fix(router): router-link works without params

Router-link attaches a listener to prevent default behavior and
navigate.

Closes: 1689

modules/angular2/src/router/path_recognizer.js

@@ -1,4 +1,4 @@
-import {RegExp, RegExpWrapper, RegExpMatcherWrapper, StringWrapper, isPresent} from 'angular2/src/facade/lang';
+import {RegExp, RegExpWrapper, RegExpMatcherWrapper, StringWrapper, isPresent, isBlank, BaseException} from 'angular2/src/facade/lang';
 import {Map, MapWrapper, StringMap, StringMapWrapper, List, ListWrapper} from 'angular2/src/facade/collection';
 
 import {escapeRegex} from './url';
@@ -27,6 +27,9 @@ class DynamicSegment {
   }
 
   generate(params:StringMap) {
+    if (!StringMapWrapper.contains(params, this.name)) {
+      throw new BaseException(`Route generator for '${this.name}' was not included in parameters passed.`)
+    }
     return StringMapWrapper.get(params, this.name);
   }
 }
@@ -118,6 +121,7 @@ export class PathRecognizer {
   }
 
   generate(params:StringMap):string {
-    return ListWrapper.join(ListWrapper.map(this.segments, (segment) => '/' + segment.generate(params)), '');
+    return ListWrapper.join(ListWrapper.map(this.segments, (segment) =>
+      '/' + segment.generate(params)), '');
   }
 }

modules/angular2/src/router/router_link.js

@@ -1,5 +1,6 @@
-import {Directive} from 'angular2/src/core/annotations_impl/annotations';
+import {Directive, onAllChangesDone} from 'angular2/src/core/annotations_impl/annotations';
 import {ElementRef} from 'angular2/core';
+import {StringMap, StringMapWrapper} from 'angular2/src/facade/collection';
 
 import {isPresent} from 'angular2/src/facade/lang';
 import {DOM} from 'angular2/src/dom/dom_adapter';
@@ -32,33 +33,40 @@ import {Router} from './router';
   properties: {
     'route': 'routerLink',
     'params': 'routerParams'
-  }
+  },
+  lifecycle: [onAllChangesDone]
 })
 export class RouterLink {
   _domEl;
   _route:string;
   _params:any;
   _router:Router;
-  //TODO: handle click events
+  _href:string;
 
   constructor(elementRef:ElementRef, router:Router) {
     this._domEl = elementRef.domElement;
     this._router = router;
+    this._params = StringMapWrapper.create();
+    DOM.on(this._domEl, 'click', (evt) => {
+      evt.preventDefault();
+      this._router.navigate(this._href);
+    });
   }
 
   set route(changes) {
     this._route = changes;
-    this.updateHref();
   }
 
   set params(changes) {
     this._params = changes;
-    this.updateHref();
   }
 
-  updateHref() {
+  onAllChangesDone() {
     if (isPresent(this._route) && isPresent(this._params)) {
       var newHref = this._router.generate(this._route, this._params);
+      this._href = newHref;
+      // Keeping the link on the element to support contextual menu `copy link`
+      // and other in-browser affordances.
       DOM.setAttribute(this._domEl, 'href', newHref);
     }
   }

modules/angular2/src/router/router_outlet.js

@@ -18,7 +18,7 @@ export class RouterOutlet {
   _router:routerMod.Router;
   _viewContainer:ViewContainerRef;
 
-  constructor(viewContainer:ViewContainerRef, compiler:Compiler, router:routerMod.Router, injector:Injector, @Attribute('name') nameAttr) {
+  constructor(viewContainer:ViewContainerRef, compiler:Compiler, router:routerMod.Router, injector:Injector, @Attribute('name') nameAttr:String) {
     if (isBlank(nameAttr)) {
       nameAttr = 'default';
     }