control object in a project), and it appears as plain as day that all browsers (Firefox, Chrome, IE, Opera) display the same ...
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4answers
752 views

Readability of || statements

On HTML5 Boilerplate they use this code for jQuery: <script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script> <script>window.jQuery || document.write('<...
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4answers
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Clean, Modular Code vs MV* Frameworks [closed]

I've been hearing a lot about the "new" MV* frameworks. I've tinkered with KnockoutJS (I created an invoicing application), but I much prefer to write clean, modular code in raw JavaScript - ...
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3answers
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Have they missunderstood currying or have I?

This question is similar to the question posted on Does groovy call partial application 'currying'?, but not completely the same, and the answers given there do not really satisfy me. I would ...
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Is it bad design to internally call API endpoints from within the API instance?

For context, I am running a REST API built with Node.js. Because of callbacks and some complex DB calls, I have a chain of functions that are async but also unique, so it's tough to reduce redundancy. ...
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5answers
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Why JavaScript? What's the advantages? [closed]

This is not a simple question, but I was thinking, what advantages are really there in the JavaScript language? We all use JavaScript on the browser, of course, there is no other choice (you can use ...
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3answers
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Event-driven vs. 'reference'-driven programming (i.e. in JavaScript)

I haven't been able to find the appropriate terminology to search for content on the web related to what I'm asking, so I'm hoping someone on here can at least point me in the right direction. I'm a ...
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6answers
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I made an HTML5/Javascript game. Do I have to license it?

So I created an HTML5/Javascript online game. I host it on my website for anyone to play for free. I am still currently working on it. Do I need to license my game? And if so, what license do you ...
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Licensing a JavaScript library

I am developing a free, open-source (duh) JavaScript library, and wondering how to license it. I was considering the GNU GPL, but I heard that I must distribute the license with the software, and I'm ...
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2answers
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Why does Facebook obfuscate the names of CSS classes?

If you look at the source code of a website such as Facebook, you'll see many classes as such: <div class="_cy6 _2s24"><div class="_4kny"><div class="uiToggle _8-a _1kj2 _4d1i _-57 _5-...
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3answers
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Should I reduce event listeners by making functions more complex?

An example would be if you had multiple inputs, each of which effect a completely different process, (perhaps one changes a div's width, while another sends ajax request for predictive search), would ...
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3answers
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How do you unit test a User Interface? [closed]

I use JavaScript with JQuery for a Rails application. I have some dynamic behaviour in this one. As a Ruby developper, I like TDD/BDD, specialy with RSpec. For the moment, I test my JavaScript manualy....
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2answers
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Where is the evidence for the performance of Node.js?

A lot of developers, especially ones who haven't used Node.js in production, seem to believe that Node.js is faster than other interpreted languages such as PHP, Python, and Ruby. These claims ...
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Building a web application that is almost completely rendered by Javascript, while back end only delivers Json. Do or don't?

As a programmer, and taking into account the overall "funness" of the process, I'm tempted to start a project in Sinatra where the back end's sole concern is the logic, and returning a Json API, and ...
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2answers
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Does javascript support numerically indexed arrays with a more optimized algorithm than an associative array?

I know that Python, Perl, Java, Lua and obviously C (as it's the only array that's in ANSI standard afaik) support faster looking of numerically indexed arrays than doing a hash lookup or anything ...
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3answers
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Backbone/JQuery, ExtJs 4… is there something else worth looking?

Im currently evaluating a front-end architecture for a big app that will be developed by a team of about 6 developers + 1 web designer so that said, having a robust SVN friendly architecture is a must....
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4answers
861 views

In CI, should tests be run against src or dist?

I've had a dispute with a colleague about when to run JavaScript unit tests in a CI environment at one of two different times. Let's call the two parties PE (pro-early) and PL (pro-late). Early (...
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2answers
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Is it considered bad practice to compile into Javascript as a matter of language preference? [closed]

I understand that compiling into Javascript is sometimes necessary and even in some cases results in a faster application. However I'm wondering if compiling into Javascript, for building web ...
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2answers
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front end development test - html/css/jquery/javascript

We are continually revamping our front end developer test that we do in-house after a candidate has passed an online test. The online test has questions such as: How does a for loop start? What is ...
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2answers
5k views

Keeping client side model and server side in sync in SPAs

Since SPAs have most of their domain logic client side, how do you keep your domain model in sync with the back end? For example, let's say I have a .NET WebAPI web service that uses the Entity ...
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2answers
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Web development in a small team - best practices

Currently developing a web app in a team of two maybe three in the near future. Tech stack is at the moment : flask, mongodb, and extjs for the fontend. I currently have the project under version ...
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4answers
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Best way to do Client side authorization for a single page JavaScript application?

I already have a solid back-end permissions authorization (ie. admin can perform an action, a normal user cannot perform an action). However, I'm wondering if there is a better way to do a frontend ...
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2answers
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Memory usage of JavaScript string type with identical values

JavaScript string type is immutable, but does it mean identical strings will share memory? Say two strings are created in complete different places, will a modern JavaScript engine be smart enough to ...
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1answer
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What are the advantages of RxJS Observables over promises? [closed]

It seems to me like Observables are basically wrappers for promises with some helper methods. It also requires a huge library to go along with it. Do the benefits of these helper methods outweigh the ...
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4answers
953 views

in dynamic language like javascript how do you know what the argument is?

In Java or Scala if I have an argument configuration: Conf, I can look for Conf class/trait/case class and see its construct so I know which arguments to pass. Recently I started dealing with ...
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2answers
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How to test functions or the code inside $(document).ready() using Jasmine?

I have multiple functions and a lot of code inside $(document).ready(function()). I am using jasmine to test the functions inside the ready function as well as the code inside ready() but when the ...
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3answers
562 views

is this javascript property defaulting pattern a code smell?

In some javascript code I'm working on refactoring I've handled cases where I wanted to default an object property to true without having to go through the code-base and add the property to every ...
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2answers
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Correct echoing of html in js?

A colleague and I were discussing how to echo HTML inside of javascript code. Specifically, in a situation similar to this: new Element('div', { html: '{long string of HTML goes here!}' }.inject($...
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3answers
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JavaScript for a non-programmer [closed]

2 years ago I starded learning AS3 in order to get hired at a web design company. A few months later, I ditched it, because I discovered that I'm better at design; so now I'm a web designer. Recently,...
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4answers
7k views

Function that modifies an argument, should I return the modified object?

We have a function that modifies a JS object, by adding some custom properties to it. The function doesn't return antyhing addTransaction: function (obj) { obj.transactionId = this....
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6answers
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Triggering custom events in AJAX callbacks

I'm pretty new to JavaScript, but one of the things that's been frustrating is that our AJAX callbacks have been getting packed with different functionality, making it difficult to keep everything ...