Mrthdrb

I am using the following code on a form to use the validation.js library to validate the form. One of the validation files uses ./rules.js to extend the rules used within the validator which I have managed to overwrite. However "validation": is not the file that uses it. Can some body please show me?

I have not set a requirejs config in the module that I am doing this from.

I want to add a basic rule that comes back true or false every time just to start from somewhere.

data-mage-init='"validation": 

It's hard to answer your question without creating an example. So I suppose that you need to add your custom validation rule into your custom payment method in Magento 2.

Then, your method render js will look like this:

/**
 * Copyright © 2017 StackOverflow. All rights reserved.
 * See COPYING.txt for license details.
 */
/*browser:true*/
/*global define*/
define(
 [
 'jquery',
 'ko',
 'Magento_Checkout/js/view/payment/default',
 'mage/validation'
 ],
 function ($, ko, Component) 
 'use strict';

 $.validator.addMethod('validate-input-one', function (value) 
 return (value === $('#hidden-input-one').val());
 , 'You have to select input 1 before place order.');

 $.validator.addMethod('validate-input-two', function (value) 
 return (value === $('#hidden-input-two').val());
 , 'You have to select input 2 before place order.');

 return Component.extend(

 ...

 /**
 * Custompayment form validation
 *
 * @returns Boolean
 */
 validate: function () 
 var form = 'form[data-role=custompayment-form]';
 return $(form).validation() && $(form).validation('isValid');
 ,

 ...

 );
 
);

Now, in your custom payment method template file:

<input type="text"
 id="input-one"
 name="payment[input-one]"
 data-validate="required:true, 'validate-input-one': true"
 aria-haspopup="false"
 aria-autocomplete="both"
 autocomplete="off"
 class="input-text"/>
<input type="hidden" id="hidden-input-one" data-bind="value: inputOne" />

As you see, whenever the value attribute of #hidden-input-one is empty, #input-one will not pass the validation.

CONCLUSION

mage/validation is the key.