javascript - 如何为单个元素的 jQuery 组合框设置 minLength

Question

如何在不影响其他元素的情况下为单个元素设置 minLength

编辑:

插件代码如下

(function ( $ ) {
        $.widget( "ui.combobox", {
            _create: function() {
                var input,
                    self = this,
                    select = this.element.hide(),
                    selected = select.children( ":selected" ),
                    value = selected.val() ? selected.text() : "",
                    wrapper = this.wrapper = $( "<span>" )
                        .addClass( "ui-combobox" )
                        .insertAfter( select );

                input = $( "<input>" )
                    .appendTo( wrapper )
                    .val( value )
                    .addClass( "ui-state-default ui-combobox-input" )
                    .autocomplete({
                        delay: 300,
                        minLength: 2,
                        source: function( request, response ) {
                            var matcher = new RegExp( $.ui.autocomplete.escapeRegex(request.term), "i" );
                            response( select.children( "option" ).map(function() {
                                var text = $( this ).text();
                                if ( this.value && ( !request.term || matcher.test(text) ) )
                                    return {
                                        label: text.replace(
                                            new RegExp(
                                                "(?![^&;]+;)(?!<[^<>]*)(" +
                                                $.ui.autocomplete.escapeRegex(request.term) +
                                                ")(?![^<>]*>)(?![^&;]+;)", "gi"
                                            ), "<strong>$1</strong>" ),
                                        value: text,
                                        option: this
                                    };
                            }) );
                        },
                        select: function( event, ui ) {
                            ui.item.option.selected = true;
                            self._trigger( "selected", event, {
                                item: ui.item.option
                            });
                        },
                        change: function( event, ui ) {
                            if ( !ui.item ) {
                                var matcher = new RegExp( "^" + $.ui.autocomplete.escapeRegex( $(this).val() ) + "$", "i" ),
                                    valid = false;
                                select.children( "option" ).each(function() {
                                    if ( $( this ).text().match( matcher ) ) {
                                        this.selected = valid = true;
                                        return false;
                                    }
                                });
                                if ( !valid ) {
                                    // remove invalid value, as it didn't match anything
                                    $( this ).val( "" );
                                    select.val( "" );
                                    input.data( "autocomplete" ).term = "";
                                    return false;
                                }
                            }
                        }
                    })
                    .addClass( "ui-widget ui-widget-content ui-corner-left" );

                input.data( "autocomplete" )._renderItem = function( ul, item ) {
                    return $( "<li></li>" )
                        .data( "item.autocomplete", item )
                        .append( "<a>" + item.label + "</a>" )
                        .appendTo( ul );
                };

                $( "<a>" )
                    .attr( "tabIndex", -1 )
                    .attr( "title", "Show All Items" )
                    .appendTo( wrapper )
                    .button({
                        icons: {
                            primary: "ui-icon-triangle-1-s"
                        },
                        text: false
                    })
                    .removeClass( "ui-corner-all" )
                    .addClass( "ui-corner-right ui-combobox-toggle" )
                    .click(function() {
                        // close if already visible
                        if ( input.autocomplete( "widget" ).is( ":visible" ) ) {
                            input.autocomplete( "close" );
                            return;
                        }

                        // work around a bug (likely same cause as #5265)
                        $( this ).blur();

                        // pass empty string as value to search for, displaying all results
                        input.autocomplete( "search", "" );
                        input.focus();
                    });
            },

            destroy: function() {
                this.wrapper.remove();
                this.element.show();
                $.Widget.prototype.destroy.call( this );
            }
        });
    })( jQuery );

我正在选择必须将哪些选择标签制作成这样的组合框。

$("#tracklisting").combobox({
    selected: function(event, ui) {
        var tracklisting = $("#tracklisting").val();
        var id = $("#id").val();

        $.post('writeToDB.php', {
            id: id,
            tracklisting: tracklisting
        });
    }
})

我在哪里放置 $("#tracklisting").autocomplete( "option", "minLength", 0 ); 来设置长度。我尝试了多种方法但无济于事。

编辑:这是该项目的 jsfiddle 链接。组合框可以保留默认值，但组合框 2 的最小长度必须为 0。http://jsfiddle.net/5cMjk/4/

Answer 1

jQuery UI 中的 .combobox() 小部件是 .autocomplete() 的修改版，似乎没有那么多选项。

但是从它的代码中你可以注意到它动态地创建了一个输入标签，你可以尝试再次在它上面重新应用 .autocomplete() 方法。输入被放置在旧选择标签之后的范围内，我使用 .next() 来选择范围:

var myMinLength = 10;
$("#tracklisting").next().children("input").autocomplete({
                    delay: 0,

                    minLength: myMinLength ,

                    source: function( request, response ) {
                        var matcher = new RegExp( $.ui.autocomplete.escapeRegex(request.term), "i" );
                        response( select.children( "option" ).map(function() {
                            var text = $( this ).text();
                            if ( this.value && ( !request.term || matcher.test(text) ) )
                                return {
                                    label: text.replace(
                                        new RegExp(
                                            "(?![^&;]+;)(?!<[^<>]*)(" +
                                            $.ui.autocomplete.escapeRegex(request.term) +
                                            ")(?![^<>]*>)(?![^&;]+;)", "gi"
                                        ), "<strong>$1</strong>" ),
                                    value: text,
                                    option: this
                                };
                        }) );
                    },
                    select: function( event, ui ) {
                        ui.item.option.selected = true;
                        self._trigger( "selected", event, {
                            item: ui.item.option
                        });
                    },
                    change: function( event, ui ) {
                        if ( !ui.item ) {
                            var matcher = new RegExp( "^" + $.ui.autocomplete.escapeRegex( $(this).val() ) + "$", "i" ),
                                valid = false;
                            select.children( "option" ).each(function() {
                                if ( $( this ).text().match( matcher ) ) {
                                    this.selected = valid = true;
                                    return false;
                                }
                            });
                            if ( !valid ) {
                                // remove invalid value, as it didn't match anything
                                $( this ).val( "" );
                                select.val( "" );
                                input.data( "autocomplete" ).term = "";
                                return false;
                            }
                        }
                    }
                })

如果您的组合框在此之后中断，您还可以尝试添加以下行:

$("#tracklisting").next().children("input").addClass( "ui-widget ui-widget-content ui-corner-left" );

            $("#tracklisting").next().children("input").data( "autocomplete" )._renderItem = function( ul, item ) {
                return $( "<li></li>" )
                    .data( "item.autocomplete", item )
                    .append( "<a>" + item.label + "</a>" )
                    .appendTo( ul );
            };