CSS div jumped when adding a border
When hovering into a div, we usually want to show that this div is highlighted, usually with different border.
"Working Experience" category
Align React Material UI Dialog to the top instead of center
We need to override two custom classes for Material Dialog component always to have it stick to the top.
TypeScript - Property 'onerror' does not exist on type 'EventTarget'
How to fix this kind of issue - Property 'onerror' does not exist on type 'EventTarget'
TypeScript data structure: Stack
My implementation for Stack using TypeScript
TypeScript data structure: Queue
My implementation for Queue using TypeScript
TypeScript data structure: Singly linked list
My implementation for singly linked list using TypeScript
Difference between: function Person(){}, var person = Person(), and var person = new Person()?
Have you seen this question before?
Warning: Can’t perform a React state update on an unmounted component
If you are a react developer, there is a good chance that you faced this warning at least once.
Angular - Set page title automatically!
Using a few lines of code could make the application feel much better!
Angular Singapore
Follow @angularsg for the upcoming events :)
A simple Spotify client built with Angular 11, Nx workspace, ngrx, TailwindCSS and ng-zorro
An example of real-world monorepo codebase using Nx Workspace
Nx Workspace structure for an application with NestJS and Angular
This structure has been serving us really really well by enforcing consistency, promoting SCAM, prevent circular dependencies, and minimize mental overhead of "where to put what"
SVG fill color doesn't work with hex colors
Because # in URLs starts a fragment identifier. So, in order to make that work, write %23 instead of #, that is the value of escaped # character.
TypeScript unknown vs any types
The main difference between unknown and any is that unknown is much less permissive than any: we have to do some form of checking before performing most operations on values of type unknown, whereas we don't have to do any checks before performing operations on values of type any.
Convert Promise to Observable
You'll need those tips one day if you get used to RxJS 🤣
Migrate Angular to ESLint
I'll show you how to migrate from TSLint to ESLint and using husky to run lint every time you try to make a commit
Capture picture from your Webcam in Angular
A simple walk through how to use the browser MediaDevices for capturing picture from a webcam in Angular
Observable for Angular Output
Do you know you can use Observable for Angular Output?
10 Modern CSS layout and sizing techniques
Learn a few layout tricks you can implement in your codebase today, and be able to write entire swaths of layout with just a few lines of code.
Build an Angular component to display snow ❄️ effect
The holiday session is coming. Let add a simple snow effect to your Angular application ❄️❄️❄️
Disable a reactive form control using custom directive
We will write a custom directive to disable a reactive form control by passing a boolean flag on the template
How to copy an object from the Chrome inspector console as code
Have you ever do console.log an object and wondering how can copy the object over?
How to configure TailwindCSS with Angular and why you should use it
This post gives you a glance at TailwindCSS and how to use it with Angular. If you're reading this and you don't know what TailwindCSS is, where have you been?
NPM vs Bower vs Browserify vs Gulp vs Grunt vs Webpack
Repost my killer answer on StackOverflow with more than 600 votes
Migrating my blog from Github to Gitlab, and deploy to Netlify
Still use Github for most of the work, but Gitlab for my blog
What is JavaScript Closure?
In short, a closure is not the function that is returned in another function. A closure is a combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). In other words, a closure gives you access to an outer function’s scope from an inner function
Angular - Using Visitor design pattern with Typescript
If you have multiple concrete classes that inherit from the same base class, or implement the same interface. You should consider using visitor pattern. It will save you from dozens of if-else block or switch/case and typecasting
Jekyll dark theme (minimal-mistake)
Once you go black you never go back :)
Understand and prevent the most common memory leaks in Angular application - Subscription unsubscribe
Remember to clean up your Rx subscriptions. In my experience, this is by far the most common cause of memory leaks in Angular applications
The different between [value] and [ngValue] when passing to select option
The different when using value and ngValue on Angular form
Lesson learn from Git branches
The goal of the game is to have as short-lived branches as possible (i.e. integrate often) while keeping the common branches (dev/patch) as stable as possible
Convert C# class to TypeScript interface
You could use an extension for VSCode for converting C# class to TypeScript class in a few seconds 🥰
Why I don't like ngrx and what are the alternative options?
I like the Redux concept. But not NgRx :)
JavaScript: Understanding the Weird Parts Notes
Below notes were taken from an Udemy course JavaScript: Understanding the Weird Parts
Angular async validator to validate an input field with a backend API
Write a custom async validator to validate an input field with a backend API in Angular reactive form
Angular - Correct singular/plural form of a noun using custom pipe or NgPlural
Pluralization is a problem in its sphere. We need to always correctly define grammar in our apps based on the singular/plural value
How to export a table or an array in Angular to Excel file (xlsx)
Export data to Excel is very useful on the data list for nearly every web application. The export feature helps to download the data list in a table as a file format for offline use
Limit the number of simultaneous ajax requests
Hoư to limit the number of simultaneous requests to 100, and queue up the rest
Angular formArray/formGroup - Validate at least one checkbox was selected
I prefer to use FormGroup to populate the list of checkbox. For checking at least one checkbox was selected, write a custom validator.
Restrict null and undefined via Non-Nullable-Types in TypeScript
null and undefined are the root of all evil. It often leads to runtime errors. It is easy to write code that will throw Error at runtime.
Error handling in JavaScript. Synchronous vs asynchronous code
Error handling in JavaScript has been always straightforward, at least for synchronous code
TypeScript - Declare a function callback type
To define the function callback type. You could declare an interface that has a call signature. Or define a new type
Angular [(ngModel)] and debounce
In the use case of search, we don't want to hit the server endpoint every time user presses a key, it should flood them with a storm of HTTP requests. Basically, we only want to hit it once the user has stopped typing after sometimes (for instance 300ms) instead of with every keystroke.
Casting a JSON object to a TypeScript class
Not all the time we need to cast from JSON object to a class, but sometimes it is really helpful. Use class-transformer to transform JSON object to class instance
Freeze screen in Chrome debugger / DevTools panel for inspect element that will disappear on hover/click
Run the setTimeout to trigger debugger before the element disappearing 🤓
Angular render recursive view using *ngFor and ng-template
How to use ng-template to render view recursive in Angular
Skiing in Singapore - a coding diversion
Another interesting tree traverse problem that could land you a job 🤓
npm - Check and update package if needed
Use npm outdated to check and upgrade package accordingly
CSS Layout - Horizontal & Vertical Align
Vertically center in CSS has never been an easy problem
How we handle time zone and locale at Zyllem
Using momentjs parseZone functionality for that purpose
Analyze webpack bundle with source-map-explorer. Optimize moment.js
I found that source-map-explorer tool shows an easy-to-understand-and-explore visualization to help you debug where all the code is coming from.
Uncaught TypeError: Cannot read property 'name' of undefined
It is a very common error when working with object and array to get a TypeError: Cannot read property 'name' of undefined. This happens when we try to access a property of a value that is undefined or null in JavaScript
The combination of debounce and throttle
Debounce and throttle are two techniques to control how many times we allow a function to be executed over time
Integrate Angular 2+ and Webpack in an ASP.NET MVC 5 application
I will summarize the steps needed to integrate Angular 2 and Webpack build process in an MVC 5 application
Spinning button onSubmit form with jQuery and ASP.NET MVC
At Zyllem, we are leveraging ASP.NET MVC 5 to build our product. So basically, almost 80% of our code base and UI stuff is doing as server side. 20% of the code is the client-side app written in JavaScript in AngularJS, and also TypeScript in Angular 2/4.
JavaScript naming convention
There are only two hard things in Computer Science: cache invalidation and naming things
Shrinking Navigation Bar When Scrolling Down - Bootstrap 3 Navigation & jQuery
In this tutorial, I will show you how to create an animated fixed navigation that will resize on scroll and when you scroll down the page a bit, the header resizes smaller, and gets back bigger when you scroll back to the top with just simple CSS3 animation and jQuery