AngularJS ng-model Directive
The ng-model directive binds the value of HTML controls (input, select, textarea) to application data.
* The ng-model Directive
With the ng-model directive, you can bind the value of an input field to a variable created in AngularJS.
Example:
<div ng-app="myapp" ng-controller="myctrl">
Name: <input ng-model="name">
</div>
<script>
var app = angular.module('myapp', []);
app.controller('myctrl', function($scope) {
$scope.name = "Dhaval";
});
</script>
* Two-Way Binding
The binding goes both ways. If the user changes the value inside the input field, the AngularJS property will also change its value:
Example:
<div ng-app="myapp" ng-controller="myctrl">
Name: <input ng-model="name">
<h1>You entered: {{name}}</h1>
</div>
* Validate User Input
The ng-model directive can provide type validation for application data (number, e-mail, required):
Example:
<form ng-app="" name="myForm">
Email:
<input type="email" name="myAddress" ng-model="text">
<span ng-show="myForm.myAddress.$error.email">Not a valid e-mail address</span>
</form>
In the example above, the span will be displayed only if the expression in the ng-show attribute returns true.
* Application Status
The ng-model directive can provide status for application data (valid, dirty, touched, error):
Example:
<form ng-app="" name="myForm" ng-init="myText = 'post@dp.com'">
Email:
<input type="email" name="myAddress" ng-model="myText" required>
<h1>Status</h1>
{{myForm.myAddress.$valid}}
{{myForm.myAddress.$dirty}}
{{myForm.myAddress.$touched}}
</form>
* CSS Classes
The ng-model directive provides CSS classes for HTML elements, depending on their status:
Example:
<style>
input.ng-invalid {
background-color: lightblue;
}
</style>
<body>
<form ng-app="" name="myForm">
Enter your name:
<input name="myName" ng-model="myText" required>
</form>
The ng-model directive adds/removes the following classes, according to the status of the form field:
- ng-empty
- ng-not-empty
- ng-touched
- ng-untouched
- ng-valid
- ng-invalid
- ng-dirty
- ng-pending
- ng-pristine
Note: If the property in the ng-model attribute does not exist, AngularJS will create one for you.
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