yumoqing
1291f7fee3
When valueField/textField are not explicitly set in opts, the auto-select logic (line 1140) and nullable empty-option creation (lines 1144-1145) used data[0][undefined] which returned undefined, causing: - Single-option selects to show blank (auto-select failed) - nullable empty options to have undefined keys Now extracts vf/tf local variables with ||'value'/||'text' fallback at the top of build_options(), used consistently throughout.
57 lines
3.4 KiB
Markdown
57 lines
3.4 KiB
Markdown
# VScrollPanel
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**Control Function**: Vertical scroll panel, used to provide vertical scrolling capability when content exceeds the container height. It also supports triggering threshold events when scrolling approaches the top or bottom.
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**Type**: Container control
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**Parent Control**: `bricks.VBox`
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## Initialization Parameters
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| Parameter | Type | Description |
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|---------|------|-------------|
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| `min_threshold` | Number (optional) | Threshold ratio at which the `min_threshold` event is triggered when the scrollbar approaches the top. Default is `0.02` (i.e., 2%) |
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| `max_threshold` | Number (optional) | Threshold ratio at which the `max_threshold` event is triggered when the scrollbar approaches the bottom. Default is `0.95` (i.e., 95%) |
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| `width` | String | Defaults to `'100%'`, meaning the control occupies the full width of its parent container |
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| `height` | String | Defaults to `'100%'`, meaning the control occupies the full height of its parent container |
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| `css` | String (optional) | Custom CSS class name; the class `'scrollpanel'` will be added in addition |
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| `overflow` | String | Fixed as `'auto'`, enabling automatic display of scrollbars |
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> Note: The above `width`, `height`, `css`, and `overflow` properties are automatically set in the constructor.
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## Main Events
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- **`min_threshold`**
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Triggered when the vertical scroll position approaches the top (determined by `min_threshold`). Typically indicates that the user has scrolled to the very top, useful for actions such as loading more content.
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- **`max_threshold`**
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Triggered when the vertical scroll position approaches the bottom (determined by `max_threshold`). Commonly used to implement "infinite scroll" or "load more on reaching end" functionality.
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---
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# HScrollPanel
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**Control Function**: Horizontal scroll panel, used to provide horizontal scrolling capability when content exceeds the container width. It can trigger threshold events when scrolling approaches the far left or right edges.
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**Type**: Container control
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**Parent Control**: `bricks.HBox`
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## Initialization Parameters
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| Parameter | Type | Description |
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|---------|------|-------------|
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| `min_threshold` | Number (optional) | Threshold ratio at which the `min_threshold` event is triggered when the horizontal scrollbar approaches the left edge. Default is `0.01` (i.e., 1%) |
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| `max_threshold` | Number (optional) | Threshold ratio at which the `max_threshold` event is triggered when the horizontal scrollbar approaches the right edge. Default is `0.99` (i.e., 99%) |
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| `width` | String | Defaults to `'100%'`, meaning the control occupies the full width of its parent container |
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| `height` | String | Defaults to `'100%'`, meaning the control occupies the full height of its parent container |
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| `css` | String (optional) | Custom CSS class name; will be combined with the `'scrollpanel'` class |
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| `overflow` | String | Fixed as `'auto'`, allowing horizontal scrollbar to appear when needed |
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> Note: `width`, `height`, `css`, and `overflow` are automatically configured by the constructor.
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## Main Events
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- **`min_threshold`**
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Triggered when the horizontal scroll position approaches the far left. Can be used to load additional content on the left or execute other logic.
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- **`max_threshold`**
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Triggered when the horizontal scroll position approaches the far right. Suitable for implementing "load more on horizontal scroll" scenarios. |