✔ AngularJS ng-model Directive
> binds the value of HTML controls (input, select textarea) to application data.
1. The ng-model Directive
> with 'ng-model' you can bind the value of an input field to a variable created in AngularJS
<div ng-app="myApp" ng-controller="myCtrl">
Name: <input ng-model="name">
</div>
<script>
var app = angular.model('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.name = "John Doe";
});
</script>
2. Two-way Binding
> binding goes both ways. If the user changes the value insdie the input field, the AngularJS property will also change its value
<div ng-app="myApp" ng-controller="myCtrl">
Name: <input ng-model="name">
<h1>You entered: {{name}}</h1>
</div>
3. Validate User Input
> 'ng-model' directive can provide type validation for application data (number, e-mail, required)
<form ng-app="" name="myForm">
Email:
<input type="email" name="myAddress" ng-model="text">
<span ng-show="myForm.myAddress.$error.email">Not a valid e-mail address</span>
</form>: the span will be displayed only if the expression in the 'ng-show' attribute returns true
!! If the property in the 'ng-model' attribute does not exist, AngularJS will create one for you
4. Application Status
> 'ng-model' directive provide status for application data (valid, dirty, touched, error)
<form ng-app="" name="myForm" ng-init="myText = 'post@myweb.com'">
Email: <input type="email" name="myAddress" ng-model="myText" required>
<h1>Status</h1>
{{myForm.myAddress.$valid}}
{{myForm.myAddress.$dirty}}
{{myForm.myAddress.$touched}}
</form>
5. CSS Classes
> 'ng-model' directive provides CSS classes for HTML elements, depending on their status
<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>: '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
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