AngularJS Sample Application
AngularJS enriches form filling and validation. We can use ng-click to handle AngularJS click on button and use $dirty and $invalid flags to do the validations in seemless way. Use novalidate with a form declaration to disable any browser specific validation. Forms controls makes heavy use of Angular events. Let's have a quick look on events first.Events
AngularJS provides multiple events which can be associated with the HTML controls. For example ng-click is normally associated with button. Following are supported events in Angular JS.
ng-click
ng-dbl-click
ng-mousedown
ng-mouseup
ng-mouseenter
ng-mouseleave
ng-mousemove
ng-mouseover
ng-keydown
ng-keyup
ng-keypress
ng-change
ng-click
Reset data of a form using on-click directive of a button.
<input name = "firstname" type = "text" ng-model = "firstName" required>
<input name = "lastname" type = "text" ng-model = "lastName" required>
<input name = "email" type = "email" ng-model = "email" required>
<button ng-click = "reset()">Reset</button>
<script>
function studentController($scope) {
$scope.reset = function(){
$scope.firstName = "Mahesh";
$scope.lastName = "Parashar";
$scope.email = "MaheshParashar@tutorialspoint.com";
}
$scope.reset();
}
</script>
Validate data
Following can be used to track error.
$dirty − states that value has been changed.
$invalid − states that value entered is invalid.
$error − states the exact error.
Example
Following example will showcase all the above mentioned directives.
testAngularJS.htm
<html>
<head>
<title>Angular JS Forms</title>
<script src = "http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
<style>
table, th , td {
border: 1px solid grey;
border-collapse: collapse;
padding: 5px;
}
table tr:nth-child(odd) {
background-color: #f2f2f2;
}
table tr:nth-child(even) {
background-color: #ffffff;
}
</style>
</head>
<body>
<h2>AngularJS Sample Application</h2>
<div ng-app = "mainApp" ng-controller = "studentController">
<form name = "studentForm" novalidate>
<table border = "0">
<tr>
<td>Enter first name:</td>
<td><input name = "firstname" type = "text" ng-model = "firstName" required>
<span style = "color:red" ng-show = "studentForm.firstname.$dirty && studentForm.firstname.$invalid">
<span ng-show = "studentForm.firstname.$error.required">First Name is required.</span>
</span>
</td>
</tr>
<tr>
<td>Enter last name: </td>
<td><input name = "lastname" type = "text" ng-model = "lastName" required>
<span style = "color:red" ng-show = "studentForm.lastname.$dirty && studentForm.lastname.$invalid">
<span ng-show = "studentForm.lastname.$error.required">Last Name is required.</span>
</span>
</td>
</tr>
<tr>
<td>Email: </td><td><input name = "email" type = "email" ng-model = "email" length = "100" required>
<span style = "color:red" ng-show = "studentForm.email.$dirty && studentForm.email.$invalid">
<span ng-show = "studentForm.email.$error.required">Email is required.</span>
<span ng-show = "studentForm.email.$error.email">Invalid email address.</span>
</span>
</td>
</tr>
<tr>
<td>
<button ng-click = "reset()">Reset</button>
</td>
<td>
<button ng-disabled = "studentForm.firstname.$dirty &&
studentForm.firstname.$invalid || studentForm.lastname.$dirty &&
studentForm.lastname.$invalid || studentForm.email.$dirty &&
studentForm.email.$invalid" ng-click="submit()">Submit</button>
</td>
</tr>
</table>
</form>
</div>
<script>
var mainApp = angular.module("mainApp", []);
mainApp.controller('studentController', function($scope) {
$scope.reset = function(){
$scope.firstName = "Mahesh";
$scope.lastName = "Parashar";
$scope.email = "MaheshParashar@tutorialspoint.com";
}
$scope.reset();
});
</script>
</body>
</html>
Output
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