向jqueryui滑块添加填充

既然你现在问了,我就坐下来黑了jqueryui的滑块,按你的要求添加了填充选项。

注意:我只为带有一个手柄的水平滑块添加了它。其他的案子并不复杂。我只是没有动力去做打字和随后的测试来覆盖那些现在可能不需要的案例。

在包含jqueryui中的原始滑动条之后包含此代码。扩展覆盖了几个方法,并将选项“paddingMin”和“paddingMax”添加到Slider小部件中(值必须是数字,并且将被解释为像素;显然,这也可以很容易地扩展到使用其他单位,但同样意味着对当前未请求的情况进行更多的键入/测试)。

简单示例用法:

$('#slider').slider({ paddingMin: 50, paddingMax: 100 });

扩展黑客代码(按原样提供,不要起诉我):

(
    function($, undefined)
    {
        $.ui.slider.prototype.options =
            $.extend(
                {},
                $.ui.slider.prototype.options,
                {
                    paddingMin: 0,
                    paddingMax: 0
                }
            );

        $.ui.slider.prototype._refreshValue =
            function() {
                var
                    oRange = this.options.range,
                    o = this.options,
                    self = this,
                    animate = ( !this._animateOff ) ? o.animate : false,
                    valPercent,
                    _set = {},
                    elementWidth,
                    elementHeight,
                    paddingMinPercent,
                    paddingMaxPercent,
                    paddedBarPercent,
                    lastValPercent,
                    value,
                    valueMin,
                    valueMax;

                if (self.orientation === "horizontal")
                {
                    elementWidth = this.element.outerWidth();
                    paddingMinPercent = o.paddingMin * 100 / elementWidth;
                    paddedBarPercent = ( elementWidth - ( o.paddingMin + o.paddingMax) ) * 100 / elementWidth;
                }
                else
                {
                    elementHeight = this.element.outerHeight();
                    paddingMinPercent = o.paddingMin * 100 / elementHeight;
                    paddedBarPercent = ( elementHeight - ( o.paddingMin + o.paddingMax) ) * 100 / elementHeight;
                }

                if ( this.options.values && this.options.values.length ) {
                    this.handles.each(function( i, j ) {
                        valPercent =
                            ( ( self.values(i) - self._valueMin() ) / ( self._valueMax() - self._valueMin() ) * 100 )
                            * paddedBarPercent / 100 + paddingMinPercent;
                        _set[ self.orientation === "horizontal" ? "left" : "bottom" ] = valPercent + "%";
                        $( this ).stop( 1, 1 )[ animate ? "animate" : "css" ]( _set, o.animate );
                        if ( self.options.range === true ) {
                            if ( self.orientation === "horizontal" ) {
                                if ( i === 0 ) {
                                    self.range.stop( 1, 1 )[ animate ? "animate" : "css" ]( { left: valPercent + "%" }, o.animate );
                                }
                                if ( i === 1 ) {
                                    self.range[ animate ? "animate" : "css" ]( { width: ( valPercent - lastValPercent ) + "%" }, { queue: false, duration: o.animate } );
                                }
                            } else {
                                if ( i === 0 ) {
                                    self.range.stop( 1, 1 )[ animate ? "animate" : "css" ]( { bottom: ( valPercent ) + "%" }, o.animate );
                                }
                                if ( i === 1 ) {
                                    self.range[ animate ? "animate" : "css" ]( { height: ( valPercent - lastValPercent ) + "%" }, { queue: false, duration: o.animate } );
                                }
                            }
                        }
                        lastValPercent = valPercent;
                    });
                } else {
                    value = this.value();
                    valueMin = this._valueMin();
                    valueMax = this._valueMax();
                    valPercent =
                        ( ( valueMax !== valueMin )
                        ? ( value - valueMin ) / ( valueMax - valueMin ) * 100
                        : 0 )
                        * paddedBarPercent / 100 + paddingMinPercent;

                    _set[ self.orientation === "horizontal" ? "left" : "bottom" ] = valPercent + "%";

                    this.handle.stop( 1, 1 )[ animate ? "animate" : "css" ]( _set, o.animate );

                    if ( oRange === "min" && this.orientation === "horizontal" ) {
                        this.range.stop( 1, 1 )[ animate ? "animate" : "css" ]( { width: valPercent + "%" }, o.animate );
                    }
                    if ( oRange === "max" && this.orientation === "horizontal" ) {
                        this.range[ animate ? "animate" : "css" ]( { width: ( 100 - valPercent ) + "%" }, { queue: false, duration: o.animate } );
                    }
                    if ( oRange === "min" && this.orientation === "vertical" ) {
                        this.range.stop( 1, 1 )[ animate ? "animate" : "css" ]( { height: valPercent + "%" }, o.animate );
                    }
                    if ( oRange === "max" && this.orientation === "vertical" ) {
                        this.range[ animate ? "animate" : "css" ]( { height: ( 100 - valPercent ) + "%" }, { queue: false, duration: o.animate } );
                    }
                }
            };

        $.ui.slider.prototype._normValueFromMouse =
            function( position ) {
                var
                    o = this.options,
                    pixelTotal,
                    pixelMouse,
                    percentMouse,
                    valueTotal,
                    valueMouse;

                if ( this.orientation === "horizontal" ) {
                    pixelTotal = this.elementSize.width - (o.paddingMin + o.paddingMax);
                    pixelMouse = position.x - this.elementOffset.left - o.paddingMin - ( this._clickOffset ? this._clickOffset.left : 0 );
                } else {
                    pixelTotal = this.elementSize.height - (o.paddingMin + o.paddingMax);
                    pixelMouse = position.y - this.elementOffset.top - o.paddingMin - ( this._clickOffset ? this._clickOffset.top : 0 );
                }

                percentMouse = ( pixelMouse / pixelTotal );
                if ( percentMouse > 1 ) {
                    percentMouse = 1;
                }
                if ( percentMouse < 0 ) {
                    percentMouse = 0;
                }
                if ( this.orientation === "vertical" ) {
                    percentMouse = 1 - percentMouse;
                }

                valueTotal = this._valueMax() - this._valueMin();
                valueMouse = this._valueMin() + percentMouse * valueTotal;

                return this._trimAlignValue( valueMouse );
            };
    }
)(jQuery);

“捕捉到增量”加上“不兼容”(捕捉值不均匀)最小值和最大值是否会产生预期效果?我知道这很可能会导致应用程序端的值转换,因为这可能无法使用现在使用的值来获得,但这里有一个“hack and slash”解决方案,如果它有效的话。

我的建议是把最小值设为,比如说,750。将“值”捕捉为1200,“最大值”捕捉为4050。这样,最低捕捉比最小值高450,滑块永远不会到达最左边的边。与最大值相同,即3x1200+450=4050。此处使用的值是任意的,仅限于示例。

我还没有测试过这个,也不知道它是否有效,我知道这不是你想要的,只是我在查看jqueryuislider如何工作的示例时想到的一个想法jqueryui.com.

编辑:不能放弃这一点,现在我知道这是在工作的方式,它防止滑块到达幻灯片的结束。您只需要相应地设置初始值,以防止页面加载时滑块位于一端或另一端。