> For the complete documentation index, see [llms.txt](https://docs.appfarm.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.appfarm.io/library/action-nodes/if.md).

# If

Control under which circumstances an Action Node or a set of nodes should be executed. You may add conditions to the `IF` node, and you may add Action Nodes as children of the `IF` node. If the condition is evaluated as `true`, all Action Nodes inside will trigger. You may also add `IF` nodes inside another `IF` node, for more complex evaluation or control of the Action flow.

To handle more than one condition, add **Else if** and **Else** blocks to the same node:

* **Else if**: Only evaluated if the conditions above it (the `IF` block and any earlier **Else if** blocks) evaluate to `false`. If its own condition evaluates to `true`, the Action Nodes inside it run.
* **Else**: A fallback block with no condition of its own. Its Action Nodes run only if none of the conditions above it evaluated to `true`.

Blocks are evaluated from top to bottom, and only the first block whose condition evaluates to `true` runs — the rest are skipped.

{% hint style="warning" %}
**Important**

**Else if** and **Else** blocks are only available on the `IF` action node in [flows](/reference/flows.md). They aren't available in apps or services.
{% endhint %}

### Properties

The `IF` block, and each **Else if** block, requires only a Condition to be set up.

* Data Binding: Select a property (must be a boolean type property) holding TRUE or FALSE. The block will evaluate to TRUE depending on the property you select for Data Binding.
* Condition: Use the [Condition Editor](/reference/platform-concepts/conditions.md) to set up a logical expression. The block will evaluate to TRUE is this expression evaluates to TRUE.
* Function: Use the [Function Editor](/reference/platform-concepts/functions.md) to set up an advanced expression. You may use Javascript inside the Function Editor. The function must return either TRUE or FALSE.

### Add Else if and Else blocks

Hover over the `IF` block, or an existing **Else if** block, to reveal its toolbar. Click **+** and select **Add Else if block** or **Add Else block**.

* You can add any number of **Else if** blocks.
* You can add only one **Else** block. It's always evaluated last, after every **Else if** block.
* Use the up and down arrows in the toolbar to reorder **Else if** blocks and change the order they're evaluated in.

{% hint style="info" %}
**Good to know**

Since blocks are evaluated top to bottom and only the first matching block runs, the order of your **Else if** blocks matters if their conditions overlap.
{% endhint %}


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