The parkrun p-index is an unofficial statistic that measures the number of different parkrun events a person has completed a specific number of times. To achieve a p-index of 10, you must have completed at least 10 different parkrun events 10 times each. This script calculates the p-index for a parkrunner and displays it on their results page.
What is a userscript?
A userscript is a small piece of JavaScript that runs in your browser and enhances specific websites. These scripts work with parkrun event pages, parkrunner profile pages, and results pages, and can be used with any userscript manager including Userscripts, Tampermonkey, Violentmonkey, or any compatible browser extension.
Installation
-
Install a userscript manager for your browser:
- Desktop: Userscripts (Safari), Tampermonkey (Chrome, Firefox, Edge, Opera), or Violentmonkey (Orion)
- iOS: Userscripts (Safari) or Violentmonkey (Orion)
- Android: Install Kiwi Browser, then install Tampermonkey or Violentmonkey from the Chrome Web Store.
- Click the install link below for this script.
- Click “Install” when prompted by your userscript manager.
Install parkrun p-index display
Bookmarklet version
You can also use this script as a bookmarklet (a bookmark whose URL is JavaScript), which can be useful on browsers that support bookmarks but not userscript managers.
Desktop bookmarklet
Drag this link to your bookmarks bar:
parkrun p-index display bookmarklet
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e.lastVisitIndex?e.lastVisitIndex:Number.NEGATIVE_INFINITY,score:Math.min(e.count,n)})).sort((e,t)=>t.score!==e.score?t.score-e.score:t.count!==e.count?t.count-e.count:t.lastVisitIndex!==e.lastVisitIndex?t.lastVisitIndex-e.lastVisitIndex:e.eventName.localeCompare(t.eventName)).slice(0,n);let i=[],a=0;var o=new Set(e.map(e=>e.eventName)),s=(t.filter(e=>e.count<n).sort((e,t)=>e.lastVisitIndex!==t.lastVisitIndex?e.lastVisitIndex-t.lastVisitIndex:e.eventName.localeCompare(t.eventName)).forEach(e=>{var t=Math.max(0,n-e.count);i.push({eventName:e.eventName,additionalFinishes:t,isNewEvent:!1}),a+=t}),Math.max(0,n-t.length));let r=1;for(let e=0;e<s;e++){for(;o.has("New event "+r);)r++;var l="New event "+r;o.add(l),i.push({eventName:l,additionalFinishes:n,isNewEvent:!0}),a+=n,r++}return{targetPIndex:n,totalAdditionalFinishes:a,actions:i}}function v(e,t){let n=new Map(e.map(e=>[e.eventName,{count:e.count,lastVisitIndex:"number"==typeof e.lastVisitIndex?e.lastVisitIndex:Number.NEGATIVE_INFINITY}]));e=e.reduce((e,t)=>"number"==typeof t.lastVisitIndex?Math.max(e,t.lastVisitIndex):e,Number.NEGATIVE_INFINITY)+1;let i=Number.isFinite(e)?e:0;return t.forEach(e=>{var t=n.get(e.eventName)||{count:0,lastVisitIndex:Number.NEGATIVE_INFINITY};n.set(e.eventName,{count:t.count+e.additionalFinishes,lastVisitIndex:i+e.additionalFinishes-1}),i+=e.additionalFinishes}),Array.from(n.entries()).map(([e,t])=>({eventName:e,count:t.count,lastVisitIndex:t.lastVisitIndex}))}t.exports={applyPlanToEventCounts:v,buildDifficultyMetrics:function(e,t){var n;return 0===e.length?{latestGap:0,longestGap:0,startLevel:0,endLevel:0,nextTarget:1,nextPlan:{targetPIndex:1,totalAdditionalFinishes:1,actions:[{eventName:"New event 1",additionalFinishes:1,isNewEvent:!0}]},lookaheadTarget:2,lookaheadPlan:{targetPIndex:2,totalAdditionalFinishes:3,actions:[{eventName:"New event 2",additionalFinishes:2,isNewEvent:!0},{eventName:"New event 3",additionalFinishes:1,isNewEvent:!0}]}}:(n=e.filter(e=>e.isJump),e=e[e.length-1],n=n.reduce((e,t)=>!e||t.finishesSincePreviousIncrease>e.finishesSincePreviousIncrease?t:e,null),{latestGap:e.finishesSincePreviousIncrease,longestGap:n?n.finishesSincePreviousIncrease:0,startLevel:n?n.previousPIndex:0,endLevel:n?n.pIndex:0,nextTarget:t+1,nextPlan:e.nextPlan,lookaheadTarget:t+2,lookaheadPlan:e.lookaheadPlan})},buildEventStats:x,calculateMinimumFinishesPlan:h,calculatePIndex:m,calculatePIndexProgression:function(t){var n=[];let i=0,a=0;for(let e=0;e<t.length;e++){var o=t.slice(0,e+1),s=x(o),o=m(p(o)),r=h(s,o+1),s=h(v(s,r.actions),o+2),l=t[e],d=e+1,u=o>i,c=d-a;n.push({finishes:d,date:l.date,eventName:l.eventName,eventNumber:l.eventNumber,pIndex:o,previousPIndex:i,isJump:u,finishesSincePreviousIncrease:c,nextPlan:r,lookaheadPlan:s}),u&&(a=d,i=o)}return n},groupFinishesByEvent:p,parseDateDdMmYyyy:function(e){var[e,t,n]=e.split("/").map(e=>parseInt(e,10));return new Date(n,t-1,e)}}}});e({"src/p-index.user.js"(e,a){{let{calculatePIndex:e,groupFinishesByEvent:t,parseDateDdMmYyyy:o}=u();function s(){return window.innerWidth<768?{isMobile:!0,spacing:{small:"10px"},container:{padding:"10px",marginTop:"10px",width:"100%",maxWidth:"800px",aspectRatio:"auto"},typography:{pIndex:"1.2em",listItem:"0.9em"},listItem:{marginBottom:"5px",textAlign:"left"},button:{padding:"6px 12px",fontSize:"0.9em",marginTop:"10px"}}:{isMobile:!1,spacing:{small:"20px"},container:{padding:"20px",marginTop:"20px",width:"auto",maxWidth:"none",aspectRatio:"1"},typography:{pIndex:"1.5em",listItem:"1em"},listItem:{marginBottom:"8px",textAlign:"center"},button:{padding:"8px 15px",fontSize:"1em",marginTop:"15px"}}}if(void 0!==a&&a.exports&&"undefined"!=typeof globalThis&&globalThis.process&&globalThis.process.versions&&globalThis.process.versions.node)a.exports={buildContributingEvents:d,extractFinishTimeline:n,findResultsTable:i};else{var r,a=i();if(a){a=n(a),a=t(a),r=e(a),a=d(a,r);{let i=s(),e=document.querySelector("h2");if(e){let t=document.createElement("div");t.style.fontSize=i.typography.pIndex,t.style.fontWeight="bold",t.style.marginTop=i.container.marginTop,t.style.backgroundColor="#2b223d",t.style.color="#ffa300",t.style.padding=i.container.padding,t.style.borderRadius="5px",t.style.display="flex",t.style.flexDirection="column",t.style.alignItems="center",t.style.justifyContent="center",t.style.width=i.container.width,t.style.maxWidth=i.container.maxWidth,t.style.marginLeft="auto",t.style.marginRight="auto",t.style.aspectRatio=i.container.aspectRatio,t.setAttribute("id","p-index-display");var l=document.createElement("div");l.textContent="p-index: "+r,t.appendChild(l);let n=document.createElement("ul");n.style.listStyleType="none",n.style.padding="0",n.style.marginTop=i.spacing.small,n.style.width="100%",a.forEach(e=>{var t=document.createElement("li");t.textContent=e,t.style.fontWeight="normal",t.style.fontSize=i.typography.listItem,t.style.marginBottom=i.listItem.marginBottom,t.style.textAlign=i.listItem.textAlign,t.style.wordBreak="break-word",n.appendChild(t)}),t.appendChild(n),(e=>{let t=s(),n=document.createElement("div"),a=(n.style.marginTop=t.button.marginTop,n.id="p-index-download-btn-container",document.createElement("button"));a.textContent="💾 Save as 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e=t.getBoundingClientRect(),e=Math.max(e.width,e.height);t.style.width=e+"px",t.style.height=e+"px"},0)}}}else console.error("Results table not found")}function n(e){let i=[];return e.querySelectorAll("tbody > tr").forEach(e=>{var t=e.querySelector("td:nth-child(1)").textContent.trim(),n=e.querySelector("td:nth-child(2)").textContent.trim(),e=e.querySelector("td:nth-child(3)").textContent.trim();i.push({eventName:t,date:n,eventNumber:e})}),i.sort((e,t)=>o(e.date)-o(t.date))}function i(){var e=document.querySelectorAll("#results");return e[e.length-1]}function d(e,a){return e.slice(0,a).map(([e,t])=>{var n=t[0],i=t[a-1];return{eventName:e,eventCount:t.length,firstDate:n.date,firstEventNumber:n.eventNumber,pIndexDate:i.date,pIndexEventNumber:i.eventNumber,pIndexDateForSorting:o(i.date)}}).sort((e,t)=>e.pIndexDateForSorting-t.pIndexDateForSorting).map(e=>e.eventName+" ("+e.eventCount+"): "+e.firstDate+" (#"+e.firstEventNumber+") - "+e.pIndexDate+" (#"+e.pIndexEventNumber+")")}}}})()})();){kind=link}
Mobile bookmarklet
On mobile browsers that let you edit bookmark URLs:
- Copy the JavaScript code below to your clipboard.
- Create a new bookmark for any page.
- Edit the bookmark and replace its URL with the code you copied.
- Navigate to the relevant parkrun page.
- Select the bookmark to run the script.
javascript:(()=>{var n=Object.getOwnPropertyNames,e=(e,t)=>function(){return t||(0,e[n(e)[0]])((t={exports:{}}).exports,t),t.exports},u=e({"lib/p-index-core.js"(e,t){function p(e){e=e.reduce((e,{eventName:t,date:n,eventNumber:i})=>(e[t]||(e[t]=[]),e[t].push({date:n,eventNumber:i}),e),{});return Object.entries(e).sort((e,t)=>t[1].length-e[1].length)}function m(e){return e.filter(([,e],t)=>e.length>t).length}function x(e){let i=new Map;return e.forEach((e,t)=>{var n=i.get(e.eventName)||{count:0,lastVisitIndex:-1};i.set(e.eventName,{count:n.count+1,lastVisitIndex:t})}),Array.from(i.entries()).map(([e,t])=>({eventName:e,count:t.count,lastVisitIndex:t.lastVisitIndex}))}function h(e,n){var t=e.map(e=>({eventName:e.eventName,count:e.count,lastVisitIndex:"number"==typeof 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3",additionalFinishes:1,isNewEvent:!0}]}}:(n=e.filter(e=>e.isJump),e=e[e.length-1],n=n.reduce((e,t)=>!e||t.finishesSincePreviousIncrease>e.finishesSincePreviousIncrease?t:e,null),{latestGap:e.finishesSincePreviousIncrease,longestGap:n?n.finishesSincePreviousIncrease:0,startLevel:n?n.previousPIndex:0,endLevel:n?n.pIndex:0,nextTarget:t+1,nextPlan:e.nextPlan,lookaheadTarget:t+2,lookaheadPlan:e.lookaheadPlan})},buildEventStats:x,calculateMinimumFinishesPlan:h,calculatePIndex:m,calculatePIndexProgression:function(t){var n=[];let i=0,a=0;for(let e=0;e<t.length;e++){var o=t.slice(0,e+1),s=x(o),o=m(p(o)),r=h(s,o+1),s=h(v(s,r.actions),o+2),l=t[e],d=e+1,u=o>i,c=d-a;n.push({finishes:d,date:l.date,eventName:l.eventName,eventNumber:l.eventNumber,pIndex:o,previousPIndex:i,isJump:u,finishesSincePreviousIncrease:c,nextPlan:r,lookaheadPlan:s}),u&&(a=d,i=o)}return n},groupFinishesByEvent:p,parseDateDdMmYyyy:function(e){var[e,t,n]=e.split("/").map(e=>parseInt(e,10));return new Date(n,t-1,e)}}}});e({"src/p-index.user.js"(e,a){{let{calculatePIndex:e,groupFinishesByEvent:t,parseDateDdMmYyyy:o}=u();function s(){return window.innerWidth<768?{isMobile:!0,spacing:{small:"10px"},container:{padding:"10px",marginTop:"10px",width:"100%",maxWidth:"800px",aspectRatio:"auto"},typography:{pIndex:"1.2em",listItem:"0.9em"},listItem:{marginBottom:"5px",textAlign:"left"},button:{padding:"6px 12px",fontSize:"0.9em",marginTop:"10px"}}:{isMobile:!1,spacing:{small:"20px"},container:{padding:"20px",marginTop:"20px",width:"auto",maxWidth:"none",aspectRatio:"1"},typography:{pIndex:"1.5em",listItem:"1em"},listItem:{marginBottom:"8px",textAlign:"center"},button:{padding:"8px 15px",fontSize:"1em",marginTop:"15px"}}}if(void 0!==a&&a.exports&&"undefined"!=typeof globalThis&&globalThis.process&&globalThis.process.versions&&globalThis.process.versions.node)a.exports={buildContributingEvents:d,extractFinishTimeline:n,findResultsTable:i};else{var r,a=i();if(a){a=n(a),a=t(a),r=e(a),a=d(a,r);{let i=s(),e=document.querySelector("h2");if(e){let t=document.createElement("div");t.style.fontSize=i.typography.pIndex,t.style.fontWeight="bold",t.style.marginTop=i.container.marginTop,t.style.backgroundColor="#2b223d",t.style.color="#ffa300",t.style.padding=i.container.padding,t.style.borderRadius="5px",t.style.display="flex",t.style.flexDirection="column",t.style.alignItems="center",t.style.justifyContent="center",t.style.width=i.container.width,t.style.maxWidth=i.container.maxWidth,t.style.marginLeft="auto",t.style.marginRight="auto",t.style.aspectRatio=i.container.aspectRatio,t.setAttribute("id","p-index-display");var l=document.createElement("div");l.textContent="p-index: "+r,t.appendChild(l);let n=document.createElement("ul");n.style.listStyleType="none",n.style.padding="0",n.style.marginTop=i.spacing.small,n.style.width="100%",a.forEach(e=>{var 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e=t.getBoundingClientRect(),e=Math.max(e.width,e.height);t.style.width=e+"px",t.style.height=e+"px"},0)}}}else console.error("Results table not found")}function n(e){let i=[];return e.querySelectorAll("tbody > tr").forEach(e=>{var t=e.querySelector("td:nth-child(1)").textContent.trim(),n=e.querySelector("td:nth-child(2)").textContent.trim(),e=e.querySelector("td:nth-child(3)").textContent.trim();i.push({eventName:t,date:n,eventNumber:e})}),i.sort((e,t)=>o(e.date)-o(t.date))}function i(){var e=document.querySelectorAll("#results");return e[e.length-1]}function d(e,a){return e.slice(0,a).map(([e,t])=>{var n=t[0],i=t[a-1];return{eventName:e,eventCount:t.length,firstDate:n.date,firstEventNumber:n.eventNumber,pIndexDate:i.date,pIndexEventNumber:i.eventNumber,pIndexDateForSorting:o(i.date)}}).sort((e,t)=>e.pIndexDateForSorting-t.pIndexDateForSorting).map(e=>e.eventName+" ("+e.eventCount+"): "+e.firstDate+" (#"+e.firstEventNumber+") - "+e.pIndexDate+" (#"+e.pIndexEventNumber+")")}}}})()})();