Ensuring that an md-radio-group is a required field in Angular Material

Currently, I am working on a project using Angular Material where I need to enforce a required radio group. This means that the user must select a radio button before being able to submit the form. The form should be considered invalid if no radio button is selected.

Below is the code snippet:

<form id="pipelineForm" name="pipelineForm" ng-submit="processForm()" flex layout="column" novalidate>
    <md-radio-group ng-model="parameters.selected" ng-required="true" name="analyzerRG" 
        <md-radio-button ng-value="choiceObj" ng-repeat="choiceObj in parameters.choices" ng-required>
            {{choiceObj.text}}
        </md-radio-button>
    </md-radio-group>
</form>

I have attempted various methods such as making individual <md-radio-button> required, assigning a name to the radio group, and using ng-messages for the required validation, but without success. Even when inspecting the md-radio-group in Chrome DevTools, it always shows as 

class="ng-valid ng-valid-required"
.

While I could manually check the parameters.selected property to validate the form, I would prefer if the correct classes were applied to the md-radio-group so that the form is automatically marked as invalid.

P.S.: I noticed a similar issue on the Angular Material Github page, but it appears to be closed now and the suggested solutions do not work for my scenario.

javascriptangularjsangular-material

Answer №1

For the solution, please refer to the CodePen link provided in the discussion thread: (https://codepen.io/jakobadam/pen/xqZoBR)

Additional information can be found at: https://github.com/angular/material/issues/1305#issuecomment-350047026

<md-input-container class="md-input-has-value" 
       ng-class="{ 'md-input-invalid' : form.fruit.$invalid && form.$submitted }">
  <label class="md-required" translate>Fruit</label>

  <md-radio-group md-autofocus name="fruit" ng-model="fruit" layout="row" required>
    <md-radio-button value="Apple" class="md-primary">Apple</md-radio-button>
    <md-radio-button value="Banana"> Banana </md-radio-button>
    <md-radio-button value="Mango">Mango</md-radio-button>  
  </md-radio-group>

  <div ng-messages="form.fruit.$error">
    <div ng-message="required" translate>Yo. Select some fruit.</div>
  </div>
</md-input-container>

Answer №2

It seems that the issue with ng-messages not displaying is due to its lack of awareness regarding custom controls like md-radio-group/md-radio-button. To address this, a revised method involves using an obscured text field linked to the same model value, allowing the messages to show up as expected.

In addition, the novalidate attribute has been included in the form element to prevent the default browser form validation. Instead of disabling the submit button and hindering message display, the ng-submit expression now verifies myForm.$valid before triggering the submit method.

<html lang="en">

<head>
    <link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-animate.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-aria.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-messages.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.js"></script>
    <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
    <script language="javascript">
        angular
            .module('firstApplication', ['ngAnimate', 'ngAria', 'ngMaterial', 'ngMessages'])
            .controller('myController', function($scope) {
                $scope.statuses = ['Planned', 'Confirmed', 'Cancelled'];
                $scope.options = ['Option 1', 'Option 2', 'Option 3', 'Option 4', '...'];
                $scope.submit = function(obj) {
                    // submit code goes here
                    console.log(obj);
                };
                $scope.reset = function() {
                    $scope.obj = {
                        status: ""
                    }
                }
                $scope.reset();
            });
    </script>
</head>

<body ng-app="firstApplication">

    <form name="myForm" ng-app="myApp" ng-controller="myController" class="container-fluid" ng-submit="myForm.$valid && submit(obj)" novalidate>
        <div class="row">
            <div class="col-xs-8">
                <md-input-container>
                    <md-radio-group id="status" ng-model="obj.status" class="">
                        <md-radio-button ng-repeat="s in statuses" ng-value="s">{{s}}</md-radio-button>
                    </md-radio-group>
                    <input type="text" ng-model="obj.status" name="status" style="max-height:0; opacity: 0; border: none" ng-required="true" aria-label="Status">
                    <div ng-messages="myForm.status.$error" role="alert">
                        <div ng-message="required">Status is required.</div>
                    </div>
                </md-input-container>
            </div>
        </div>
        <md-button type="button" ng-click="reset()">RESET</md-button>
        <md-button class="md-primary" type="submit">SUBMIT</md-button>
    </form>
</body>

</html>

Answer №3

If you're using ng-disabled with Angular Material and it's not working, try removing the 'novalidate' attribute from your form tag.

Here is a snippet of code that demonstrates this issue:

<html lang="en">

<head>
    <link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-animate.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-aria.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-messages.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.js"></script>
    <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
    <script language="javascript">
        angular
            .module('firstApplication', ['ngAnimate', 'ngAria', 'ngMaterial', 'ngMessages'])
            .controller('myController', function($scope) {
                $scope.statuses = ['Planned', 'Confirmed', 'Cancelled'];
                $scope.options = ['Option 1', 'Option 2', 'Option 3', 'Option 4', '...'];
                $scope.submit = function(obj) {
                    // submit code goes here
                    console.log(obj);
                };
                $scope.reset = function() {
                    $scope.obj = {
                        name: "",
                        myselect: "",
                        status: ""
                    }
                }
                $scope.reset();
            });
    </script>
</head>

<body ng-app="firstApplication">

    <form name="myForm" ng-app="myApp" ng-controller="myController" class="container-fluid" ng-submit="submit(obj)">
        <div class="row">
            <div class="col-xs-8">
                <md-input-container>
                    <label>Name</label>
                    <input name="name" id="name" ng-model="obj.name" ng-required="true">
                    <div ng-messages="myForm.name.$error">
                        <div ng-message="required">Campaign Name is required.</div>
                    </div>
                </md-input-container>
            </div>
            <div class="col-xs-8">
                <md-input-container>
                    <md-select name="myselect" id="myselect" placeholder="myselect" ng-model="obj.myselect" ng-required="true">
                        <md-option ng-repeat="o in options" ng-value="o">{{o}}</md-option>
                    </md-select>
                    <div ng-messages="myForm.myselect.$error">
                        <div ng-message="required">myselect is required.</div>
                    </div>
                </md-input-container>
            </div>
            <div class="col-xs-8">
                <md-input-container>
                    <md-radio-group name="status" id="status" ng-model="obj.status" ng-required="true" class="">
                        <md-radio-button ng-repeat="s in statuses" ng-value="s">{{s}}</md-radio-button>
                    </md-radio-group>
                    <div ng-messages="myForm.status.$error">
                        <div ng-message="required">myselect is required.</div>
                    </div>
                </md-input-container>
            </div>
        </div>
        <md-button type="button" ng-click="reset()">RESET</md-button>
        <md-button class="md-primary" type="submit" ng-disabled="myForm.$invalid">SUBMIT</md-button>
    </form>
</body>

</html>

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