all files / app/core/directives/ms-search-bar/ ms-search-bar.directive.js

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(function ()
{
    'use strict';
 
    angular
        .module('app.core')
        .controller('MsSearchBarController', MsSearchBarController)
        .directive('msSearchBar', msSearchBarDirective);
 
    /** @ngInject */
    function MsSearchBarController($scope, $element, $timeout)
    {
        var vm = this;
 
        // Data
        vm.collapsed = true;
        vm.query = '';
        vm.queryOptions = {
            debounce: vm.debounce || 0
        };
        vm.resultsLoading = false;
        vm.results = null;
        vm.selectedResultIndex = 0;
        vm.ignoreMouseEvents = false;
 
        // Methods
        vm.populateResults = populateResults;
 
        vm.expand = expand;
        vm.collapse = collapse;
 
        vm.absorbEvent = absorbEvent;
        vm.handleKeydown = handleKeydown;
        vm.handleMouseenter = handleMouseenter;
        vm.temporarilyIgnoreMouseEvents = temporarilyIgnoreMouseEvents;
        vm.handleResultClick = handleResultClick;
        vm.ensureSelectedResultIsVisible = ensureSelectedResultIsVisible;
 
        //////////
 
        init();
 
        function init()
        {
            // Watch the model changes to trigger the search
            $scope.$watch('MsSearchBar.query', function (current, old)
            {
                if ( angular.isUndefined(current) )
                {
                    return;
                }
 
                if ( angular.equals(current, old) )
                {
                    return;
                }
 
                if ( vm.collapsed )
                {
                    return;
                }
 
                // Evaluate the onSearch function to access the
                // function itself
                var onSearchEvaluated = $scope.$parent.$eval(vm.onSearch, {query: current}),
                    isArray = angular.isArray(onSearchEvaluated),
                    isPromise = (onSearchEvaluated && !!onSearchEvaluated.then);
 
                if ( isArray )
                {
                    // Populate the results
                    vm.populateResults(onSearchEvaluated);
                }
 
                if ( isPromise )
                {
                    // Show the loader
                    vm.resultsLoading = true;
 
                    onSearchEvaluated.then(
                        // Success
                        function (response)
                        {
                            // Populate the results
                            vm.populateResults(response);
                        },
                        // Error
                        function ()
                        {
                            // Assign an empty array to show
                            // the no-results screen
                            vm.populateResults([]);
                        }
                    ).finally(function ()
                        {
                            // Hide the loader
                            vm.resultsLoading = false;
                        }
                    );
                }
            });
        }
 
        /**
         * Populate the results
         *
         * @param results
         */
        function populateResults(results)
        {
            // Before doing anything,
            // make sure the search bar is expanded
            if ( vm.collapsed )
            {
                return;
            }
 
            var isArray = angular.isArray(results),
                isNull = results === null;
 
            // Only accept arrays and null values
            if ( !isArray && !isNull )
            {
                return;
            }
 
            // Reset the selected result
            vm.selectedResultIndex = 0;
 
            // Populate the results
            vm.results = results;
        }
 
        /**
         * Expand
         */
        function expand()
        {
            // Set collapsed status
            vm.collapsed = false;
 
            // Call expand on scope
            $scope.expand();
 
            // Callback
            if ( vm.onExpand && angular.isFunction(vm.onExpand) )
            {
                vm.onExpand();
            }
        }
 
        /**
         * Collapse
         */
        function collapse()
        {
            // Empty the query
            vm.query = '';
 
            // Empty results to hide the results view
            vm.populateResults(null);
 
            // Set collapsed status
            vm.collapsed = true;
 
            // Call collapse on scope
            $scope.collapse();
 
            // Callback
            if ( vm.onCollapse && angular.isFunction(vm.onCollapse) )
            {
                vm.onCollapse();
            }
        }
 
        /**
         * Absorb the given event
         *
         * @param event
         */
        function absorbEvent(event)
        {
            event.preventDefault();
        }
 
        /**
         * Handle keydown
         *
         * @param event
         */
        function handleKeydown(event)
        {
            var keyCode = event.keyCode,
                keys = [27, 38, 40];
 
            // Prevent the default action if
            // one of the keys are pressed that
            // we are listening
            if ( keys.indexOf(keyCode) > -1 )
            {
                event.preventDefault();
            }
 
            switch ( keyCode )
            {
                // Enter
                case 13:
 
                    // Trigger result click
                    vm.handleResultClick(vm.results[vm.selectedResultIndex]);
 
                    break;
 
                // Escape
                case 27:
 
                    // Collapse the search bar
                    vm.collapse();
 
                    break;
 
                // Up Arrow
                case 38:
 
                    // Decrease the selected result index
                    if ( vm.selectedResultIndex - 1 >= 0 )
                    {
                        // Decrease the selected index
                        vm.selectedResultIndex--;
 
                        // Make sure the selected result is in the view
                        vm.ensureSelectedResultIsVisible();
                    }
 
                    break;
 
                // Down Arrow
                case 40:
 
                    if ( !vm.results )
                    {
                        return;
                    }
 
                    // Increase the selected result index
                    if ( vm.selectedResultIndex + 1 < vm.results.length )
                    {
                        // Increase the selected index
                        vm.selectedResultIndex++;
 
                        // Make sure the selected result is in the view
                        vm.ensureSelectedResultIsVisible();
                    }
 
                    break;
 
                default:
                    break;
            }
        }
 
        /**
         * Handle mouseenter
         *
         * @param index
         */
        function handleMouseenter(index)
        {
            if ( vm.ignoreMouseEvents )
            {
                return;
            }
 
            // Update the selected result index
            // with the given index
            vm.selectedResultIndex = index;
        }
 
        /**
         * Set a variable for a limited time
         * to make other functions to ignore
         * the mouse events
         */
        function temporarilyIgnoreMouseEvents()
        {
            // Set the variable
            vm.ignoreMouseEvents = true;
 
            // Cancel the previous timeout
            $timeout.cancel(vm.mouseEventIgnoreTimeout);
 
            // Set the timeout
            vm.mouseEventIgnoreTimeout = $timeout(function ()
            {
                vm.ignoreMouseEvents = false;
            }, 250);
        }
 
        /**
         * Handle the result click
         *
         * @param item
         */
        function handleResultClick(item)
        {
            if ( vm.onResultClick )
            {
                vm.onResultClick({item: item});
            }
 
            // Collapse the search bar
            vm.collapse();
        }
 
        /**
         * Ensure the selected result will
         * always be visible on the results
         * area
         */
        function ensureSelectedResultIsVisible()
        {
            var resultsEl = $element.find('.ms-search-bar-results'),
                selectedItemEl = angular.element(resultsEl.find('.result')[vm.selectedResultIndex]);
 
            if ( resultsEl && selectedItemEl )
            {
                var top = selectedItemEl.position().top - 8,
                    bottom = selectedItemEl.position().top + selectedItemEl.outerHeight() + 8;
 
                // Start ignoring mouse events
                vm.temporarilyIgnoreMouseEvents();
 
                if ( resultsEl.scrollTop() > top )
                {
                    resultsEl.scrollTop(top);
                }
 
                if ( bottom > (resultsEl.height() + resultsEl.scrollTop()) )
                {
                    resultsEl.scrollTop(bottom - resultsEl.height());
                }
            }
        }
    }
 
    /** @ngInject */
    function msSearchBarDirective($document)
    {
        return {
            restrict        : 'E',
            scope           : {},
            require         : 'msSearchBar',
            controller      : 'MsSearchBarController as MsSearchBar',
            bindToController: {
                debounce     : '=?',
                onSearch     : '@',
                onResultClick: '&?',
                onExpand     : '&?',
                onCollapse   : '&?'
            },
            templateUrl     : 'app/core/directives/ms-search-bar/ms-search-bar.html',
            compile         : function (tElement)
            {
                // Add class
                tElement.addClass('ms-search-bar');
 
                return function postLink(scope, iElement)
                {
                    // Data
                    var inputEl,
                        bodyEl = $document.find('body');
 
                    // Methods
                    scope.collapse = collapse;
                    scope.expand = expand;
 
                    //////////
 
                    // Initialize
                    init();
 
                    /**
                     * Initialize
                     */
                    function init()
                    {
                        // Grab the input element
                        inputEl = iElement.find('#ms-search-bar-input');
                    }
 
                    /**
                     * Expand action
                     */
                    function expand()
                    {
                        // Add expanded class
                        iElement.addClass('expanded');
 
                        // Add helper class to the body
                        bodyEl.addClass('ms-search-bar-expanded');
 
                        // Focus on the input
                        inputEl.focus();
                    }
 
                    /**
                     * Collapse action
                     */
                    function collapse()
                    {
                        // Remove expanded class
                        iElement.removeClass('expanded');
 
                        // Remove helper class from the body
                        bodyEl.removeClass('ms-search-bar-expanded');
                    }
                };
            }
        };
    }
})();