import { FormControl } from '@angular/forms';
import { Injectable } from '@angular/core'

export class ValidateBase{
 public static urlValidator(input: FormControl){
  let validateString = "(https?://|WWW|www|ftp://|file://)[-A-Za-z0-9+&@#/%?=~_|!:,.;]+[.]+[-A-Za-z0-9+&@#/%=~_|]";

  console.log(input.value);
  //set value 
  let v = input.value;

    if(v!=undefined&&v!="")
    {
     if(v.toLowerCase().match(validateString))
     {
      return null;
     }
     else{
     return {
      isUrl:true
     }
    }
    }
    return null;
 }
}

 

  LinkedURL:
  
  

   
LinkedURL can not be greater than 250 characters.
   
LinkedURL is not an url.
   
Required field.
   
   
Validate success!
  
 
 Log In

import { ValidateBase } from './../../Validators/Validator.base';
import { Component, OnInit } from '@angular/core';

import {
 FormGroup,
 FormBuilder,
 FormControl,
 Validators
 } from '@angular/forms';

@Component({
 selector: 'validate-component',
 templateUrl: 'validate.component.html'
 })

export class SweepstakesDetailComponent implements OnInit {

 private detailForm: FormGroup;
 private LinkedURL: FormControl;

 ngOnInit(): void {
  this.validateForm();
 }

 private validateForm(){

  this.LinkedURL = new FormControl('',[
   Validators.required,
   Validators.maxLength(250),
   ValidateBase.urlValidator
  ]);

  //form
  this.detailForm = this.formBuilder.group({
   LinkedURL:this.LinkedURL,
  });
 }
}