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/*!
* jQuery.textcomplete.js
*
* Repositiory: https://github.com/yuku-t/jquery-textcomplete
* License: MIT
* Author: Yuku Takahashi
*/
;(function ($) {
'use strict';
/**
* Exclusive execution control utility.
*/
var lock = function (func) {
var free, locked;
free = function () { locked = false; };
return function () {
var args;
if (locked) return;
locked = true;
args = toArray(arguments);
args.unshift(free);
func.apply(this, args);
};
};
/**
* Convert arguments into a real array.
*/
var toArray = function (args) {
var result;
result = Array.prototype.slice.call(args);
return result;
};
/**
* Get the styles of any element from property names.
*/
var getStyles = (function () {
var color;
color = $('<div></div>').css(['color']).color;
if (typeof color !== 'undefined') {
return function ($el, properties) {
return $el.css(properties);
};
} else { // for jQuery 1.8 or below
return function ($el, properties) {
var styles;
styles = {};
$.each(properties, function (i, property) {
styles[property] = $el.css(property);
});
return styles;
};
}
})();
/**
* Default template function.
*/
var identity = function (obj) { return obj; };
/**
* Memoize a search function.
*/
var memoize = function (func) {
var memo = {};
return function (term, callback) {
if (memo[term]) {
callback(memo[term]);
} else {
func.call(this, term, function (data) {
memo[term] = (memo[term] || []).concat(data);
callback.apply(null, arguments);
});
}
};
};
/**
* Determine if the array contains a given value.
*/
var include = function (array, value) {
var i, l;
if (array.indexOf) return array.indexOf(value) != -1;
for (i = 0, l = array.length; i < l; i++) {
if (array[i] === value) return true;
}
return false;
};
/**
* Textarea manager class.
*/
var Completer = (function () {
var html, css, $baseWrapper, $baseList, _id;
html = {
wrapper: '<div class="textcomplete-wrapper"></div>',
list: '<ul class="dropdown-menu"></ul>'
};
css = {
wrapper: {
position: 'relative'
},
list: {
position: 'absolute',
top: 0,
left: 0,
zIndex: '100',
display: 'none'
}
};
$baseWrapper = $(html.wrapper).css(css.wrapper);
$baseList = $(html.list).css(css.list);
_id = 0;
function Completer($el) {
var focus;
this.el = $el.get(0); // textarea element
focus = this.el === document.activeElement;
// Cannot wrap $el at initialize method lazily due to Firefox's behavior.
this.$el = wrapElement($el); // Focus is lost
this.id = 'textComplete' + _id++;
this.strategies = [];
if (focus) {
this.initialize();
this.$el.focus();
} else {
this.$el.one('focus.textComplete', $.proxy(this.initialize, this));
}
}
/**
* Completer's public methods
*/
$.extend(Completer.prototype, {
/**
* Prepare ListView and bind events.
*/
initialize: function () {
var $list, globalEvents;
$list = $baseList.clone();
this.listView = new ListView($list, this);
this.$el
.before($list)
.on({
'keyup.textComplete': $.proxy(this.onKeyup, this),
'keydown.textComplete': $.proxy(this.listView.onKeydown,
this.listView)
});
globalEvents = {};
globalEvents['click.' + this.id] = $.proxy(this.onClickDocument, this);
globalEvents['keyup.' + this.id] = $.proxy(this.onKeyupDocument, this);
$(document).on(globalEvents);
},
/**
* Register strategies to the completer.
*/
register: function (strategies) {
this.strategies = this.strategies.concat(strategies);
},
/**
* Show autocomplete list next to the caret.
*/
renderList: function (data) {
if (this.clearAtNext) {
this.listView.clear();
this.clearAtNext = false;
}
if (data.length) {
if (!this.listView.shown) {
this.listView
.setPosition(this.getCaretPosition())
.clear()
.activate();
this.listView.strategy = this.strategy;
}
data = data.slice(0, this.strategy.maxCount);
this.listView.render(data);
}
if (!this.listView.data.length && this.listView.shown) {
this.listView.deactivate();
}
},
searchCallbackFactory: function (free) {
var self = this;
return function (data, keep) {
self.renderList(data);
if (!keep) {
// This is the last callback for this search.
free();
self.clearAtNext = true;
}
};
},
/**
* Keyup event handler.
*/
onKeyup: function (e) {
var searchQuery, term;
if (this.skipSearch(e)) { return; }
searchQuery = this.extractSearchQuery(this.getTextFromHeadToCaret());
if (searchQuery.length) {
term = searchQuery[1];
if (this.term === term) return; // Ignore shift-key or something.
this.term = term;
this.search(searchQuery);
} else {
this.term = null;
this.listView.deactivate();
}
},
/**
* Suppress searching if it returns true.
*/
skipSearch: function (e) {
if (this.skipNextKeyup) {
this.skipNextKeyup = false;
return true;
}
switch (e.keyCode) {
case 40:
case 38:
return true;
}
},
onSelect: function (value) {
var pre, post, newSubStr;
pre = this.getTextFromHeadToCaret();
post = this.el.value.substring(this.el.selectionEnd);
newSubStr = this.strategy.replace(value);
if ($.isArray(newSubStr)) {
post = newSubStr[1] + post;
newSubStr = newSubStr[0];
}
pre = pre.replace(this.strategy.match, newSubStr);
this.$el.val(pre + post)
.trigger('change')
.trigger('textComplete:select', value);
this.el.focus();
this.el.selectionStart = this.el.selectionEnd = pre.length;
this.skipNextKeyup = true;
},
/**
* Global click event handler.
*/
onClickDocument: function (e) {
if (e.originalEvent && !e.originalEvent.keepTextCompleteDropdown) {
this.listView.deactivate();
}
},
/**
* Global keyup event handler.
*/
onKeyupDocument: function (e) {
if (this.listView.shown && e.keyCode === 27) { // ESC
this.listView.deactivate();
this.$el.focus();
}
},
/**
* Remove all event handlers and the wrapper element.
*/
destroy: function () {
var $wrapper;
this.$el.off('.textComplete');
$(document).off('.' + this.id);
if (this.listView) { this.listView.destroy(); }
$wrapper = this.$el.parent();
$wrapper.after(this.$el).remove();
this.$el.data('textComplete', void 0);
this.$el = null;
},
// Helper methods
// ==============
/**
* Returns caret's relative coordinates from textarea's left top corner.
*/
getCaretPosition: function () {
// Browser native API does not provide the way to know the position of
// caret in pixels, so that here we use a kind of hack to accomplish
// the aim. First of all it puts a div element and completely copies
// the textarea's style to the element, then it inserts the text and a
// span element into the textarea.
// Consequently, the span element's position is the thing what we want.
if (this.el.selectionEnd === 0) return;
var properties, css, $div, $span, position, dir;
dir = this.$el.attr('dir') || this.$el.css('direction');
properties = ['border-width', 'font-family', 'font-size', 'font-style',
'font-variant', 'font-weight', 'height', 'letter-spacing',
'word-spacing', 'line-height', 'text-decoration', 'text-align',
'width', 'padding-top', 'padding-right', 'padding-bottom',
'padding-left', 'margin-top', 'margin-right', 'margin-bottom',
'margin-left'
];
css = $.extend({
position: 'absolute',
overflow: 'auto',
'white-space': 'pre-wrap',
top: 0,
left: -9999,
direction: dir
}, getStyles(this.$el, properties));
$div = $('<div></div>').css(css).text(this.getTextFromHeadToCaret());
$span = $('<span></span>').text('.').appendTo($div);
this.$el.before($div);
position = $span.position();
position.top += $span.height() - this.$el.scrollTop();
if (dir === 'rtl') { position.left -= this.listView.$el.width(); }
$div.remove();
return position;
},
getTextFromHeadToCaret: function () {
var text, selectionEnd, range;
selectionEnd = this.el.selectionEnd;
if (typeof selectionEnd === 'number') {
text = this.el.value.substring(0, selectionEnd);
} else if (document.selection) {
range = this.el.createTextRange();
range.moveStart('character', 0);
range.moveEnd('textedit');
text = range.text;
}
return text;
},
/**
* Parse the value of textarea and extract search query.
*/
extractSearchQuery: function (text) {
// If a search query found, it returns used strategy and the query
// term. If the caret is currently in a code block or search query does
// not found, it returns an empty array.
var i, l, strategy, match;
for (i = 0, l = this.strategies.length; i < l; i++) {
strategy = this.strategies[i];
match = text.match(strategy.match);
if (match) { return [strategy, match[strategy.index]]; }
}
return [];
},
search: lock(function (free, searchQuery) {
var term;
this.strategy = searchQuery[0];
term = searchQuery[1];
this.strategy.search(term, this.searchCallbackFactory(free));
})
});
/**
* Completer's private functions
*/
var wrapElement = function ($el) {
return $el.wrap($baseWrapper.clone().css('display', $el.css('display')));
};
return Completer;
})();
/**
* Dropdown menu manager class.
*/
var ListView = (function () {
function ListView($el, completer) {
this.data = [];
this.$el = $el;
this.index = 0;
this.completer = completer;
this.$el.on('click.textComplete', 'li.textcomplete-item',
$.proxy(this.onClick, this));
}
$.extend(ListView.prototype, {
shown: false,
render: function (data) {
var html, i, l, index, val;
html = '';
for (i = 0, l = data.length; i < l; i++) {
val = data[i];
if (include(this.data, val)) continue;
index = this.data.length;
this.data.push(val);
html += '<li class="textcomplete-item" data-index="' + index + '"><a>';
html += this.strategy.template(val);
html += '</a></li>';
if (this.data.length === this.strategy.maxCount) break;
}
this.$el.append(html);
if (!this.data.length) {
this.deactivate();
} else {
this.activateIndexedItem();
}
},
clear: function () {
this.data = [];
this.$el.html('');
this.index = 0;
return this;
},
activateIndexedItem: function () {
this.$el.find('.active').removeClass('active');
this.getActiveItem().addClass('active');
},
getActiveItem: function () {
return $(this.$el.children().get(this.index));
},
activate: function () {
if (!this.shown) {
this.$el.show();
this.completer.$el.trigger('textComplete:show');
this.shown = true;
}
return this;
},
deactivate: function () {
if (this.shown) {
this.$el.hide();
this.completer.$el.trigger('textComplete:hide');
this.shown = false;
this.data = this.index = null;
}
return this;
},
setPosition: function (position) {
this.$el.css(position);
return this;
},
select: function (index) {
var self = this;
this.completer.onSelect(this.data[index]);
// Deactive at next tick to allow other event handlers to know whether
// the dropdown has been shown or not.
setTimeout(function () { self.deactivate(); }, 0);
},
onKeydown: function (e) {
if (!this.shown) return;
if (e.keyCode === 38) { // UP
e.preventDefault();
if (this.index === 0) {
this.index = this.data.length-1;
} else {
this.index -= 1;
}
this.activateIndexedItem();
} else if (e.keyCode === 40) { // DOWN
e.preventDefault();
if (this.index === this.data.length - 1) {
this.index = 0;
} else {
this.index += 1;
}
this.activateIndexedItem();
} else if (e.keyCode === 13 || e.keyCode === 9) { // ENTER or TAB
e.preventDefault();
this.select(parseInt(this.getActiveItem().data('index'), 10));
}
},
onClick: function (e) {
var $e = $(e.target);
e.originalEvent.keepTextCompleteDropdown = true;
if (!$e.hasClass('textcomplete-item')) {
$e = $e.parents('li.textcomplete-item');
}
this.select(parseInt($e.data('index'), 10));
},
destroy: function () {
this.deactivate();
this.$el.off('click.textComplete').remove();
this.$el = null;
}
});
return ListView;
})();
$.fn.textcomplete = function (strategies) {
var i, l, strategy, dataKey;
dataKey = 'textComplete';
if (strategies === 'destroy') {
return this.each(function () {
var completer = $(this).data(dataKey);
if (completer) { completer.destroy(); }
});
}
for (i = 0, l = strategies.length; i < l; i++) {
strategy = strategies[i];
if (!strategy.template) {
strategy.template = identity;
}
if (strategy.index == null) {
strategy.index = 2;
}
if (strategy.cache) {
strategy.search = memoize(strategy.search);
}
strategy.maxCount || (strategy.maxCount = 10);
}
return this.each(function () {
var $this, completer;
$this = $(this);
completer = $this.data(dataKey);
if (!completer) {
completer = new Completer($this);
$this.data(dataKey, completer);
}
completer.register(strategies);
});
};
})(window.jQuery || window.Zepto);