这段代码工作得很完美但是我无法使用键盘上下键从建议列表中选择一个项目只能用鼠标选择是什么问题？
请帮助某人：/：/：/
https://jsfiddle.net/g60wc776/
/********************************************************************************
/*
* triggeredAutocomplete (jQuery UI autocomplete widget)
* 2012 by Hawkee.com (hawkee@gmail.com)
*
* Version 1.4.5
*
* Requires jQuery 1.7 and jQuery UI 1.8
*
* Dual licensed under MIT or GPLv2 licenses
* http://en.wikipedia.org/wiki/MIT_License
* http://en.wikipedia.org/wiki/GNU_General_Public_License
*
*/
;(function ( $, window, document, undefined ) {
$.widget("ui.triggeredAutocomplete", $.extend(true, {}, $.ui.autocomplete.prototype, {
options: {
trigger: "@",
allowDuplicates: true
},
_create:function() {
var self = this;
this.id_map = new Object();
this.stopIndex = -1;
this.stopLength = -1;
this.contents = '';
this.cursorPos = 0;
/** Fixes some events improperly handled by ui.autocomplete */
this.element.bind('keydown.autocomplete.fix', function (e) {
switch (e.keyCode) {
case $.ui.keyCode.ESCAPE:
self.close(e);
e.stopImmediatePropagation();
break;
case $.ui.keyCode.UP:
case $.ui.keyCode.DOWN:
if (!self.menu.element.is(":visible")) {
e.stopImmediatePropagation();
}
}
});
// Check for the id_map as an attribute. This is for editing.
var id_map_string = this.element.attr('id_map');
if(id_map_string) this.id_map = jQuery.parseJSON(id_map_string);
this.ac = $.ui.autocomplete.prototype;
this.ac._create.apply(this, arguments);
this.updateHidden();
// Select function defined via options.
this.options.select = function(event, ui) {
var contents = self.contents;
var cursorPos = self.cursorPos;
// Save everything following the cursor (in case they went back to add a mention)
// Separate everything before the cursor
// Remove the trigger and search
// Rebuild: start + result + end
var end = contents.substring(cursorPos, contents.length);
var start = contents.substring(0, cursorPos);
start = start.substring(0, start.lastIndexOf(self.options.trigger));
var top = self.element.scrollTop();
this.value = start + self.options.trigger+ui.item.label+' ' + end;
self.element.scrollTop(top);
// Create an id map so we can create a hidden version of this string with id's instead of labels.
self.id_map[ui.item.label] = ui.item.value;
self.updateHidden();
/** Places the caret right after the inserted item. */
var index = start.length + self.options.trigger.length + ui.item.label.length + 2;
if (this.createTextRange) {
var range = this.createTextRange();
range.move('character', index);
range.select();
} else if (this.setSelectionRange) {
this.setSelectionRange(index, index);
}
return false;
};
// Don't change the input as you browse the results.
this.options.focus = function(event, ui) { return false; }
this.menu.options.blur = function(event, ui) { return false; }
// Any changes made need to update the hidden field.
this.element.focus(function() { self.updateHidden(); });
this.element.change(function() { self.updateHidden(); });
},
// If there is an 'img' then show it beside the label.
_renderItem: function( ul, item ) {
if(item.img != undefined) {
return $( "<li></li>" )
.data( "item.autocomplete", item )
.append( "<a>" + "<img src='" + item.img + "' /><span>"+item.label+"</span></a>" )
.appendTo( ul );
}
else {
return $( "<li></li>" )
.data( "item.autocomplete", item )
.append( $( "<a></a>" ).text( item.label ) )
.appendTo( ul );
}
},
// This stops the input box from being cleared when traversing the menu.
_move: function( direction, event ) {
if ( !this.menu.element.is(":visible") ) {
this.search( null, event );
return;
}
if ( this.menu.first() && /^previous/.test(direction) ||
this.menu.last() && /^next/.test(direction) ) {
this.menu.deactivate();
return;
}
this.menu[ direction ]( event );
},
search: function(value, event) {
var contents = this.element.val();
var cursorPos = this.getCursor();
this.contents = contents;
this.cursorPos = cursorPos;
// Include the character before the trigger and check that the trigger is not in the middle of a word
// This avoids trying to match in the middle of email addresses when '@' is used as the trigger
var check_contents = contents.substring(contents.lastIndexOf(this.options.trigger) - 1, cursorPos);
var regex = new RegExp('\\B\\'+this.options.trigger+'([\\w\\-]+)');
if (contents.indexOf(this.options.trigger) >= 0 && check_contents.match(regex)) {
// Get the characters following the trigger and before the cursor position.
// Get the contents up to the cursortPos first then get the lastIndexOf the trigger to find the search term.
contents = contents.substring(0, cursorPos);
var term = contents.substring(contents.lastIndexOf(this.options.trigger) + 1, contents.length);
// Only query the server if we have a term and we haven't received a null response.
// First check the current query to see if it already returned a null response.
if(this.stopIndex == contents.lastIndexOf(this.options.trigger) && term.length > this.stopLength) { term = ''; }
if(term.length > 0) {
// Updates the hidden field to check if a name was removed so that we can put them back in the list.
this.updateHidden();
return this._search(term);
}
else this.close();
}
},
// Slightly altered the default ajax call to stop querying after the search produced no results.
// This is to prevent unnecessary querying.
_initSource: function() {
var self = this, array, url;
if ( $.isArray(this.options.source) ) {
array = this.options.source;
this.source = function( request, response ) {
response( $.ui.autocomplete.filter(array, request.term) );
};
} else if ( typeof this.options.source === "string" ) {
url = this.options.source;
this.source = function( request, response ) {
if ( self.xhr ) {
self.xhr.abort();
}
self.xhr = $.ajax({
url: url,
data: request,
dataType: 'json',
success: function(data) {
if(data != null) {
response($.map(data, function(item) {
if (typeof item === "string") {
label = item;
}
else {
label = item.label;
}
// If the item has already been selected don't re-include it.
if(!self.id_map[label] || self.options.allowDuplicates) {
return item
}
}));
self.stopLength = -1;
self.stopIndex = -1;
}
else {
// No results, record length of string and stop querying unless the length decreases
self.stopLength = request.term.length;
self.stopIndex = self.contents.lastIndexOf(self.options.trigger);
self.close();
}
}
});
};
} else {
this.source = this.options.source;
}
},
destroy: function() {
$.Widget.prototype.destroy.call(this);
},
// Gets the position of the cursor in the input box.
getCursor: function() {
var i = this.element[0];
if(i.selectionStart) {
return i.selectionStart;
}
else if(i.ownerDocument.selection) {
var range = i.ownerDocument.selection.createRange();
if(!range) return 0;
var textrange = i.createTextRange();
var textrange2 = textrange.duplicate();
textrange.moveToBookmark(range.getBookmark());
textrange2.setEndPoint('EndToStart', textrange);
return textrange2.text.length;
}
},
// Populates the hidden field with the contents of the entry box but with
// ID's instead of usernames. Better for storage.
updateHidden: function() {
var trigger = this.options.trigger;
var top = this.element.scrollTop();
var contents = this.element.val();
for(var key in this.id_map) {
var find = trigger+key;
find = find.replace(/[^a-zA-Z 0-9@]+/g,'\\$&');
var regex = new RegExp(find, "g");
var old_contents = contents;
contents = contents.replace(regex, trigger+'['+this.id_map[key]+']');
if(old_contents == contents) delete this.id_map[key];
}
$(this.options.hidden).val(contents);
this.element.scrollTop(top);
}
}));
})( jQuery, window , document );
$('#inputbox').triggeredAutocomplete({
hidden: '#hidden_inputbox',
source: [
"Asp",
"BASIC",
"COBOL",
"ColdFusion",
"Erlang",
"Fortran",
"Groovy",
"Java",
"JavaScript",
"Lisp",
"Perl",
"PHP",
"Python",
"Ruby",
"Scala",
"Scheme"
],
trigger: "@"
});<textarea id='inputbox' style='width: 400px; height: 90px;'></textarea>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>