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🎨 Palette: Add loading state to Generate button #27

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🎨 Palette: Add loading state to Generate button #27

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5 changes: 4 additions & 1 deletion 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="button-spinner" style="display: none;"></div>
</button>
</div>
</div>

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29 changes: 23 additions & 6 deletions web_app/static/script.js
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Original file line number Diff line number Diff line change
Expand Up @@ -613,7 +613,16 @@ function handleLyricLineClick(lineNumber) {
async function generatePoster() {
if (!currentMetadata) return;

loadingOverlay.style.display = 'flex';
const btnText = generateBtn.querySelector('.btn-text');
const btnSpinner = generateBtn.querySelector('.button-spinner');

const resetButtonState = () => {
generateBtn.disabled = false;
generateBtn.classList.remove('loading');
if(btnText) btnText.textContent = 'Generate Poster';
if(btnSpinner) btnSpinner.style.display = 'none';
generateBtn.removeAttribute('aria-label');
};

const indexingToggle = document.getElementById('indexingToggle');
const accentToggle = document.getElementById('accentToggle');
Expand All @@ -628,14 +637,12 @@ async function generatePoster() {
};

if (payload.type === 'track') {
// Lyrics Logic (Same as before)
const startVal = parseInt(startLineInput.value) || 1;
const endVal = parseInt(endLineInput.value) || 1;
const start = startVal - 1;
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");
return;
}
Expand All @@ -644,10 +651,16 @@ async function generatePoster() {
payload.lyrics_end = end;

} else {
// Album Logic
payload.indexing = indexingToggle ? indexingToggle.checked : false;
}

// Set loading state AFTER validation
generateBtn.disabled = true;
generateBtn.classList.add('loading');
if(btnText) btnText.textContent = 'Generating...';
if(btnSpinner) btnSpinner.style.display = 'block';
generateBtn.setAttribute('aria-label', 'Generating poster, please wait');

try {
const response = await fetch('/api/generate', {
method: 'POST',
Expand All @@ -669,13 +682,17 @@ async function generatePoster() {
posterContainer.innerHTML = '';
posterContainer.appendChild(img);
showDownloadButton(imageUrl, data.filename);
loadingOverlay.style.display = 'none';
resetButtonState();
};
img.onerror = () => {
showToast('Error: Failed to load the generated poster image.', 'error');
resetButtonState();
};

} catch (error) {
console.error("Generation failed", error);
showToast(`Error: ${error.message}`, "error");
loadingOverlay.style.display = 'none';
resetButtonState();
}
}

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22 changes: 22 additions & 0 deletions web_app/static/style.css
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Original file line number Diff line number Diff line change
Expand Up @@ -166,6 +166,28 @@ header p {
transform: translateY(-1px);
}

.primary-btn:disabled {
background: var(--surface-elevated);
color: var(--text-muted);
cursor: not-allowed;
transform: none;
}

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

.button-spinner {
position: absolute;
width: 20px;
height: 20px;
border: 2px solid rgba(0, 0, 0, 0.2);
border-top-color: var(--surface-base);
border-radius: 50%;
animation: spin 0.8s linear infinite;
}

.secondary-btn {
background: transparent;
border-color: var(--border-color);
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