Html – Formatting a form input field
How can you format a form input field such that it only accepts numbers from users, takes a maximum of 16 digits, and adds a space after each four digits? I am trying to create a debit card such that…
Magento – Storing product attributes of different types in a product aggregate
I use the EAV (Entity-Attribute-Value) pattern in an inventory management system I'm developing. It's very comparable to a typical webshop framework like Magento. Attributes have a data type, like numeric, varchar, text. The attribute definitions are stored in one table…
How to create under the label in Textformfield, not a border, in Flutter
I want to create a Textformfield. But the label shows under the Textformfield, not the border. And Textformfield corner is rounded and the validation error is below the Textformfield. How to achieve in this type UX design in flutter .
Create widget in flutter
I'm trying to create this widget here This is the result I got, I'm having trouble limiting the size of the widget without decreasing the text SizedBox( height: 90, width: double.infinity, child: ListView.builder( itemCount: 10, shrinkWrap: true, padding: const EdgeInsets.symmetric(vertical:…
Javascript – Passing Methods vs Generic Objects vs Event Specific Objects
I often reach a crossroad in my code when it comes to passing methods vs generic objects vs specialised objects. Let me explain. I am using the mediator pattern. I have DAO's which have generic methods based on a specific…
Facebook api – How to properly organize models in an application and the interaction of various layers?
I have an application in Domain Driven Design that links user profiles from different social networks. For example, let's say it's Facebook and Twitter. APIs return a User objects. These User objects are required for the custom RegisteredUser, that is,…
Paypal api – Design approach for safely picking between multiple payment methods
We need to dynamically support multiple payment methods (credit, paypal, google pay, etc...). We can change the gateway we use to implement a certain payment method. For example: PayPal payment method can be implemented today by using Stripe SDK, and…
Javascript – How can I "augment" a JS class with methods from another class, without extending it?
I'm writing an app that manages playlists. Basically, my actual logic looks like //define playlist props class Playlist{ public tracks = []; } class ApiPlaylist extends Playlist{ //fill playlist withs (single page) data from API public async loadPage(paginationSettings){ const pageTracks…
Php – How do I use objects to represent data from my relational database without making an excessive number of database queries?
I'm trying to design my first complex object-oriented PHP application and I'm confused about how to use objects to represent data from my database. More specifically I'm confused about how to combine multiple objects without making a huge number of…
Javascript – Why is this code not in a singleton pattern?
According to the design rules, a singleton pattern must exist in an instance. If I remove the line of code and return an object, will the function be a single pattern? const singleton = (function(){ let instance, counter = 0;…