Created
January 6, 2012 22:53
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(function($) { | |
// Make jQuery's :contains case insensitive (like HTML5 datalist) | |
// Changed the name to prevent overriding original functionality | |
$.expr[':'].RD_contains = function(a, i, m) { | |
return $(a).text().toUpperCase().indexOf(m[3].toUpperCase()) >= 0; | |
}; | |
$.fn.relevantDropdown = function(options) { | |
options = $.extend({ | |
fadeOutSpeed: 'normal', // speed to fade out the dataList Popup | |
change: null | |
}, options); | |
return this.each(function() { | |
var $input = $(this), | |
list_id = $input.attr('list'), | |
$datalist = $("#" + list_id), | |
datalistItems = $datalist.find("option"), | |
searchPosition, | |
scrollValue = 0; | |
// Insert home for new fake datalist | |
$("<ul />", { | |
"class": "datalist", | |
"id" : list_id | |
}).appendTo("body"); | |
// Remove old datalist | |
$datalist.remove(); | |
// Update pointer | |
var $datalist = $("#" + list_id); | |
// Fill new fake datalist | |
datalistItems.each(function() { | |
$("<li />", { | |
// .val is required here, not .text or .html | |
// HTML *needs* to be <option value="xxx"> not <option>xxx</option> (IE) | |
"text": $(this).val() | |
}).appendTo($datalist); | |
}); | |
// Update pointer | |
datalistItems = $datalist.find("li"); | |
// Typey type type | |
$input | |
.on("focus", function() { | |
// Reset scroll | |
$datalist.scrollTop(0); | |
scrollValue = 0; | |
}) | |
.on("blur", function() { | |
// If this fires immediately, it prevents click-to-select from working | |
datainterval = setInterval(function() { | |
if (!$datalist.hasClass('activelist')) { | |
$datalist.fadeOut(options.fadeOutSpeed); | |
datalistItems.removeClass("active"); | |
clearInterval(datainterval); | |
} | |
}, 500); | |
}) | |
.on("keyup focus", function(e) { | |
searchPosition = $input.position(); | |
// Build datalist | |
$datalist | |
.show() | |
.css({ | |
top: searchPosition.top + $(this).outerHeight(), | |
left: searchPosition.left, | |
width: $input.outerWidth() | |
}) | |
.on("mouseenter", function() { | |
$(this).addClass('activelist'); | |
}) | |
.on("mouseleave", function() { | |
$(this).removeClass('activelist'); | |
}); | |
datalistItems.hide(); | |
$datalist.find("li:RD_contains('" + $input.val() + "')").show(); | |
}); | |
// Don't want to use :hover in CSS so doing this instead | |
// really helps with arrow key navigation | |
datalistItems | |
.on("mouseenter", function() { | |
$(this).addClass("active").siblings().removeClass("active"); | |
}) | |
.on("mouseleave", function() { | |
$(this).removeClass("active"); | |
}); | |
// Window resize | |
$(window).resize(function() { | |
searchPosition = $input.position(); | |
$datalist | |
.css({ | |
top: searchPosition.top + $(this).outerHeight(), | |
left: searchPosition.left, | |
width: $input.outerWidth() | |
}); | |
}); | |
// Watch arrow keys for up and down | |
$input.on("keydown", function(e) { | |
var active = $("li.active"), | |
datalistHeight = $datalist.outerHeight(), | |
datalistItemsHeight = datalistItems.outerHeight(); | |
// up arrow | |
if ( e.keyCode == 38 ) { | |
if (active.length) { | |
prevAll = active.prevAll("li:visible"); | |
if (prevAll.length > 0) { | |
active.removeClass("active"); | |
prevAll.eq(0).addClass("active"); | |
} | |
if ( prevAll.length && prevAll.position().top < 0 && scrollValue > 0 ){ | |
$datalist.scrollTop(scrollValue-=datalistItemsHeight); | |
} | |
} | |
} | |
// down arrow | |
if ( e.keyCode == 40 ) { | |
if (active.length) { | |
var nextAll = active.nextAll("li:visible"); | |
if (nextAll.length > 0) { | |
active.removeClass("active"); | |
nextAll.eq(0).addClass("active"); | |
} | |
if ( nextAll.length && (nextAll.position().top + datalistItemsHeight) >= datalistHeight ){ | |
$datalist.stop().animate({ | |
scrollTop: scrollValue += datalistItemsHeight | |
}, 200); | |
} | |
} else { | |
datalistItems.removeClass("active"); | |
$datalist.find("li:visible:first").addClass("active"); | |
} | |
} | |
// return or tab key | |
if ( e.keyCode == 13 || e.keyCode == 9 ){ | |
if (active.length) { | |
$input.val(active.text()); | |
item_selected(active.text()); | |
} | |
$datalist.fadeOut(options.fadeOutSpeed); | |
datalistItems.removeClass("active"); | |
} | |
// keys | |
if ( e.keyCode != 13 && e.keyCode != 38 && e.keyCode != 40 ){ | |
// Reset active class | |
datalistItems.removeClass("active"); | |
$datalist.find("li:visible:first").addClass("active"); | |
// Reset scroll | |
$datalist.scrollTop(0); | |
scrollValue = 0; | |
} | |
}); | |
// When choosing from dropdown | |
datalistItems.on("click", function() { | |
var active = $("li.active"); | |
if (active.length) { | |
$input.val($(this).text()); | |
} | |
$datalist.fadeOut(options.fadeOutSpeed); | |
datalistItems.removeClass("active"); | |
item_selected($(this).text()); | |
}); | |
function item_selected(new_text) { | |
if( typeof options.change === 'function' ) | |
options.change.call(this, new_text); | |
} | |
}); | |
}; | |
})(jQuery); |
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