source: main/trunk/model-sites-dev/von-sparql/js/combobox.js@ 28914

 $.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 autocomplete-custom 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" )
            .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();
                // Close if already visible
                if ( wasOpen ) {
                return;
                }
                // Pass empty string as value to search for, displaying all results
                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 ) {
        // Selected an item, nothing to do
        if ( ui.item ) {
        return;
        }
        // Search for a match (case-insensitive)
        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;
        }
        });
        // Found a match, nothing to do
        if ( valid ) {
        return;
        }
        // Remove invalid value
        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();
    }
});