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How does angular method decorator work?


How does angular method decorator work?

By : Trent Schippers
Date : November 22 2020, 03:01 PM
I think the issue was by ths following , throttle is a property decorator and it means that it's job is usually to modify the class (object) property descriptor. The descriptor before the modification has the value pointing to scroll function:
code :
{
  value: scroll() { console.log('scroll'); },
  ...
}
function ( target : any, propertyKey : string, descriptor : PropertyDescriptor ) {
   // save original value 'scroll'
   const original = descriptor.value;
   // overwrite original value with the decorated function returned by `t`
   descriptor.value = t(original, milliseconds);
   return descriptor;
};


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Getting a decorator with args to work with method: self does not exist

Getting a decorator with args to work with method: self does not exist


By : haeyoche
Date : March 29 2020, 07:55 AM
This might help you If you want to use an existing decorator function on an instance method, note that you can redefine instance methods in __init__, calling the decorator directly rather than using the @ syntax:
code :
class MyCls(object):

    def __init__(self):
        self.val = 1
        self.onefrom1 = dodecorate(self.val)(self.onefrom1)

    def onefrom1(self, x):
        return x
>>> a = MyCls()
>>> for x in range(3):
    print a.onefrom1(x)


0
one
2
Angular: Why lazy-loading a decorator doesn't work?

Angular: Why lazy-loading a decorator doesn't work?


By : RomaNNN
Date : March 29 2020, 07:55 AM
help you fix your problem As you know, AngularJS has 2 distinct phases during bootstrap:
configuration phase run phase
Difference between providers of Component decorator and NgModule decorator in Angular 2

Difference between providers of Component decorator and NgModule decorator in Angular 2


By : ElyotChou
Date : March 29 2020, 07:55 AM
will be helpful for those in need The difference is the scope where a provider is available and how many instances will be created.
instance per provider
Angular - Custom method decorator which triggers console.log() at the beginning and end of a method

Angular - Custom method decorator which triggers console.log() at the beginning and end of a method


By : Zebastian Persson
Date : March 29 2020, 07:55 AM
wish help you to fix your issue A method decorator does exactly what you want to do. It intercepts the call of the decorated method. So you are able to log before and after the call of the decorated method.
log.decorator.ts
code :
export function log( ) : MethodDecorator {
  return function(target: Function, key: string, descriptor: any) {

    const originalMethod = descriptor.value; 

    descriptor.value =  function (...args: any[]) {

      console.log(`Entering ${key} method`);
      const result = originalMethod.apply(this, args);
      console.log(`Leaving ${key} method` );

      return result;
    }

    return descriptor;
  }
}
import { Component, Input } from '@angular/core';
import { log } from './log.decorator';

@Component({
  selector: 'hello',
  template: `<h1>Hello {{name}}!</h1>`,
  styles: [`h1 { font-family: Lato; }`]
})
export class HelloComponent {
  @Input() name: string;

  @log()
  ngOnInit() {
    this.Add(10, 32);
  }

  @log()
  private Add(a: number, b: number) : number {
    return a +  b;
  }
}
Entering ngOnInit method
Entering Add method
Leaving Add method
Leaving ngOnInit method
Angular service is undefined in component method with custom TS decorator

Angular service is undefined in component method with custom TS decorator


By : Yuliyan T.
Date : March 29 2020, 07:55 AM
wish help you to fix your issue If you immediately return a descriptor from your decorator, you should not use the braces (). Also the this context is lost, try using the this which is in the descriptor value. Besides that, when you use apply, you should not use the spread operator. If you want to use that, you have to use call:
code :
function myCustomDecorator(target: any, propertyKey: string, descriptor: PropertyDescriptor) {
  const originalValue = descriptor.value;
  descriptor.value = function(this: Function, ...args: any[]) {
    const result = originalValue.call(this, ...args);
    // or --> const result = originalValue.apply(this, args);
    //Do some other stuff
    return result;
  }
  return descriptor;
}
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