fix(uiSref): nagivate to state when url is ""

fix($state.href): generate href for state with url: ""

Made resolve values ignore any keys that we're actively trying to resolve, when they also exist in some parent state.
Made ui-sref ignore a single preventDefault that comes from the <a> directive when there is no href (and the ui-sref is on an <a>)

src/state.js

@@ -1116,7 +1116,7 @@ function $StateProvider( $urlRouterProvider, $urlMatcherFactory) {
 
  var nav = (state && options.lossy) ? state.navigable : state;
 
- if (!nav || !nav.url) {
+ if (!nav || nav.url === undefined || nav.url === null) {
  return null;
  }
  return $urlRouter.href(nav.url, filterByKeys(objectKeys(state.params), params || {}), {

src/stateDirectives.js

@@ -86,6 +86,7 @@ function $StateRefDirective($state, $timeout) {
  link: function(scope, element, attrs, uiSrefActive) {
  var ref = parseStateRef(attrs.uiSref, $state.current.name);
  var params = null, url = null, base = stateContext(element) || $state.$current;
+ var newHref = null, isAnchor = element.prop("tagName") === "A";
  var isForm = element[0].nodeName === "FORM";
  var attr = isForm ? "action" : "href", nav = true;
 
@@ -102,7 +103,7 @@ function $StateRefDirective($state, $timeout) {
  if (newVal) params = newVal;
  if (!nav) return;
 
- var newHref = $state.href(ref.state, params, options);
+ newHref = $state.href(ref.state, params, options);
 
  var activeDirective = uiSrefActive[1] || uiSrefActive[0];
  if (activeDirective) {
@@ -134,8 +135,11 @@ function $StateRefDirective($state, $timeout) {
  });
  e.preventDefault();
 
+ // if the state has no URL, ignore one preventDefault from the <a> directive.
+ var ignorePreventDefaultCount = isAnchor && !newHref ? 1: 0;
  e.preventDefault = function() {
- $timeout.cancel(transition);
+ if (ignorePreventDefaultCount-- <= 0)
+ $timeout.cancel(transition);
  };
  }
  });