Angular validation does not work

Angular validation does not work

By : user2953470
Date : November 21 2020, 01:01 AM
this one helps. I'm following a tutorial on AngularJS, now I'm stuck, I don't know what I'm doing wrong. , You need add attribute required to input tag
code :
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app>
        <form name="mijnFormulier" novalidate>
                <td><input value="" ng-model="user.naam" name="naam" required />
                <td><span style="color: red" ng-show="mijnFormulier.naam.$dirty && mijnFormulier.naam.$invalid" ><span ng-show="mijnFormulier.naam.$error.required">Moet ingevuld worden</span></span></td>

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Getting angular form validation to work without using ngSubmit

Getting angular form validation to work without using ngSubmit

By : bibhabchakraborty
Date : March 29 2020, 07:55 AM
Hope this helps It's not really clear whether you want to rely on HTML5 validation or on AngularJS validation. If it's the Angular validation that you want to use than you may simply use FormController to trigger the validation and error messages:
code :
<div ng-controller="MainCtrl">
  <form name="form" press-enter="add_entry()" novalidate>
    <input type="text" name="amount" ng-model="amount" required />
    <span ng-show="submitted && form.amount.$error.required">Amount is required</span>
function MainCtrl($scope) {
    $scope.add_entry = function() {
        $scope.submitted = true;
            console.log("Entry added");
Angular JS form validation does not seem to work

Angular JS form validation does not seem to work

By : chicopepino
Date : March 29 2020, 07:55 AM
I wish this help you In order for Angular to track changes on form inputs, they need to be defined as ng-model properties on the scope.
So, your demo will work if you add the appropriate ng-model attributes:
code :
<body data-ng-app="testapp">
<div data-ng-controller="testCtrl">
     <h1>Test {{name}}!!</h1>

    <form name="loginForm" action="login" novalidate>
        <input type="email" name="email" ng-model="email" placeholder="email" required/>
        <input type="password" name="password" ng-model="passowrd" placeholder="password" required/>
        <button type="submit" ng-disabled="loginForm.$invalid">Login</button>
        <p ng-show="loginForm.$invalid">Please fix your form.</p>
        <p ng-show="loginForm.email.$invalid">Please fix your email.</p>
        <p ng-show="loginForm.password.$invalid">Please fix your password.</p>
    var testapp = angular.module('testapp', []);
    var testCtrl = function($scope) {
        $scope.name = 'validation';
Angular directive for percentage input and validation (initial validation doesn't work)

Angular directive for percentage input and validation (initial validation doesn't work)

Date : March 29 2020, 07:55 AM
this will help Found a solution, but please feel free to suggest better ways, as I feel this is a work-around and doesn't look very elegant. If not, hope this helps someone else.
This part did the trick:
code :
var modelGetter = $parse(attrs.ngModel);
var initialValue = modelGetter(scope);
validatePercentage($filter('percentage')(initialValue, allowFraction ? 2 : 0));
    export function PercentageInputFormatter($parse, $filter) {
    return {
        restrict: 'A',
        require: 'ngModel',
        link: function (scope, element, attrs, vm) {
            if (vm) {

                var minNumber: number = 'min' in attrs ? parseFloat(attrs.min) : Number.MIN_VALUE;
                var maxNumber: number= 'max' in attrs ? parseFloat(attrs.max) : Number.MAX_VALUE;
                var allowFraction: boolean = 'fraction' in attrs ? attrs.fraction === 'true' : false;

                var modelGetter = $parse(attrs.ngModel);
                var initialValue = modelGetter(scope);
                validatePercentage($filter('percentage')(initialValue, allowFraction ? 2 : 0));

                vm.$parsers.push(function (value) {
                    return validatePercentage(value);

                vm.$formatters.push(function (value) {
                    return $filter('percentage')(value, allowFraction ? 2 : 0);

                function validatePercentage(value) {
                    if (value) {
                        var valid = !isNaN(parseFloat(value)) && isFinite(value) && parseFloat(value) >= minNumber && parseFloat(value) <= maxNumber;
                        if (!allowFraction)
                            valid = valid && value.indexOf('.') == -1;

                        vm.$setValidity('percentage', valid);

                    return valid ? value / 100 : undefined;
Unable to get angular 2 form validation to work

Unable to get angular 2 form validation to work

By : thayalan p
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , What is the state of active variable? It must be true because you have used the ngIf:
code :
<form *ngIf="active" (ngSubmit)="onSubmit()" #heroForm="ngForm">
Why Angular pattern validation does not work?

Why Angular pattern validation does not work?

By : user3219540
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Since you're passing a string to form a regex (not a regex itself), you need to double escape it.
code :
latitude: [null, [Validators.pattern("^\\d+\\.\\d+$")]],
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