@danielkalen/simplybind/test/specs/data-binding/type-Event.coffee

Magically simple, framework-less one-way/two-way data binding for frontend/backend in ~5kb.

suite "Event", ()->
	test "A number can be provided in the selector with a # prefix to indicate which argument index of the event emitter callback should be used as the binding's value", ()->
		emptyObj = {}
		receiver = 'default':emptyObj, 'custom':emptyObj
		invokeCount = 'default':0, 'custom':0

		SimplyBind('event:focus').of(eventEmitterA)
			.to('default').of receiver
			.and.to ()-> invokeCount.default++

		SimplyBind('event:focus#1').of(eventEmitterA)
			.to('custom').of receiver
			.and.to ()-> invokeCount.custom++
		
		expect(receiver.default).to.equal emptyObj
		expect(receiver.custom).to.equal emptyObj
		expect(invokeCount.default).to.equal 0
		expect(invokeCount.custom).to.equal 0
		
		eventEmitterA.emit 'focus', eventEmitterA
		expect(if isBrowser then receiver.default.target else receiver.default).to.equal eventEmitterA
		expect(receiver.custom).to.be.undefined
		expect(invokeCount.default).to.equal 1
		expect(invokeCount.custom).to.equal 1

		restartSandbox()




	test "Custom events will behave exactly like regular events", ()->
		emptyObj = {}
		receiver = 'default':emptyObj, 'custom':emptyObj
		invokeCount = 'default':0, 'custom':0

		SimplyBind('event:somethingCustom').of(eventEmitterA)
			.to('default').of receiver
			.and.to ()-> invokeCount.default++

		SimplyBind('event:somethingCustom#1').of(eventEmitterA)
			.to('custom').of receiver
			.and.to ()-> invokeCount.custom++
		
		expect(receiver.default).to.equal emptyObj
		expect(receiver.custom).to.equal emptyObj
		expect(invokeCount.default).to.equal 0
		expect(invokeCount.custom).to.equal 0
		
		eventEmitterA.emit 'somethingCustom', eventEmitterA
		expect(if isBrowser then receiver.default.target else receiver.default).to.equal eventEmitterA
		expect(receiver.custom).to.be.undefined
		expect(invokeCount.default).to.equal 1
		expect(invokeCount.custom).to.equal 1

		restartSandbox()




	test "Custom listener/emitter methods can be used", ()->
		emitCount = 0
		receiveCount = 0
		eventEmitterA.customListener 'someEvent', ()-> emitCount++

		SimplyBind('prop2').of(objectA)
			.to('event:someEvent', {emitMethod:'customEmitter', listenMethod:'customListener'}).of(eventEmitterA).bothWays ()-> ++receiveCount
		expect(emitCount).to.equal 1
		expect(receiveCount).to.equal 0
		
		objectA.prop2 = 'whatever'
		expect(emitCount).to.equal 2
		
		eventEmitterA.customEmitter 'someEvent'
		expect(receiveCount).to.equal 1
		expect(objectA.prop2).to.equal 1
		expect(emitCount).to.equal 3
		
		objectA.prop2 = 'whatever again'
		expect(emitCount).to.equal 4
		
		eventEmitterA.customEmitter 'someEvent'
		expect(receiveCount).to.equal 2
		expect(objectA.prop2).to.equal 2
		restartSandbox()




	test "Default listener/emitter methods will be used if custom listener/emitter methods don't exist on the target object", ()->
		emitCount = 0
		receiveCount = 0
		eventEmitterA.customListener 'click', ()-> emitCount++

		SimplyBind('prop2').of(objectA)
			.to('event:click', {listenMethod:'nonexistentListener', emitMethod:'nonexistentDispatcher'}).of(eventEmitterA).bothWays ()-> ++receiveCount
		expect(emitCount).to.equal 1
		expect(receiveCount).to.equal 0
		
		objectA.prop2 = 'whatever'
		expect(emitCount).to.equal 2
		
		eventEmitterA.customEmitter 'click'
		expect(receiveCount).to.equal 1
		expect(objectA.prop2).to.equal 1
		expect(emitCount).to.equal 3
		
		objectA.prop2 = 'whatever again'
		expect(emitCount).to.equal 4
		
		eventEmitterA.customEmitter 'click'
		expect(receiveCount).to.equal 2
		expect(objectA.prop2).to.equal 2
		restartSandbox()




	test "Default listener/emitter methods should match browser's events API for DOM nodes and nodeJS's event API for all others", ()-> if not isBrowser then @skip() else
		receiveCount = browser:0, node:0
		emitCount = browser:0, node:0
		customMethods = {listenMethod:'nonexistentListener', emitMethod:'nonexistentDispatcher'}
		nodeEmitter = new EventEmitter
		
		nodeEmitter.on 'click', ()-> receiveCount.node++
		eventEmitterA.on 'click', ()-> receiveCount.browser++

		SimplyBind('prop2').of(objectA)
			.to('event:click', customMethods).of(nodeEmitter).bothWays ()-> ++emitCount.node
			.and.to('event:click', customMethods).of(eventEmitterA).bothWays ()-> ++emitCount.browser
		
		expect(receiveCount.node, 'receiveCount.node').to.equal 1
		expect(receiveCount.browser, 'receiveCount.browser').to.equal 1
		expect(emitCount.node, 'emitCount.node').to.equal 0
		expect(emitCount.browser, 'emitCount.browser').to.equal 0
		

		objectA.prop2 = 'whatever'
		expect(receiveCount.node, 'receiveCount.node').to.equal 2
		expect(receiveCount.browser, 'receiveCount.browser').to.equal 2
		
		nodeEmitter.emit 'click'
		eventEmitterA.emit 'click'
		expect(emitCount.node, 'emitCount.node').to.equal 1
		expect(emitCount.browser, 'emitCount.browser').to.equal 1
		expect(objectA.prop2, 'objectA.prop2').to.equal 1
		expect(receiveCount.node, 'receiveCount.node').to.equal 4
		expect(receiveCount.browser, 'receiveCount.browser').to.equal 4
		
		objectA.prop2 = 'whatever again'
		expect(receiveCount.node, 'receiveCount.node').to.equal 5
		expect(receiveCount.browser, 'receiveCount.browser').to.equal 5
		
		nodeEmitter.emit 'click'
		eventEmitterA.emit 'click'
		expect(emitCount.node, 'emitCount.node').to.equal 2
		expect(emitCount.browser, 'emitCount.browser').to.equal 2
		expect(objectA.prop2, 'objectA.prop2').to.equal 2
		restartSandbox()



	test "Binding events to the DOM document should work as expected", ()-> if not isBrowser then @skip() else
		receiveCount = 0
		emitCount = 0

		document.addEventListener 'click', ()-> receiveCount++

		Interface =
		SimplyBind('prop2').of(objectA)
			.to('event:click').of(document).bothWays ()-> ++emitCount

		expect(receiveCount).to.equal 1
		expect(emitCount).to.equal 0
		
		objectA.prop2 = 'whatever'
		expect(receiveCount).to.equal 2
		
		HTMLElement::emit.call document, 'click'
		expect(emitCount).to.equal 1
		expect(receiveCount).to.equal 3
		expect(objectA.prop2).to.equal 1
		
		objectA.prop2 = 'whatever again'
		expect(receiveCount).to.equal 4
		
		HTMLElement::emit.call document, 'click'
		expect(emitCount).to.equal 2
		expect(objectA.prop2).to.equal 2
		Interface.unBind(true)
		restartSandbox()



	test "Binding events to the DOM window should work as expected", ()-> if not isBrowser then @skip() else
		receiveCount = 0
		emitCount = 0

		window.addEventListener 'click', ()-> receiveCount++

		Interface =
		SimplyBind('prop2').of(objectA)
			.to('event:click').of(window).bothWays ()-> ++emitCount

		expect(receiveCount).to.equal 1
		expect(emitCount).to.equal 0
		
		objectA.prop2 = 'whatever'
		expect(receiveCount).to.equal 2
		
		HTMLElement::emit.call window, 'click'
		expect(emitCount).to.equal 1
		expect(receiveCount).to.equal 3
		expect(objectA.prop2).to.equal 1
		
		objectA.prop2 = 'whatever again'
		expect(receiveCount).to.equal 4
		
		HTMLElement::emit.call window, 'click'
		expect(emitCount).to.equal 2
		expect(objectA.prop2).to.equal 2
		Interface.unBind(true)
		restartSandbox()