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# YUI Library Examples: Slider Control: Dual-thumb Slider with range highlight

# Slider Control: Dual-thumb Slider with range highlight

This example demonstrates a horizontal dual-thumb Slider with custom code to add a highlight to the bounded range. Some characteristics to note include the following:

- The thumbs are set on a slide bar with a 300 pixel range.
- The thumbs are configured with a 12 pixel tick size.
- Clicking on the background will animate the nearest thumb.

View example in new window.

Range offsets: 0 - 300

Status: ok

## Adding a range highlight to a dual thumb Slider

DualSlider does not come prebuilt with support for a range highlight. This example demonstrates how to add this functionality to a DualSlider.

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

- The thumb elements should be children of the slider background.
- We use `<img>` elements rather than a CSS background for the thumbs to get around a performance bottleneck when animating thumb positions in IE.
- Don't apply a CSS border to the slider background.
- The background element should have an explicit CSS position: `relative` or `absolute`.
- Both thumb elements should have an explicit CSS position: `absolute` and be initially placed at the zero position of the background. Set their initial position in the constructor if desired.

## CSS:

The example will use the css sprites technique to change the color of the highlight based on assigned classes.

#demo_bg { position: relative; background: url(../slider/assets/dual_thumb_bg.gif) 0 5px no-repeat; height: 28px; width: 310px; } #demo_bg div { position: absolute; cursor: default; top: 4px; } /* Here's the highlight element */ #demo_bg span { position: absolute; background: url(../slider/assets/dual_thumb_highlight.gif) 0 0 repeat-x; _font-size: 5px; /* prevent IE6 expanding the box height to font-size */ top: 10px; left: 12px; height: 13px; width: 288px; } #demo_bg .caution { background-position: 0 -13px; } #demo_bg .boom, #demo_bg .danger { background-position: 0 -26px; } /* We'll use the same class names for the status report region */ p .ok { color: #3a3; font-weight: bold; text-transform: uppercase; } p .caution { background: #ff3; color: #770; font-weight: bold; font-style: italic; padding: 0 1ex; text-transform: uppercase; } p .danger { color: #f33; font-weight: bold; text-decoration: blink; text-transform: uppercase; } p .boom { color: #fff; background: #000; padding: 0 1ex; }

## Markup:

Here we add an additional `span` element to use as our highlight.

<div id="demo_bg" title="Range slider"> <span id="demo_highlight"></span> <div id="demo_min_thumb"><img src="assets/l-thumb-round.gif"></div> <div id="demo_max_thumb"><img src="assets/r-thumb-round.gif"></div> </div> <p>Thumb values: <span id="demo_range"></span></p> <p>Status: <span id="demo_value"></span></p>

## Code:

(function () { YAHOO.namespace('example'); var Dom = YAHOO.util.Dom; // Slider has a range of 300 pixels var range = 300; // Set up 12 pixel ticks var tickSize = 12; // Some arbitrary ranges to cue status changes var caution_range = 150, danger_range = 75, boom_range = 13; YAHOO.util.Event.onDOMReady(function () { var reportSpan = Dom.get("demo_range"); var calculatedSpan = Dom.get("demo_value"); // Create the DualSlider var slider = YAHOO.widget.Slider.getHorizDualSlider("demo_bg", "demo_min_thumb", "demo_max_thumb", range, tickSize); // Decorate the DualSlider instance with some new properties and // methods to maintain the highlight element YAHOO.lang.augmentObject(slider, { // The current status _status : 'ok', // The highlight element _highlight : Dom.get("demo_highlight"), // A simple getter method for the status getStatus : function () { return this._status; }, // A method to update the status and update the highlight updateHighlight : function () { var delta = this.maxVal - this.minVal, newStatus = 'ok'; if (delta < boom_range) { newStatus = 'boom'; } else if (delta < danger_range) { newStatus = 'danger'; } else if (delta < caution_range) { newStatus = 'caution'; } if (this._status !== newStatus) { // Update the highlight class if status is changed Dom.replaceClass(this._highlight,this._status,newStatus); this._status = newStatus; } if (this.activeSlider === this.minSlider) { // If the min thumb moved, move the highlight's left edge Dom.setStyle(this._highlight,'left', (this.minVal + 12) + 'px'); } // Adjust the width of the highlight to match inner boundary Dom.setStyle(this._highlight,'width', Math.max(delta - 12,0) + 'px'); } },true); // Attach the highlight method to the slider's change event slider.subscribe('change',slider.updateHighlight,slider,true); // Create an event callback to update some display fields var report = function () { reportSpan.innerHTML = slider.minVal + ' - ' + slider.maxVal; // Call our conversion function calculatedSpan.innerHTML = calculatedSpan.className = slider.getStatus(); }; // Subscribe to the slider's change event to report the status. slider.subscribe('change',report); // Attach the slider to the YAHOO.example namespace for public probing YAHOO.example.slider = slider; }); })();

## 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.

### YUI Logger Output:

Note: Logging and debugging is currently turned off for this example.

Reload with logging
and debugging enabled.

### Slider Control Examples:

- Basic Vertical Slider
- Horizontal Slider with Tick Marks
- RBG Slider Control
- Bottom to top Vertical Slider
- Horizontal Slider with two thumbs
- Dual-thumb Slider with range highlight
- Basic Features (included with examples for ProgressBar Control)
- Events (included with examples for ProgressBar Control)
- Slider Button (included with examples for Button Control)
- Complex Application (included with examples for Layout Manager)

### More Slider Control Resources:

- User's Guide (external)
- API Documentation
- Cheat Sheet PDF (external)

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