> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pads4.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Rules properties

Page rules allow your page to **automatically respond to predefined situations** during playback. This enables dynamic content handling, such as skipping a page when there's no data or proceeding to the next page after videos have finished.

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## **Predefined Rules**

### 1. **Skip this Page when there is No External Data**

If enabled, **the page will be skipped** when:

* **All connected data providers return no data.**
* Filters applied to data providers result in **empty datasets**.
* Row settings on elements **do not match** available data rows.
* Data scrolling is enabled but **no data is available**.

**Key behaviors:**

* All data providers, filters, rows, and scrolling settings are checked.
* If **no valid data is found**, the page will **automatically skip to the next one**.
* **Warning**: If the presentation contains **only one page**, and that page is skipped due to this rule, **the entire presentation may become invisible** during playback.

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### 2. **Play all Videos once and Show the Next Page**

When enabled, **all video/sound elements on the page will play fully**, and then **the next page will be shown** automatically.

**Key behaviors:**

* **Ignores the page's Duration** property.
* Plays **entire video/audio playlists** before proceeding.
* If video/audio elements are linked to data sources, only the **initial retrieved playlist** will be used — **updated data won't affect current playback**.
* **Preferred** for pages with multiple media elements to ensure **synchronized playback and transition**.
* **Note**: If set at the page level, individual "Play once and go to next page" settings on elements are ignored.

**Tip**: Ideal for ensuring **advertiser commercials** or **promotional content** is fully shown before moving to the next screen.

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### 3. **Scroll Data Once and Show the Next Page**

When enabled, once the page's **data scrolling** completes (i.e., **all rows are shown**), the page will **automatically advance** to the next one.

**Key behaviors:**

* Only works when **data scrolling is handled at the page level** (general timer option).
* **Not compatible** with elements that have **their own duration cycles**.
* When multiple elements on the page have this setting, **PADS4 will wait until all are finished** before proceeding.
* If used with other timed elements (like video playlists), **combine rules appropriately** to avoid conflicts.

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## **Custom Rules (Rules Section)**

* **Define custom page rules** to adjust page properties dynamically based on certain conditions (e.g., show page only when specific data is present).
* **Custom rules** allow complex logic and greater control over how and when a page is displayed or hidden.

**Important**:\
For detailed information about creating custom rules, see **Working with rules** in the documentation.

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## **Summary of Predefined Rules:**

| Rule                                              | Description                                         | When to Use                                  |
| ------------------------------------------------- | --------------------------------------------------- | -------------------------------------------- |
| **Skip this Page when there is No External Data** | Skips page if data providers return no data.        | To avoid empty data pages.                   |
| **Play all Videos once and Show the Next Page**   | Shows page until all videos/sounds finish playing.  | For media-heavy pages, e.g., advertisements. |
| **Scroll Data Once and Show the Next Page**       | Advances when all data rows are scrolled/displayed. | For dynamic lists or data tables.            |