For example we want to create a pipe, to tranform byte to Mb. We using it in html like: <div> <div *ngFor="let file of files"> <p>{{ file.size | filesize: 'MB' }}</p> </div> </div> Create pipe: import {Pipe, P…

Also check: directive for form validation User input validation is a core part of creating proper HTML forms. Form validators not only help you to get better quality data but they also guide the user through your form. Angular comes with a series of…

User input validation is a core part of creating proper HTML forms. Form validators not only help you to get better quality data but they also guide the user through your form. Angular comes with a series of built-in validators such as required or ma…

Custom filter in AngularJS 1. Is a function that returns a function 2. Use the filter function to create a custom filter Let us understand creating custom filter with an example. Script.js : In the example below we are using the filter function to cr…

问: I'm trying to make a custom authorization attribute in ASP.NET Core. In previous versions it was possible to override bool AuthorizeCore(HttpContextBase httpContext). But this no longer exists in AuthorizeAttribute. What is the current approach to…

[问题] Our project is running on Windows CE 6.0 and is written in C++ . We have some problems with the code , and we are unable to debug . We also found out that if in our application we create threads and try to printf from them , the output won't app…

Instead of writing complex operators, it's usually best to write simple, single-purpose operators then chain them together when necessary. The pipefunction takes functions as arguments, invokes each function with the value, then passes the returned r…

how to create react custom hooks with arguments React Hooks & Custom Hooks // reusable custom hooks function useVar(type = `A`) { let var = `var${type}`; let setVar = `setVar${type}`; // re-declared bug const [var, setVar] = useState(0); useEffect(()…

Creating custom validators is easy, just create a class inject AbstractControl. Here is the form we want to validate it: form = this.fb.group({ store: this.fb.group({ branch: ['', [Validators.required, StockValidators.checkBranch]], code: ['', Valida…

If you're coming from AngularJS (v1.x) you probably remember the ng-true-value and ng-false-value directive which allowed to map custom boolean values like "yes" or "no" or whatever other value you had, onto your HTML form. In this les…