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| 1 | +# Button onClick Fix: Lazy Loading Custom Buttons |
| 2 | + |
| 3 | +## Problem |
| 4 | + |
| 5 | +**Issue:** Custom buttons in scripts (like "Cập nhật dữ liệu" in `chongLuaDao.js`) were not clickable after implementing lazy loading optimization. |
| 6 | + |
| 7 | +**Root Cause:** |
| 8 | +- Scripts can define custom buttons with `onClick` handlers: |
| 9 | + ```javascript |
| 10 | + buttons: [ |
| 11 | + { |
| 12 | + icon: updateIcon, |
| 13 | + name: { vi: "Cập nhật dữ liệu", en: "Update database" }, |
| 14 | + onClick: onEnable // Function reference |
| 15 | + } |
| 16 | + ] |
| 17 | + ``` |
| 18 | +- During metadata extraction, the `buttons` array is copied to metadata |
| 19 | +- When `JSON.stringify()` is called, the `onClick` functions are lost (functions cannot be serialized) |
| 20 | +- Popup loads metadata with button structure but no `onClick` functions |
| 21 | +- Clicking button does nothing because `btnConfig.onClick()` is `undefined` |
| 22 | + |
| 23 | +**Affected Scripts:** 9 scripts with custom buttons: |
| 24 | +- `auto_lockWebsite.js` |
| 25 | +- `auto_redirectLargestImageSrc.js` |
| 26 | +- `chongLuaDao.js` |
| 27 | +- `createInvisibleText.js` |
| 28 | +- `magnify_image.js` |
| 29 | +- `remove_tracking_in_url.js` |
| 30 | +- `screenshotVisiblePage.js` |
| 31 | +- `smoothScroll.js` |
| 32 | +- `web_timer.js` |
| 33 | + |
| 34 | +## Solution |
| 35 | + |
| 36 | +### Implementation in `popup/index.js` |
| 37 | + |
| 38 | +Updated button click handler to lazy load full script and execute onClick from the full script: |
| 39 | + |
| 40 | +```javascript |
| 41 | +// Before (BROKEN): |
| 42 | +btn.onclick = (e) => { |
| 43 | + // ... |
| 44 | + btnConfig.onClick(); // undefined in metadata! |
| 45 | +}; |
| 46 | + |
| 47 | +// After (FIXED): |
| 48 | +btn.onclick = async (e) => { |
| 49 | + // ... |
| 50 | + |
| 51 | + // Special case: infoLink button has inline onClick |
| 52 | + if (btnConfig._isInfoLink && btnConfig.onClick) { |
| 53 | + btnConfig.onClick(); |
| 54 | + return; |
| 55 | + } |
| 56 | + |
| 57 | + // ⚡ LAZY LOAD: Load full script to get onClick function |
| 58 | + try { |
| 59 | + const fullScript = await loadFullScript(script.id); |
| 60 | + |
| 61 | + // Calculate correct index (account for infoLink button) |
| 62 | + const fullScriptBtnIndex = hasInfoLink ? btnIndex - 1 : btnIndex; |
| 63 | + const fullBtnConfig = fullScript.buttons?.[fullScriptBtnIndex]; |
| 64 | + |
| 65 | + if (fullBtnConfig?.onClick && typeof fullBtnConfig.onClick === 'function') { |
| 66 | + await fullBtnConfig.onClick(); |
| 67 | + } else { |
| 68 | + console.error(`Button onClick not found in script ${script.id}`); |
| 69 | + } |
| 70 | + } catch (error) { |
| 71 | + console.error(`Failed to execute button onClick for ${script.id}:`, error); |
| 72 | + } |
| 73 | +}; |
| 74 | +``` |
| 75 | +
|
| 76 | +### Key Changes |
| 77 | +
|
| 78 | +1. **Lazy Load Full Script:** |
| 79 | + - When button is clicked, dynamically load the full script using `loadFullScript(scriptId)` |
| 80 | + - Cache loaded scripts for future clicks |
| 81 | +
|
| 82 | +2. **Index Calculation:** |
| 83 | + - Account for dynamically added `infoLink` button |
| 84 | + - If `infoLink` exists, it's inserted at index 0, so custom buttons are shifted by +1 |
| 85 | + - Use `fullScriptBtnIndex = hasInfoLink ? btnIndex - 1 : btnIndex` to get correct index in full script |
| 86 | +
|
| 87 | +3. **Special Case Handling:** |
| 88 | + - `infoLink` button has inline onClick: `() => window.open(script.infoLink)` |
| 89 | + - Mark it with `_isInfoLink: true` flag |
| 90 | + - Execute inline onClick directly without lazy loading |
| 91 | +
|
| 92 | +4. **Error Handling:** |
| 93 | + - Try-catch to handle loading failures |
| 94 | + - Log errors with script ID and index for debugging |
| 95 | +
|
| 96 | +## Example Flow |
| 97 | +
|
| 98 | +**User clicks "Cập nhật dữ liệu" button in `chongLuaDao` script:** |
| 99 | +
|
| 100 | +1. ✅ Button click event fires |
| 101 | +2. ✅ Prevent default and track analytics |
| 102 | +3. ✅ Check if it's special infoLink button (no) |
| 103 | +4. ✅ Lazy load full `chongLuaDao.js` script |
| 104 | +5. ✅ Calculate index: `btnIndex = 0` (no infoLink) → `fullScriptBtnIndex = 0` |
| 105 | +6. ✅ Get `fullScript.buttons[0]` → has `onClick: onEnable` |
| 106 | +7. ✅ Execute `await onEnable()` |
| 107 | +8. ✅ Function runs successfully (downloads database) |
| 108 | +
|
| 109 | +## Benefits |
| 110 | +
|
| 111 | +✅ **Custom buttons work** - All 9 scripts with custom buttons now functional |
| 112 | +✅ **Maintains lazy loading** - Only loads script when button is clicked |
| 113 | +✅ **Proper error handling** - Clear error messages for debugging |
| 114 | +✅ **Index alignment** - Correctly handles infoLink button offset |
| 115 | +✅ **No performance impact** - Script cached after first load |
| 116 | +
|
| 117 | +## Testing |
| 118 | +
|
| 119 | +**Test scripts with custom buttons:** |
| 120 | +
|
| 121 | +1. **chongLuaDao.js:** |
| 122 | + - Click "Cập nhật dữ liệu" button |
| 123 | + - Should download and display database statistics |
| 124 | +
|
| 125 | +2. **web_timer.js:** |
| 126 | + - Check custom timer buttons work |
| 127 | +
|
| 128 | +3. **auto_lockWebsite.js:** |
| 129 | + - Verify lock/unlock buttons function |
| 130 | +
|
| 131 | +4. **Verify in popup:** |
| 132 | + ``` |
| 133 | + 1. Open extension popup |
| 134 | + 2. Find script with custom button (e.g., chongLuaDao) |
| 135 | + 3. Click custom button |
| 136 | + 4. Verify action executes correctly |
| 137 | + ``` |
| 138 | +
|
| 139 | +## Files Changed |
| 140 | +
|
| 141 | +``` |
| 142 | +Modified: |
| 143 | +└── popup/index.js (lines 335-387) |
| 144 | + ├── Added hasInfoLink flag tracking |
| 145 | + ├── Marked infoLink button with _isInfoLink |
| 146 | + ├── Updated button onclick to lazy load full script |
| 147 | + └── Added index calculation for correct button mapping |
| 148 | +``` |
| 149 | +
|
| 150 | +## Technical Notes |
| 151 | +
|
| 152 | +### Why Not Store onClick in Metadata? |
| 153 | +
|
| 154 | +**Option 1 (NOT USED):** Serialize function as string, eval() at runtime |
| 155 | +- ❌ Security risk (eval is dangerous) |
| 156 | +- ❌ Loses closure context |
| 157 | +- ❌ Hard to debug |
| 158 | +
|
| 159 | +**Option 2 (CHOSEN):** Lazy load full script on click |
| 160 | +- ✅ Secure (no eval) |
| 161 | +- ✅ Preserves function context and closures |
| 162 | +- ✅ Easy to debug |
| 163 | +- ✅ Leverages existing lazy loading system |
| 164 | +
|
| 165 | +### Index Offset Edge Cases |
| 166 | +
|
| 167 | +| Scenario | scriptBtns | fullScript.buttons | Calculation | |
| 168 | +|----------|-----------|-------------------|-------------| |
| 169 | +| No infoLink, 1 custom button | `[btn0]` | `[btn0]` | `btnIndex = 0` → `fullScriptBtnIndex = 0` ✅ | |
| 170 | +| Has infoLink, 1 custom button | `[infoLink, btn0]` | `[btn0]` | `btnIndex = 1` → `fullScriptBtnIndex = 0` ✅ | |
| 171 | +| Has infoLink, 2 custom buttons | `[infoLink, btn0, btn1]` | `[btn0, btn1]` | `btnIndex = 2` → `fullScriptBtnIndex = 1` ✅ | |
| 172 | +
|
| 173 | +--- |
| 174 | +
|
| 175 | +**Date:** 2025-11-06 |
| 176 | +**Issue:** Custom button onClick not working after lazy loading |
| 177 | +**Solution:** Lazy load full script when button clicked |
| 178 | +**Status:** ✅ COMPLETE |
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