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KB.component('suggest-menu', function(containerElement, options) {
function onKeyDown(e) {
switch (e.keyCode) {
case 27:
destroy();
break;
case 38:
e.preventDefault();
e.stopImmediatePropagation();
moveUp();
break;
case 40:
e.preventDefault();
e.stopImmediatePropagation();
moveDown();
break;
case 13:
e.preventDefault();
e.stopImmediatePropagation();
insertSelectedItem();
break;
}
}
function onClick() {
insertSelectedItem();
}
function onMouseOver(element) {
if (KB.dom(element).hasClass('suggest-menu-item')) {
KB.find('.suggest-menu-item.active').removeClass('active');
KB.dom(element).addClass('active');
}
}
function insertSelectedItem() {
var element = KB.find('.suggest-menu-item.active');
var value = element.data('value');
var trigger = element.data('trigger');
var content = containerElement.value;
var text = getLastWord(containerElement);
var substitute = trigger + value + ' ';
var before = content.substring(0, containerElement.selectionStart - text.length);
var after = content.substring(containerElement.selectionEnd);
var position = before.length + substitute.length;
containerElement.value = before + substitute + after;
containerElement.setSelectionRange(position, position);
destroy();
}
function getLastWord(element) {
var lines = element.value.substring(0, element.selectionEnd).split("\n");
var lastLine = lines[lines.length - 1];
var words = lastLine.split(' ');
return words[words.length - 1];
}
function getParentElement() {
var selectors = ['.popover-form', '#popover-content', 'body'];
for (var i = 0; i < selectors.length; i++) {
var element = document.querySelector(selectors[i]);
if (element !== null) {
return element;
}
}
return null;
}
function resetSelection() {
var elements = document.querySelectorAll('.suggest-menu-item');
for (var i = 0; i < elements.length; i++) {
if (KB.dom(elements[i]).hasClass('active')) {
KB.dom(elements[i]).removeClass('active');
break;
}
}
return {items: elements, index: i};
}
function moveUp() {
var result = resetSelection();
if (result.index > 0) {
result.index = result.index - 1;
}
KB.dom(result.items[result.index]).addClass('active');
}
function moveDown() {
var result = resetSelection();
if (result.index < result.items.length - 1) {
result.index++;
}
KB.dom(result.items[result.index]).addClass('active');
}
function destroy() {
var element = KB.find('#suggest-menu');
if (element !== null) {
element.remove();
}
document.removeEventListener('keydown', onKeyDown, false);
}
function search(element) {
var text = getLastWord(element);
var trigger = getTrigger(text, options.triggers);
destroy();
if (trigger !== null) {
fetchItems(trigger, text.substring(trigger.length), options.triggers[trigger]);
}
}
function getTrigger(text, triggers) {
for (var trigger in triggers) {
if (triggers.hasOwnProperty(trigger) && text.indexOf(trigger) === 0) {
return trigger;
}
}
return null;
}
function fetchItems(trigger, text, value) {
if (typeof value === 'string') {
KB.http.get(value).success(function (response) {
onItemFetched(trigger, text, response);
});
} else {
onItemFetched(trigger, text, value);
}
}
function onItemFetched(trigger, text, items) {
items = filterItems(text, items);
if (items.length > 0) {
renderMenu(buildItems(trigger, items));
}
}
function filterItems(text, items) {
var filteredItems = [];
if (text.length === 0) {
return items;
}
for (var i = 0; i < items.length; i++) {
if (items[i].value.toLowerCase().indexOf(text.toLowerCase()) === 0) {
filteredItems.push(items[i]);
}
}
return filteredItems;
}
function buildItems(trigger, items) {
var elements = [];
for (var i = 0; i < items.length; i++) {
var className = 'suggest-menu-item';
if (i === 0) {
className += ' active';
}
elements.push({
class: className,
html: items[i].html,
'data-value': items[i].value,
'data-trigger': trigger
});
}
return elements;
}
function renderMenu(items) {
var parentElement = getParentElement();
var caretPosition = getCaretCoordinates(containerElement, containerElement.selectionEnd);
var left = caretPosition.left + containerElement.offsetLeft;
var top = caretPosition.top + containerElement.offsetTop + 16;
document.addEventListener('keydown', onKeyDown, false);
var menu = KB.dom('ul')
.attr('id', 'suggest-menu')
.click(onClick)
.mouseover(onMouseOver)
.style('left', left + 'px')
.style('top', top + 'px')
.for('li', items)
.build();
parentElement.appendChild(menu);
}
this.render = function () {
containerElement.addEventListener('input', function () {
search(this);
});
};
});
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