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…
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…
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…
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 .
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:…
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…
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,…
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…
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…
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…
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;…