Validating Angular UI without requiring an input field (validating an expression)

Question

Validating Angular UI without requiring an input field (validating an expression)

Currently, I am utilizing ui-validate utilities available at https://github.com/angular-ui/ui-validate

The issue I am facing involves validating an expression on a form without an input field. To illustrate, consider the following object:

$scope.item = { field1 : 0, field2: 0, field3: 0 };

I aim to receive an error based on the provided expression: field1 + field2 + field3 == 0

This validation pertains to the entire form, not just specific inputs.

javascript angularjs validation ui-validate

Answer 1

Answer №1

To implement validation function, consider the following example using ui-validate:

$scope.checkValidation = function () {
    var total = 0;

    // Calculate sum excluding Angular keys
    angular.forEach($scope.dataItems, function (val, k) {
        // Add a condition "angular.isNumber(val)" for text fields if required
        if (k.charAt(0) !== '$') {
            // Convert to integer using "parseInt()" method if values are strings
            total += val;
        }
    });

    return total !== 0;
}

Add the validation display in your form:

<form>
    <div ng-show="!checkValidation()">Error Detected. Total cannot be zero</div>
    <!-- Include your input fields here -->
</form>

Answer 2

To implement validation function, consider the following example using ui-validate:

$scope.checkValidation = function () {
    var total = 0;

    // Calculate sum excluding Angular keys
    angular.forEach($scope.dataItems, function (val, k) {
        // Add a condition "angular.isNumber(val)" for text fields if required
        if (k.charAt(0) !== '$') {
            // Convert to integer using "parseInt()" method if values are strings
            total += val;
        }
    });

    return total !== 0;
}

Add the validation display in your form:

<form>
    <div ng-show="!checkValidation()">Error Detected. Total cannot be zero</div>
    <!-- Include your input fields here -->
</form>

Answer 3

Answer №2

The use of ui-validate is restricted to input tags within the requirement of ng-model. Alternatively, binding ng-show to a function would serve the same purpose. For instance, refer to this demonstration: http://example.com/code123

angular.module('validationApp', ['ngMessages'])
  .controller('formController', FormCtrl);

function FormCtrl() {
  vm = this;  
  vm.data = { value1 : 0, value2: 0, value3: 0 };
  vm.checkValidity = validateFunction;
    
    function validateFunction() {
      // Check if the form data is valid.
      return (vm.data.value1 + vm.data.value2 + vm.data.value3 == 0);
    };
}

<div ng-app='validationApp' ng-controller="formController as vm">
  <form name="sampleForm">
    <label for="value1">Value 1</label>
   <input type="number" name="value1" ng-model="vm.data.value1"/>
    <label for="value2">Value 2</label>
    <input type="number" name="value2" ng-model="vm.data.value2"/>
    <label for="value3">Value 3</label>
    <input type="number" name="value3" ng-model="vm.data.value3"/>
    <div ng-show="vm.checkValidity()">
  <div class="error">Invalid form entry.</div>
</div>
    <button>Submit</button>
    </form>
</div>

Answer 4

The use of ui-validate is restricted to input tags within the requirement of ng-model. Alternatively, binding ng-show to a function would serve the same purpose. For instance, refer to this demonstration: http://example.com/code123

angular.module('validationApp', ['ngMessages'])
  .controller('formController', FormCtrl);

function FormCtrl() {
  vm = this;  
  vm.data = { value1 : 0, value2: 0, value3: 0 };
  vm.checkValidity = validateFunction;
    
    function validateFunction() {
      // Check if the form data is valid.
      return (vm.data.value1 + vm.data.value2 + vm.data.value3 == 0);
    };
}

<div ng-app='validationApp' ng-controller="formController as vm">
  <form name="sampleForm">
    <label for="value1">Value 1</label>
   <input type="number" name="value1" ng-model="vm.data.value1"/>
    <label for="value2">Value 2</label>
    <input type="number" name="value2" ng-model="vm.data.value2"/>
    <label for="value3">Value 3</label>
    <input type="number" name="value3" ng-model="vm.data.value3"/>
    <div ng-show="vm.checkValidity()">
  <div class="error">Invalid form entry.</div>
</div>
    <button>Submit</button>
    </form>
</div>

Validating Angular UI without requiring an input field (validating an expression)

Answer №1

Answer №2

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