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🎨 Palette: Improve button loading state #17

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🎨 Palette: Improve button loading state #17

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11 changes: 5 additions & 6 deletions web_app/static/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -116,7 +116,10 @@ <h2 id="contentHeading">Lyrics</h2>
</div>
</div>

<button id="generateBtn" class="primary-btn">Generate Poster</button>
<button id="generateBtn" class="primary-btn">
<span class="btn-text">Generate Poster</span>
<div class="btn-spinner"></div>
</button>
</div>
</div>

Expand All @@ -143,11 +146,7 @@ <h2>Poster</h2>
</main>
</div>
<div id="toastContainer" class="toast-container"></div>
<div id="loadingOverlay" class="loading-overlay" style="display: none;">
<div class="spinner"></div>
<p>Generating your masterpiece...</p>
</div>
<script src="/static/script.js?v=21"></script>
<script src="/static/script.js?v=22"></script>
</body>

</html>
18 changes: 13 additions & 5 deletions web_app/static/script.js
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,6 @@ const startLineInput = document.getElementById('startLine');
const endLineInput = document.getElementById('endLine');
const themeInput = document.getElementById('themeInput');
const fontInput = document.getElementById('fontInput');
const loadingOverlay = document.getElementById('loadingOverlay');

let currentMetadata = null;
let searchDebounceTimer = null;
Expand Down Expand Up @@ -613,7 +612,8 @@ function handleLyricLineClick(lineNumber) {
async function generatePoster() {
if (!currentMetadata) return;

loadingOverlay.style.display = 'flex';
generateBtn.disabled = true;
generateBtn.classList.add('loading');

const indexingToggle = document.getElementById('indexingToggle');
const accentToggle = document.getElementById('accentToggle');
Expand All @@ -635,8 +635,9 @@ async function generatePoster() {
const end = endVal;

if (isNaN(start) || isNaN(end) || start >= end) {
loadingOverlay.style.display = 'none';
showToast("Please enter a valid range (Start must be less than End).", "error");
generateBtn.disabled = false;
generateBtn.classList.remove('loading');
return;
}

Expand Down Expand Up @@ -669,13 +670,20 @@ async function generatePoster() {
posterContainer.innerHTML = '';
posterContainer.appendChild(img);
showDownloadButton(imageUrl, data.filename);
loadingOverlay.style.display = 'none';
generateBtn.disabled = false;
generateBtn.classList.remove('loading');
};
img.onerror = () => {
showToast('Failed to load generated poster.', 'error');
generateBtn.disabled = false;
generateBtn.classList.remove('loading');
};

} catch (error) {
console.error("Generation failed", error);
showToast(`Error: ${error.message}`, "error");
loadingOverlay.style.display = 'none';
generateBtn.disabled = false;
generateBtn.classList.remove('loading');
}
}

Expand Down
41 changes: 39 additions & 2 deletions web_app/static/style.css
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Expand Up @@ -645,8 +645,11 @@ input:focus {
}

@keyframes spin {
from {
transform: translate(-50%, -50%) rotate(0deg);
}
to {
transform: rotate(360deg);
transform: translate(-50%, -50%) rotate(360deg);
}
}

Expand Down Expand Up @@ -908,4 +911,38 @@ input:focus {

.result-action svg {
pointer-events: none;
}
}
/* --- Button Loading State --- */
.primary-btn {
position: relative; /* Anchor for spinner */
}

.primary-btn:disabled {
opacity: 0.65;
cursor: not-allowed;
transform: none; /* Cancel hover effect */
background-color: var(--accent-color);
}

.primary-btn.loading .btn-text {
visibility: hidden;
opacity: 0;
}

.btn-spinner {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 24px;
height: 24px;
border: 3px solid rgba(26, 26, 31, 0.2); /* Use a darker transparent for contrast on the accent bg */
border-top-color: #1a1a1f; /* Match button text color */
border-radius: 50%;
animation: spin 0.8s linear infinite;
display: none; /* Hidden by default */
}

.primary-btn.loading .btn-spinner {
display: block;
}