validation-builder-js

A Javascript Universal Module to build reusable validation patterns.

This module is fully functional but it is more like a proof of concept due to the lack of validators.

However, you can implement your own validators or plug validators from other libraries in as described later.

This module depends on underscorejs.

Installation

You may want to install validation-builder-js using npm or bower.

npm install validation-builder-js --save

bower install validation-builder-js --save

Basic usage

This module is suitable for use in Node.js and browser environments.

It has been tested for use in Node.js.

It has not been tested on any browser yet.

Node

var
    ValidationBuilder = require('validation-builder-js');
 
var
    validation = ValidationBuilder
        .forge() // creates a new instance of ValidationBuilder
        .isNull()
        .isUndefined()
        .build() // creates a new instance of Validation
 
    result = validation.run(null); // argument to run() is the subject of validation
 
console.log(result.forAll()); // false
console.log(result.forAny()); // true
console.log(result.forOne('isNull')); // true

Browser

<script src="underscore-min.js"></script>
<script src="ValidationBuilder.min.js"></script>
<script>
    var
        validation = ValidationBuilder
            .forge()
            .isNull()
            .isUndefined()
            .build(),
        result = validation.run(null); // argument to run() is the subject of validation
 
    console.log(result.forAll()); // false
    console.log(result.forAny()); // true
    console.log(result.forOne('isNull')); // true
</script> 

Built-in validators

• containsAll(compareArray)
• containsAny(compareArray)

containsAll

var
    subjectArray = [ 'a', 'b', 'c' ],
    compareArray = [ 'a' ],
    validation = ValidationBuilder
        .forge()
        .containsAll(compareArray),
    result = validation.run(subjectArray); // does subjectArray contain all elements in compareArray?
 
console.log(result.forAll()); // true

containsAny

var
    subjectArray = [ 'a', 'b', 'c' ],
    compareArray = [ 'a' ],
    validation = ValidationBuilder
        .forge()
        .containsAny(compareArray),
    result = validation.run(subjectArray); // does subjectArray contain any of the elements in compareArray?
 
console.log(result.forAll()); // true

Proxied validators

ValidationBuilder proxies to Underscore.js to provide 16 validators.

• isArguments
• isArray
• isBoolean
• isDate
• isElement
• isEmpty
• isEqual
• isFinite
• isFunction
• isNaN
• isNull
• isNumber
• isObject
• isRegExp
• isString
• isUndefined

Custom validators

You can implement your own validator and register it to ValidationBuilder as follows:

ValidationBuilder.register('isNull', function (subject) {
    return subject === null;
});

Custom validator will be available to any new instance of ValidationBuilder.

Your validator should meet following requirements

• accept subject of validation as first argument;
• validate any argument;
• only return a boolean value;
• not to throw any error.

Plug validators from other libraries in

ValidationBuilder.register('isNumber', _.isNumber);
 
var
    v = ValidationBuilder
        .forge()
        .isNumber()
        .build();
 
console.log(v.run(10).forAll()); // true