simple-event-handler

Event handler library for both: front-end and back-end

Table of Contents

• Installation

  • Bower
  • npm

• Examples

• Method Chaining

• Documentation

  • #subscribe(eventName, handler, $scope)
  • #fire(eventName, args)
  • #unsubscribe(eventName, handler)
  • #unsubscribeAll(eventName)
  • #once(eventName, handler, $scope)
  • #on(eventName, handler)
  • #emit(eventName)
  • #off(eventName, handler)
  • #offAll(eventName)

• License

Installation

Include File

<script type="text/javascript" src=".../js/simple-event-handler.min.js"></script>

Add simple-event-handler in your angular app to your module.

angular.module('app', ['simple-event-handler']);

Bower

Install via Bower

bower install --save simple-event-handler

npm

Install via npm

npm install --save simple-event-handler

Examples

AngularJS Example

app.run.js

angular
    .module('app', ['simple-event-handler'])
    .run(['$eventHandler', function ($eventHandler) {
        $eventHandler.subscribe('my-event', function(data) {
            // your logic here
        })
    }]);

app.controller.js

angular
    .module('app')
    .controller('MainController', ['$eventHandler', function ($eventHandler) {
        var args = {name: 'some name'}
        $eventHandler.fire('my-event', args);
    }]);

Node.js Example

var eventHandler = require('simple-event-handler');
 
eventHandler.subscribe('my-event', function(data) {
    // your logic here
})
 
...
 
var args = {name: 'some name'}
eventHandler.fire('my-event', args);

Basic Example

var eventHandler = new EventHandler();
 
eventHandler.subscribe('my-event', function(data) {
    // your logic here
})
 
...
 
var args = {name: 'some name'}
eventHandler.fire('my-event', args);

Method Chaining

It's just a nice feature to have ability to create a chains like this:

var result = 0;
var handler = function (data) {
    result = result + data;
};
 
eventHandler
    .once(EVENT_NAME, function () {
        result++;
    })
    .fire(EVENT_NAME) // result = 1
    .fire(EVENT_NAME) // result = 1
    .subscribe(EVENT_NAME, handler)
    .emit(EVENT_NAME, 10) // result = 11
    .on(EVENT_NAME, function (data) {
        result = result * 2 - data;
    })
    .fire(EVENT_NAME, 5) // result = ((11 + 5) * 2) - 5 = 27
    .offAll(EVENT_NAME) // removes everything
    .emit(EVENT_NAME) // no handlers to execute
    .fire(EVENT_NAME) // no handlers to execute
    .on(EVENT_NAME_2, handler)
    .fire(EVENT_NAME_2, 3) // result = 27 + 3 = 30
    .unsubscribe(EVENT_NAME_2, handler)
    .fire(EVENT_NAME_2, 20); // no handlers to execute
 
console.log(result); // --> 30

Documentation

subscribe

Registers new handler function to subscription list for the event named eventName. The handler will be added to the end of the subscription list.

Params

Name	Type	Description
eventName	String|Array<String>	String or array of strings with event name(s)
handler	Function	Function with your logic which will be called once event(s) is fired
$scope	Object	AngularJS $scope object

Handler function has one input parameter with data object which can be passed via #fire(eventName, handler) method

Example

Basic subscription

eventHandler.subscribe('my-event', function(data) {
    // your logic here
})

Multi-subscription

var events = ['ev1', 'ev2', 'custom-event', 'service:update'];
 
eventHandler.subscribe(events, function(data) {
    // your logic here
})

fire

Synchronously calls each of the handlers registered for the event named eventName, in the order they were registered, passing the supplied arguments to each, empty object will be passed instead if nothing provided

Name	Type	Description
eventName	String	Event name to fire
args	*	args that will be passed to each handler function. Can be used as shared resource if it is not a primitive value. Default: {}

Example

eventHandler.subscribe('report:update', function(data) {
    // your logic here
    console.log(data.id); // --> 44
})
 
var report = {
    id: 44,
    title: 'Cost Report',
    isPrivate: false,
    storeInDB: false
};
 
eventHandler.fire('report:update', report);

unsubscribe

Removes registered handler function from subscription list

Name	Type	Description
eventName	String	Event name on which handler was subscribed
handler	Function	Handler function which should be removed from subscription list

Example

var handler = function(data) {
  // your logic here
}
 
eventHandler.subscribe('my-event', handler);
 
eventHandler.fire('my-event');
 
eventHandler.unsubscribe('my-event', handler)

unsubscribeAll

Removes all the registered handler functions for the event named eventName

Name	Type	Description
eventName	String	Event name for which subscription list should be cleaned

Example

eventHandler.subscribe('my-event', function() {
    // handler #1
});
 
eventHandler.subscribe('my-event', function() {
    // handler #2
});
 
eventHandler.subscribe('my-event', function() {
    // handler #3
});
 
eventHandler.fire('my-event');
 
eventHandler.unsubscribeAll('my-event')

once

Adds a one time handler function for the event named eventName. Handler will be removed from subscription list after first execution

Params

Name	Type	Description
eventName	String|Array<String>	String or array of strings with event name(s)
handler	Function	Function with your logic which will be called once event(s) is fired
$scope	Object	AngularJS $scope object

Handler function has one input parameter with data object which can be passed via #fire(eventName, handler) method

Example

Basic subscription

eventHandler.once('my-event', function(data) {
    // your logic here
})

Multi-subscription

var events = ['ev1', 'ev2', 'custom-event', 'service:update'];
 
eventHandler.once(events, function(data) {
    // your logic here
})

on

Alias for #subscribe(eventName, handler)

emit

Alias for #fire(eventName, args)

off

Alias for #unsubscribe(eventName, handler)

offAll

Alias for #unsubscribeAll(eventName)

License

MIT License

Copyright (c) 2017 Volodymyr Lavrynovych

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.