Adding requiredExpression. Fixes #66

Author: Kent C. Dodds

CHANGELOG.md

@@ -1,4 +1,9 @@
 Version numbers correspond to `bower.json` version
+# Latest
+
+- Now providing the `result` to each field template authors have the power to associate other values of the result set with the template
+- Adding `requiredExpression` to field options and assinging the field's `required` property based on its evaluation. Works very much like `hideExpression`
+
 # 0.0.14
 
 Botched a publish with npm, so 0.0.13 became 0.0.14, just needed to update the changelog.

README.md

@@ -158,6 +158,13 @@ When constructing fields use the options below to customize each field object. Y
 ###### Default
 >`undefined`
 
+---
+##### requiredExpression (expression string)
+>`requiredExpression` is used to conditionally require the input. Evaluates on the `result` and uses the `required` property on the field.
+
+###### Default
+>`undefined`
+
 ---
 ##### hideExpression (expression string)
 >`hideExpression` is used to conditionally show the input. Evaluates on the `result` and uses the `hide` property on the field.

src/directives/formly-form.js

@@ -53,6 +53,9 @@ angular.module('formly.render')
 					if (field.hideExpression) {
 						field.hide = $parse(field.hideExpression)($scope.result);
 					}
+					if (field.requiredExpression) {
+						field.required = $parse(field.requiredExpression)($scope.result);
+					}
 				});
 			}, true);
 		}

src/views/home.js

@@ -61,10 +61,16 @@ app.controller('home', function($scope, $parse, formlyOptions, $window, usingCus
 		label: 'Last Name',
 		placeholder: 'Doe'
 	}, {
+		key: 'emailRequired',
+		type: 'checkbox',
+		label: 'Email required',
+		description: 'Do you really want us to have your email?'
+	}, {	
 		key: 'email',
 		type: 'email',
 		placeholder: '[email protected]',
-		description: 'We won\'t spam you'
+		description: 'We won\'t spam you',
+		requiredExpression: 'emailRequired'
 	}, {
 		key: 'about',
 		type: 'textarea',