Validating Forms in AngularJS: Ensuring At Least One Input Field is Not Empty

Consider the following basic HTML form:

<form name="myForm" action="#sent" method="post" ng-app>
   <input name="userPreference1" type="text" ng-model="shipment.userPreference" />
   <input name="userPreference2" type="text" ng-model="shipment.userPreference" />
   <input name="userPreference3" type="text" ng-model="shipment.userPreference" />
... submit input and other code...
</form>

I require guidance on how to validate if at least one of the inputs is empty during validation. The validation rule states that the user must fill in at least one preference.

The jQuery method below achieves this:

if ( $("input").val() == "" ) {

However, I am interested in implementing a similar functionality using AngularJS.

Thank you for your assistance,

Guillermo

javascripthtmlvalidationangularjs

Answer №1

To prevent the form submission when all inputs are blank, you can simply disable the submit button using the following code snippet:

<form name="myForm" action="#send" method="post" ng-app>
   <input name="userPreference1" type="text" ng-model="shipment.userPreference1" />
   <input name="userPreference2" type="text" ng-model="shipment.userPreference2" />
   <input name="userPreference3" type="text" ng-model="shipment.userPreference3" />

   <button type="submit" ng-disabled="!(!!shipment.userPreference1 || !!shipment.userPreference2  || !!shipment.userPreference3)">Submit</button>
</form>

The !!str syntax is used to convert a string value to a boolean. Both !!null and !!"" evaluate to false.

Check out the demo

Answer №2

To ensure users provide certain information, use the "required" attribute in input fields and customize the handling using $valid with AngularJS forms. For more details, visit this link

Answer №3

After some consideration, I came up with the following solution:

        $scope.requiredInputsGroup = function () {
            var isRequired = true;
            if (!$scope.shipment) {
                return true;
            }
            angular.forEach(["userPreference1", "userPreference2", "userPreference3"], function (input) {
                if ($scope.shipment[input]) {
                    isRequired = false;
                    return false;
                }
            });

            return isRequired;
        };

This method should be applied to a data-ng-required in each of the input fields...

<form name="myForm" action="#sent" method="post" ng-app>
   <input name="userPreference1" type="text" ng-model="shipment.userPreference1" ng-required="requiredInputsGroup()" />
   <input name="userPreference2" type="text" ng-model="shipment.userPreference2" ng-required="requiredInputsGroup()" />
   <input name="userPreference3" type="text" ng-model="shipment.userPreference3" ng-required="requiredInputsGroup()" />

   <button type="submit" ng-disabled="myForm.$invalid">Submit</button>
</form>

Lastly, I disabled the submit button by using myForm.$invalid.

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