ngJoyValidators - Angular Reactive Custom Validators

Welcome to ngJoyValidators! This feature-packed library serves up advanced and conditional validation features for your Angular reactive forms. Compatible with Angular versions 12 through 16, it's super light on size but heavy on functionality and flexibility. Packed with a suite of around 43 validators and a bonus set of 7 conditional validators for tackling more complex scenarios, ngJoyValidators has all your reactive form needs under control.

🚀 What can ngJoyValidators do?

Here's a taste of what you can expect:

⚡ Efficiency: ngJoyValidators is designed to be light on resources. Despite offering a rich feature set, it has zero internal third-party dependencies and maintains a small footprint.
🎨 Customizable: We believe in flexibility. That's why our validators are highly customizable, ready to accommodate the unique requirements of your project.

🧩 Conditional Validators: you won't find anywhere else

📚 Demo Project

To help you get started and showcase what ngJoyValidators is capable of, we've put together an Angular workspace project complete with components demonstrating several validators. Whether you're new to ngJoyValidators or looking to explore more advanced use-cases, our demo project is a great place to start. https://github.com/BLRAJS/ngjoy-reactiveValidators

💾 Installation

To add ngJoyValidators to your project, simply run the following command in your terminal:

npm i @ngjoy.dev/reactivevalidators

Import modules

To utilize form features, import the FormsModule, ReactiveFormsModule, and NgJoyValidatorsModule into your NgModule decorator.

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule, ReactiveFormsModule} from '@angular/forms';// <-- #1
import { NgJoyValidatorsModule } from '@ngjoy.dev/reactivevalidators';
import { AppComponent } from './app.component'; 

 @NgModule({    
 declarations:[AppComponent],   
  imports:[ BrowserModule, FormsModule, ReactiveFormsModule, NgJoyValidatorsModule ],  
 bootstrap: [AppComponent] 
 }) 
 
export class AppModule { }

In your component

just add NgJoyValidatorsService and you have access to all validators

import {NgJoyValidatorsService} from "@ngjoy.dev/reactivevalidators";

constructor(private ngJoyValidatorsService: NgJoyValidatorsService) {
}

Reactive Form Validation

🧩 Conditional Validators: One of the unique features of ngJoyValidators is the ability to add / remove / compare/ disable / co-require on or more validators conditionally based on a dependency value from another field or same fields.

conditionalValidators
coRequiredValidator
conditionalRequiredValidator
greaterThan
lessThanEqualTo
greaterThanEqualTo
lessThan

🌈 Versatility: With around 50 validators at your disposal, you'll have a tool for nearly every situation. No matter the complexity of your form or the specific rules you need to enforce, ngJoyValidators has got you covered.

ibanValidator
creditCard
cvv
expiryDate
sumOfFields
asciiValidator
allFieldsFilled
minMaxArrayLength
scriptLanguageType
sanitizeInput
digitValidator
emailDomain
endsWith
even
extension
factor
file
fileSize
ip
noWhitespace
json
latitude
latLong
leapYear
longitude
lowerCase
mac
maxDate
maxNumber
minDate
minNumber
numeric
odd
oneOf
password
port
primeNumber
range
startsWith
time
unique
upperCase
url

conditionalValidators

The conditionalValidators function is a validator factory that attaches validators to a form control conditionally. The conditions are based on the value of another form control in the same form group.

Use Cases:

Dependent Form Fields: This function can be used in cases where the validation of a form field depends on the value of another field. For instance, let's say we have a form with a "country" select field and a "state" input field. The "state" field should be required only if the "country" field is set to "United States". In this case, the conditionalValidators function can be used to add the Validators.required validator to the "state" field only if the "country" field value is "United States".
Dynamic Form Validation: In cases where the form validation requirements change based on the user's input, this function allows developers to easily apply different validation rules on-the-fly. For example, in a checkout form, if the user selects "credit card" as the payment method, the form needs to validate credit card related fields, but if "paypal" is selected, those validations are not necessary.

The function can take an optional conditionalCheck function. This function can be used to provide a custom condition instead of the default one. The custom condition could be based on complex logic involving multiple form controls.

// In a registration form, the conditionalValidators function is used to apply the Validators.
// required validator on the promoCode text field only when the hasPromoCode checkbox is checked.
this.registrationForm = this.fb.group({ 
  hasPromoCode: [false],  
  promoCode: ['', this.conditionalValidators<boolean>( 'hasPromoCode', Validators.required, value => value === true )]
});

// In an article submission form, the conditionalValidators function applies Validators.required 
// and Validators.min(1) on the imageCount field only if the hasImages checkbox is checked. 
// This ensures that a user enters the number of images (greater than 0) only when they've 
// indicated they are including images.
this.articleForm = this.fb.group({ 
  hasImages: [false],  
  imageCount: ['', this.conditionalValidators<boolean>( 'hasImages', 
    [Validators.required, Validators.min(1)], value => value === true )] 
});  

// The studentForm has three fields: 'age' (required), 'isStudent' (optional), 
// and 'guardianContact' which is required only when the user is a student and their 
// age is less than 18.
this.studentForm = this.fb.group({ 
  age: ['', Validators.required],  
  isStudent: [false],  
  guardianContact: ['', this.conditionalValidators<boolean>( 'isStudent', [Validators.required],  
 (isStudent, formControl) => isStudent && formControl.parent?.get('age')?.value < 18 )]
});  
  
// The testGroup form contains two fields: 'firstName' and 'email'. The 'email' field is 
// conditionally required and must end with 'gmail.com' only when the 'firstName' field is 
// filled with "James" or the 'email' itself includes "test".
this.testGroup = this.fb.group({
  firstName: [''],  
  email: ['', [this.ngJoyDynamicValidatorsService.conditionalValidators<string>('firstName',    
  [Validators.required, this.ngJoyValidatorsService.endsWith('gmail.com', "Only gmail.com please")],    
  (value: any,emailControl:FormControl) => value === "James" || emailControl.value.includes("test"))]]
});

 //In an online product listing form, certain fields like product details and review comments
// become conditionally required based on the type of product and its rating, showcasing the
// dynamic nature and flexibility of conditionalValidators.

this.productListingForm = this.fb.group({
  productName: ['', Validators.required],
  productPrice: ['', [Validators.required, Validators.min(1)]],
  productCategory: ['', Validators.required],
  productDetails: ['', this.conditionalValidators<string>('productCategory',
      [Validators.required],
      (productCategory) => productCategory === 'electronics' || productCategory === 'books'
  )],
  productRating: [5, [Validators.min(1), Validators.max(5)]],
  reviewComments: ['', this.conditionalValidators<number>('productRating',
      [Validators.required],
      (productRating) => productRating < 3
  )],
  hasPromotion: [false],
  promotionPrice: ['', this.conditionalValidators<boolean>('hasPromotion',
      [Validators.required, Validators.min(1)],
      (hasPromotion, formControl) => hasPromotion === true && formControl.value < formControl.parent?.get('productPrice')?.value
  )],
  hasShipping: [true],
  shippingCost: ['', this.conditionalValidators<boolean>('hasShipping',
      [Validators.required, Validators.min(0)],
      (hasShipping, shippingControl) => hasShipping === true && ((shippingControl.value > 0 && shippingControl.value < formControl.parent?.get('productPrice')?.value * 0.1) || shippingControl.value === 0)
  )]
});

// let's break it down!

// productCategory: This is a field in which the seller is required to input the category of 
// the product they're listing. It could be any string, but for the purpose of this form, 
// we're considering the validation for 'electronics' and 'books'.

// productDetails: This field is a conditional field that's dependent on the productCategory. 
// As per our form design, detailed product information is necessary when the product belongs 
// to 'electronics' or 'books' category. This is implemented using conditionalValidators, which
// make productDetails a required field only when the productCategory is either 'electronics' 
// or 'books'.

//productRating: This field represents the rating of the product, where the seller can 
// specify a rating between 1 and 5.

//reviewComments: This is another conditional field that depends on the productRating. 
// If the productRating is less than 3, the form expects the seller to provide review 
// comments to justify this low rating. Again, conditionalValidators is at work here, 
// making reviewComments a required field only when the productRating is less than 3.

//Now, why is this so amazing? The power and flexibility of conditionalValidators lie in their 
// ability to adapt to different conditions, enhancing the dynamics of form validation.

  //It allows you to handle multiple scenarios within your form, reducing the complexity and
// the number of checks you would have to perform otherwise. It provides a highly flexible
// approach to handle form validation by not only allowing conditions based on other fields'
// values, but also based on the field's own value, like we did with promotionPrice and 
// shippingCost.

 // In addition, by providing an easier way to create dynamic forms, it enhances the user 
// experience. It only enforces validation rules when it's needed, avoiding unnecessary inputs 
// from users, and making the form filling process more intuitive and efficient. 
// This is particularly beneficial in complex forms with many fields and rules.

//In summary, conditionalValidators is a supercharged validation mechanism that brings both 
// power and flexibility to your forms, making them smarter, more dynamic, and user-friendly.
// It's a great tool for developers to create advanced forms with complex validation scenarios.

conditionalRequiredValidator

This conditionalRequiredValidator function is a custom validation function in Angular. It checks whether a certain field is required based on the condition evaluated on another dependent field.

//first use Case  
this.sampleForm = this.fb.group({ 
 checkbox: [false],  
 checkboxDependent: [null, this.conditionalRequiredValidator( 'checkbox', control => control.value === true)] 
});   
 
//second use case  
this.sampleForm = this.fb.group({ 
  selectField: ['defaultOption'],  
  dependentField: [null, this.conditionalRequiredValidator( 'selectField', control => control.value === 'specificOption','This field is required when specific option is selected in the dropdown.' )] 
});

coRequiredValidator

coRequiredValidator is a custom validator that checks if at least one of a group of controls has a value. This could be useful when you have a situation where a user must provide at least one type of contact information, such as a phone number or an email, but you don't mind which one they provide

this.demoForm = this.fb.group({    
  email: ['',[this.ngJoyDynamicValidatorsService.coRequiredValidator('email', 'phone', 'Either field1 or field2 is required.')]],    
  phone: ['',[this.ngJoyDynamicValidatorsService.coRequiredValidator('email', 'phone', 'Either field1 or field2 is required.')]]
});

ibanValidator

The ibanValidator function is a validator function for International Bank Account Numbers (IBAN). It takes an optional error message object as a parameter and returns a ValidatorFn that is used to validate form controls. The following are the key steps that this function is performing:

Extracting Country Code: It starts by extracting the country code from the IBAN. The country code in an IBAN is always the first two characters.
Country Support: The function checks if the country code extracted from the IBAN is supported or not. This is done by checking the ibanCountries
Length Check: Next, it checks if the length of the IBAN matches the length defined for the country in the ibanCountryLengths object.
Rearranging and Converting Characters to Numbers: If the country is supported and the length is valid, the function then rearranges the IBAN by moving the first four characters to the end. This is followed by converting any letters in the IBAN to their equivalent numeric values.
Performing Mod-97 Operation: The validator then performs a Modulo-97 operation on the resulting number. This is an essential part of the IBAN validation as per the international standard.
Final Validation Check: Finally, if the remainder from the Mod-97 operation equals '1', the function concludes that the IBAN is valid, otherwise, it returns an error.

This function follows the official procedure for validating an IBAN and provides detailed error messages when the validation fails at any step. This allows for better debugging and user feedback.

 this.paymentForm = this.fb.group({     
  iban: ["",[this.ngJoyValidators.ibanValidator()]]  
});

creditCard

The validation process involves a few steps:

The function first checks if the control's value is not empty. If it's empty, it returns null, indicating no errors.
Next, it checks if the input value consists only of digits. If the input contains non-digit characters, it's considered invalid and an error message is returned.
Then, the function checks if the credit card type is detectable based on the card type -

American Express (amex)
China UnionPay (china_union)
Dankort (dankort)
Diners Club (diners)
Discover (discover)
Elo (elo)
Hipercard (hipercard)
JCB (jcb)
Maestro (maestro)
Mastercard (mastercard)
Visa (visa)
MIR (mir)
NSPK (nspk)
Troy (troy)
Visa Electron (visa_electron)
RuPay (rupay)
Interpayment (interpayment)
Instapayment (instapayment)
Aura (aura)
CardGuard (cardguard)
If the card type can't be determined, the function returns an error message, considering the input invalid.

Lastly, the function runs Luhn's algorithm on the input. Luhn's algorithm is a common checksum algorithm used to validate a variety of identification numbers, especially credit card numbers. If the card number fails this checksum test, it is considered invalid and an error message is returned.
If the input passes all these tests, the function returns null, indicating no errors in the input, and hence the credit card number is valid.

So, in essence, this function validates if the entered credit card number is formatted correctly , it match a type , and if it could be a plausible credit card number by applying the Luhn algorithm.

 this.paymentForm = this.fb.group({    
  cardNumber: ['', [this.ngJoyValidators.creditCard('Please enter a valid card number.')]]  
});

sumOfFields

The sumOfFields function is a validator that validates if the sum of specified fields in a FormGroup matches an expected value. Here's how it works:

Fetch Field Values: It first maps over the array of field names (passed as fields), using the get method on the group object (which is the FormGroup the validator is attached to) to retrieve the corresponding form controls. It gets the value from each control, parsing it as a float if it exists, or using 0 if the control is not present or its value is falsy.
Calculate Total Sum: It then reduces this array of field values into a single sum (i.e., it adds all of the values together).
Compare With Expected Value: It compares this sum to the sumValue parameter that was passed in. If they are not equal, it returns a validation error with the provided errorMessage. If they are equal, it returns null, signifying no error.

This function can be useful when you have a form where certain fields need to add up to a specific total. For example, it might be used in a budgeting app where the user is inputting amounts for different categories, and you want to make sure they add up to the total budget

this.myForm = this.fb.group({   
 field1: [0],  
 field2: [0],
 field3: [0],
 field4: [0]
   }, { validators: this.validationService.sumOfFields(['field1', 'field2', 'field3'], 100, 'The sum of fields must be 100.') }  
);

asciiValidator

Allows user to enter the input which is in ascii format only.

 firstName: ['', [    
  this.validationService.asciiValidator('Name can only contain ASCII characters.'),
 ]],

allFieldsFilled

The allFieldsFilled function is a custom validator that checks if all the controls within a FormArray are valid. A FormArray in Angular represents an array of AbstractControl, where each control in the array can be a FormGroup, FormControl, or another FormArray.

When this validator is used on a FormArray, it iterates through all the controls in the array. If it finds any control that is not valid (i.e., fails validation checks specified on that control), it will return an error object {allFieldsFilled: {valid: false, message}}. Here valid is set to false, indicating that the validation failed and message is the error message you pass when calling allFieldsFilled() method.

If all the controls in the FormArray are valid, it will return null, which means there is no error and the validation passed successfully.

This validator can be useful when you have a dynamic form where users can add or remove fields (or sets of fields), and you want to ensure that every field in the form is filled before the form is submitted.

 aliases: this.fb.array([    
   this.fb.control('')
  ],
    {validators: [this.ngJoyValidatorsService.allFieldsFilled()]
 })

minMaxArrayLength

The minMaxArrayLength function is a custom validator in Angular that checks if the length of an array falls within a specified range, defined by the min and max parameters. This validator can be used for validating FormArray instances in Angular forms.

 aliases: this.fb.array([    
   this.fb.control('')
   ], {validators: [this.ngJoyValidatorsService.minMaxArrayLength(3, 7, "Min 3 aliases", "Max 7 aliases")]
})

creditCard

creditCard validation will check property value is creditcardtype or not, It will not allow to enter any value other than credit card format.

Card Type	Card Number	Expiry Date	CVV
American Express (Amex)	3700 0000 0000 002	03/2030	7373
China UnionPay	6243 0300 0000 0001	12/2029	737
Dankort	5019 5555 4444 5555	03/2030	737
Diners	3600 6666 3333 44	03/2030	737
Discover	6011 6011 6011 6611	03/2030	737
Elo	5066 9911 1111 1118	03/2030	737
Hipercard	6062 8288 8866 6688	03/2030	737
JCB	3569 9900 1009 5841	03/2030	737
Maestro	6771 7980 2100 0008	03/2030	737
Mastercard	5555 3412 4444 1115	03/2030	737
Visa	4166 6766 6766 6746	03/2030	737
Mir	2200 0000 0000 0002	03/2030	737
Troy	9792 0000 0000 0000	03/2030	737
UATP	1354 1234 5678 911	03/2030	737
RuPay	6521 5115 9161 3100	03/2030	737
Interpayment	6360 2900 4907 3813	03/2030	737
InstaPayment	6394 9394 9304 4961	03/2030	737
CardGuard	5392 3192 3192 3190	03/2030	737

this.paymentForm = this.fb.group({    
  cardNumber: ['', [this.ngJoyValidators.creditCard('Please enter a valid card number.')]],    
  expiryDate: ['', [this.ngJoyValidators.expiryDate('Card has expired.')]],    
  cvv: ['', [this.ngJoyValidators.cvv('Invalid CVV.')]] 
});

scriptLanguageType

This custom validator checks if the input text of a control follows a specific script (writing system). You specify the name of the script when using this validator and it will ensure that all characters in the input string are from that script.

In other words, you can use this validator to enforce that an input field should only contain characters from a certain script such as Latin, Cyrillic, Armenian, Greek, Arabic, Hebrew, Devanagari, Bengali, Thai, Chinese, Japanese Hiragana, Japanese Katakana, or Korean.

 scriptExample: ['', [    
  this.validationService.scriptLanguageType('Latin', 'Input must only contain Latin script characters.') 
]],

sanitizeInput

This function provides a custom validator named sanitizeInput, which is used to check if the input of a form control contains any potentially harmful scripts, malicious code, or elements that could be used for cross-site scripting (XSS) attacks , this validator helps to sanitize user input by preventing the inclusion of harmful scripts or elements that could compromise the security of your web application.

this.validationService.sanitizeInput('Input must not contain scripting.') ]],

cvv

The CVV (Card Verification Value) validator ensures that the provided CVV is a valid 3-digit or 4-digit number, depending on the card type. If not, it returns a validation error.

cvv: ['', [this.ngJoyValidators.cvv('Invalid CVV.')]]

expiryDate

This validator checks whether the given credit card expiration date (expressed in the format "MM/YYYY") has already passed or not. If the expiration date is in the past, it returns a validation error.

  expiryDate: ['', [this.ngJoyValidators.expiryDate('Card has expired.')]],

digitValidator

Can only contain digits. It will not allow any alphabets or special character.

this.validationService.digitValidator('Personal Digit Number can only contain digits.') ]],

emailDomain

Checks if the input is a valid email address and its domain mustmatch specific domain

  Validators.email,    
this.validationService.emailDomain(['example.com'], 'Email domain must be example.com.') ]],

endsWith

Input value must ends with specifci value , _ is similar to Contains() , but validates only if the value is at the end of the input

 firstName: ['', [this.ngJoyValidatorsService.endsWith("lee", "You are not originally from Asia your name must end with ...lee")]],

even

Value entered is an even number or not.

 evenField: ['', this.validationService.even('Value is not an even number.')],

extension

Check the proper extension format.

 extensionField: ['', this.validationService.extension(['png', 'jpg', 'gif'], 'File extension not allowed.')],

factor

check for dividend.

 factorField: ['', this.validationService.factor(100, 'Value is not a factor of 100.')],

file

Allows user to validate maxFiles and minFiles for input type file

 fileField: ['', this.validationService.file(2, 5, 'Number of files is not within the specified range.')],

fileSize

Validate the the maximum allowed upload size , for input type file

 fileSizeField: ['', this.validationService.fileSize(100000, 'File size exceeds the maximum allowed size.')],

greaterThanEqualTo

custom validator that checks whether the value of the given form control is greater than or equal to the value of the specified related field. If it is less, it returns a validation error.

  this.transactionForm = this.fb.group({  
  balance: [1000],
  newBalance: [0, [this.greaterThanEqualTo({fieldName: 'balance'}, "New balance cannot be less than the current balance")]],
  });

greaterThan

Greater than checks whether the value of the given form control is strictly greater than the value of the specified related field. If it's less or equal, it returns a validation error.

  this.transactionForm = this.fb.group({  
 balance: [1000], newBalance: [0, [this.greaterThan({fieldName: 'balance'}, "New balance cannot be greater than the current balance")]], });

noWhitespace

noWhitespace validation will check for empty or white spaces.

 lastName: ['', [    
this.validationService.noWhitespace('Name can not contain whitespaces.') ]],

ip

Checks if the input is a valid IPv4 or IPv6 address.

 ipField: ['', this.validationService.ip({versions: [4, 6]})],

json

Check for proper valid Json format.

 jsonField: ['', this.validationService.json("Invalid JSON format")]

latitude

Check if value is valid latitude.

 latitudeField: ['', this.validationService.latitude("Invalid latitude value")],

leapYear

Check whether the value is a leap year or not.

 leapYearField: ['', this.validationService.leapYear("Not a leap year")],

latLong

Check if value is valid Latitude or longitude.

 latLongField: ['', this.validationService.latLong("Invalid latitude or longitude value")],

lessThanEqualTo

Validator that checks whether the value of the given form control is less than or equal to the value of the specified related field. If it's more, it returns a validation error.

  this.transactionForm = this.fb.group({  
 balance: [1000], withdrawal: [0, [this.lessThanEqualTo({fieldName: 'balance'}, "Withdrawal cannot exceed balance")]], });

lessThan

validator that checks whether the value of the given form control is strictly less than the value of the specified related field. If it's more or equal, it returns a validation error.

 this.form = this.formBuilder.group({  
 startHour: [8], endHour: [12, this.Validators.lessThan({fieldName: 'startHour'})],});

longitude

Check whether the value is a valid longitude or not.

longitudeField: ['', this.validationService.longitude("Invalid longitude value")],

lowercase

Check whether the value is a lowercase or not.

lowerCaseField: ['', this.validationService.lowerCase("Only lowercase letters are allowed")],

mac

value entered is a valid mac address.

 macField: ['', this.validationService.mac("Invalid MAC address")],

maxDate

This function, maxDate, is a custom validator for Angular forms. It checks if the input date is less than or equal to a specified maximum date. The validator function takes a configuration object that specifies the maximum date value, date format, and an optional error message.

maxDateField: ['', this.validationService.maxDate({    
  value: "02-06-2023",    
  format: "DD-MM-YYYY",    
  message: "Date must be less than or equal to the maximum date." })],

maxNumber

Check for maximum number value parameter.

 maxNumberField: ['', this.validationService.maxNumber({value: 100})],

minDate

It checks if the input date is less than or equal to a specified maximum date. The validator function takes a configuration object that specifies the maximum date value, date format, and an optional error message.

 minDateField: ['', this.validationService.minDate({    
  value: "01-01-2020",    
  format: "DD-MM-YYYY",    
message: "Date must be greater than or equal to the minimum date." })],

minNumber

Check if Input is greater than the minimum number value parameter.

 minNumberField: ['',this.validationService.minNumber({value: 10})],

numeric

numeric validation will check whether the value entered is a valid numeric value , based on criteria we want

  numericField: ['', this.validationService.numeric({    
   acceptValue: NumericValueType.PositiveNumber,    
   allowDecimal: true,    
   message:"Value must be a valid numeric value only" })
  ],

odd

value entered is an odd number or not.

oddField: ['', this.validationService.odd("Value must be an odd number only")],

oneOf

Check whether the user has entered any one of the given inputs or not.

lastName: ['', [this.ngJoyValidatorsService.oneOf(["Pacino", "Deniro", "Afleck"], "Your last name can be Pacino, Deniro, Afleck")]],

password

Will allow user to enter input value according to correct password validation format.

 password: ['', [this.ngJoyValidatorsService.password({  
 validation: { minLength: 5, maxLength: 10, digit: true, specialCharacter: true }, message: 'Password must have at least one digit, one special character, and be between 5 and 10 characters in length.' })
 ]],

port

Test is the value entered is valid port number.

portField: ['', 
this.validationService.port({message: 'Invalid port number.'})
],

primeNumber

check if the value typed is only prime number.

 primeNumberField: ['', this.validationService.primeNumber({message: 'Value must be a prime number.'})],

range

Check if the value is within the specific range

age: ['', [this.ngJoyValidatorsService.range({    
minimumNumber: 18,    
maximumNumber: 65,    
message: "You are qualified to join the army if you are between 18 and 65" })
]],

startsWith

Check if values starts with specific value.

phone: ['', [this.ngJoyValidatorsService.startsWith("40", "You phone number must be Austrian ,must start with 40")]],

time

Allow user to enter the input value is only in the correct time type.

timeField: ['', this.validationService.time({format: '24'})],

unique

The unique function is a checks whether the value of the field it is applied to is unique within the scope of its sibling controls in the parent form array.

Here is a step-by-step description of what the function does:

It receives a custom error message as a parameter, with a default message of 'The value must be unique'.
It then accesses the value of the control to which it's applied.
The function assumes that the parent of the control is a form array, and attempts to retrieve it. If the form array or its controls are not available (for instance, if the control is not part of a form array), it returns null, indicating no validation errors.
The function then iterates over each control in the parent form array, excluding the current control.
It creates an array of values for these sibling controls and checks if the array contains a value that matches the value of the current control.
If it finds any matching values, it means that the value of the current control is not unique. The function then returns an error object with the error message.
If no matching values are found, it means that the value of the current control is unique within the form array. The function returns null, indicating no validation errors.

In summary, this function is used to ensure that a value entered into a control in a form array is unique among the values of its sibling controls.

 this.aliases.push(this.fb.control('',[this.ngJoyValidatorsService.unique()]));

upperCase

Will allow user to enter only upperCase.

upperCaseField: ['', this.validationService.upperCase({message:"Value must be in uppercase"})],

url

Check that value entered in the property is in the correct ftp|http|https format or not.

 website: ['', [    
this.validationService.url({message: 'Website must be a valid URL.'})
 ]],

Compare Password

Check whether the value of two formControls are same or not .Below is an example of comparing password but is can used for any controller type

 password: ['', [this.ngJoyValidatorsService.password({    
  validation: {    
  minLength: 5,    
  maxLength: 10,    
  digit: true,    
  specialCharacter: true    
  },message: 'Password must have at least one digit, one special character, and be between 5 and 10 characters in length.'
   }), 
  Validators.required]],
 repeatPass: ['', [this.ngJoyValidatorsService.compare('password'), Validators.required]

Upcoming Form Validations

BIC (Bank Identifier Code) Validator
Phone Number Validator

Goal

To create the best client-side angular reactive validations , supports rapid development of forms with advanced and complex validations, and simplifies the implementation process with concise coding.

Contributing

Cool, you're thinking of helping improve this library? That's awesome! No contribution is too small - from a single character tweak to major code or doc updates. Even if you're not quite ready to write code or docs, you can still chip in by reporting issues or testing patches. Every bit helps!

Need Help

Please ask your questions , https://ngjoy.dev

Feature Request

You can request a new feature by contacting me https://ngjoy.dev

License

MIT

@ngjoy.dev/reactivevalidators

ngJoyValidators - Angular Reactive Custom Validators

🚀 What can ngJoyValidators do?

📚 Demo Project

💾 Installation

Import modules

In your component

Reactive Form Validation

conditionalValidators

conditionalRequiredValidator

coRequiredValidator

ibanValidator

creditCard

sumOfFields

asciiValidator

allFieldsFilled

minMaxArrayLength

creditCard

scriptLanguageType

sanitizeInput

cvv

expiryDate

digitValidator

emailDomain

endsWith

even

extension

factor

file

fileSize

greaterThanEqualTo

greaterThan

noWhitespace

ip

json

latitude

leapYear

latLong

lessThanEqualTo

lessThan

longitude

lowercase

mac

maxDate

maxNumber

minDate

minNumber

numeric

odd

oneOf

password

port

primeNumber

range

startsWith

time

unique

upperCase

url

Compare Password

Upcoming Form Validations

Goal

Contributing

Need Help

Feature Request

License

Readme

Keywords

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