Nice, downward compatible, tou

jQuery Knob canvas based ; no png or jpg sprites. touch, mouse and mousewheel, keyboard events implemented. downward compatible ; overloads an input element. Example

<input type="text" value="75" class="dial"> <script> $(function() { $(".dial").knob(); }); </script> Options

Options are provided as attributes 'data-option':

<input type="text" class="dial" data-min="-50" data-max="50">

... or in the "knob()" call :

$(".dial").knob({ 'min':-50, 'max':50 });

The following options are supported :

Behaviors :

min : min value | default=0. max : max value | default=100. step : step size | default=1. angleOffset : starting angle in degrees | default=0. angleArc : arc size in degrees | default=360. stopper : stop at min & max on keydown/mousewheel | default=true. readOnly : disable input and events | default=false. rotation : direction of progression | default=clockwise.

UI :

cursor : display mode "cursor", cursor size could be changed passing a numeric value to the option, default width is used when passing boolean value "true" | default=gauge. thickness : gauge thickness. lineCap : gauge stroke endings. | default=butt, round=rounded line endings width : dial width. height : dial height. displayInput : default=true | false=hide input. displayPrevious : default=false | true=displays the previous value with transparency. fgColor : foreground color. inputColor : input value (number) color. font : font family. fontWeight : font weight. bgColor : background color. Hooks

<script> $(".dial").knob({ 'release' : function (v) { /*make something*/ } }); </script>

'release' : executed on release

Parameters :

value : int, current value

'change' : executed at each change of the value

Parameters :

value : int, current value

'draw' : when drawing the canvas

Context :

this.g : canvas context 2D (see Canvas documentation) this.$ : jQuery wrapped element this.o : options this.i : input ... console.log(this);

'cancel' : triggered on [esc] keydown

'format' : allows to format output (add unit %, ms ...)

The scope (this) of each hook function is the current Knob instance (refer to the demo code).

Example

<input type="text" value="75" class="dial"> <script> $(".dial").knob({ 'change' : function (v) { console.log(v); } }); </script> Dynamically configure

<script> $('.dial').trigger( 'configure', { "min":10, "max":40, "fgColor":"#FF0000", "skin":"tron", "cursor":true } ); </script> Set the value

<script> $('.dial') .val(27) .trigger('change'); </script> Supported browser

Tested on Chrome, Safari, Firefox, IE>=8.0 (IE8.0 with excanvas).