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define(
['jquery', 'Bacon'],
function($, Bacon) {
function unquoted(name)
{
var start = 0,
end = name.length;
if (name.length >= 1) {
if (name.charAt(0) == '"') {
start = 1;
if (name.length > 1 && name.charAt(name.length - 1) == '"') {
end = name.length - 1;
}
}
return name.substring(start, end);
}
return name;
}
function setCaret(e, num)
{
e.selectionStart = e.selectionEnd = num;
}
var completer = (function (input_element, dropdown, base_config) {
var config = get_config(base_config),
dropdown_raw = dropdown[0],
options_bus = new Bacon.Bus(),
options = [],
selected_index = -1,
input_element_raw = input_element[0],
completion_start = 0,
completion_end = 0,
minimum_length = 1;
// turn off the browser's autocomplete
input_element.attr('autocomplete', 'off');
//$('.ui-autocomplete').css('width', '10px');
options_bus.onValue(function update_options(new_options) {
options = new_options;
});
input_element.keyup(function(e) {
var ret = undefined;
switch (e.keyCode) {
case 38: //UP
prev_option();
ret = false;
break;
case 40: //DOWN
next_option();
ret = false;
break;
case 27: // Escape
hide();
ret = false;
break;
default:
// This catches cursor move due to keyboard events. no event for cursor movement itself
// below we catch cursor moves due to mouse click
oninput(input_element_raw.value, input_element_raw.selectionStart);
}
return ret;
});
input_element.keydown(function(e) {
switch (e.keyCode) {
case 38:
case 40:
return false;
case 9: // Tab
if (config.hideOnTab) {
hide();
}
break;
}
});
function get_config(base) {
return {
triggerStart: base && base.triggerStart || '#',
triggerEnd: base && base.triggerEnd || ' ',
hideOnTab: base && base.hasOwnProperty('hideOnTab') ? base.hideOnTab : true,
};
}
function completions(text)
{
var ret = [];
for (var name in options) {
if (name.toLowerCase().indexOf(text.toLowerCase()) === 0) {
ret.push(name);
}
}
return ret;
}
function show() {
if (dropdown.children().length > 0) {
dropdown.show();
}
}
function hide()
{
dropdown.hide();
}
/***
* #this is a #
* ^
*
* #this is a #t
* ^
*
* #this and #that then #he
* ^
*/
function oninput(text, cursor) {
var hash = text.slice(0, cursor).lastIndexOf(config.triggerStart);
// TODO check if current completion has been invalidated
_invalidateSelection();
hide();
dropdown_raw.innerHTML = ""; // remove all elements
if (hash == -1 && config.triggerStart != ' ') { // space matches start of string too
return;
}
var space = text.slice(hash + 1).indexOf(config.triggerEnd);
space = space == -1 ? text.length : space;
if (space < cursor) {
return;
}
completion_start = hash + 1;
completion_end = space;
var string = unquoted(text.slice(completion_start, completion_end));
if (string.length < minimum_length) {
return;
}
completions(string).forEach(function(name) {
var suggestion = $('<div class="suggestion-item">' + name + '</div>');
suggestion.on('click', function(e) {
_applySuggestion(name);
input_element.focus();
});
dropdown.append(suggestion);
});
show();
}
function _invalidateSelection() {
update_highlighting(-1);
}
function _move_option(change, default_value) {
var next,
n = dropdown.children().length;
if (n == 0) {
return;
}
show();
if (selected_index == -1) {
next = default_value;
} else {
next = (selected_index + change) % n;
}
update_highlighting(next);
}
function next_option() {
_move_option(1, 0);
}
function prev_option() {
_move_option(dropdown.children().length - 1, dropdown.children().length - 1);
}
function _get_option(index) {
if (dropdown.children().length <= index) {
console.log('error: dropdown does not contain index ' + index +
', it has ' + dropdown.children().length + ' elements');
return '';
}
var e = dropdown.children()[index],
s = e.innerText || e.textContent;
if (s.indexOf(' ') != -1) {
return '"' + s + '"';
}
return s;
}
function _choice(i) {
return dropdown.children().eq(i);
}
function update_highlighting(new_index) {
if (selected_index != -1) {
_choice(selected_index).removeClass('selected');
}
if (new_index != -1) {
_choice(new_index).addClass('selected');
}
selected_index = new_index;
}
function _applySuggestion(str) {
var cur = input_element.val(),
start = cur.slice(0, completion_start) + str + ' ';
input_element.val(start + cur.slice(completion_end));
setCaret(input_element, start.length);
oninput('', 0);
}
function handleEnter() {
if (selected_index == -1) {
return false;
}
_applySuggestion(_get_option(selected_index));
return true;
}
return {
options: options_bus,
oninput: oninput,
next_option: next_option,
prev_option: prev_option,
handleEnter: handleEnter,
};
});
return completer;
});
|
