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.
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>
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>
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