component events

compiler/generate/index.js

@@ -272,12 +272,13 @@ export default function generate ( parsed, template, options = {} ) {
 			};
 
 			this.on = function on ( eventName, handler ) {
-				callbacks[ eventName ] || ( callbacks[ eventName ] = [] ).push( handler );
+				const handlers = callbacks[ eventName ] || ( callbacks[ eventName ] = [] );
+				handlers.push( handler );
 
 				return {
 					cancel: function () {
-						const index = callbacks.indexOf( handler );
-						if ( ~index ) callbacks.splice( index, 1 );
+						const index = handlers.indexOf( handler );
+						if ( ~index ) handlers.splice( index, 1 );
 					}
 				};
 			};

compiler/generate/visitors/attributes/addComponentAttributes.js

@@ -57,7 +57,7 @@ export default function addComponentAttributes ( generator, node, local ) {
 
 			const usedContexts = new Set();
 			attribute.expression.arguments.forEach( arg => {
-				const contexts = generator.contextualise( arg, true );
+				const contexts = generator.contextualise( arg, true, true );
 
 				contexts.forEach( context => {
 					usedContexts.add( context );
@@ -75,32 +75,13 @@ export default function addComponentAttributes ( generator, node, local ) {
 				return `var ${listName} = this.__svelte.${listName}, ${indexName} = this.__svelte.${indexName}, ${name} = ${listName}[${indexName}]`;
 			});
 
-			const handlerName = generator.current.counter( `${attribute.name}Handler` );
 			const handlerBody = ( declarations.length ? declarations.join( '\n' ) + '\n\n' : '' ) + `[✂${attribute.expression.start}-${attribute.expression.end}✂];`;
 
-			if ( attribute.name in generator.events ) {
 			local.init.push( deindent`
-					const ${handlerName} = template.events.${attribute.name}( ${local.name}, function ( event ) {
+				${local.name}.on( '${attribute.name}', function ( event ) {
 					${handlerBody}
 				});
 			` );
-
-				local.teardown.push( deindent`
-					${handlerName}.teardown();
-				` );
-			} else {
-				local.init.push( deindent`
-					function ${handlerName} ( event ) {
-						${handlerBody}
-					}
-
-					${local.name}.addEventListener( '${attribute.name}', ${handlerName}, false );
-				` );
-
-				local.teardown.push( deindent`
-					${local.name}.removeEventListener( '${attribute.name}', ${handlerName}, false );
-				` );
-			}
 		}
 
 		else if ( attribute.type === 'Binding' ) {

test/compiler/component-events-data/Widget.html

@@ -0,0 +1,3 @@
+<button on:click='fire("select", { selection: "foo" })'>select foo</button>
+<button on:click='fire("select", { selection: "bar" })'>select bar</button>
+<button on:click='fire("select", { selection: "baz" })'>select baz</button>

test/compiler/component-events-data/_config.js

@@ -0,0 +1,26 @@
+import * as assert from 'assert';
+
+export default {
+	test ( component, target, window ) {
+		const buttons = target.querySelectorAll( 'button' );
+		const click = new window.MouseEvent( 'click' );
+
+		const selected = [];
+
+		component.on( 'select', selection => {
+			selected.push( selection );
+		});
+
+		buttons[1].dispatchEvent( click );
+		buttons[2].dispatchEvent( click );
+		buttons[1].dispatchEvent( click );
+		buttons[0].dispatchEvent( click );
+
+		assert.deepEqual( selected, [
+			'bar',
+			'baz',
+			'bar',
+			'foo'
+		]);
+	}
+};

test/compiler/component-events-data/main.html

@@ -0,0 +1,11 @@
+<div>
+	<Widget on:select='fire("select", event.selection)'/>
+</div>
+
+<script>
+	import Widget from './Widget.html';
+
+	export default {
+		components: { Widget }
+	};
+</script>

test/compiler/component-events/Widget.html

@@ -0,0 +1 @@
+<p>i am a widget</p>

test/compiler/component-events/_config.js

@@ -0,0 +1,23 @@
+import * as assert from 'assert';
+
+export default {
+	data: {
+		visible: true
+	},
+	html: '<div><!--#if visible--><p>i am a widget</p></div>', // TODO comment should follow component...
+	test ( component ) {
+		let count = 0;
+
+		component.on( 'widgetTornDown', function () {
+			assert.equal( this, component );
+			count += 1;
+		});
+
+		component.set({ visible: false });
+		assert.equal( count, 1 );
+
+		component.set({ visible: true });
+		component.set({ visible: false });
+		assert.equal( count, 2 );
+	}
+};

test/compiler/component-events/main.html

@@ -0,0 +1,13 @@
+<div>
+	{{#if visible}}
+		<Widget on:teardown='fire("widgetTornDown")'/>
+	{{/if}}
+</div>
+
+<script>
+	import Widget from './Widget.html';
+
+	export default {
+		components: { Widget }
+	};
+</script>