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Donordrive Display
<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link href="" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<script src="" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>
/* local css here */
#donation-sums { position: absolute; align-self: center; }
#donation-bar { width: 100%; /* position: relative; top: 100px; left: 100px; */ }
<div class="container-fluid">
<div style="display: flex;">
<div style="width: min-content;">
<div id="donation-sum"></div>
<div style="width: 100%;">
<div id="donation-bar">
<div class="progress">
<div class="progress-bar progress-bar-striped" role="progressbar" style="width: 0%" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100"></div>
<div style="width: min-content;">
<div id="donation-goal"></div>
const baseUrl = "";
const pollIntervalMs = 15000;
let lastEtag = null;
// queries the DonorDrive API and calls the updateCallback if the data has changed
function queryApi(baseUrl, updateCallback) {
// I'm too dumb to pass both the json data and the etag through the promise,
// so keep it in this local variable
let etag = null;
// cache argument should take care of ETag etc
fetch(baseUrl, {cache: "no-cache"})
.then((response) => {
if (!response.ok)
throw new Error(response.status);
etag = response.headers.get("Etag");
return response.json();
.then((participant) => {
console.debug("etag", etag);
// use etag of participant endpoint to determine changes
// see
if (etag != lastEtag) {
// when the etag has changed, fetch other data and update
lastEtag = etag; // only store new etag when the update was successful
.catch((err) => {
// TODO: handle error. indicate on layout?
// format to a currency string like "$1,234", will round to two fraction digits
function formatMoney(value) {
return value.toLocaleString('en-US', { style: 'currency', currency: 'USD', minimumFractionDigits: 0, maximumFractionDigits: 2 });
// this function is called when new data is coming in
function updateUI(participant) {
// participant:
console.debug("update", participant);
let barPercentage = Math.min(100, (participant.sumDonations / participant.fundraisingGoal) * 100);
console.debug("progress", participant.sumDonations, participant.fundraisingGoal, barPercentage);
// update progress bar
let barElement = document.querySelector("#donation-bar .progress-bar"); = barPercentage+'%';
barElement.ariaValueNow = barPercentage;
document.querySelector("#donation-sum").textContent = formatMoney(participant.sumDonations);
document.querySelector("#donation-goal").textContent = formatMoney(participant.fundraisingGoal);
setInterval(queryApi, pollIntervalMs, baseUrl);
queryApi(baseUrl); // make the first request immediately, setInterval only triggers after the interval
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