Forms in AngularJS provides data-binding and validation of input controls.
Input Controls
Input controls are the HTML input elements:
- input elements
- select elements
- button elements
- textarea elements
Data-Binding
Input controls provides data-binding by using the
ng-model directive.
<input type="text" ng-model="firstname">
The application does now have a property named firstname.
The ng-model directive binds the input controller to the rest of
your application.
The property firstname, can be referred to in a controller:
Example
<script>
var app = angular.module('myApp', []);
app.controller('formCtrl',
function($scope) {
$scope.firstname = "John";
});
</script>
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It can also be referred to elsewhere in the application:
Example
<form>
First Name: <input type="text" ng-model="firstname">
</form>
<h1>You entered: {{firstname}}</h1>
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Checkbox
A checkbox has the value true or false. Apply the
ng-model directive to a checkbox, and use it's value in your
application.
Example
Show the header if the checkbox is checked:
<form>
Check to show a header:
<input type="checkbox" ng-model="myVar">
</form>
<h1 ng-show="myVar">My
Header</h1>
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Radiobuttons
Bind radio buttons to your application with the ng-model
directive.
Radio buttons with the same ng-model can have different values,
but only the selected one will be used.
Example
Display some text, based on the value of the selected radio button:
<form>
Pick a topic:
<input type="radio" ng-model="myVar"
value="dogs">Dogs
<input type="radio" ng-model="myVar" value="tuts">Tutorials
<input type="radio" ng-model="myVar" value="cars">Cars
</form>
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The value of myVar will be either dogs, tuts, or
cars.
Selectbox
Bind select boxes to your application with the ng-model
directive.
The property defined in the ng-model attribute will have the
value of the selected option in the selectbox.
Example
Display some text, based on the value of the selected option:
<form>
Select a topic:
<select ng-model="myVar">
<option value="">
<option value="dogs">Dogs
<option value="tuts">Tutorials
<option
value="cars">Cars
</select>
</form>
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The value of myVar will be either dogs, tuts, or
cars.
An AngularJS Form Example
form = {{user}}
master = {{master}}
Application Code
<div ng-app="myApp" ng-controller="formCtrl">
<form
novalidate>
First Name:<br>
<input type="text" ng-model="user.firstName"><br>
Last
Name:<br>
<input type="text" ng-model="user.lastName">
<br><br>
<button ng-click="reset()">RESET</button>
</form>
<p>form = {{user}}</p>
<p>master = {{master}}</p>
</div>
<script>
var app =
angular.module('myApp', []);
app.controller('formCtrl',
function($scope) {
$scope.master = {firstName: "John", lastName: "Doe"};
$scope.reset = function() {
$scope.user
= angular.copy($scope.master);
};
$scope.reset();
});
</script>
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The novalidate attribute is new in HTML5. It disables any default browser validation.
Example Explained
The ng-app directive defines the AngularJS application.
The ng-controller directive defines the application controller.
The ng-model directive binds two input elements to the user object in the model.
The formCtrl controller sets initial values to the master object, and defines the reset() method.
The reset() method sets the user object equal to the master object.
The ng-click directive invokes the reset() method, only if the button is clicked.
The novalidate attribute is not needed for this application, but normally you will use it in AngularJS forms, to override standard HTML5 validation.