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// http://svn.apache.org/repos/asf/couchdb/trunk/share/www/script/jquery.suggest.js
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
(function($) {
function suggest(elem, options) {
var timer = null;
var prevVal = null;
var cache = {};
var cacheKeys = [];
var input = $(elem).attr("autocomplete", "off");
var dropdown = $('<ul style="display: none; position: absolute; z-index: 10000"></ul>')
.addClass(options.dropdownClass).appendTo(document.body);
input
.blur(function() {
if (timer) clearTimeout(timer);
setTimeout(function() { dropdown.hide() }, 200);
})
.keydown(function(e) {
if ($.inArray(e.keyCode, [16, 17, 18, 20, 144, 91, 93, 224]) != -1) {
return; // ignore modifier keys
}
if (timer) clearTimeout(timer);
if ($.inArray(e.keyCode, [38, 40]) != -1 ||
(dropdown.is(":visible") && (e.keyCode == 27 ||
($.inArray(e.keyCode, [9, 13]) != -1 && getSelection())))) {
switch(e.keyCode) {
case 38: // up
moveUp();
break;
case 40: // down
moveDown();
break;
case 9: // tab
case 13: // return
commit();
if (e.keyCode == 9) return true;
break;
case 27: // escape
dropdown.hide();
break;
}
e.preventDefault(); e.stopPropagation();
return false;
} else {
timer = setTimeout(function() { suggest() }, options.delay);
}
});
function suggest(force) {
var newVal = $.trim(input.val());
if (force || newVal != prevVal) {
if (force || newVal.length >= options.minChars) {
if (options.cache && cache.hasOwnProperty(newVal)) {
show(cache[newVal].items, cache[newVal].render);
} else {
options.callback.apply(elem, [newVal, function(items, render) {
if (options.cache) {
if (cacheKeys.length >= options.cacheLimit) {
delete cache[cacheKeys.shift()];
}
cache[newVal] = {items: items, render: render};
cacheKeys.push(newVal);
}
show(items, render);
}]);
}
} else {
dropdown.hide();
}
prevVal = newVal;
}
}
function show(items, render) {
if (!items) return;
if (!items.length) { dropdown.hide(); return; }
var offset = input.offset();
dropdown.empty().css({
top: (offset.top + input.outerHeight()) + "px", left: offset.left + "px",
minWidth: input.css("width")
});
render = render || function(idx, value) { return value; }
for (var i = 0; i < items.length; i++) {
var item = $("<li></li>").data("value", items[i]);
var rendered = render(i, items[i]);
if (typeof(rendered) == "string") {
item.text(rendered);
} else {
item.append(rendered);
}
item.appendTo(dropdown);
}
dropdown.slideDown("fast");
dropdown.children("li").click(function(e) {
$(this).addClass("selected");
commit();
});
}
function commit() {
var sel = getSelection();
if (sel) {
prevVal = sel.data("value");
input.val(prevVal);
if (options.select) {
options.select.apply(elem, [prevVal]);
}
dropdown.hide();
}
if (timer) clearTimeout(timer)
}
function getSelection() {
if (!dropdown.is(":visible")) return null;
var sel = dropdown.children("li.selected");
return sel.length ? sel : null;
}
function moveDown() {
if (!dropdown.is(":visible")) suggest(true);
var sel = getSelection();
if (sel) sel.removeClass("selected").next().addClass("selected");
else dropdown.children("li:first-child").addClass("selected");
}
function moveUp() {
if (!dropdown.is(":visible")) suggest(true);
var sel = getSelection();
if (sel) sel.removeClass("selected").prev().addClass("selected");
else dropdown.children("li:last-child").addClass("selected");
}
}
$.fn.suggest = function(callback, options) {
options = $.extend({
cache: true,
cacheLimit: 10,
callback: callback,
delay: 250,
dropdownClass: "suggest-dropdown",
minChars: 1,
select: null
}, options || {});
return this.each(function() {
suggest(this, options);
});
};
})(jQuery);
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