jQuery UI的自动完成组合框非常慢有大的选择列表 [英] jQuery UI Autocomplete Combobox Very Slow With Large Select Lists
问题描述
我使用jQuery UI的自动完成组合框的改良版，因为在这里看到：
<一href=\"http://jqueryui.com/demos/autocomplete/#combobox\">http://jqueryui.com/demos/autocomplete/#combobox
I'm using a modified version of the jQuery UI Autocomplete Combobox, as seen here: http://jqueryui.com/demos/autocomplete/#combobox
的对于这个问题的缘故，让我们说我有正是code ^ ^ ^ 的
在，无论是通过点击按钮或聚焦于comboboxs文本输入打开下拉框，有展示的项目列表前的大型延迟。这种延迟获取时选择列表中有更多的选择明显要大。
When opening the combobox, either by clicking the button or focusing on the comboboxs text input, there is a large delay before showing the list of items. This delay gets noticeably larger when the select list has more options.
这延迟不只是发生在第一时间要么，它发生每一次。
This delay doesn't just occur the first time either, it happens every time.
由于一些在这个项目上的选择列表是非常大（成百上千的项目），延迟/浏览器凝固起来是不可接受的。
As some of the select lists on this project are very large (hundreds and hundreds of items), the delay/browser freezing up is unacceptable.
任何人都可以点我在正确的方向进行优化呢？甚至表现在哪里的问题可能是？
我认为问题可能与方式做脚本显示了项目的完整列表（不自动完成搜索空字符串），有另一种方式来显示所有项目？也许我可以建立用于显示所有（因为它是通用开始前输入打开列表）一次性的情况下，这并不做所有的正则表达式匹配？
I believe the issue may be to do with the way the script shows the full list of items (does an autocomplete search for an empty string), is there another way to display all items? Perhaps I could build a one off case for displaying all items (as it is common to open the list before starting to type) that doesn't do all the regex matching?
下面是一个的jsfiddle乱动：
http://jsfiddle.net/9TaMu/
Here is a jsfiddle to fiddle with: http://jsfiddle.net/9TaMu/
推荐答案
在当前的ComboBox实施的完整列表被清空并重新渲染每次展开下拉时间。你也被卡住了的minLength设置为0，因为它做一个空的搜索，获得的完整列表。
With the current combobox implementation, the full list is emptied and re-rendered every time you expand the dropdown. Also you are stuck with setting the minLength to 0, because it has to do an empty search to get the full list.
下面是我的延长自动完成构件自己的实现。在我的测试中，它可以处理5000项pretty名单顺利即使在IE 7和8呈现完整列表只有一次，并重新使用它只要单击下拉按钮。这也消除了选项的minLength = 0还与阵列的依赖，阿贾克斯列表来源。此外，如果有多个大型列表，则插件初始化被添加到队列中，以便它可以在后台运行，并且不冻结的浏览器。
Here is my own implementation extending the autocomplete widget. In my tests it can handle lists of 5000 items pretty smoothly even on IE 7 and 8. It renders the full list just once, and reuses it whenever the dropdown button is clicked. This also removes the dependence of the option minLength = 0. It also works with arrays, and ajax as list source. Also if you have multiple large list, the widget initialization is added to a queue so it can run in the background, and not freeze the browser.
<script>
(function($){
$.widget( "ui.combobox", $.ui.autocomplete,
{
options: {
/* override default values here */
minLength: 2,
/* the argument to pass to ajax to get the complete list */
ajaxGetAll: {get: "all"}
},
_create: function(){
if (this.element.is("SELECT")){
this._selectInit();
return;
}
$.ui.autocomplete.prototype._create.call(this);
var input = this.element;
input.addClass( "ui-widget ui-widget-content ui-corner-left" );
this.button = $( "<button type='button'> </button>" )
.attr( "tabIndex", -1 )
.attr( "title", "Show All Items" )
.insertAfter( input )
.button({
icons: { primary: "ui-icon-triangle-1-s" },
text: false
})
.removeClass( "ui-corner-all" )
.addClass( "ui-corner-right ui-button-icon" )
.click(function(event) {
// close if already visible
if ( input.combobox( "widget" ).is( ":visible" ) ) {
input.combobox( "close" );
return;
}
// when user clicks the show all button, we display the cached full menu
var data = input.data("combobox");
clearTimeout( data.closing );
if (!input.isFullMenu){
data._swapMenu();
input.isFullMenu = true;
}
/* input/select that are initially hidden (display=none, i.e. second level menus),
will not have position cordinates until they are visible. */
input.combobox( "widget" ).css( "display", "block" )
.position($.extend({ of: input },
data.options.position
));
input.focus();
data._trigger( "open" );
});
/* to better handle large lists, put in a queue and process sequentially */
$(document).queue(function(){
var data = input.data("combobox");
if ($.isArray(data.options.source)){
$.ui.combobox.prototype._renderFullMenu.call(data, data.options.source);
}else if (typeof data.options.source === "string") {
$.getJSON(data.options.source, data.options.ajaxGetAll , function(source){
$.ui.combobox.prototype._renderFullMenu.call(data, source);
});
}else {
$.ui.combobox.prototype._renderFullMenu.call(data, data.source());
}
});
},
/* initialize the full list of items, this menu will be reused whenever the user clicks the show all button */
_renderFullMenu: function(source){
var self = this,
input = this.element,
ul = input.data( "combobox" ).menu.element,
lis = [];
source = this._normalize(source);
input.data( "combobox" ).menuAll = input.data( "combobox" ).menu.element.clone(true).appendTo("body");
for(var i=0; i<source.length; i++){
lis[i] = "<li class=\"ui-menu-item\" role=\"menuitem\"><a class=\"ui-corner-all\" tabindex=\"-1\">"+source[i].label+"</a></li>";
}
ul.append(lis.join(""));
this._resizeMenu();
// setup the rest of the data, and event stuff
setTimeout(function(){
self._setupMenuItem.call(self, ul.children("li"), source );
}, 0);
input.isFullMenu = true;
},
/* incrementally setup the menu items, so the browser can remains responsive when processing thousands of items */
_setupMenuItem: function( items, source ){
var self = this,
itemsChunk = items.splice(0, 500),
sourceChunk = source.splice(0, 500);
for(var i=0; i<itemsChunk.length; i++){
$(itemsChunk[i])
.data( "item.autocomplete", sourceChunk[i])
.mouseenter(function( event ) {
self.menu.activate( event, $(this));
})
.mouseleave(function() {
self.menu.deactivate();
});
}
if (items.length > 0){
setTimeout(function(){
self._setupMenuItem.call(self, items, source );
}, 0);
}else { // renderFullMenu for the next combobox.
$(document).dequeue();
}
},
/* overwrite. make the matching string bold */
_renderItem: function( ul, item ) {
var label = item.label.replace( new RegExp(
"(?![^&;]+;)(?!<[^<>]*)(" + $.ui.autocomplete.escapeRegex(this.term) +
")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>" );
return $( "<li></li>" )
.data( "item.autocomplete", item )
.append( "<a>" + label + "</a>" )
.appendTo( ul );
},
/* overwrite. to cleanup additional stuff that was added */
destroy: function() {
if (this.element.is("SELECT")){
this.input.remove();
this.element.removeData().show();
return;
}
// super()
$.ui.autocomplete.prototype.destroy.call(this);
// clean up new stuff
this.element.removeClass( "ui-widget ui-widget-content ui-corner-left" );
this.button.remove();
},
/* overwrite. to swap out and preserve the full menu */
search: function( value, event){
var input = this.element;
if (input.isFullMenu){
this._swapMenu();
input.isFullMenu = false;
}
// super()
$.ui.autocomplete.prototype.search.call(this, value, event);
},
_change: function( event ){
abc = this;
if ( !this.selectedItem ) {
var matcher = new RegExp( "^" + $.ui.autocomplete.escapeRegex( this.element.val() ) + "$", "i" ),
match = $.grep( this.options.source, function(value) {
return matcher.test( value.label );
});
if (match.length){
match[0].option.selected = true;
}else {
// remove invalid value, as it didn't match anything
this.element.val( "" );
if (this.options.selectElement) {
this.options.selectElement.val( "" );
}
}
}
// super()
$.ui.autocomplete.prototype._change.call(this, event);
},
_swapMenu: function(){
var input = this.element,
data = input.data("combobox"),
tmp = data.menuAll;
data.menuAll = data.menu.element.hide();
data.menu.element = tmp;
},
/* build the source array from the options of the select element */
_selectInit: function(){
var select = this.element.hide(),
selected = select.children( ":selected" ),
value = selected.val() ? selected.text() : "";
this.options.source = select.children( "option[value!='']" ).map(function() {
return { label: $.trim(this.text), option: this };
}).toArray();
var userSelectCallback = this.options.select;
var userSelectedCallback = this.options.selected;
this.options.select = function(event, ui){
ui.item.option.selected = true;
if (userSelectCallback) userSelectCallback(event, ui);
// compatibility with jQuery UI's combobox.
if (userSelectedCallback) userSelectedCallback(event, ui);
};
this.options.selectElement = select;
this.input = $( "<input>" ).insertAfter( select )
.val( value ).combobox(this.options);
}
}
);
})(jQuery);
</script>
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