feat(typeahead): add typeahead directive

src/typeahead/docs/demo.html

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+<div class='container-fluid' ng-controller="TypeaheadCtrl">
+    <pre>Model: {{selected| json}}</pre>
+    <input type="text" ng-model="selected" typeahead="state for state in states | filter:$viewValue">
+</div>

src/typeahead/docs/readme.md

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+Typeahead is a AngularJS version of [Twitter Bootstrap typeahead plugin](http://twitter.github.com/bootstrap/javascript.html#typeahead)
+
+This directive can be used to quickly create elegant typeheads with any form text input.
+
+It is very well integrated into the AngularJS as:
+
+* it uses the same, flexible syntax as the `select` directive (http://docs.angularjs.org/api/ng.directive:select)
+* works with promises and it means that you can retrieve matches using the `$http` service with minimal effort

src/typeahead/test/typeahead.spec.js

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+describe('typeahead tests', function () {
+
+  beforeEach(module('ui.bootstrap.typeahead'));
+  beforeEach(module('template/typeahead/typeahead.html'));
+
+  describe('syntax parser', function () {
+
+    var typeaheadParser, scope, filterFilter;
+    beforeEach(inject(function (_$rootScope_, _filterFilter_, _typeaheadParser_) {
+      typeaheadParser = _typeaheadParser_;
+      scope = _$rootScope_;
+      filterFilter = _filterFilter_;
+    }));
+
+    it('should parse the simplest array-based syntax', function () {
+      scope.states = ['Alabama', 'California', 'Delaware'];
+      var result = typeaheadParser.parse('state for state in states | filter:$viewValue');
+
+      var itemName = result.itemName;
+      var locals = {$viewValue:'al'};
+      expect(result.source(scope, locals)).toEqual(['Alabama', 'California']);
+
+      locals[itemName] = 'Alabama';
+      expect(result.viewMapper(scope, locals)).toEqual('Alabama');
+      expect(result.modelMapper(scope, locals)).toEqual('Alabama');
+    });
+
+    it('should parse the simplest function-based syntax', function () {
+      scope.getStates = function ($viewValue) {
+        return filterFilter(['Alabama', 'California', 'Delaware'], $viewValue);
+      };
+      var result = typeaheadParser.parse('state for state in getStates($viewValue)');
+
+      var itemName = result.itemName;
+      var locals = {$viewValue:'al'};
+      expect(result.source(scope, locals)).toEqual(['Alabama', 'California']);
+
+      locals[itemName] = 'Alabama';
+      expect(result.viewMapper(scope, locals)).toEqual('Alabama');
+      expect(result.modelMapper(scope, locals)).toEqual('Alabama');
+    });
+
+    it('should allow to specify custom model mapping that is used as a label as well', function () {
+
+      scope.states = [
+        {code:'AL', name:'Alabama'},
+        {code:'CA', name:'California'},
+        {code:'DE', name:'Delaware'}
+      ];
+      var result = typeaheadParser.parse("state.name for state in states | filter:$viewValue | orderBy:'name':true");
+
+      var itemName = result.itemName;
+      expect(itemName).toEqual('state');
+      expect(result.source(scope, {$viewValue:'al'})).toEqual([
+        {code:'CA', name:'California'},
+        {code:'AL', name:'Alabama'}
+      ]);
+
+      var locals = {$viewValue:'al'};
+      locals[itemName] = {code:'AL', name:'Alabama'};
+      expect(result.viewMapper(scope, locals)).toEqual('Alabama');
+      expect(result.modelMapper(scope, locals)).toEqual('Alabama');
+    });
+
+    it('should allow to specify custom view and model mappers', function () {
+
+      scope.states = [
+        {code:'AL', name:'Alabama'},
+        {code:'CA', name:'California'},
+        {code:'DE', name:'Delaware'}
+      ];
+      var result = typeaheadParser.parse("state.code as state.name + ' ('+state.code+')' for state in states | filter:$viewValue | orderBy:'name':true");
+
+      var itemName = result.itemName;
+      expect(result.source(scope, {$viewValue:'al'})).toEqual([
+        {code:'CA', name:'California'},
+        {code:'AL', name:'Alabama'}
+      ]);
+
+      var locals = {$viewValue:'al'};
+      locals[itemName] = {code:'AL', name:'Alabama'};
+      expect(result.viewMapper(scope, locals)).toEqual('Alabama (AL)');
+      expect(result.modelMapper(scope, locals)).toEqual('AL');
+    });
+  });
+
+  describe('typeaheadPopup - result rendering', function () {
+
+    var scope, $rootScope, $compile;
+    beforeEach(inject(function (_$rootScope_, _$compile_) {
+      $rootScope = _$rootScope_;
+      scope = $rootScope.$new();
+      $compile = _$compile_;
+    }));
+
+    it('should render initial results', function () {
+
+      scope.matches = ['foo', 'bar', 'baz'];
+      scope.active = 1;
+
+      var el = $compile("<div><typeahead-popup matches='matches' active='active' select='select(activeIdx)'></typeahead-popup></div>")(scope);
+      $rootScope.$digest();
+
+      var liElems = el.find('li');
+      expect(liElems.length).toEqual(3);
+      expect(liElems.eq(0)).not.toHaveClass('active');
+      expect(liElems.eq(1)).toHaveClass('active');
+      expect(liElems.eq(2)).not.toHaveClass('active');
+    });
+
+    it('should change active item on mouseenter', function () {
+
+      scope.matches = ['foo', 'bar', 'baz'];
+      scope.active = 1;
+
+      var el = $compile("<div><typeahead-popup matches='matches' active='active' select='select(activeIdx)'></typeahead-popup></div>")(scope);
+      $rootScope.$digest();
+
+      var liElems = el.find('li');
+      expect(liElems.eq(1)).toHaveClass('active');
+      expect(liElems.eq(2)).not.toHaveClass('active');
+
+      liElems.eq(2).trigger('mouseenter');
+
+      expect(liElems.eq(1)).not.toHaveClass('active');
+      expect(liElems.eq(2)).toHaveClass('active');
+    });
+
+    it('should select an item on mouse click', function () {
+
+      scope.matches = ['foo', 'bar', 'baz'];
+      scope.active = 1;
+      $rootScope.select = angular.noop;
+      spyOn($rootScope, 'select');
+
+      var el = $compile("<div><typeahead-popup matches='matches' active='active' select='select(activeIdx)'></typeahead-popup></div>")(scope);
+      $rootScope.$digest();
+
+      var liElems = el.find('li');
+      liElems.eq(2).find('a').trigger('click');
+      expect($rootScope.select).toHaveBeenCalledWith(2);
+    });
+  });
+
+  describe('typeahead', function () {
+
+    var $scope, $compile;
+    var changeInputValueTo;
+
+    beforeEach(inject(function (_$rootScope_, _$compile_, $sniffer) {
+      $scope = _$rootScope_;
+      $scope.source = ['foo', 'bar', 'baz'];
+      $compile = _$compile_;
+
+      changeInputValueTo = function (element, value) {
+        var inputEl = findInput(element);
+        inputEl.val(value);
+        inputEl.trigger($sniffer.hasEvent('input') ? 'input' : 'change');
+        $scope.$digest();
+      };
+    }));
+
+    //utility functions
+    var prepareInputEl = function(inputTpl) {
+      var el = $compile(angular.element(inputTpl))($scope);
+      $scope.$digest();
+      return el;
+    };
+
+    var findInput = function(element) {
+      return element.find('input');
+    };
+
+    var findDropDown = function(element) {
+      return element.find('div.dropdown');
+    };
+
+    var findMatches = function(element) {
+      return findDropDown(element).find('li');
+    };
+
+    var triggerKeyDown = function(element, keyCode) {
+      var inputEl = findInput(element);
+      var e = $.Event("keydown");
+      e.which = keyCode;
+      inputEl.trigger(e);
+    };
+
+    //custom matchers
+    beforeEach(function () {
+      this.addMatchers({
+        toBeClosed: function() {
+          var typeaheadEl = findDropDown(this.actual);
+          this.message = function() {
+            return "Expected '" + angular.mock.dump(this.actual) + "' to be closed.";
+          };
+          return !typeaheadEl.hasClass('open') && findMatches(this.actual).length === 0;
+
+        }, toBeOpenWithActive: function(noOfMatches, activeIdx) {
+
+          var typeaheadEl = findDropDown(this.actual);
+          var liEls = findMatches(this.actual);
+
+          this.message = function() {
+            return "Expected '" + angular.mock.dump(this.actual) + "' to be opened.";
+          };
+          return typeaheadEl.hasClass('open') && liEls.length === noOfMatches && $(liEls[activeIdx]).hasClass('active');
+        }
+      });
+    });
+
+    //coarse grained, "integration" tests
+    describe('initial state and model changes', function () {
+
+      it('should be closed by default', function () {
+        var element = prepareInputEl("<div><input ng-model='result' typeahead='item for item in source'></div>");
+        expect(element).toBeClosed();
+      });
+
+      it('should not get open on model change', function () {
+        var element = prepareInputEl("<div><input ng-model='result' typeahead='item for item in source'></div>");
+        $scope.$apply(function(){
+          $scope.result = 'foo';
+        });
+        expect(element).toBeClosed();
+      });
+    });
+
+    describe('basic functionality', function () {
+
+      it('should open and close typeahead based on matches', function () {
+        var element = prepareInputEl("<div><input ng-model='result' typeahead='item for item in source | filter:$viewValue'></div>");
+        changeInputValueTo(element, 'ba');
+        expect(element).toBeOpenWithActive(2, 0);
+      });
+
+      it('should not open typeahead if input value smaller than a defined threshold', function () {
+        var element = prepareInputEl("<div><input ng-model='result' typeahead='item for item in source | filter:$viewValue' typeahead-min-length='2'></div>");
+        changeInputValueTo(element, 'b');
+        expect(element).toBeClosed();
+      });
+
+      it('should support custom model selecting function', function () {
+        $scope.updaterFn = function(selectedItem) {
+          return 'prefix' + selectedItem;
+        };
+        var element = prepareInputEl("<div><input ng-model='result' typeahead='updaterFn(item) as item for item in source | filter:$viewValue'></div>");
+        changeInputValueTo(element, 'f');
+        triggerKeyDown(element, 13);
+        expect($scope.result).toEqual('prefixfoo');
+      });
+
+      it('should support custom label rendering function', function () {
+        $scope.formatterFn = function(sourceItem) {
+          return 'prefix' + sourceItem;
+        };
+
+        var element = prepareInputEl("<div><input ng-model='result' typeahead='item as formatterFn(item) for item in source | filter:$viewValue'></div>");
+        changeInputValueTo(element, 'fo');
+        var matchHighlight = findMatches(element).find('a').html();
+        expect(matchHighlight).toEqual('prefix<strong>fo</strong>o');
+      });
+
+    });
+
+    describe('selecting a match', function () {
+
+      it('should select a match on enter', function () {
+
+        var element = prepareInputEl("<div><input ng-model='result' typeahead='item for item in source | filter:$viewValue'></div>");
+        var inputEl = findInput(element);
+
+        changeInputValueTo(element, 'b');
+        triggerKeyDown(element, 13);
+
+        expect($scope.result).toEqual('bar');
+        expect(inputEl.val()).toEqual('bar');
+      });
+
+      it('should select a match on tab', function () {
+
+        var element = prepareInputEl("<div><input ng-model='result' typeahead='item for item in source | filter:$viewValue'></div>");
+        var inputEl = findInput(element);
+
+        changeInputValueTo(element, 'b');
+        triggerKeyDown(element, 9);
+
+        expect($scope.result).toEqual('bar');
+        expect(inputEl.val()).toEqual('bar');
+      });
+
+      it('should select match on click', function () {
+
+        var element = prepareInputEl("<div><input ng-model='result' typeahead='item for item in source | filter:$viewValue'></div>");
+        var inputEl = findInput(element);
+
+        changeInputValueTo(element, 'b');
+        var match = $(findMatches(element)[1]).find('a')[0];
+
+        $(match).click();
+        $scope.$digest();
+
+        expect($scope.result).toEqual('baz');
+        expect(inputEl.val()).toEqual('baz');
+      });
+    });
+
+  });
+});