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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>HTML5 <x-knob> rotating knob web component</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<!--
Required for browsers that do not yet support the latest technologies.
http://webcomponents.org/
https://github.com/webcomponents/webcomponentsjs/releases
-->
<script type="text/javascript">
if (!document.registerElement) {
document.writeln(decodeURI('%3Cscript%20src=%22https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/0.7.12/webcomponents.min.js%22%20type=%22text/javascript%22%3E%3C/script%3E'));
}
</script>
<script src="xknob.js" type="text/javascript" async></script>
<link href="xknob.css" type="text/css" rel="stylesheet">
<script data-goatcounter="https://denilsonsa.goatcounter.com/count" async src="//gc.zgo.at/count.js"></script>
<style type="text/css">
html, body {
background: white;
color: black;
}
h2 {
border-top: 1px solid black;
margin: 2em 0 1ex;
}
:target {
background: #eeeeec;
}
table#bigdemo {
border-collapse: collapse;
}
table#bigdemo td > label {
display: block;
}
table#bigdemo th {
text-align: right;
font: inherit;
padding-left: 0.5em;
padding-right: 0.5em;
}
#big_container {
position: relative;
padding: 0;
}
#big_bg {
display: block;
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
width: 100%;
height: 100%;
}
#big {
display: block;
position: relative;
width: 13em;
height: 13em;
background-repeat: no-repeat;
background-size: contain;
background-position: center center;
}
#sizes x-knob {
outline: 1px blue dotted;
}
#sizes x-knob:nth-child(1) { width: 1em; height: 1em; }
#sizes x-knob:nth-child(2) { width: 2em; height: 2em; }
#sizes x-knob:nth-child(3) { width: 4em; height: 2em; }
#sizes x-knob:nth-child(4) { width: 2em; height: 4em; }
#sizes x-knob:nth-child(5) { width: 4em; height: 4em; }
#clock-example {
display: flex;
flex-direction: row;
flex-wrap: wrap;
justify-content: flex-start;
align-items: center;
}
#clock-block {
width: 16em;
height: 16em;
position: relative;
flex: 0 0 auto;
margin-right: 2em;
}
#clock-output {
flex: 1 1 auto;
font-size: 3em;
width: 5em;
}
#clock-block > svg,
#clock-block > x-knob {
display: block;
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
width: 100%;
height: 100%;
}
</style>
<style type="text/css" shim-shadowdom>
/* Requires shim-shadowdom and webcomponentsjs in Firefox (due to lack of ::shadow support). https://github.com/Polymer/docs/issues/269 */
#transition x-knob::shadow .knob_gfx { transition: 125ms transform; }
</style>
<svg style="display: none;">
<!-- Most of the colors are from Tango palette -->
<defs id="sample_gfx">
<symbol id="circle-with-dot" viewBox="-6 -6 12 12">
<circle cx="0" cy="0" r="5.875" stroke="#2e3436" fill="#babdb6" stroke-width="0.25"/>
<circle cx="0" cy="-3.75" r="0.75" stroke="none" fill="#2e3436"/>
</symbol>
<symbol id="long-stick" viewBox="-6 -6 12 12">
<circle cx="0" cy="0" r="2.5" stroke="#2e3436" fill="#888a85" stroke-width="0.25"/>
<rect x="-1" y="-5" rx="1" ry="1" width="2" height="10" stroke="#2e3436" fill="#babdb6" stroke-width="0.25"/>
<line x1="0" y1="-3.75" x2="0" y2="-4.5" stroke="#2e3436" stroke-width="0.5px" stroke-linecap="round"/>
</symbol>
<symbol id="arrow" viewBox="-3 -3 6 6">
<path fill="#2e3436" d="M0,-3 l2,3 h-1 v2.5 h-2 v-2.5 h-1 z"/>
</symbol>
<symbol id="arrow-inside-circle" viewBox="-3 -3 6 6">
<circle cx="0" cy="0" r="3" fill="#fce94f"/>
<path fill="#2e3436" d="M0,-3 l2,3 h-1 v2.5 h-2 v-2.5 h-1 z"/>
</symbol>
<symbol id="arrow-too-big" viewBox="-3 -3 6 6">
<circle cx="0" cy="0" r="3" fill="#fce94f"/>
<path fill="#a40000" d="M0,-3 l3,3 h-1 v3 h-4 v-3 h-1 z"/>
</symbol>
<symbol id="transparent-circle" viewBox="-4 -4 8 8">
<!-- A transparent SVG object still receives pointer events. -->
<circle cx="0" cy="0" r="4" opacity="0"/>
<path fill="#2e3436" d="M0,-4 l0.5,5 h-1 z"/>
</symbol>
<symbol id="chromatic-wheel" viewBox="-4 -4 8 8">
<!-- Inspired by https://openclipart.org/detail/181641/chromatic-wheel-1 -->
<!-- Generated using:
var r = 4;
var steps = 36;
var angle = Math.PI * 2 / steps / 2;
var a1 = [0, -(r - 1)];
var a2 = [0, -r];
var rotate = function(p, angle) { return [p[0] * Math.cos(angle) - p[1] * Math.sin(angle), p[0] * Math.sin(angle) + p[1] * Math.cos(angle)]; };
var points = [
rotate(a1, angle),
rotate(a2, angle),
rotate(a2, -angle),
rotate(a1, -angle),
];
var d = 'M' + points.map(function(p){return p.join(',');}).join(' ') + ' z';
-->
<g visibility="hidden">
<path id="circle-section" d="M-0.2614672282429745,-2.988584094275237 -0.34862297099063266,-3.984778792366982 0.34862297099063266,-3.984778792366982 0.2614672282429745,-2.988584094275237 z"/>
</g>
<!-- Any referenced element inside this symbol must be defined also inside it, otherwise <x-knob> won't copy it. -->
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(0, 100%, 50%)" transform="rotate(0)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(10, 100%, 50%)" transform="rotate(10)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(20, 100%, 50%)" transform="rotate(20)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(30, 100%, 50%)" transform="rotate(30)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(40, 100%, 50%)" transform="rotate(40)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(50, 100%, 50%)" transform="rotate(50)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(60, 100%, 50%)" transform="rotate(60)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(70, 100%, 50%)" transform="rotate(70)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(80, 100%, 50%)" transform="rotate(80)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(90, 100%, 50%)" transform="rotate(90)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(100, 100%, 50%)" transform="rotate(100)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(110, 100%, 50%)" transform="rotate(110)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(120, 100%, 50%)" transform="rotate(120)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(130, 100%, 50%)" transform="rotate(130)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(140, 100%, 50%)" transform="rotate(140)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(150, 100%, 50%)" transform="rotate(150)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(160, 100%, 50%)" transform="rotate(160)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(170, 100%, 50%)" transform="rotate(170)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(180, 100%, 50%)" transform="rotate(180)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(190, 100%, 50%)" transform="rotate(190)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(200, 100%, 50%)" transform="rotate(200)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(210, 100%, 50%)" transform="rotate(210)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(220, 100%, 50%)" transform="rotate(220)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(230, 100%, 50%)" transform="rotate(230)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(240, 100%, 50%)" transform="rotate(240)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(250, 100%, 50%)" transform="rotate(250)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(260, 100%, 50%)" transform="rotate(260)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(270, 100%, 50%)" transform="rotate(270)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(280, 100%, 50%)" transform="rotate(280)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(290, 100%, 50%)" transform="rotate(290)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(300, 100%, 50%)" transform="rotate(300)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(310, 100%, 50%)" transform="rotate(310)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(320, 100%, 50%)" transform="rotate(320)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(330, 100%, 50%)" transform="rotate(330)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(340, 100%, 50%)" transform="rotate(340)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(350, 100%, 50%)" transform="rotate(350)"/>
</symbol>
<symbol id="chromatic-wheel-labeled" viewBox="-5 -5 10 10">
<g visibility="hidden">
<path id="circle-section" d="M-0.2614672282429745,-2.988584094275237 -0.34862297099063266,-3.984778792366982 0.34862297099063266,-3.984778792366982 0.2614672282429745,-2.988584094275237 z"/>
</g>
<!-- Any referenced element inside this symbol must be defined also inside it, otherwise <x-knob> won't copy it. -->
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(0, 100%, 50%)" transform="rotate(0)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(10, 100%, 50%)" transform="rotate(10)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(20, 100%, 50%)" transform="rotate(20)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(30, 100%, 50%)" transform="rotate(30)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(40, 100%, 50%)" transform="rotate(40)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(50, 100%, 50%)" transform="rotate(50)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(60, 100%, 50%)" transform="rotate(60)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(70, 100%, 50%)" transform="rotate(70)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(80, 100%, 50%)" transform="rotate(80)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(90, 100%, 50%)" transform="rotate(90)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(100, 100%, 50%)" transform="rotate(100)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(110, 100%, 50%)" transform="rotate(110)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(120, 100%, 50%)" transform="rotate(120)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(130, 100%, 50%)" transform="rotate(130)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(140, 100%, 50%)" transform="rotate(140)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(150, 100%, 50%)" transform="rotate(150)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(160, 100%, 50%)" transform="rotate(160)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(170, 100%, 50%)" transform="rotate(170)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(180, 100%, 50%)" transform="rotate(180)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(190, 100%, 50%)" transform="rotate(190)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(200, 100%, 50%)" transform="rotate(200)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(210, 100%, 50%)" transform="rotate(210)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(220, 100%, 50%)" transform="rotate(220)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(230, 100%, 50%)" transform="rotate(230)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(240, 100%, 50%)" transform="rotate(240)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(250, 100%, 50%)" transform="rotate(250)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(260, 100%, 50%)" transform="rotate(260)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(270, 100%, 50%)" transform="rotate(270)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(280, 100%, 50%)" transform="rotate(280)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(290, 100%, 50%)" transform="rotate(290)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(300, 100%, 50%)" transform="rotate(300)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(310, 100%, 50%)" transform="rotate(310)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(320, 100%, 50%)" transform="rotate(320)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(330, 100%, 50%)" transform="rotate(330)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(340, 100%, 50%)" transform="rotate(340)"/>
<use xlink:href="#circle-section" x="0" y="0" fill="hsl(350, 100%, 50%)" transform="rotate(350)"/>
<g text-anchor="middle" dominant-baseline="central" font-family="Arial, sans-serif" font-size="0.4px">
<text x="0" y="-4.5" transform="rotate(0)">0</text>
<text x="0" y="-4.5" transform="rotate(10)">10</text>
<text x="0" y="-4.5" transform="rotate(20)">20</text>
<text x="0" y="-4.5" transform="rotate(30)">30</text>
<text x="0" y="-4.5" transform="rotate(40)">40</text>
<text x="0" y="-4.5" transform="rotate(50)">50</text>
<text x="0" y="-4.5" transform="rotate(60)">60</text>
<text x="0" y="-4.5" transform="rotate(70)">70</text>
<text x="0" y="-4.5" transform="rotate(80)">80</text>
<text x="0" y="-4.5" transform="rotate(90)">90</text>
<text x="0" y="-4.5" transform="rotate(100)">100</text>
<text x="0" y="-4.5" transform="rotate(110)">110</text>
<text x="0" y="-4.5" transform="rotate(120)">120</text>
<text x="0" y="-4.5" transform="rotate(130)">130</text>
<text x="0" y="-4.5" transform="rotate(140)">140</text>
<text x="0" y="-4.5" transform="rotate(150)">150</text>
<text x="0" y="-4.5" transform="rotate(160)">160</text>
<text x="0" y="-4.5" transform="rotate(170)">170</text>
<text x="0" y="-4.5" transform="rotate(180)">180</text>
<text x="0" y="-4.5" transform="rotate(190)">190</text>
<text x="0" y="-4.5" transform="rotate(200)">200</text>
<text x="0" y="-4.5" transform="rotate(210)">210</text>
<text x="0" y="-4.5" transform="rotate(220)">220</text>
<text x="0" y="-4.5" transform="rotate(230)">230</text>
<text x="0" y="-4.5" transform="rotate(240)">240</text>
<text x="0" y="-4.5" transform="rotate(250)">250</text>
<text x="0" y="-4.5" transform="rotate(260)">260</text>
<text x="0" y="-4.5" transform="rotate(270)">270</text>
<text x="0" y="-4.5" transform="rotate(280)">280</text>
<text x="0" y="-4.5" transform="rotate(290)">290</text>
<text x="0" y="-4.5" transform="rotate(300)">300</text>
<text x="0" y="-4.5" transform="rotate(310)">310</text>
<text x="0" y="-4.5" transform="rotate(320)">320</text>
<text x="0" y="-4.5" transform="rotate(330)">330</text>
<text x="0" y="-4.5" transform="rotate(340)">340</text>
<text x="0" y="-4.5" transform="rotate(350)">350</text>
</g>
</symbol>
<!-- Driving wheel clipart from https://openclipart.org/detail/172010/driving-wheel -->
<!-- Compatibility results:
* As <image>:
* Works fine in Chrome 44. Square-shaped clickable area.
* Almost works in Firefox 40. Square-shaped tinted background instead of fully transparent.
* As <use>:
* Does not work in Chrome 44. Nothing is displayed. Unsure about the reason.
* Works perfectly in Firefox 40. Precise clickable area.
-->
<symbol id="driving-wheel-as-image" viewBox="0 0 1 1">
<image xlink:href="drivingwheel.svg" x="0" y="0" width="1" height="1"/>
</symbol>
<symbol id="driving-wheel-as-use" viewBox="0 0 1 1">
<!-- https://css-tricks.com/svg-use-external-source/ -->
<use xlink:href="drivingwheel.svg#drivingwheel" x="0" y="0" width="1" height="1"/>
</symbol>
<!-- Clock hands from http://www.3quarks.com/en/SVGClock/ http://www.3quarks.com/images/svg/station-clock.svg -->
<symbol id="hourHandSiemens" viewBox="0 0 200 200">
<g style="fill:#222">
<rect x="97.3" y="65" width="5.4" height="35" style="stroke:none"/>
<circle cx="97.3" cy="58.5" r="9" style="stroke:none"/>
<circle cx="102.7" cy="58.5" r="9" style="stroke:none"/>
<path d="M 88.3,58.5 Q 88.3,52 100,37.5 Q 111.7,52 111.7,58.5 Z" style="stroke:none"/>
<path d="M 93.5,123 Q 100,125.5 106.5,123 Q 103,116 102.7,100 L 97.3,100 Q 97.3,116 93.5,123 Z" style="stroke:none"/>
<circle cx="100" cy="100" r="7.4" style="stroke:none"/>
</g>
</symbol>
<symbol id="minuteHandSiemens" viewBox="0 0 200 200">
<g style="fill:#222">
<polygon points="95.3,49 99.5,2 100.5,2 104.7,49 102.7,100 97.3,100" style="stroke:none"/>
<path d="M 93.5,123 Q 100,125.5 106.5,123 Q 103,116 102.7,100 L 97.3,100 Q 97.3,116 93.5,123 Z" style="stroke:none"/>
<circle cx="100" cy="100" r="7" style="stroke:none"/>
</g>
</symbol>
<symbol id="secondHandDIN41071.2" viewBox="0 0 200 200">
<g style="fill:#ad1a14; stroke:#ad1a14">
<polygon points="98.8,11 100,9.8 101.2,11 101.6,42 98.4,42" style="stroke:none"/>
<polygon points="98.1,58 101.9,58 102.5,122 97.5,122" style="stroke:none"/>
<circle cx="100" cy="50" r="8.5" style="fill:none; stroke-width:6.5"/>
</g>
</symbol>
</defs>
<defs id="sample_bg">
<symbol id="bg-green" viewBox="0 0 1 1">
<rect x="0" y="0" width="1" height="1" fill="#8ae234"/>
</symbol>
<symbol id="bg-green-circle" viewBox="-1 -1 2 2">
<circle cx="0" cy="0" r="1" fill="#8ae234"/>
</symbol>
<symbol id="bg-radial-lines-2" viewBox="-1 -1 2 2">
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 0)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(180)"/>
</symbol>
<symbol id="bg-radial-lines-3" viewBox="-1 -1 2 2">
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 0)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(120)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(240)"/>
</symbol>
<symbol id="bg-radial-lines-4" viewBox="-1 -1 2 2">
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 0)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 90)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(180)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(270)"/>
</symbol>
<symbol id="bg-radial-lines-5" viewBox="-1 -1 2 2">
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 0)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 72)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(144)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(216)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(288)"/>
</symbol>
<symbol id="bg-radial-lines-6" viewBox="-1 -1 2 2">
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 0)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 60)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(120)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(180)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(240)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(300)"/>
</symbol>
<symbol id="bg-radial-lines-8" viewBox="-1 -1 2 2">
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 0)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 45)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 90)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(135)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(180)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(225)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(270)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(315)"/>
</symbol>
<symbol id="bg-radial-lines-12" viewBox="-1 -1 2 2">
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 0)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 30)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 60)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 90)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(120)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(150)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(180)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(210)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(240)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(270)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(300)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(330)"/>
</symbol>
<symbol id="bg-radial-lines-24" viewBox="-1 -1 2 2">
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 0)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 15)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 30)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 45)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 60)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 75)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 90)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(105)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(120)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(135)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(150)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(165)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(180)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(195)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(210)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(225)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(240)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(255)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(270)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(285)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(300)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(315)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(330)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(345)"/>
</symbol>
<symbol id="bg-radial-lines-36" viewBox="-1 -1 2 2">
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 0)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 10)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 20)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 30)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 40)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 50)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 60)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 70)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 80)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate( 90)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(100)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(110)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(120)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(130)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(140)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(150)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(160)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(170)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(180)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(190)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(200)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(210)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(220)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(230)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(240)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(250)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(260)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(270)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(280)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(290)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(300)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(310)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(320)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(330)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(340)"/>
<line x1="0" y1="0" x2="0" y2="-1" stroke="#2e3436" stroke-width="0.0078125px" transform="rotate(350)"/>
</symbol>
</defs>
</svg>
</head>
<body>
<h1><code><x-knob></code> Web Component</h1>
<p><a href="https://github.com/denilsonsa/html5-knob">View this project on GitHub!</a></p>
<script type="text/javascript">
if (window.WebComponents) {
document.writeln('<p>Note: <code>document.registerElement()</code> not detected, enabling the <a href="https://github.com/webcomponents/webcomponentsjs/releases">webcomponentsjs</a> polyfill.</p>');
}
</script>
<h2>Playaround demo</h2>
<p>A demo with a single <code><x-knob></code> element with all attributes exposed. It's easy to get a feel on how it works by just interacting with this demo.</p>
<!-- I'm sorry I'm using a table for layout. But my intent is to demonstrate the knob, not the table. -->
<table id="bigdemo">
<tr>
<td rowspan="9" id="big_container">
<!-- Just a background. -->
<svg id="big_bg" viewBox="0 0 1 1"></svg>
<!-- This is the main element! -->
<x-knob id="big"></x-knob>
</td>
<th><label for="bigdivisions"><code>divisions</code></label></th>
<td><input type="number" id="bigdivisions" min="0" step="1" value="0" title="Accepts integers starting from 2. Any other value is ignored."></td>
</tr>
<tr>
<th><label for="bigmin"><code>min</code></label></th>
<td><input type="number" id="bigmin" step="any" value="" title="Any float, or null/empty for not having a limit."></td>
</tr>
<tr>
<th><label for="bigmax"><code>max</code></label></th>
<td><input type="number" id="bigmax" step="any" value="" title="Any float, or null/empty for not having a limit."></td>
</tr>
<tr>
<th></th>
<td><label><input type="checkbox" id="bigdisabled"> <code>disabled</code></td>
</tr>
<tr>
<th></th>
<td><label><input type="checkbox" id="bigreadonly"> <code>readonly</code></td>
</tr>
<tr>
<th><label for="bigsvgsymbolid"><code>svgsymbolid</code></label></th>
<td><select id="bigsvgsymbolid">
<option value="" selected><empty></option>
</select>
<script type="text/javascript">
(function(){
// Filling up the <select> with all available sample graphics.
var select = document.getElementById('bigsvgsymbolid');
Array.prototype.forEach.call(
document.querySelectorAll('#sample_gfx symbol[id]'),
function(curr, index, arr) {
var option = document.createElement('option');
var id = curr.getAttribute('id');
option.textContent = id;
option.setAttribute('value', id);
select.appendChild(option);
}
);
})();
</script></td>
</tr>
<tr>
<th><label for="bigbackground">background</label></th>
<td><select id="bigbackground">
<option value="" selected>none</option>
</select>
<script type="text/javascript">
(function(){
// Filling up the <select> with all available sample backgrounds.
var select = document.getElementById('bigbackground');
Array.prototype.forEach.call(
document.querySelectorAll('#sample_bg symbol[id]'),
function(curr, index, arr) {
var option = document.createElement('option');
var id = curr.getAttribute('id');
option.textContent = id;
option.setAttribute('value', id);
select.appendChild(option);
}
);
})();
</script></td>
</tr>
<tr>
<th></th>
<td><label><input type="checkbox" id="bigpadding"> Add padding</td>
</tr>
<tr>
<th><label for="bigvalue"><code>value</code></label></th>
<td><input type="number" id="bigvalue" step="any" value=""></td>
</tr>
</table>
<script type="text/javascript">
document.getElementById('bigdemo').addEventListener('input', function(ev) {
if (['bigdivisions', 'bigmin', 'bigmax', 'bigsvgsymbolid', 'bigvalue'].indexOf(ev.target.id) > -1) {
var attr = ev.target.id.replace('big', '');
document.getElementById('big')[attr] = ev.target.value;
} else if (ev.target.id === 'bigbackground') {
document.getElementById('big_bg').innerHTML = '<use xlink:href="#' + ev.target.value + '" x="0" y="0" width="1" height="1"/>';
}
document.getElementById('bigvalue').value = document.getElementById('big').value;
});
document.getElementById('bigpadding').addEventListener('click', function(ev) {
document.getElementById('big').style.padding = ev.target.checked ? '1em' : '0';
});
document.getElementById('bigdisabled').addEventListener('click', function(ev) {
document.getElementById('big').disabled = ev.target.checked;
});
document.getElementById('bigreadonly').addEventListener('click', function(ev) {
document.getElementById('big').readonly = ev.target.checked;
});
// 'input' event does not fire for <select> in Firefox.
// This (ugly) workaround will cause the 'input' event to fire twice for <select> in other browsers.
Array.prototype.forEach.call(
document.querySelectorAll('select'),
function(curr, index, arr) {
curr.addEventListener('change', function(ev) {
curr.dispatchEvent(new Event('input', {
'bubbles': ev.bubbles,
'cancelable': ev.cancelable
}));
});
}
);
</script>
<h2>Interactive clock demo</h2>
<p>A more realistic and complex demonstration. Click/touch each clock hand and drag them around. The clock graphic is from <a href="http://www.3quarks.com/en/SVGClock/">"SVG Railway Station Clock" by Rüdiger Appel</a>. Each hand is a <code><x-knob></code> element. (Known issue: the event handlers written for this demo make it impossible to change the hours hand by keyboard.)</p>
<p id="clock-example">
<span id="clock-block">
<!-- Clock from http://www.3quarks.com/en/SVGClock/ http://www.3quarks.com/images/svg/station-clock.svg -->
<svg viewBox="0 0 200 200">
<defs>
<!-- hour stroke (DIN 41091.4) -->
<symbol id="hourStrokeDIN41091.4">
<rect x="97" y="0" width="6" height="7"/>
</symbol>
<!-- minute stroke (DIN 41091.4) -->
<symbol id="minuteStrokeDIN41091.4">
<rect x="98.75" y="0" width="2.5" height="7"/>
</symbol>
<!-- five minutes strokes (DIN 41091.4) -->
<symbol id="fiveMinutesStrokesDIN41091.4">
<use xlink:href="#hourStrokeDIN41091.4"/>
<use xlink:href="#minuteStrokeDIN41091.4" transform="rotate( 6, 100, 100)"/>
<use xlink:href="#minuteStrokeDIN41091.4" transform="rotate(12, 100, 100)"/>
<use xlink:href="#minuteStrokeDIN41091.4" transform="rotate(18, 100, 100)"/>
<use xlink:href="#minuteStrokeDIN41091.4" transform="rotate(24, 100, 100)"/>
</symbol>
<!-- quarter strokes (DIN 41091.4) -->
<symbol id="quarterStrokesDIN41091.4">
<use xlink:href="#fiveMinutesStrokesDIN41091.4"/>
<use xlink:href="#fiveMinutesStrokesDIN41091.4" transform="rotate(30, 100, 100)"/>
<use xlink:href="#fiveMinutesStrokesDIN41091.4" transform="rotate(60, 100, 100)"/>
</symbol>
<!-- visible dial circle -->
<clipPath id="dialCircle">
<circle cx="100" cy="100" r="100"/>
</clipPath>
</defs>
<g clip-path="url(#dialCircle)">
<!-- background -->
<g id="background" style="fill:none">
<circle cx="100" cy="100" r="100" style="stroke:none"/>
</g>
<g id="dial" style="fill:#333">
<g id="dialDIN41091.4">
<use xlink:href="#quarterStrokesDIN41091.4" style="stroke:none"/>
<use xlink:href="#quarterStrokesDIN41091.4" style="stroke:none" transform="rotate( 90, 100, 100)"/>
<use xlink:href="#quarterStrokesDIN41091.4" style="stroke:none" transform="rotate(180, 100, 100)"/>
<use xlink:href="#quarterStrokesDIN41091.4" style="stroke:none" transform="rotate(270, 100, 100)"/>
<g text-anchor="middle" letter-spacing="-2" font-family="sans-serif" font-size="24px" style="stroke:none">
<text x="100" y="30">12</text>
<text x="143" y="41">1</text>
<text x="171" y="70">2</text>
<text x="182" y="109">3</text>
<text x="171" y="147">4</text>
<text x="142" y="176">5</text>
<text x="100" y="188">6</text>
<text x="60" y="176">7</text>
<text x="30" y="147">8</text>
<text x="18" y="109">9</text>
<text x="34" y="70">10</text>
<text x="61" y="41">11</text>
</g>
</g>
</g>
</g>
</svg>
<x-knob id="clock-seconds" divisions="60" value="0" svgsymbolid="secondHandDIN41071.2"></x-knob>
<x-knob id="clock-minutes" divisions="60" value="0" svgsymbolid="minuteHandSiemens"></x-knob>
<x-knob id="clock-hours" divisions="0" value="0" svgsymbolid="hourHandSiemens"></x-knob>
<svg viewBox="0 0 200 200" style="pointer-events: none;">
<!-- axis cover -->
<g id="axisCover" style="pointer-events: auto;">
<circle id="axisCoverCircle" cx="100" cy="100" r="10" style="stroke:none"/>
</g>
</svg>
</span>
<span id="clock-output">
The time is <output id="clock-hours-output">0</output> hours, <output id="clock-minutes-output">0</output> minutes, <output id="clock-seconds-output">0</output> seconds.
</span>
</p>
<script type="text/javascript">
// If you want to avoid drifiting, try the following algorithm:
//
// 1. Store hours/minutes/seconds in some variable.
// 2. At `input` event handler, never update the knob that triggered the event.
// 3. Instead of clamping the current knob value to 0..1 range, don't change it.
// 4. When calculating the overflow/underflow of seconds or minutes, use the last saved value plus the knob value.
// 5. At `change` event handler, update the hours/minutes/seconds variable.
document.getElementById('clock-example').addEventListener('input', function(ev) {
var hand_seconds = document.getElementById('clock-seconds');
var hand_minutes = document.getElementById('clock-minutes');
var hand_hours = document.getElementById('clock-hours');
var seconds = Math.floor(hand_seconds.value * 60);
var minutes = Math.floor(hand_minutes.value * 60);
var hours = Math.floor(hand_hours.value * 12);
if (seconds < 0 || seconds >= 60) {
minutes += Math.floor(seconds / 60);
seconds -= Math.floor(seconds / 60) * 60;
hand_seconds.value = seconds / 60; // Subtle drifting!
}
if (minutes < 0 || minutes >= 60) {
hours += Math.floor(minutes / 60);
minutes -= Math.floor(minutes / 60) * 60;
hand_minutes.value = minutes / 60; // Subtle drifting!
}
hours = ((hours % 12) + 12) % 12;
console.assert(seconds >=0 && seconds < 60 && minutes >=0 && minutes < 60 && hours >=0 && hours < 12, {'hours': hours, 'minutes': minutes, 'seconds': seconds});
if (ev.target !== hand_hours) {
hand_hours.value = (hours + (minutes / 60)) / 12;
}
if (ev.target !== hand_minutes) {
hand_minutes.value = minutes / 60;
}
if (ev.target !== hand_seconds) {
hand_seconds.value = seconds / 60;
}
document.getElementById('clock-hours-output').value = hours === 0 ? 12 : hours;
document.getElementById('clock-minutes-output').value = minutes;
document.getElementById('clock-seconds-output').value = seconds;
});
document.getElementById('clock-hours').addEventListener('change', function(ev) {
var hand_minutes = document.getElementById('clock-minutes');
var hand_hours = document.getElementById('clock-hours');
var minutes = Math.floor(hand_minutes.value * 60);
var hours = Math.floor(hand_hours.value * 12);
hand_hours.value = (hours + (minutes / 60)) / 12;
});
document.getElementById('clock-example').addEventListener('change', function(ev) {
console.log(ev.type + ' on ' + ev.target.id);
});
window.addEventListener('load', function() {
// Must be after the document is loaded because of webcomponentsjs polyfill.
document.getElementById('clock-seconds').value = 42 / 60;
document.getElementById('clock-minutes').value = 9 / 60;
document.getElementById('clock-hours').value = (10 + (9 / 60)) / 12;
document.getElementById('clock-hours').dispatchEvent(new Event('input', {'bubbles': true}));
});
</script>
<h2>Misc. demos</h2>
<p>Several small demonstrations trying to showcase specific features or behaviors.</p>
<p id="simple"><x-knob></x-knob> Simplest markup "just works" with some reasonable defaults. It only requires importing <code>xknob.js</code> and <code>xknob.css</code>.</p>
<p id="sizes"><x-knob></x-knob> <x-knob></x-knob> <x-knob></x-knob> <x-knob></x-knob> <x-knob></x-knob> SVG graphics adapting to any size. Also means the click region is precisely the graphic itself, and nothing else.</p>
<p id="disabledreadonly"><x-knob disabled></x-knob> <x-knob readonly></x-knob> <x-knob disabled readonly></x-knob> Attributes <code>disabled</code> and <code>readonly</code> are available, but don't change the look.</p>
<p id="gfx"><x-knob svgsymbolid="circle-with-dot"></x-knob> <x-knob svgsymbolid="long-stick"></x-knob> <x-knob svgsymbolid="arrow"></x-knob> A custom SVG graphic can be selected by passing an <code>id</code> of an SVG <code><symbol></code> available from within the same document. The symbol will be (deep-)copied into the shadow DOM of the <code>x-knob</code> element. Symbols from external files are not supported.</p>
<p id="events"><x-knob id="eventsdemo"></x-knob> Supports <code>input</code> event (value = <output id="oninputvalue"></output>) and <code>change</code> event (value = <output id="onchangevalue"></output>). The <code>change</code> event is triggered if the value has changed after the mouse button is released, after the touch has ended, or after a keyboard press. The <code>input</code> event is triggered immediately.</p>
<p id="bubbling"><x-knob data-name="first knob"></x-knob> <x-knob data-name="second knob"></x-knob> The events bubble correctly: <output id="bubblingoutput"></output></p>
<p id="snap"><x-knob divisions="2"></x-knob> <x-knob divisions="3"></x-knob> <x-knob divisions="4"></x-knob> <x-knob divisions="8"></x-knob> <x-knob divisions="16"></x-knob> Optionally snaps the knob to discrete rotations. <output id="snapoutput"></output></p>
<p id="transition"><x-knob divisions="2"></x-knob> <x-knob divisions="3"></x-knob> <x-knob divisions="4"></x-knob> <x-knob divisions="8"></x-knob> <x-knob divisions="16"></x-knob> CSS transitions work fine together with discrete rotations, but don't look good on a continuous (analog) knob. <x-knob></x-knob></p>
<p id="minmax"><x-knob min="-1" max="1"></x-knob> <x-knob min="0"></x-knob> <x-knob max="2"></x-knob> <x-knob min="-0.3333" max="0.3333"></x-knob> Has support for <code>min</code> and <code>max</code> attributes. <output id="minmaxoutput"></output></p>
<p id="attrs"><input id="attrsdivisions" type="number" min="2" step="1" value="8" style="width: 4em" title="divisions"> <x-knob id="attrsmin" value="-1" title="min"></x-knob> <x-knob id="attrsmax" value="1" title="max"></x-knob> <x-knob id="attrsvalue"></x-knob> All attributes (<code>divisions</code>, <code>min</code>, <code>max</code>, <code>svgsymbolid</code>, <code>value</code>) can be set using standard DOM methods (such as <code>setAttribute()</code>) or directly to the object. <x-knob id="attrsdom"></x-knob> <x-knob id="attrsdirect"></x-knob></p>
<p id="updatingvalue"><x-knob divisions="0"></x-knob> <x-knob divisions="2"></x-knob> <x-knob divisions="3"></x-knob> <x-knob divisions="4"></x-knob> <x-knob divisions="8"></x-knob> <x-knob divisions="16"></x-knob> Updating the <code>value</code> of a knob that is being rotated may cause drifting. <output id="updatingvalueoutput"></output></p>
<script type="text/javascript">
var eventsdemo = document.getElementById('eventsdemo');
eventsdemo.addEventListener('input', function(ev) {
document.getElementById('oninputvalue').value = ev.target.value;
});
eventsdemo.addEventListener('change', function(ev) {
document.getElementById('onchangevalue').value = ev.target.value;
});
var bubbling = document.getElementById('bubbling'); // This is the <p> element.
var bubbling_handler = function(ev) {
document.getElementById('bubblingoutput').value = ev.type + ' on ' + ev.target.dataset.name;
};
bubbling.addEventListener('input', bubbling_handler);
bubbling.addEventListener('change', bubbling_handler);
document.getElementById('snap').addEventListener('input', function(ev) {
document.getElementById('snapoutput').value = Array.prototype.map.call(
ev.currentTarget.querySelectorAll('x-knob'),
function(x) { return x.value.toFixed(2); }
).join(' | ');
});
document.getElementById('minmax').addEventListener('input', function(ev) {
document.getElementById('minmaxoutput').value = Array.prototype.map.call(
ev.currentTarget.querySelectorAll('x-knob'),
function(x) { return x.value.toFixed(2); }
).join(' | ');
});
document.getElementById('attrs').addEventListener('input', function(ev) {
if (['attrsdivisions', 'attrsmin', 'attrsmax', 'attrsvalue'].indexOf(ev.target.id) > -1) {
var attr = ev.target.id.replace('attrs', '');
document.getElementById('attrsdom').setAttribute(attr, ev.target.value);
document.getElementById('attrsdirect')[attr] = ev.target.value;
}
});
document.getElementById('updatingvalue').addEventListener('input', function(ev) {
// Since .value has a setter function, the following line may cause side-effects.
ev.target.value = ev.target.value;
document.getElementById('updatingvalueoutput').value = Array.prototype.map.call(
ev.currentTarget.querySelectorAll('x-knob'),
function(x) { return x.value.toFixed(2); }
).join(' | ');
});
</script>
</body>
</html>