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51
rangevote.html
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51
rangevote.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<title>POST DEMO</title>
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</head>
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<body>
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<form id="my-form" action="/range_vote" method="post" oninput=UpdateValues(event)>
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This page is an experiment in voting. Half of the people who visit this site vote using Plurality Voting
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where a voter selects their top candidate, and the winner is the candidate with the most votes. The other
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half use Range Voting where voters score all familiar candidates based on how happy they would be should
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that candidate win. You have been randomly selected to vote using Range Voting.
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<br>
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<br>
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<table>
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<tr>
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<th>Candidate</th>
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<th><span id="spanid"> </th>
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<th>Happiness</th>
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</tr>
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<!-- INJECT0 -->
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</table>
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<br>
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<button type="submit" value="submit">Submit</button>
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</form>
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</body>
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<script>
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function CanId(c)
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{
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let w=c.split(" ");
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let lastname=w[w.length-1].toLowerCase();
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let id=lastname.split("-");
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let rval=id[id.length-1];
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return(rval);
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}
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function UpdateValues(event)
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{
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let id=event.srcElement.id;
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console.log(id);
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let slider=document.getElementById(id);
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let output=document.getElementById('o-'+CanId(id));
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if (slider.value==-1) output.innerHTML="No Opinion";
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else output.innerHTML=slider.value+"%";
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}
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</script>
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141
rangevote.js
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141
rangevote.js
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var express = require('express')
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var bodyParser = require('body-parser')
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var fs=require('fs')
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var app = express()
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var Candidates=[ "Chris Christie", "Ron DeSantis", "Nikki Haley", "Mike Pence",
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"Vivek Ramaswamy", "Tim Scott", "Donald Trump" ];
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function CanId(c)
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{
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let w=c.split(" ");
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let lastname=w[w.length-1].toLowerCase();
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let id=lastname.split("-");
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let rval=id[id.length-1];
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return(rval);
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}
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// Set up data structures for Range Votes and Plur Votes
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var RangeVotes=new Map();
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var RangePower=new Map();
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var RangeResult=new Map();
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var PlurVotes=new Map();
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var PlurResult=new Map();
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for (let c of Candidates)
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{
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let k=CanId(c);
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let v=RangePower.get(k);
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if (typeof(v)!='number' || v==NaN || v==Infinity) RangePower.set(k,0);
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v=RangeResult.get(k);
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if (typeof(v)!='number' || v==NaN || v==Infinity) RangeResult.set(k,0);
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v=PlurResult.get(k);
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if (typeof(v)!='number' || v==NaN || v==Infinity) PlurResult.set(k,0);
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}
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// Construct the static page for range voting
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var TheHTML="";
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for (let c of Candidates)
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{
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TheHTML=TheHTML+' <tr>'+
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' <td>'+c+'</td><td><input type="range" min="-1" max="100" value="-1" id="i-'+CanId(c)+'" name="n-'+CanId(c)+'" /></td><td><span id="o-'+CanId(c)+'">No Opinion</span></td></tr>\n';
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}
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var TemplateHTML=fs.readFileSync("rangevote.html").toString();
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var TemplateSearch="<!-- INJECT0 -->";
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var TemplateIndex=TemplateHTML.indexOf(TemplateSearch);
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TheHTML=TemplateHTML.substr(0,TemplateIndex)+TheHTML+TemplateHTML.substr(TemplateIndex+TemplateSearch.length,1000000);
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// create application/json parser
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var jsonParser = bodyParser.json()
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// create application/x-www-form-urlencoded parser
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var urlencodedParser = bodyParser.urlencoded({ extended: false })
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app.get('/', (req, res) => {
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res.send(TheHTML);
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})
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function lerp(a,b,c,d,e)
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{
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if (a<b) a=b;
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if (a>c) a=c;
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let rval=d+(a-b)*(e-d)/(c-b);
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return(rval);
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}
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function PlurVote(ip,NewChoice)
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{
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let OldChoice=PlurResult.get(ip);
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if (typeof(OldChoice)=='string') PlurResult.set(OldChoice,PlurResult.get(OldChoice)-1);
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if (typeof(NewChoice)=='string') PlurResult.set(NewChoice,PlurResult.get(NewChoice)+1);
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}
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function AddToRangeResult(vote,mult=1)
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{
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console.log("RangeResult Before "+mult);
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console.log(RangeResult);
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console.log("RangePower Before "+mult);
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console.log(RangePower);
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for (let[key,val] of vote) if (key) if (val>=0)
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{
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RangeResult.set(key,RangeResult.get(key)+val*mult);
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RangePower.set(key,RangePower.get(key)+mult);
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}
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console.log("RangeResult After "+mult);
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console.log(RangeResult);
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console.log("RangePower After "+mult);
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console.log(RangePower);
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}
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function RangeVote(ip,entries)
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{
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let r0=null,r1=null;
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for (let [key,val] of entries) if (typeof(key)=="string" && val>=0)
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{
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if (r0) r0=Math.min(r0,val); else r0=val;
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if (r1) r1=Math.max(r1,val); else r1=val;
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}
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if (r1<=r0) return;
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let NewVote=new Map()
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for (let [key,val] of entries) if (typeof(key)=="string")
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{
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let id=CanId(key);
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console.log(key+' '+id);
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let norm=Math.round(lerp(val,r0,r1,0,100));
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if (val>=0) NewVote.set(id,norm);
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}
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let OldVote=RangeVotes.get(ip);
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// if (OldVote) AddToRangeResult(OldVote,-1);
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console.log("NewVote");
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console.log(NewVote);
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RangeVotes.set(ip,NewVote);
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AddToRangeResult(NewVote,1);
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}
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// POST /login gets urlencoded bodies
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app.post('/range_vote', urlencodedParser, function (req, res) {
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RangeVote(req.socket.remoteAddress,Object.entries(req.body));
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let str="Results:<br>";
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for (let c of Candidates)
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{
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let key=CanId(c);
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if (RangePower.get(key)>0) str=str+c+': '+Math.round(RangeResult.get(key)/RangePower.get(key))+'<br>';
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}
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res.send(str);
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})
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app.post('/plur_vote', urlencodedParser, function (req, res) {
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// PlurVote(req.socket.remoteAddress,Object.entries(req.body));
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res.send("Your Plurality Vote Counted!!!");
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})
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app.listen(3000,function(req,res) { console.log("Listening for connections"); })
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