Validating date inputs with ng-change in AngularJS

Question

Validating date inputs with ng-change in AngularJS

I am currently utilizing AngularJS along with AngularJS bootstrap within my webpage. One of the components I have is a date picker directive that is structured like this:

    <div class="form-group {{dateStatus.class}}">
        <p class="input-group">
            <input type="text" id="inpDate" class="form-control" 
                   datepicker-popup="dd-MMMM-yyyy" ng-model="task.date" 
                   is-open="datePickerStatus.isOpen" min-date="minDate" 
                   datepicker-options="dateOptions" ng-required="true" 
                   close-text="Close" placeholder="Due date" 
                   ng-change="checkDateValidity()"
            />
            <span class="input-group-btn">
                <button type="button" class="btn btn-default" 
                        ng-click="openDatePicker($event)"
                >
                    <i class="glyphicon glyphicon-calendar"></i>
                </button>
            </span>
        </p>
    </div>

In order to validate the date input, I have implemented the following function in my controller:

        $scope.checkDateValidity = function(){
        var date,
            isValid,
            taskDate;
        taskDate = $scope.task.date;
        date = new Date(taskDate);
        isValid = !isNaN(date);
        if(isValid) {
            $scope.addButtonState.isOk = true;
            $scope.dateStatus.class = '';
        }
        else{
            $scope.addButtonState.isOk = false;
            $scope.dateStatus.class = 'has-error';
        }
    }

Currently, everything is functioning correctly in validating the entered date, however, I encountered an issue where when the date input is left empty (or changed from valid to blank), I want it to be considered acceptable as well. Due to both empty and invalid dates resulting in undefined, I am unsure how to differentiate between them.

I also contemplated directly reading the input text using this approach:

document.getElementById('inpDate').value

However, the ng-change event is triggered only when the value is altered, leaving me with the previous value which is now irrelevant...

Thank you for your time and any assistance provided.

javascript angularjs datepicker angular-ui-bootstrap angularjs-ng-change

Answer 1

Answer №1

One effective method for validation involves implementing a directive to include a Validation Rule.

.directive("validateDate", function() {
     return {
         require: 'ngModel',
         link: function(scope, elm, attrs, ctrl) {
             ctrl.$validators.validateDate = function(modelValue, viewValue) {
                 if(!isNaN(modelValue) || ctrl.$isEmpty(modelValue)){
                     return true;
                 }
                 return false;
             };
         }
     };
 })

Simply include validate-date in the input tag and the validation will indicate that the input is valid if it is not a number or empty.

Answer 2

One effective method for validation involves implementing a directive to include a Validation Rule.

.directive("validateDate", function() {
     return {
         require: 'ngModel',
         link: function(scope, elm, attrs, ctrl) {
             ctrl.$validators.validateDate = function(modelValue, viewValue) {
                 if(!isNaN(modelValue) || ctrl.$isEmpty(modelValue)){
                     return true;
                 }
                 return false;
             };
         }
     };
 })

Simply include validate-date in the input tag and the validation will indicate that the input is valid if it is not a number or empty.

Answer 3

Answer №2

To ensure the validation of the value in #inpDate, you can bind a validator callback to both the change and keyup events. When the callback is triggered, you can then verify the validity of the input.

$timeout(function(){        
    angular
        .element(document.getElementById('inpDate'))
        .bind('keyup change', function(){
            var inputValue,
                customDate,
                isValid;

            inputValue = this.value;
            if(inputValue != ''){
                customDate = new Date(inputValue);
                isValid = !isNaN(customDate);

                if(isValid){
                    console.log('Valid');
                    // do something
                }
                else{
                    console.log('Invalid');
                    // do something else
                }
            }
            else{
                console.log('Empty');
                // do something else
            }
        });
}, 400);

Ensure that you have injected $timeout in your controller.

Answer 4

To ensure the validation of the value in #inpDate, you can bind a validator callback to both the change and keyup events. When the callback is triggered, you can then verify the validity of the input.

$timeout(function(){        
    angular
        .element(document.getElementById('inpDate'))
        .bind('keyup change', function(){
            var inputValue,
                customDate,
                isValid;

            inputValue = this.value;
            if(inputValue != ''){
                customDate = new Date(inputValue);
                isValid = !isNaN(customDate);

                if(isValid){
                    console.log('Valid');
                    // do something
                }
                else{
                    console.log('Invalid');
                    // do something else
                }
            }
            else{
                console.log('Empty');
                // do something else
            }
        });
}, 400);

Ensure that you have injected $timeout in your controller.

Answer 5

Answer №3

To perform validation in this manner, you may utilize the following code snippet:

if(document.getElementById('inpDate').value === "" ){
            $scope.addButtonState.isOk = true;
            $scope.dateStatus.class = '';
}

Insert this block of code at the start of the $scope.checkDateValidity function.

Answer 6

To perform validation in this manner, you may utilize the following code snippet:

if(document.getElementById('inpDate').value === "" ){
            $scope.addButtonState.isOk = true;
            $scope.dateStatus.class = '';
}

Insert this block of code at the start of the $scope.checkDateValidity function.

Validating date inputs with ng-change in AngularJS

Answer №1

Answer №2

Answer №3

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