Tuesday, 27 October 2015

A Form Validation Example in AngularJS - Show Error Style After Submitted

Below is a basic example of a form validation in AngularJS that shows error style after the form is submitted.

To do this, we need to use novalidate attribute on the form to avoid browser validating the form but is passed to JavaScript to perform manual validation. In addition, we can utilise ng-submitted class that is added to the form by AngularJS after it is submitted.

The view:
<body ng-app="validationExample">
    <div ng-controller="MyCtrl as vm">
      <form name="myForm" novalidate ng-submit="vm.submitted(myForm, vm.input)">
        <input type="text" name="name" ng-model="vm.input.name" placeholder="please enter text" required/>
        <span ng-show="myForm.name.$error.required == true">*</span>
        <input type='text' name="value" ng-model='vm.input.value' placeholder="a number greater than 0" required ng-pattern='/^([1-9][0-9]*(\.[0-9]+)?|0+\.[0-9]*[1-9][0-9]*)$/'>
        <span ng-show="myForm.value.$error.required == true">*</span>

The script:
var myApp = angular.module('validationExample', [])

myApp.controller('MyCtrl', [function () {
    var vm = this;
    vm.submitted = function(form, input) {
      if(form.$valid) {
} ]);

The stylesheet:
.ng-submitted input.ng-invalid {

See the example in Plunker.

To read more about form validation, please see my previous post.

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