This JavaScript code creates a spinning wheel with options and questions for interactive selection. It utilizes D3.js for visualization. The wheel spins randomly and stops on a choice. This is helpful for games or selecting random options interactively.
You can use this code on your website for interactive decision-making or game features. It adds engagement and interactivity to your platform, enhancing user experience. The spinning wheel feature offers a fun way for users to make selections or choices.
How to Create JavaScript Spin Wheel
1. Start by creating the HTML structure for the spin wheel. Include a <div> element with an ID of “chart” where the spin wheel will be rendered.
<div id="chart"></div> <div id="question"><h1></h1></div>
2. Define CSS styles to customize the appearance of the spin wheel. This step is optional but helps enhance the visual appeal of the wheel.
text{
font-family:Helvetica, Arial, sans-serif;
font-size:11px;
pointer-events:none;
}
#chart{
position: absolute;
width:500px;
height:500px;
top:0;
left:0;
margin-left: 440px;
margin-top: 400px;
}
#question{
position: absolute;
width:400px;
height:500px;
top:0;
left:520px;
}
#question h1{
font-size: 50px;
font-weight: bold;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
position: absolute;
padding: 0;
margin: 0;
top:50%;
-webkit-transform:translate(0,-50%);
transform:translate(0,-50%);
}
3. Load the following d3js CDN link before closing the body tag:
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
4. Now, let’s write the JavaScript code to create the spin wheel functionality. Copy and paste the following JavaScript code into your script file or inside <script> tags in your HTML file.
var padding = {top:20, right:40, bottom:0, left:0},
w = 500 - padding.left - padding.right,
h = 500 - padding.top - padding.bottom,
r = Math.min(w, h)/2,
rotation = 0,
oldrotation = 0,
picked = 100000,
oldpick = [],
color = d3.scale.category20();//category20c()
//randomNumbers = getRandomNumbers();
//http://osric.com/bingo-card-generator/?title=HTML+and+CSS+BINGO!&words=padding%2Cfont-family%2Ccolor%2Cfont-weight%2Cfont-size%2Cbackground-color%2Cnesting%2Cbottom%2Csans-serif%2Cperiod%2Cpound+sign%2C%EF%B9%A4body%EF%B9%A5%2C%EF%B9%A4ul%EF%B9%A5%2C%EF%B9%A4h1%EF%B9%A5%2Cmargin%2C%3C++%3E%2C{+}%2C%EF%B9%A4p%EF%B9%A5%2C%EF%B9%A4!DOCTYPE+html%EF%B9%A5%2C%EF%B9%A4head%EF%B9%A5%2Ccolon%2C%EF%B9%A4style%EF%B9%A5%2C.html%2CHTML%2CCSS%2CJavaScript%2Cborder&freespace=true&freespaceValue=Web+Design+Master&freespaceRandom=false&width=5&height=5&number=35#results
var data = [
{"label":"Dell LAPTOP", "value":1, "question":"What CSS property is used for specifying the area between the content and its border?"}, // padding
{"label":"IMAC PRO", "value":2, "question":"What CSS property is used for changing the font?"}, //font-family
{"label":"SUZUKI", "value":3, "question":"What CSS property is used for changing the color of text?"}, //color
{"label":"HONDA", "value":4, "question":"What CSS property is used for changing the boldness of text?"}, //font-weight
{"label":"FERRARI", "value":5, "question":"What CSS property is used for changing the size of text?"}, //font-size
{"label":"APARTMENT", "value":6, "question":"What CSS property is used for changing the background color of a box?"}, //background-color
{"label":"IPAD PRO", "value":7, "question":"Which word is used for specifying an HTML tag that is inside another tag?"}, //nesting
{"label":"LAND", "value":8, "question":"Which side of the box is the third number in: margin:1px 1px 1px 1px; ?"}, //bottom
{"label":"MOTOROLLA", "value":9, "question":"What are the fonts that don't have serifs at the ends of letters called?"}, //sans-serif
{"label":"BMW", "value":10, "question":"With CSS selectors, what character prefix should one use to specify a class?"}
];
var svg = d3.select('#chart')
.append("svg")
.data([data])
.attr("width", w + padding.left + padding.right)
.attr("height", h + padding.top + padding.bottom);
var container = svg.append("g")
.attr("class", "chartholder")
.attr("transform", "translate(" + (w/2 + padding.left) + "," + (h/2 + padding.top) + ")");
var vis = container
.append("g");
var pie = d3.layout.pie().sort(null).value(function(d){return 1;});
// declare an arc generator function
var arc = d3.svg.arc().outerRadius(r);
// select paths, use arc generator to draw
var arcs = vis.selectAll("g.slice")
.data(pie)
.enter()
.append("g")
.attr("class", "slice");
arcs.append("path")
.attr("fill", function(d, i){ return color(i); })
.attr("d", function (d) { return arc(d); });
// add the text
arcs.append("text").attr("transform", function(d){
d.innerRadius = 0;
d.outerRadius = r;
d.angle = (d.startAngle + d.endAngle)/2;
return "rotate(" + (d.angle * 180 / Math.PI - 90) + ")translate(" + (d.outerRadius -10) +")";
})
.attr("text-anchor", "end")
.text( function(d, i) {
return data[i].label;
});
container.on("click", spin);
function spin(d){
container.on("click", null);
//all slices have been seen, all done
console.log("OldPick: " + oldpick.length, "Data length: " + data.length);
if(oldpick.length == data.length){
console.log("done");
container.on("click", null);
return;
}
var ps = 360/data.length,
pieslice = Math.round(1440/data.length),
rng = Math.floor((Math.random() * 1440) + 360);
rotation = (Math.round(rng / ps) * ps);
picked = Math.round(data.length - (rotation % 360)/ps);
picked = picked >= data.length ? (picked % data.length) : picked;
if(oldpick.indexOf(picked) !== -1){
d3.select(this).call(spin);
return;
} else {
oldpick.push(picked);
}
rotation += 90 - Math.round(ps/2);
vis.transition()
.duration(3000)
.attrTween("transform", rotTween)
.each("end", function(){
//mark question as seen
d3.select(".slice:nth-child(" + (picked + 1) + ") path")
.attr("fill", "#111");
//populate question
d3.select("#question h1")
.text(data[picked].question);
oldrotation = rotation;
/* Get the result value from object "data" */
console.log(data[picked].value)
/* Comment the below line for restrict spin to sngle time */
container.on("click", spin);
});
}
//make arrow
svg.append("g")
.attr("transform", "translate(" + (w + padding.left + padding.right) + "," + ((h/2)+padding.top) + ")")
.append("path")
.attr("d", "M-" + (r*.15) + ",0L0," + (r*.05) + "L0,-" + (r*.05) + "Z")
.style({"fill":"black"});
//draw spin circle
container.append("circle")
.attr("cx", 0)
.attr("cy", 0)
.attr("r", 60)
.style({"fill":"white","cursor":"pointer"});
//spin text
container.append("text")
.attr("x", 0)
.attr("y", 15)
.attr("text-anchor", "middle")
.text("SPIN")
.style({"font-weight":"bold", "font-size":"30px"});
function rotTween(to) {
var i = d3.interpolate(oldrotation % 360, rotation);
return function(t) {
return "rotate(" + i(t) + ")";
};
}
function getRandomNumbers(){
var array = new Uint16Array(1000);
var scale = d3.scale.linear().range([360, 1440]).domain([0, 100000]);
if(window.hasOwnProperty("crypto") && typeof window.crypto.getRandomValues === "function"){
window.crypto.getRandomValues(array);
console.log("works");
} else {
//no support for crypto, get crappy random numbers
for(var i=0; i < 1000; i++){
array[i] = Math.floor(Math.random() * 100000) + 1;
}
}
return array;
}
That’s all! hopefully, you have successfully created the Javascript Spin Wheel. If you have any questions or suggestions, feel free to comment below.
