Loose Switch
A ComfyUI custom node that lets you route any value through a switch while specifying the condition separately from the pass-through source.
Most switch nodes force you to choose a slot based on the same value you forward downstream. Loose Switch decouples those: each slot has its own optional condition input. If a condition is connected, it decides whether that slot wins; if not, the source itself is used for the test. This makes it easy to gate one signal on the truthiness of another (e.g. "forward the image when the mask is non-empty", "pick a prompt based on a flag").
Node
- Category:
utils - Display name:
Loose Switch - Class:
LooseSwitch
Inputs
| Slot | Required | Purpose |
|---|---|---|
source_a, source_b |
yes | Pass-through sources (any type) |
source_c, source_d, source_e |
no | Additional pass-through sources |
condition_a … condition_e |
no | Per-slot truthiness test. If unconnected, the matching source_X is used as the condition |
Toggles (required):
| Toggle | Default | Effect when ON |
|---|---|---|
treat_zero_as_false |
true | Numeric 0 / 0.0 is falsy |
treat_empty_string_as_false |
true | "" is falsy |
evaluate_boolean |
true | Booleans use their actual value. When OFF, booleans are always truthy |
treat_empty_list_as_false |
true | Empty list / tuple is falsy |
block_on_all_false |
false | When every slot is falsy, emit an ExecutionBlocker on the output socket to stop downstream execution |
None is always falsy. Values that don't match any falsy rule are truthy.
Outputs
| Output | Type | Meaning |
|---|---|---|
output |
any | The source_X of the first slot whose condition is truthy. None if all slots are falsy (or ExecutionBlocker if block_on_all_false is ON) |
matched |
BOOLEAN | True if a slot matched, False otherwise (always False when all slots are falsy, including the blocker case) |
Evaluation order
Slots are tested in the order A → B → C → D → E. Slots whose source_X is not connected (C/D/E only) are skipped. The first slot whose condition evaluates truthy wins, and its source_X value is forwarded.
Installation
Clone into your ComfyUI custom_nodes directory:
cd ComfyUI/custom_nodes
git clone https://github.com/id-fa/ComfyUI-Loose-Switch
Restart ComfyUI. No additional dependencies required.