feat(compiler): special-case class attribute in hostAttributes

Closes angular#1774 Closes angular#1841

Author: pkozlowski-opensource

modules/angular2/src/render/dom/compiler/directive_parser.js

@@ -100,9 +100,7 @@ export class DirectiveParser extends CompileStep {
  }
  if (isPresent(directive.hostAttributes)) {
  MapWrapper.forEach(directive.hostAttributes, (hostAttrValue, hostAttrName) => {
- if (!DOM.hasAttribute(current.element, hostAttrName)) {
- DOM.setAttribute(current.element, hostAttrName, hostAttrValue);
- }
+ this._addHostAttribute(hostAttrName, hostAttrValue, current);
  });
  }
  if (isPresent(directive.readAttributes)) {
@@ -162,6 +160,16 @@ export class DirectiveParser extends CompileStep {
  directiveBinderBuilder.bindHostProperty(hostPropertyName, ast);
  }
 
+ _addHostAttribute(attrName, attrValue, compileElement) {
+ if (StringWrapper.equals(attrName, 'class')) {
+ ListWrapper.forEach(attrValue.split(' '), (className) => {
+ DOM.addClass(compileElement.element, className);
+ });
+ } else if (!DOM.hasAttribute(compileElement.element, attrName)) {
+ DOM.setAttribute(compileElement.element, attrName, attrValue);
+ }
+ }
+
  _splitBindConfig(bindConfig:string) {
  return ListWrapper.map(bindConfig.split('|'), (s) => s.trim());
  }

modules/angular2/test/render/dom/compiler/directive_parser_spec.js

@@ -144,6 +144,15 @@ export function main() {
  expect(DOM.getAttribute(results[0].element, 'attr_name')).toEqual('attr_val');
  });
 
+ it('should add CSS classes if "class" specified in host element attributes', () => {
+ var element = el('<input class="foo baz" some-decor-with-host-attrs>');
+ var results = process(element);
+
+ expect(DOM.hasClass(results[0].element, 'foo')).toBeTruthy();
+ expect(DOM.hasClass(results[0].element, 'bar')).toBeTruthy();
+ expect(DOM.hasClass(results[0].element, 'baz')).toBeTruthy();
+ });
+
  it('should read attribute values', () => {
  var element = el('<input some-decor-props some-attr="someValue">');
  var results = process(element);
@@ -283,7 +292,8 @@ var someDirectiveWithHostProperties = new DirectiveMetadata({
 var someDirectiveWithHostAttributes = new DirectiveMetadata({
  selector: '[some-decor-with-host-attrs]',
  hostAttributes: MapWrapper.createFromStringMap({
- 'attr_name': 'attr_val'
+ 'attr_name': 'attr_val',
+ 'class': 'foo bar'
  })
 });