JQuery UI之Autocomplete(4)多值输入、远程缓存与组合框

<link href="../css/jquery-ui.css" rel="stylesheet" />
<script type="text/javascript" src="../js/jquery-1.9.1.min.js" ></script>
<script type="text/javascript" src="../js/jquery-ui.js"  ></script>
<script type="text/javascript" src="../js/index.js"  ></script>

 <label for="language">搜索：</lable>
<input id="language" name="language" type="text">

var availableTags = ["ActionScript","AppleScript","Asp","BASIC","C","C++", "Clojure" ];
    function split( val ) {
        return val.split( /,\s*/ );
    }
    function extractLast( term ) {
        return split( term ).pop();
    }

    $( "#language" )
    // 当选择一个条目时不离开文本域
    .bind( "keydown", function( event ) {
        if ( event.keyCode === $.ui.keyCode.TAB &&
                $( this ).data( "ui-autocomplete" ).menu.active ) {
            event.preventDefault();
        }
    })
    .autocomplete({
        minLength: 0,
        //本地数据
        /*    source: function( request, response ) {
            // 回到 autocomplete，但是提取最后的条目
            response( $.ui.autocomplete.filter(
                    availableTags, extractLast( request.term ) ) );
        },*/
        //远程数据
        source: function( request, response ) {
            $.getJSON( "/Autocomplete.html", {
                term: extractLast( request.term )
            }, response );
        },
        search: function() {
            // 自定义最小长度
            var term = extractLast( this.value );
            if ( term.length < 1 ) {
                return false;
            }
        },
        focus: function() {
            // 防止在获得焦点时插入值
            return false;
        },
        select: function( event, ui ) {
            var terms = split( this.value );
            // 移除当前输入
            terms.pop();
            // 添加被选项
            terms.push( ui.item.value );
            // 添加占位符，在结尾添加逗号+空格
            terms.push( "" );
            this.value = terms.join( ", " );
            return false;
        }
    });

   //为了提高性能，这里添加了一些本地缓存
    var cache = {};
    $( "#language" ).autocomplete({
        minLength: 0,
        source: function( request, response ) {
            var term = request.term;
            if ( term in cache ) {
                response( cache[ term ] );
                return;
            }

            $.getJSON(  "/Autocomplete.html", request, function( data, status, xhr ) {
                console.log(status);

                cache[ term ] = data;
                response( data );
            });
        }
    });

<div class="ui-widget">
    <label>您喜欢的编程语言：</label> <select id="combobox">
        <option value="">请选择...</option>
        <option value="ActionScript">ActionScript</option>
        <option value="AppleScript">AppleScript</option>
        <option value="Asp">Asp</option>
        <option value="BASIC">BASIC</option>
        <option value="C">C</option>
        <option value="C++">C++</option>
        <option value="Clojure">Clojure</option>
        <option value="COBOL">COBOL</option>
        <option value="ColdFusion">ColdFusion</option>
        <option value="Erlang">Erlang</option>
        <option value="Fortran">Fortran</option>
        <option value="Groovy">Groovy</option>
        <option value="Haskell">Haskell</option>
        <option value="Java">Java</option>
        <option value="JavaScript">JavaScript</option>
        <option value="Lisp">Lisp</option>
        <option value="Perl">Perl</option>
        <option value="PHP">PHP</option>
        <option value="Python">Python</option>
        <option value="Ruby">Ruby</option>
        <option value="Scala">Scala</option>
        <option value="Scheme">Scheme</option>
    </select>
</div>

  (function( $ ) {
    $.widget( "custom.combobox", {
      _create: function() {
        this.wrapper = $( "<span>" )
          .addClass( "custom-combobox" )
          .insertAfter( this.element );
 
        this.element.hide();
        this._createAutocomplete();
        this._createShowAllButton();
      },
 
      _createAutocomplete: function() {
        var selected = this.element.children( ":selected" ),
          value = selected.val() ? selected.text() : "";
 
        this.input = $( "<input>" )
          .appendTo( this.wrapper )
          .val( value )
          .attr( "title", "" )
          .addClass( "custom-combobox-input ui-widget ui-widget-content ui-state-default ui-corner-left" )
          .autocomplete({
            delay: 0,
            minLength: 0,
            source: $.proxy( this, "_source" )
          })
          .tooltip({
            tooltipClass: "ui-state-highlight"
          });
 
        this._on( this.input, {
          autocompleteselect: function( event, ui ) {
            ui.item.option.selected = true;
            this._trigger( "select", event, {
              item: ui.item.option
            });
          },
 
          autocompletechange: "_removeIfInvalid"
        });
      },
 
      _createShowAllButton: function() {
        var input = this.input,
          wasOpen = false;
 
        $( "<a>" )
          .attr( "tabIndex", -1 )
          .attr( "title", "Show All Items" )
          .tooltip()
          .appendTo( this.wrapper )
          .button({
            icons: {
              primary: "ui-icon-triangle-1-s"
            },
            text: false
          })
          .removeClass( "ui-corner-all" )
          .addClass( "custom-combobox-toggle ui-corner-right" )
          .mousedown(function() {
            wasOpen = input.autocomplete( "widget" ).is( ":visible" );
          })
          .click(function() {
            input.focus();
 
            // 如果已经可见则关闭
            if ( wasOpen ) {
              return;
            }
 
            // 传递空字符串作为搜索的值，显示所有的结果
            input.autocomplete( "search", "" );
          });
      },
 
      _source: function( request, response ) {
        var matcher = new RegExp( $.ui.autocomplete.escapeRegex(request.term), "i" );
        response( this.element.children( "option" ).map(function() {
          var text = $( this ).text();
          if ( this.value && ( !request.term || matcher.test(text) ) )
            return {
              label: text,
              value: text,
              option: this
            };
        }) );
      },
 
      _removeIfInvalid: function( event, ui ) {
 
        // 选择一项，不执行其他动作
        if ( ui.item ) {
          return;
        }
 
        // 搜索一个匹配（不区分大小写）
        var value = this.input.val(),
          valueLowerCase = value.toLowerCase(),
          valid = false;
        this.element.children( "option" ).each(function() {
          if ( $( this ).text().toLowerCase() === valueLowerCase ) {
            this.selected = valid = true;
            return false;
          }
        });
 
        // 找到一个匹配，不执行其他动作
        if ( valid ) {
          return;
        }
 
        // 移除无效的值
        this.input
          .val( "" )
          .attr( "title", value + " didn‘t match any item" )
          .tooltip( "open" );
        this.element.val( "" );
        this._delay(function() {
          this.input.tooltip( "close" ).attr( "title", "" );
        }, 2500 );
        this.input.data( "ui-autocomplete" ).term = "";
      },
 
      _destroy: function() {
        this.wrapper.remove();
        this.element.show();
      }
    });
  })( jQuery );
 
  $(function() {
    $( "#combobox" ).combobox();
  });

$("#language").autocomplete({
        source: [ ‘Chinese‘,‘English‘,‘Spanish‘,‘Russian‘,‘French‘,‘Japanese‘,‘Korean‘,‘German‘]，
         minLength : 0
    }).focus(function(){
        $(this).data("autocomplete").search($(this).val()); 
    });