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[Seppo.git] / doc / wb / themes / current / awesomplete.js

/**
 * Simple, lightweight, usable local autocomplete library for modern browsers
 * Because there weren’t enough autocomplete scripts in the world? Because I’m completely insane and have NIH syndrome? Probably both. :P
 * @author Lea Verou http://leaverou.github.io/awesomplete
 * MIT license
 */

(function () {

var _ = function (input, o) {
        var me = this;
    
    // Keep track of number of instances for unique IDs
    Awesomplete.count = (Awesomplete.count || 0) + 1;
    this.count = Awesomplete.count;

        // Setup

        this.isOpened = false;

        this.input = $(input);
        this.input.setAttribute("autocomplete", "off");
        this.input.setAttribute("aria-owns", "awesomplete_list_" + this.count);
        this.input.setAttribute("role", "combobox");

        o = o || {};

        configure(this, {
                minChars: 2,
                maxItems: 10,
                autoFirst: false,
                data: _.DATA,
                filter: _.FILTER_CONTAINS,
                sort: o.sort === false ? false : _.SORT_BYLENGTH,
                item: _.ITEM,
                replace: _.REPLACE
        }, o);

        this.index = -1;

        // Create necessary elements

        this.container = $.create("div", {
                className: "awesomplete",
                around: input
        });

        this.ul = $.create("ul", {
                hidden: "hidden",
        role: "listbox",
        id: "awesomplete_list_" + this.count,
                inside: this.container
        });

        this.status = $.create("span", {
                className: "visually-hidden",
                role: "status",
                "aria-live": "assertive",
        "aria-atomic": true,
        inside: this.container,
        textContent: this.minChars != 0 ? ("Type " + this.minChars + " or more characters for results.") : "Begin typing for results."
        });

        // Bind events

        this._events = {
                input: {
                        "input": this.evaluate.bind(this),
                        "blur": this.close.bind(this, { reason: "blur" }),
                        "keydown": function(evt) {
                                var c = evt.keyCode;

                                // If the dropdown `ul` is in view, then act on keydown for the following keys:
                                // Enter / Esc / Up / Down
                                if(me.opened) {
                                        if (c === 13 && me.selected) { // Enter
                                                evt.preventDefault();
                                                me.select();
                                        }
                                        else if (c === 27) { // Esc
                                                me.close({ reason: "esc" });
                                        }
                                        else if (c === 38 || c === 40) { // Down/Up arrow
                                                evt.preventDefault();
                                                me[c === 38? "previous" : "next"]();
                                        }
                                }
                        }
                },
                form: {
                        "submit": this.close.bind(this, { reason: "submit" })
                },
                ul: {
                        "mousedown": function(evt) {
                                var li = evt.target;

                                if (li !== this) {

                                        while (li && !/li/i.test(li.nodeName)) {
                                                li = li.parentNode;
                                        }

                                        if (li && evt.button === 0) {  // Only select on left click
                                                evt.preventDefault();
                                                me.select(li, evt.target);
                                        }
                                }
                        }
                }
        };

        $.bind(this.input, this._events.input);
        $.bind(this.input.form, this._events.form);
        $.bind(this.ul, this._events.ul);

        if (this.input.hasAttribute("list")) {
                this.list = "#" + this.input.getAttribute("list");
                this.input.removeAttribute("list");
        }
        else {
                this.list = this.input.getAttribute("data-list") || o.list || [];
        }

        _.all.push(this);
};

_.prototype = {
        set list(list) {
                if (Array.isArray(list)) {
                        this._list = list;
                }
                else if (typeof list === "string" && list.indexOf(",") > -1) {
                                this._list = list.split(/\s*,\s*/);
                }
                else { // Element or CSS selector
                        list = $(list);

                        if (list && list.children) {
                                var items = [];
                                slice.apply(list.children).forEach(function (el) {
                                        if (!el.disabled) {
                                                var text = el.textContent.trim();
                                                var value = el.value || text;
                                                var label = el.label || text;
                                                if (value !== "") {
                                                        items.push({ label: label, value: value });
                                                }
                                        }
                                });
                                this._list = items;
                        }
                }

                if (document.activeElement === this.input) {
                        this.evaluate();
                }
        },

        get selected() {
                return this.index > -1;
        },

        get opened() {
                return this.isOpened;
        },

        close: function (o) {
                if (!this.opened) {
                        return;
                }

                this.ul.setAttribute("hidden", "");
                this.isOpened = false;
                this.index = -1;

                $.fire(this.input, "awesomplete-close", o || {});
        },

        open: function () {
                this.ul.removeAttribute("hidden");
                this.isOpened = true;

                if (this.autoFirst && this.index === -1) {
                        this.goto(0);
                }

                $.fire(this.input, "awesomplete-open");
        },

        destroy: function() {
                //remove events from the input and its form
                $.unbind(this.input, this._events.input);
                $.unbind(this.input.form, this._events.form);

                //move the input out of the awesomplete container and remove the container and its children
                var parentNode = this.container.parentNode;

                parentNode.insertBefore(this.input, this.container);
                parentNode.removeChild(this.container);

                //remove autocomplete and aria-autocomplete attributes
                this.input.removeAttribute("autocomplete");
                this.input.removeAttribute("aria-autocomplete");

                //remove this awesomeplete instance from the global array of instances
                var indexOfAwesomplete = _.all.indexOf(this);

                if (indexOfAwesomplete !== -1) {
                        _.all.splice(indexOfAwesomplete, 1);
                }
        },

        next: function () {
                var count = this.ul.children.length;
                this.goto(this.index < count - 1 ? this.index + 1 : (count ? 0 : -1) );
        },

        previous: function () {
                var count = this.ul.children.length;
                var pos = this.index - 1;

                this.goto(this.selected && pos !== -1 ? pos : count - 1);
        },

        // Should not be used, highlights specific item without any checks!
        goto: function (i) {
                var lis = this.ul.children;

                if (this.selected) {
                        lis[this.index].setAttribute("aria-selected", "false");
                }

                this.index = i;

                if (i > -1 && lis.length > 0) {
                        lis[i].setAttribute("aria-selected", "true");
            
                        this.status.textContent = lis[i].textContent + ", list item " + (i + 1) + " of " + lis.length;
            
            this.input.setAttribute("aria-activedescendant", this.ul.id + "_item_" + this.index);

                        // scroll to highlighted element in case parent's height is fixed
                        this.ul.scrollTop = lis[i].offsetTop - this.ul.clientHeight + lis[i].clientHeight;

                        $.fire(this.input, "awesomplete-highlight", {
                                text: this.suggestions[this.index]
                        });
                }
        },

        select: function (selected, origin) {
                if (selected) {
                        this.index = $.siblingIndex(selected);
                } else {
                        selected = this.ul.children[this.index];
                }

                if (selected) {
                        var suggestion = this.suggestions[this.index];

                        var allowed = $.fire(this.input, "awesomplete-select", {
                                text: suggestion,
                                origin: origin || selected
                        });

                        if (allowed) {
                                this.replace(suggestion);
                                this.close({ reason: "select" });
                                $.fire(this.input, "awesomplete-selectcomplete", {
                                        text: suggestion
                                });
                        }
                }
        },

        evaluate: function() {
                var me = this;
                var value = this.input.value;

                if (value.length >= this.minChars && this._list.length > 0) {
                        this.index = -1;
                        // Populate list with options that match
                        this.ul.innerHTML = "";

                        this.suggestions = this._list
                                .map(function(item) {
                                        return new Suggestion(me.data(item, value));
                                })
                                .filter(function(item) {
                                        return me.filter(item, value);
                                });

                        if (this.sort !== false) {
                                this.suggestions = this.suggestions.sort(this.sort);
                        }

                        this.suggestions = this.suggestions.slice(0, this.maxItems);

                        this.suggestions.forEach(function(text, index) {
                                        me.ul.appendChild(me.item(text, value, index));
                                });

                        if (this.ul.children.length === 0) {
                
                this.status.textContent = "No results found";
                
                                this.close({ reason: "nomatches" });
        
                        } else {
                                this.open();
        
                this.status.textContent = this.ul.children.length + " results found";
                        }
                }
                else {
                        this.close({ reason: "nomatches" });
            
                this.status.textContent = "No results found";
                }
        }
};

// Static methods/properties

_.all = [];

_.FILTER_CONTAINS = function (text, input) {
        return RegExp($.regExpEscape(input.trim()), "i").test(text);
};

_.FILTER_STARTSWITH = function (text, input) {
        return RegExp("^" + $.regExpEscape(input.trim()), "i").test(text);
};

_.SORT_BYLENGTH = function (a, b) {
        if (a.length !== b.length) {
                return a.length - b.length;
        }

        return a < b? -1 : 1;
};

_.ITEM = function (text, input, item_id) {
        var html = input.trim() === "" ? text : text.replace(RegExp($.regExpEscape(input.trim()), "gi"), "<mark>$&</mark>");
        return $.create("li", {
                innerHTML: html,
                "aria-selected": "false",
        "id": "awesomplete_list_" + this.count + "_item_" + item_id
        });
};

_.REPLACE = function (text) {
        this.input.value = text.value;
};

_.DATA = function (item/*, input*/) { return item; };

// Private functions

function Suggestion(data) {
        var o = Array.isArray(data)
          ? { label: data[0], value: data[1] }
          : typeof data === "object" && "label" in data && "value" in data ? data : { label: data, value: data };

        this.label = o.label || o.value;
        this.value = o.value;
}
Object.defineProperty(Suggestion.prototype = Object.create(String.prototype), "length", {
        get: function() { return this.label.length; }
});
Suggestion.prototype.toString = Suggestion.prototype.valueOf = function () {
        return "" + this.label;
};

function configure(instance, properties, o) {
        for (var i in properties) {
                var initial = properties[i],
                    attrValue = instance.input.getAttribute("data-" + i.toLowerCase());

                if (typeof initial === "number") {
                        instance[i] = parseInt(attrValue);
                }
                else if (initial === false) { // Boolean options must be false by default anyway
                        instance[i] = attrValue !== null;
                }
                else if (initial instanceof Function) {
                        instance[i] = null;
                }
                else {
                        instance[i] = attrValue;
                }

                if (!instance[i] && instance[i] !== 0) {
                        instance[i] = (i in o)? o[i] : initial;
                }
        }
}

// Helpers

var slice = Array.prototype.slice;

function $(expr, con) {
        return typeof expr === "string"? (con || document).querySelector(expr) : expr || null;
}

function $$(expr, con) {
        return slice.call((con || document).querySelectorAll(expr));
}

$.create = function(tag, o) {
        var element = document.createElement(tag);

        for (var i in o) {
                var val = o[i];

                if (i === "inside") {
                        $(val).appendChild(element);
                }
                else if (i === "around") {
                        var ref = $(val);
                        ref.parentNode.insertBefore(element, ref);
                        element.appendChild(ref);
                }
                else if (i in element) {
                        element[i] = val;
                }
                else {
                        element.setAttribute(i, val);
                }
        }

        return element;
};

$.bind = function(element, o) {
        if (element) {
                for (var event in o) {
                        var callback = o[event];

                        event.split(/\s+/).forEach(function (event) {
                                element.addEventListener(event, callback);
                        });
                }
        }
};

$.unbind = function(element, o) {
        if (element) {
                for (var event in o) {
                        var callback = o[event];

                        event.split(/\s+/).forEach(function(event) {
                                element.removeEventListener(event, callback);
                        });
                }
        }
};

$.fire = function(target, type, properties) {
        var evt = document.createEvent("HTMLEvents");

        evt.initEvent(type, true, true );

        for (var j in properties) {
                evt[j] = properties[j];
        }

        return target.dispatchEvent(evt);
};

$.regExpEscape = function (s) {
        return s.replace(/[-\\^$*+?.()|[\]{}]/g, "\\$&");
};

$.siblingIndex = function (el) {
        /* eslint-disable no-cond-assign */
        for (var i = 0; el = el.previousElementSibling; i++);
        return i;
};

// Initialization

function init() {
        $$("input.awesomplete").forEach(function (input) {
                new _(input);
        });
}

// Make sure to export Awesomplete on self when in a browser
if (typeof self !== "undefined") {
        self.Awesomplete = _;
}

// Are we in a browser? Check for Document constructor
if (typeof Document !== "undefined") {
        // DOM already loaded?
        if (document.readyState !== "loading") {
                init();
        }
        else {
                // Wait for it
                document.addEventListener("DOMContentLoaded", init);
        }
}

_.$ = $;
_.$$ = $$;

// Expose Awesomplete as a CJS module
if (typeof module === "object" && module.exports) {
        module.exports = _;
}

return _;

}());