php - 有Jquery-UI自动完成问题

Question

我的combobox:遇到2个问题

首先，我在以下脚本中添加了input.val( $("#parent option:selected").text());这一行，以将默认文本设置为Jquery UI组合框。

问题是我想删除此文本onclick（类似html5占位符，但我需要跨浏览器支持）。如何修改下面的代码来解决该问题？

(function( $ ) {
    $.widget( "ui.combobox", {
        _create: function() {
            var self = this,
                select = this.element.hide(),
                selected = select.children( ":selected" ),
                value = selected.val() ? selected.text() : "";
            var input = this.input = $( "<input>" )
                .insertAfter( select )
                .val( value )
                .autocomplete({
                    delay: 0,
                    minLength: 0,
                    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.val( $("#parent option:selected").text());
            input.data( "autocomplete" )._renderItem = function( ul, item ) {
                return $( "<li></li>" )
                    .data( "item.autocomplete", item )
                    .append( "<a>" + item.label + "</a>" )
                    .appendTo( ul );
            };

            this.button = $( "<button type='button'>&nbsp;</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() {
                    // 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.input.remove();
            this.button.remove();
            this.element.show();
            $.Widget.prototype.destroy.call( this );
        }
    });
})( jQuery );

其次，借助以下PHP函数，从MySQL表生成选项。如您所见，它基于父子结构生成选择框选项。但是在实现了jQuery ui组合框后，选项的背景颜色不会改变。如何解决这个问题？

<?php
$db = new MySQLi('localhost', 'user', 'pass', 'db') or die($db->error);
$db->set_charset('utf8');

if(isSet($_POST['menu'])) {
$menu = $db->escape_string($_POST['menu']);
if($menu!=0){
    if(generateOptions(0,0, 0, $menu, $db))
    echo '<option value="" selected="selected">Birini seçin...</option>'.generateOptions(0,0, 0, $menu, $db);
    else echo '';
}
else echo '';
}

function generateOptions($parent, $level, $padding, $menu, $db)
{
    $result=$db->query("SELECT id, name FROM menu WHERE parent='$parent' AND showinmenu='$menu'");
    $spacer = '&nbsp;&nbsp;'; 
    $padding = str_repeat($spacer, $level);
    $html = "";
    while($data=$result->fetch_row()){      
        $children_html = generateOptions($data[0], $level+1, $padding, $menu,$db);
        $optstyle = empty($children_html) ? 'std' : 'bold';
        $html .= generateOption($optstyle.'option', $level, $data, $padding);
        $html .= $children_html;
    }
    return $html;
}

function generateOption($type, $level, $data, $padding){
    $bgcolor=array('0'=>'#f66e02','1'=>'#FF9C4D', '2'=>'#FF9C4D');
    $fontcolor=array('0'=>'#fff','1'=>'#000', '2'=>'#000');
    switch($type){
    case 'boldoption': return '<option class="bold" style="background-color:'.$bgcolor[$level].'; color:'.$fontcolor[$level].'" value="'.$data[0].'">'.$padding.$data[1]."</option>\n"; break;
    case 'stdoption': return '<option class="std"  value="'.$data[0].'">'.$padding.$data[1]."</option>\n"; break;
    }
}
?>

Answer 1

要获得跨浏览器输入占位符的支持，可以查看以下文章：http://albertoconnor.ca/blog/2011/Aug/21/jquery-fallback-html5-placeholder-attribute