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YUI Library Examples: Slider Control: Bottom to top Vertical Slider

Slider Control: Bottom to top Vertical Slider

This example demonstrates a vertical implementation of the YUI Slider Control. Some characteristics of this implementation include the following:

  • The slider range is 200 pixels.
  • CSS is used to place the slide thumb at the bottom of the slider.
  • Custom logic is added to the slider instance to convert the offset value to a "real" value calculated from a provided min/max range.
  • The custom min value is set to 10; the max 110.
  • Once the slider has focus, the up and down keys will move the thumb 20 pixels (changing the "real" value by 10).
  • When the slider value changes, the pixel offset and calculated value are reported below the slider.

Pixel offset from start: 0

Calculated Value: 0

Building a Bottom-Up Vertical Slider

You supply your own markup for the slider. Keep in mind the following points about markup for YUI Slider Control implementations:

  • The thumb element should be a child of the slider background
  • The tabindex attribute lets this element receive focus in most browsers.
  • If the slider background can receive focus, the arrow keys can be used to change this slider's value.
  • We use an <img> element rather than a CSS background for the thumb to get around a performance bottleneck when animating the thumb's position in IE.
  • Both elements should have an explicit CSS position: relative or absolute.
  • Don't apply a CSS border to the slider background



Invert the getValue offset

Offset values returned by the getValue() methods, or passed as a parameter to the change event callback, increase as the slider moves left-to-right and top-to-bottom. Making the value increase in the opposite direction is as simple as multiplying by -1.

Look for the magic in this code:

For horizontal Sliders, multiplying the offset by -1 makes values increase right-to-left.

Configuration for This Example

You can load the necessary JavaScript and CSS for this example from Yahoo's servers. Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured.

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