Lenient 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. Lenient 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").
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Node
- Category:
utils - Display name:
Lenient Switch - Class:
LenientSwitch
Inputs
| Slot | Required | Purpose |
|---|---|---|
source_a |
yes | Pass-through source (any type) |
source_b, source_c, source_d, source_e |
no | Additional pass-through sources |
pass_if_a … pass_if_e |
no | Per-slot truthiness test (not a CONDITIONING input). 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.
Simple Selector (Switch)
- Category:
utils - Display name:
Simple Selector (Switch) - Class:
SimpleSelectorSwitch
A no-condition switch: instead of evaluating truthiness, you explicitly pick which source to forward from a dropdown. Each slot also carries a free-form label (a memo), and the chosen slot's label is re-emitted as a second output — handy for things like building a filename from the active choice.
Inputs
| Input | Required | Purpose |
|---|---|---|
select |
yes | Dropdown none / A / B / C / D / E — which source to forward. none forwards nothing |
label_a … label_e |
yes | Single-line per-slot memo (e.g. SDXL base). Not used for any flow decision; only the selected slot's label is re-emitted |
block_on_none_selected |
yes | When select is none, emit an ExecutionBlocker (on both outputs) to skip downstream nodes instead of passing None |
source_a … source_e |
no | Pass-through sources (any type). Wire only the slots you use |
Outputs
| Output | Type | Meaning |
|---|---|---|
output |
any | The source_X of the selected slot. None if select is none (or ExecutionBlocker if block_on_none_selected is ON), or if the selected slot's source is unconnected |
label |
STRING | The selected slot's label. Empty when select is none |
The selector is ComfyUI's stock dropdown — it gives "exactly one, or none" semantics natively with no extra UI. Selecting a slot whose source_X is unconnected returns None (it does not block); only select = none triggers the blocker.
Prompt Tabs
- Category:
utils - Display name:
Prompt Tabs - Class:
PromptTabs
A notepad-style text node that keeps any number of named prompt tabs in a single box and outputs the text of the currently-active tab. Switch tabs to keep alternate prompts around without deleting them — handy when experimenting and you want to jump back to an earlier prompt.
| Action | How |
|---|---|
| Switch tab | Click the tab |
| Add tab | Click + (tabs can grow without limit; they wrap onto multiple rows) |
| Rename tab | Double-click the tab |
| Delete tab | Click the × on the tab — asks for confirmation first (at least one tab always remains) |
Outputs:
| Output | Type | Meaning |
|---|---|---|
text |
STRING | The content of the active tab |
label |
STRING | The name of the active tab (Tab 1, Tab 2, or whatever you renamed it to) |
This node ships a small JavaScript widget (in web/), so it needs a ComfyUI
version that loads custom-node frontends. If the frontend fails to load it
degrades to a plain multiline text box.
Installation
Clone into your ComfyUI custom_nodes directory:
cd ComfyUI/custom_nodes
git clone https://github.com/id-fa/ComfyUI-Lenient-Switch
Restart ComfyUI. No additional dependencies required.