Frontend rules

uafrica/Customshipping/view/frontend/web/js/model/shipping-rates-validation-rules.js

+/**
+ * Copyright © 2015 Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+/*global define*/
+define(
+    [],
+    function () {
+        "use strict";
+        return {
+            getRules: function() {
+                return {
+
+                };
+            }
+        };
+    }
+);
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uafrica/Customshipping/view/frontend/web/js/model/shipping-rates-validator.js

+/**
+ * Copyright © 2015 Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+/*global define*/
+define(
+    [
+        'jquery',
+        'mageUtils',
+        './shipping-rates-validation-rules',
+        'mage/translate'
+    ],
+    function ($, utils, validationRules, $t) {
+        "use strict";
+        return {
+            validationErrors: [],
+            validate: function(address) {
+                var self = this;
+                this.validationErrors = [];
+                $.each(validationRules.getRules(), function(field, rule) {
+                    if (rule.required && utils.isEmpty(address[field])) {
+                        var message = $t('Field ') + field + $t(' is required.');
+                        self.validationErrors.push(message);
+                    }
+                });
+                return !Boolean(this.validationErrors.length);
+            }
+        };
+    }
+);
\ No newline at end of file

uafrica/Customshipping/view/frontend/web/js/view/shipping-rates-validation.js

+/**
+ * Copyright © 2015 Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+/*browser:true*/
+/*global define*/
+define(
+    [
+        'uiComponent',
+        'Magento_Checkout/js/model/shipping-rates-validator',
+        'Magento_Checkout/js/model/shipping-rates-validation-rules',
+        '../model/shipping-rates-validator',
+        '../model/shipping-rates-validation-rules'
+    ],
+    function (
+        Component,
+        defaultShippingRatesValidator,
+        defaultShippingRatesValidationRules,
+        sampleShippingProviderShippingRatesValidator,
+        sampleShippingProviderShippingRatesValidationRules
+    ) {
+        "use strict";
+        defaultShippingRatesValidator.registerValidator('uafrica', sampleShippingProviderShippingRatesValidator);
+        defaultShippingRatesValidationRules.registerRules('uafrica', sampleShippingProviderShippingRatesValidationRules);
+        return Component;
+    }
+);