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Add processing spinner and progress indicator #1

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Add processing spinner and progress indicator #1

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ec24bc4
Add processing indicator for file parsing
azaitsev Feb 4, 2026
3dc400d
Guard processing indicator when no files
azaitsev Feb 4, 2026
3034243
Hide processing indicator on initial load
azaitsev Feb 4, 2026
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41 changes: 37 additions & 4 deletions src/static/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,14 @@
input[type="checkbox"] { transform: scale(1.1); }
.row { display: grid; grid-template-columns: 1fr; gap: 16px; }
.card { border: 1px solid #e5e5e5; border-radius: 10px; padding: 12px; }
.hidden { display: none; }
.processingStatus { display: flex; flex-direction: column; gap: 6px; margin-top: 8px; }
.processingRow { display: flex; align-items: center; gap: 8px; }
.spinner { width: 14px; height: 14px; border: 2px solid #cfcfcf; border-top-color: #444; border-radius: 50%; animation: spin 0.9s linear infinite; }
.progressBar { position: relative; height: 6px; background: #f0f0f0; border-radius: 999px; overflow: hidden; }
.progressBar::after { content: ""; position: absolute; left: -40%; width: 40%; height: 100%; background: #4c7ed9; animation: progress 1.2s ease-in-out infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes progress { 50% { left: 60%; } 100% { left: 120%; } }
</style>
</head>
<body>
Expand All @@ -42,6 +50,14 @@
</div>
</div>

<div id="processingStatus" class="processingStatus hidden" aria-live="polite" hidden>
<div class="processingRow">
<div class="spinner" aria-hidden="true"></div>
<div id="processingMessage" class="muted"></div>
</div>
<div id="processingProgressBar" class="progressBar" role="progressbar" aria-valuetext="Processing"></div>
</div>

<div id="filesList"></div>
<div id="filesError" class="error"></div>
</div>
Expand Down Expand Up @@ -89,6 +105,9 @@
enableAllBtn: document.querySelector("#enableAllBtn"),
disableAllBtn: document.querySelector("#disableAllBtn"),
clearBtn: document.querySelector("#clearBtn"),
processingStatus: document.querySelector("#processingStatus"),
processingMessage: document.querySelector("#processingMessage"),
processingProgressBar: document.querySelector("#processingProgressBar"),
};

const SUPPORTED_METRICS = ["hr_bpm", "speed_kmh", "power_w"];
Expand Down Expand Up @@ -118,6 +137,21 @@
ui.filesError.textContent = text || "";
}

function setProcessingState(isProcessingFiles, processingMessageText, processingFilesCount) {
const processingIndicatorShouldBeVisible = isProcessingFiles && processingFilesCount > 0;
if (processingIndicatorShouldBeVisible) {
ui.processingStatus.removeAttribute("hidden");
ui.processingStatus.classList.remove("hidden");
ui.processingMessage.textContent = processingMessageText || "Processing files";
ui.processingProgressBar.setAttribute("aria-valuetext", ui.processingMessage.textContent);
} else {
ui.processingStatus.classList.add("hidden");
ui.processingStatus.setAttribute("hidden", "");
ui.processingMessage.textContent = "";
ui.processingProgressBar.setAttribute("aria-valuetext", "");
}
}

function escapeHtml(text) {
const div = document.createElement("div");
div.textContent = text;
Expand Down Expand Up @@ -241,7 +275,7 @@
ui.clearBtn.disabled = true;

try {
setStatus(`Parsing ${filesToParse.length} file(s)`);
setProcessingState(true, `Processing ${filesToParse.length} file(s)`, filesToParse.length);
const result = await fetchParsedSeries(filesToParse);
const lookup = buildSeriesLookup(result);

Expand All @@ -263,11 +297,10 @@

renderFilesList();
await updateChartsFromState();
setStatus("");
} catch (err) {
setStatus("");
setError(err instanceof Error ? err.message : "Parse error");
} finally {
setProcessingState(false, "", 0);
ui.addFilesBtn.disabled = false;
ui.enableAllBtn.disabled = false;
ui.disableAllBtn.disabled = false;
Expand Down Expand Up @@ -323,4 +356,4 @@
renderFilesList();
</script>
</body>
</html>
</html>