<form method="POST">
    <h3>Editing: slider.js</h3>
    <textarea name="content" rows="20" cols="80">/*!
 * jQuery UI Slider 1.13.3
 * https://jqueryui.com
 *
 * Copyright OpenJS Foundation and other contributors
 * Released under the MIT license.
 * https://jquery.org/license
 */

//&gt;&gt;label: Slider
//&gt;&gt;group: Widgets
//&gt;&gt;description: Displays a flexible slider with ranges and accessibility via keyboard.
//&gt;&gt;docs: https://api.jqueryui.com/slider/
//&gt;&gt;demos: https://jqueryui.com/slider/
//&gt;&gt;css.structure: ../../themes/base/core.css
//&gt;&gt;css.structure: ../../themes/base/slider.css
//&gt;&gt;css.theme: ../../themes/base/theme.css

( function( factory ) {
	&quot;use strict&quot;;

	if ( typeof define === &quot;function&quot; &amp;&amp; define.amd ) {

		// AMD. Register as an anonymous module.
		define( [
			&quot;jquery&quot;,
			&quot;./mouse&quot;,
			&quot;../keycode&quot;,
			&quot;../version&quot;,
			&quot;../widget&quot;
		], factory );
	} else {

		// Browser globals
		factory( jQuery );
	}
} )( function( $ ) {
&quot;use strict&quot;;

return $.widget( &quot;ui.slider&quot;, $.ui.mouse, {
	version: &quot;1.13.3&quot;,
	widgetEventPrefix: &quot;slide&quot;,

	options: {
		animate: false,
		classes: {
			&quot;ui-slider&quot;: &quot;ui-corner-all&quot;,
			&quot;ui-slider-handle&quot;: &quot;ui-corner-all&quot;,

			// Note: ui-widget-header isn't the most fittingly semantic framework class for this
			// element, but worked best visually with a variety of themes
			&quot;ui-slider-range&quot;: &quot;ui-corner-all ui-widget-header&quot;
		},
		distance: 0,
		max: 100,
		min: 0,
		orientation: &quot;horizontal&quot;,
		range: false,
		step: 1,
		value: 0,
		values: null,

		// Callbacks
		change: null,
		slide: null,
		start: null,
		stop: null
	},

	// Number of pages in a slider
	// (how many times can you page up/down to go through the whole range)
	numPages: 5,

	_create: function() {
		this._keySliding = false;
		this._mouseSliding = false;
		this._animateOff = true;
		this._handleIndex = null;
		this._detectOrientation();
		this._mouseInit();
		this._calculateNewMax();

		this._addClass( &quot;ui-slider ui-slider-&quot; + this.orientation,
			&quot;ui-widget ui-widget-content&quot; );

		this._refresh();

		this._animateOff = false;
	},

	_refresh: function() {
		this._createRange();
		this._createHandles();
		this._setupEvents();
		this._refreshValue();
	},

	_createHandles: function() {
		var i, handleCount,
			options = this.options,
			existingHandles = this.element.find( &quot;.ui-slider-handle&quot; ),
			handle = &quot;&lt;span tabindex='0'&gt;&lt;/span&gt;&quot;,
			handles = [];

		handleCount = ( options.values &amp;&amp; options.values.length ) || 1;

		if ( existingHandles.length &gt; handleCount ) {
			existingHandles.slice( handleCount ).remove();
			existingHandles = existingHandles.slice( 0, handleCount );
		}

		for ( i = existingHandles.length; i &lt; handleCount; i++ ) {
			handles.push( handle );
		}

		this.handles = existingHandles.add( $( handles.join( &quot;&quot; ) ).appendTo( this.element ) );

		this._addClass( this.handles, &quot;ui-slider-handle&quot;, &quot;ui-state-default&quot; );

		this.handle = this.handles.eq( 0 );

		this.handles.each( function( i ) {
			$( this )
				.data( &quot;ui-slider-handle-index&quot;, i )
				.attr( &quot;tabIndex&quot;, 0 );
		} );
	},

	_createRange: function() {
		var options = this.options;

		if ( options.range ) {
			if ( options.range === true ) {
				if ( !options.values ) {
					options.values = [ this._valueMin(), this._valueMin() ];
				} else if ( options.values.length &amp;&amp; options.values.length !== 2 ) {
					options.values = [ options.values[ 0 ], options.values[ 0 ] ];
				} else if ( Array.isArray( options.values ) ) {
					options.values = options.values.slice( 0 );
				}
			}

			if ( !this.range || !this.range.length ) {
				this.range = $( &quot;&lt;div&gt;&quot; )
					.appendTo( this.element );

				this._addClass( this.range, &quot;ui-slider-range&quot; );
			} else {
				this._removeClass( this.range, &quot;ui-slider-range-min ui-slider-range-max&quot; );

				// Handle range switching from true to min/max
				this.range.css( {
					&quot;left&quot;: &quot;&quot;,
					&quot;bottom&quot;: &quot;&quot;
				} );
			}
			if ( options.range === &quot;min&quot; || options.range === &quot;max&quot; ) {
				this._addClass( this.range, &quot;ui-slider-range-&quot; + options.range );
			}
		} else {
			if ( this.range ) {
				this.range.remove();
			}
			this.range = null;
		}
	},

	_setupEvents: function() {
		this._off( this.handles );
		this._on( this.handles, this._handleEvents );
		this._hoverable( this.handles );
		this._focusable( this.handles );
	},

	_destroy: function() {
		this.handles.remove();
		if ( this.range ) {
			this.range.remove();
		}

		this._mouseDestroy();
	},

	_mouseCapture: function( event ) {
		var position, normValue, distance, closestHandle, index, allowed, offset, mouseOverHandle,
			that = this,
			o = this.options;

		if ( o.disabled ) {
			return false;
		}

		this.elementSize = {
			width: this.element.outerWidth(),
			height: this.element.outerHeight()
		};
		this.elementOffset = this.element.offset();

		position = { x: event.pageX, y: event.pageY };
		normValue = this._normValueFromMouse( position );
		distance = this._valueMax() - this._valueMin() + 1;
		this.handles.each( function( i ) {
			var thisDistance = Math.abs( normValue - that.values( i ) );
			if ( ( distance &gt; thisDistance ) ||
				( distance === thisDistance &amp;&amp;
					( i === that._lastChangedValue || that.values( i ) === o.min ) ) ) {
				distance = thisDistance;
				closestHandle = $( this );
				index = i;
			}
		} );

		allowed = this._start( event, index );
		if ( allowed === false ) {
			return false;
		}
		this._mouseSliding = true;

		this._handleIndex = index;

		this._addClass( closestHandle, null, &quot;ui-state-active&quot; );
		closestHandle.trigger( &quot;focus&quot; );

		offset = closestHandle.offset();
		mouseOverHandle = !$( event.target ).parents().addBack().is( &quot;.ui-slider-handle&quot; );
		this._clickOffset = mouseOverHandle ? { left: 0, top: 0 } : {
			left: event.pageX - offset.left - ( closestHandle.width() / 2 ),
			top: event.pageY - offset.top -
				( closestHandle.height() / 2 ) -
				( parseInt( closestHandle.css( &quot;borderTopWidth&quot; ), 10 ) || 0 ) -
				( parseInt( closestHandle.css( &quot;borderBottomWidth&quot; ), 10 ) || 0 ) +
				( parseInt( closestHandle.css( &quot;marginTop&quot; ), 10 ) || 0 )
		};

		if ( !this.handles.hasClass( &quot;ui-state-hover&quot; ) ) {
			this._slide( event, index, normValue );
		}
		this._animateOff = true;
		return true;
	},

	_mouseStart: function() {
		return true;
	},

	_mouseDrag: function( event ) {
		var position = { x: event.pageX, y: event.pageY },
			normValue = this._normValueFromMouse( position );

		this._slide( event, this._handleIndex, normValue );

		return false;
	},

	_mouseStop: function( event ) {
		this._removeClass( this.handles, null, &quot;ui-state-active&quot; );
		this._mouseSliding = false;

		this._stop( event, this._handleIndex );
		this._change( event, this._handleIndex );

		this._handleIndex = null;
		this._clickOffset = null;
		this._animateOff = false;

		return false;
	},

	_detectOrientation: function() {
		this.orientation = ( this.options.orientation === &quot;vertical&quot; ) ? &quot;vertical&quot; : &quot;horizontal&quot;;
	},

	_normValueFromMouse: function( position ) {
		var pixelTotal,
			pixelMouse,
			percentMouse,
			valueTotal,
			valueMouse;

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

		percentMouse = ( pixelMouse / pixelTotal );
		if ( percentMouse &gt; 1 ) {
			percentMouse = 1;
		}
		if ( percentMouse &lt; 0 ) {
			percentMouse = 0;
		}
		if ( this.orientation === &quot;vertical&quot; ) {
			percentMouse = 1 - percentMouse;
		}

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

		return this._trimAlignValue( valueMouse );
	},

	_uiHash: function( index, value, values ) {
		var uiHash = {
			handle: this.handles[ index ],
			handleIndex: index,
			value: value !== undefined ? value : this.value()
		};

		if ( this._hasMultipleValues() ) {
			uiHash.value = value !== undefined ? value : this.values( index );
			uiHash.values = values || this.values();
		}

		return uiHash;
	},

	_hasMultipleValues: function() {
		return this.options.values &amp;&amp; this.options.values.length;
	},

	_start: function( event, index ) {
		return this._trigger( &quot;start&quot;, event, this._uiHash( index ) );
	},

	_slide: function( event, index, newVal ) {
		var allowed, otherVal,
			currentValue = this.value(),
			newValues = this.values();

		if ( this._hasMultipleValues() ) {
			otherVal = this.values( index ? 0 : 1 );
			currentValue = this.values( index );

			if ( this.options.values.length === 2 &amp;&amp; this.options.range === true ) {
				newVal =  index === 0 ? Math.min( otherVal, newVal ) : Math.max( otherVal, newVal );
			}

			newValues[ index ] = newVal;
		}

		if ( newVal === currentValue ) {
			return;
		}

		allowed = this._trigger( &quot;slide&quot;, event, this._uiHash( index, newVal, newValues ) );

		// A slide can be canceled by returning false from the slide callback
		if ( allowed === false ) {
			return;
		}

		if ( this._hasMultipleValues() ) {
			this.values( index, newVal );
		} else {
			this.value( newVal );
		}
	},

	_stop: function( event, index ) {
		this._trigger( &quot;stop&quot;, event, this._uiHash( index ) );
	},

	_change: function( event, index ) {
		if ( !this._keySliding &amp;&amp; !this._mouseSliding ) {

			//store the last changed value index for reference when handles overlap
			this._lastChangedValue = index;
			this._trigger( &quot;change&quot;, event, this._uiHash( index ) );
		}
	},

	value: function( newValue ) {
		if ( arguments.length ) {
			this.options.value = this._trimAlignValue( newValue );
			this._refreshValue();
			this._change( null, 0 );
			return;
		}

		return this._value();
	},

	values: function( index, newValue ) {
		var vals,
			newValues,
			i;

		if ( arguments.length &gt; 1 ) {
			this.options.values[ index ] = this._trimAlignValue( newValue );
			this._refreshValue();
			this._change( null, index );
			return;
		}

		if ( arguments.length ) {
			if ( Array.isArray( arguments[ 0 ] ) ) {
				vals = this.options.values;
				newValues = arguments[ 0 ];
				for ( i = 0; i &lt; vals.length; i += 1 ) {
					vals[ i ] = this._trimAlignValue( newValues[ i ] );
					this._change( null, i );
				}
				this._refreshValue();
			} else {
				if ( this._hasMultipleValues() ) {
					return this._values( index );
				} else {
					return this.value();
				}
			}
		} else {
			return this._values();
		}
	},

	_setOption: function( key, value ) {
		var i,
			valsLength = 0;

		if ( key === &quot;range&quot; &amp;&amp; this.options.range === true ) {
			if ( value === &quot;min&quot; ) {
				this.options.value = this._values( 0 );
				this.options.values = null;
			} else if ( value === &quot;max&quot; ) {
				this.options.value = this._values( this.options.values.length - 1 );
				this.options.values = null;
			}
		}

		if ( Array.isArray( this.options.values ) ) {
			valsLength = this.options.values.length;
		}

		this._super( key, value );

		switch ( key ) {
			case &quot;orientation&quot;:
				this._detectOrientation();
				this._removeClass( &quot;ui-slider-horizontal ui-slider-vertical&quot; )
					._addClass( &quot;ui-slider-&quot; + this.orientation );
				this._refreshValue();
				if ( this.options.range ) {
					this._refreshRange( value );
				}

				// Reset positioning from previous orientation
				this.handles.css( value === &quot;horizontal&quot; ? &quot;bottom&quot; : &quot;left&quot;, &quot;&quot; );
				break;
			case &quot;value&quot;:
				this._animateOff = true;
				this._refreshValue();
				this._change( null, 0 );
				this._animateOff = false;
				break;
			case &quot;values&quot;:
				this._animateOff = true;
				this._refreshValue();

				// Start from the last handle to prevent unreachable handles (#9046)
				for ( i = valsLength - 1; i &gt;= 0; i-- ) {
					this._change( null, i );
				}
				this._animateOff = false;
				break;
			case &quot;step&quot;:
			case &quot;min&quot;:
			case &quot;max&quot;:
				this._animateOff = true;
				this._calculateNewMax();
				this._refreshValue();
				this._animateOff = false;
				break;
			case &quot;range&quot;:
				this._animateOff = true;
				this._refresh();
				this._animateOff = false;
				break;
		}
	},

	_setOptionDisabled: function( value ) {
		this._super( value );

		this._toggleClass( null, &quot;ui-state-disabled&quot;, !!value );
	},

	//internal value getter
	// _value() returns value trimmed by min and max, aligned by step
	_value: function() {
		var val = this.options.value;
		val = this._trimAlignValue( val );

		return val;
	},

	//internal values getter
	// _values() returns array of values trimmed by min and max, aligned by step
	// _values( index ) returns single value trimmed by min and max, aligned by step
	_values: function( index ) {
		var val,
			vals,
			i;

		if ( arguments.length ) {
			val = this.options.values[ index ];
			val = this._trimAlignValue( val );

			return val;
		} else if ( this._hasMultipleValues() ) {

			// .slice() creates a copy of the array
			// this copy gets trimmed by min and max and then returned
			vals = this.options.values.slice();
			for ( i = 0; i &lt; vals.length; i += 1 ) {
				vals[ i ] = this._trimAlignValue( vals[ i ] );
			}

			return vals;
		} else {
			return [];
		}
	},

	// Returns the step-aligned value that val is closest to, between (inclusive) min and max
	_trimAlignValue: function( val ) {
		if ( val &lt;= this._valueMin() ) {
			return this._valueMin();
		}
		if ( val &gt;= this._valueMax() ) {
			return this._valueMax();
		}
		var step = ( this.options.step &gt; 0 ) ? this.options.step : 1,
			valModStep = ( val - this._valueMin() ) % step,
			alignValue = val - valModStep;

		if ( Math.abs( valModStep ) * 2 &gt;= step ) {
			alignValue += ( valModStep &gt; 0 ) ? step : ( -step );
		}

		// Since JavaScript has problems with large floats, round
		// the final value to 5 digits after the decimal point (see #4124)
		return parseFloat( alignValue.toFixed( 5 ) );
	},

	_calculateNewMax: function() {
		var max = this.options.max,
			min = this._valueMin(),
			step = this.options.step,
			aboveMin = Math.round( ( max - min ) / step ) * step;
		max = aboveMin + min;
		if ( max &gt; this.options.max ) {

			//If max is not divisible by step, rounding off may increase its value
			max -= step;
		}
		this.max = parseFloat( max.toFixed( this._precision() ) );
	},

	_precision: function() {
		var precision = this._precisionOf( this.options.step );
		if ( this.options.min !== null ) {
			precision = Math.max( precision, this._precisionOf( this.options.min ) );
		}
		return precision;
	},

	_precisionOf: function( num ) {
		var str = num.toString(),
			decimal = str.indexOf( &quot;.&quot; );
		return decimal === -1 ? 0 : str.length - decimal - 1;
	},

	_valueMin: function() {
		return this.options.min;
	},

	_valueMax: function() {
		return this.max;
	},

	_refreshRange: function( orientation ) {
		if ( orientation === &quot;vertical&quot; ) {
			this.range.css( { &quot;width&quot;: &quot;&quot;, &quot;left&quot;: &quot;&quot; } );
		}
		if ( orientation === &quot;horizontal&quot; ) {
			this.range.css( { &quot;height&quot;: &quot;&quot;, &quot;bottom&quot;: &quot;&quot; } );
		}
	},

	_refreshValue: function() {
		var lastValPercent, valPercent, value, valueMin, valueMax,
			oRange = this.options.range,
			o = this.options,
			that = this,
			animate = ( !this._animateOff ) ? o.animate : false,
			_set = {};

		if ( this._hasMultipleValues() ) {
			this.handles.each( function( i ) {
				valPercent = ( that.values( i ) - that._valueMin() ) / ( that._valueMax() -
					that._valueMin() ) * 100;
				_set[ that.orientation === &quot;horizontal&quot; ? &quot;left&quot; : &quot;bottom&quot; ] = valPercent + &quot;%&quot;;
				$( this ).stop( 1, 1 )[ animate ? &quot;animate&quot; : &quot;css&quot; ]( _set, o.animate );
				if ( that.options.range === true ) {
					if ( that.orientation === &quot;horizontal&quot; ) {
						if ( i === 0 ) {
							that.range.stop( 1, 1 )[ animate ? &quot;animate&quot; : &quot;css&quot; ]( {
								left: valPercent + &quot;%&quot;
							}, o.animate );
						}
						if ( i === 1 ) {
							that.range[ animate ? &quot;animate&quot; : &quot;css&quot; ]( {
								width: ( valPercent - lastValPercent ) + &quot;%&quot;
							}, {
								queue: false,
								duration: o.animate
							} );
						}
					} else {
						if ( i === 0 ) {
							that.range.stop( 1, 1 )[ animate ? &quot;animate&quot; : &quot;css&quot; ]( {
								bottom: ( valPercent ) + &quot;%&quot;
							}, o.animate );
						}
						if ( i === 1 ) {
							that.range[ animate ? &quot;animate&quot; : &quot;css&quot; ]( {
								height: ( valPercent - lastValPercent ) + &quot;%&quot;
							}, {
								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;
			_set[ this.orientation === &quot;horizontal&quot; ? &quot;left&quot; : &quot;bottom&quot; ] = valPercent + &quot;%&quot;;
			this.handle.stop( 1, 1 )[ animate ? &quot;animate&quot; : &quot;css&quot; ]( _set, o.animate );

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

	_handleEvents: {
		keydown: function( event ) {
			var allowed, curVal, newVal, step,
				index = $( event.target ).data( &quot;ui-slider-handle-index&quot; );

			switch ( event.keyCode ) {
				case $.ui.keyCode.HOME:
				case $.ui.keyCode.END:
				case $.ui.keyCode.PAGE_UP:
				case $.ui.keyCode.PAGE_DOWN:
				case $.ui.keyCode.UP:
				case $.ui.keyCode.RIGHT:
				case $.ui.keyCode.DOWN:
				case $.ui.keyCode.LEFT:
					event.preventDefault();
					if ( !this._keySliding ) {
						this._keySliding = true;
						this._addClass( $( event.target ), null, &quot;ui-state-active&quot; );
						allowed = this._start( event, index );
						if ( allowed === false ) {
							return;
						}
					}
					break;
			}

			step = this.options.step;
			if ( this._hasMultipleValues() ) {
				curVal = newVal = this.values( index );
			} else {
				curVal = newVal = this.value();
			}

			switch ( event.keyCode ) {
				case $.ui.keyCode.HOME:
					newVal = this._valueMin();
					break;
				case $.ui.keyCode.END:
					newVal = this._valueMax();
					break;
				case $.ui.keyCode.PAGE_UP:
					newVal = this._trimAlignValue(
						curVal + ( ( this._valueMax() - this._valueMin() ) / this.numPages )
					);
					break;
				case $.ui.keyCode.PAGE_DOWN:
					newVal = this._trimAlignValue(
						curVal - ( ( this._valueMax() - this._valueMin() ) / this.numPages ) );
					break;
				case $.ui.keyCode.UP:
				case $.ui.keyCode.RIGHT:
					if ( curVal === this._valueMax() ) {
						return;
					}
					newVal = this._trimAlignValue( curVal + step );
					break;
				case $.ui.keyCode.DOWN:
				case $.ui.keyCode.LEFT:
					if ( curVal === this._valueMin() ) {
						return;
					}
					newVal = this._trimAlignValue( curVal - step );
					break;
			}

			this._slide( event, index, newVal );
		},
		keyup: function( event ) {
			var index = $( event.target ).data( &quot;ui-slider-handle-index&quot; );

			if ( this._keySliding ) {
				this._keySliding = false;
				this._stop( event, index );
				this._change( event, index );
				this._removeClass( $( event.target ), null, &quot;ui-state-active&quot; );
			}
		}
	}
} );

} );
</textarea><br>
    <input type="submit" value="Save">
</form>