🧩 Conditions & Rules (GUI Editor)

The “Conditions and Rules” tab in the form settings is the more modern, visual editor for field logic — showing/hiding fields, making fields mandatory dynamically, calculating values, filtering options. It is the recommended method for most use cases.

> ⚠️ Beta status: The feature is live, but we are still testing edge cases. If a specific setup does not behave as expected: send a quick email to hello@propform.io with the form ID — we’ll look into it.

Contents

• Available actions
• Conditional operators
• Calculations between fields (calculate value)
• One-way vs. two-way conditions
• Priorities for multiple rules
• Typical setups

Available actions

For each rule, you select an action that is executed when the condition is met:

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Conditional operators

Conditions check the value of another field. Available operators:

• ist gleich / ist nicht gleich
• ist leer / ist nicht leer
• enthält / enthält nicht (for multi-select & text fields)
• ist größer als / ist kleiner als (for numbers)
• ist größer-gleich / ist kleiner-gleich

Multiple conditions per rule are linked using AND (all must apply) or OR (one is sufficient) — selectable per rule.

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Calculations between fields (Calculate value)

With the “Calculate value” action, you can arithmetically combine values from multiple fields — e.g. automatically calculate an internal commission from the purchase price and commission percentage.

The formula uses pipe syntax with field IDs:

{{multiply:field:125802|field:125803|/100}}

→ multiplies the values from field ID 125802 and field ID 125803, then divides the result by 100.

Step by step

Example setup: Three fields in the form — Kaufpreis (number field), Prozent Innenprovision (number field), Summe Innenprovision (number field).

1. Find the field IDs

The field ID is the DOM ID of the <input> element in the form. Here’s how to find it:

• Open the form in your browser
• Right-click on the relevant field → Inspect
• In the DevTools panel, expand the surrounding <div> — the field ID is listed in the ID property (e.g. 125802)
• Note down the IDs of all three fields

2. Create a rule

‘Conditions and Rules’ tab → New rule:

• Condition: Kaufpreis is not empty AND Prozent Innenprovision is not empty
• Action: Calculate value → Field Summe Innenprovision
• Formula in the Value field:

{{multiply:field:<ID-Kaufpreis>|field:<ID-Provisions-Prozent>|/100}}

3. Live test

Open form → Enter purchase price → Enter commission percentage → Total is calculated automatically.

Pipe syntax operators

Operators are chained together using the pipe |:

field: vs. field_value:

For pure numeric fields, field: and field_value: return the same result — both work.

Use Cases

• Internal commission calculator: Purchase price × percentage ÷ 100
• Yield calculation: (Rental income − costs) ÷ investment amount × 100
• Gross/net conversion: Net × 1.19
• Price per square metre: Price ÷ floor area
• Residual value calculation (developer mode, combinable in multiple stages)

> 💡 UX note: The current setup using DevTools IDs and pipe syntax isn’t particularly intuitive. A visual formula editor is on the roadmap.

## One-way vs. two-way conditions

Most actions are applied sticky (one-way) — once the condition has been met, the effect remains, even if the condition becomes false again. Only a few actions automatically revert to their original state (two-way).

> 💡 For actions that are One-Way: if you want to undo them, you need a second rule with the inverse condition to restore the original state. Example: One rule shows the field, a second rule hides it again.

Priorities when multiple rules apply

If multiple rules affect the same field (e.g. Rule 1 sets the value to X, Rule 2 sets the value to Y), the priority decides:

• Higher number = higher priority
• In the event of a tie: the later rule in the editor takes precedence

> 💡 Best practice: Assign priorities in increments of 10 (10, 20, 30, …) so that you can insert rules in between later.

Typical setups

“Marketing type changes → Adjust label”

• Condition: Vermarktungsart = Miete
• Action: Field Kaufpreis → Change label to Kaltmiete
• Action 2: Field Kaufpreis → Add suffix (€/Monat)

“If commission-free → Hide commission fields”

• Condition: Provisionsfrei = Ja
• Action: Fields Provision Außen, Provisions-Prozent, MwSt. → Hide

“Buyer name must be filled in for sales contracts”

• Condition: Vertragsart = Kaufvertrag
• Action: Fields Käufer-Vorname + Käufer-Nachname → Required fields

“Calculate internal commission automatically”

• Condition: Kaufpreis is not empty AND Provisions-Prozent is not empty
• Action: Field Summe Innenprovision → Calculate value → {{multiply:field:KAUFPREIS_ID|field:PROZENT_ID|/100}}

“Filter single-select options based on another field”

• Condition: Bundesland = Bayern
• Action: Field Region → Hide options → all except the Bavarian regions

Related

• 📖 Calculated fields & special field types — Range slider, auto-complete
• 📖 Fields — all types & options — Master overview
• 📖 Auto-Submit & Routing — _calculate(IF(...)) for thank-you page URLs