Python AngularJS and Hacking Programming Mastery - A Code Like A Pro Guide by Bates Jonathan
Author:Bates , Jonathan [Bates , Jonathan]
Language: eng
Format: epub
Published: 2018-09-17T16:00:00+00:00
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Events
Events directives signal the application to respond to changes in the environment. Some of the changes may be user initiated, others may be automated program functions. The following directives can be placed in your HTML to listen for events that your application can respond to.
ng-blur
ng-change
ng-click
ng-copy
ng-cut
ng-dblclick
ng-focus
ng-keydown
ng-keypress
ng-keyup
ng-mousedown
ng-mouseenter
ng-mouseleave
ng-mousemove
ng-mouseover
ng-mouseup
ng-paste
The event directives enable you to call AngularJS functions at specific user events.
If you have both an AngularJS event and an HTML event, both events will take place.
Mouse Events
A Mouse event happens when the user’ moves curser over an HTML element:
ng-mouseenter
ng-mousemove
ng-mouseleave
ng-mouseover
ng-mouseup
Or when the button is clicked on an element:
ng-mousedown
ng-click
Mouse events can be added to any element on the web page. We will examine the ng-click directive.
______________________________________________________________________________
Example (Mouse Event)___________________________________________________________
<!DOCTYPE html>
<html>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body>
<div ng-controller="exampleCtrl ng-app="exampleApp" ">
<button ng-click="count = count + 1">Click Me!</button>
<p>{{ count }}</p>
</div>
<script>
var app = angular.module('exampleApp', []);
app.controller('exampleCtrl', function($scope) {
$scope.count = 0;
});
</script>
</body>
</html>
Output
Although not rendered here, in your web browser, you will see a button. Upon clicking the button, the number below it will increase by 1incrementally.
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Forms
The forms in AngularJS are used for validation of input controls and help with data-binding and. When a form object is found by the AngularJS compiler, the compiler uses the ngForm directive to create a form controller. The form controller object then searches for all input elements and creates the controls for each. What is required next is a data model attribute in order to establish two-way data binding, which will give the user instant feedback through the AngularJS validation methods.
Built-in Validation Methods
There are 14 built-in validation methods in AngularJS. These methods work well with HTML5 input elements and are dependable across all major web browsers.
Input Controls
The input controls are the HTML input elements:
input elements
select elements
button elements
textarea elements
Data-Binding
Input controls use the ng-model directive for data-binding.
______________________________________________________________________________
Example_(Form)________________________________________________________________
<!DOCTYPE html>
<html lang="en">
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body>
<div ng-app="exampleApp" ng-controller="formCtrl">
<form novalidate>
First_Name:<br>
<input type="text" ng-model="user.firstName"><br>
Last_Name:<br>
<input type="text" ng-model="user.last_name">
<br><br>
<button ng-click="reset()">RESET</button>
</form>
<p>form = {{user}}</p>
<p>master = {{master}}</p>
</div>
<script>
var app = angular.module('exampleApp', []);
app.controller('formCtrl', function($scope) {
$scope.master = {firstName:"eBook", last_name:"Reader"};
$scope.reset = function() {
$scope.user = angular.copy($scope.master);
};
$scope.reset();
});
</script>
</body>
</html>
Output
First Name:
Download
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