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WIP: Conditional Logic
This is a WIP implementation of Conditional Logic. It is not well tested, and I would appreciate review and testing by others to see if it works as intended. I have created a few forms and clicked around to the best of my abilities, but I have implemented the fix for the benefit of others that need it and have no real use case myself to test with. Fixes: #358 Signed-off-by: Micke Nordin <kano@sunet.se>
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‎docs/DataStructure.md‎

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<!--
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- SPDX-FileCopyrightText: 2021 Nextcloud GmbH and Nextcloud contributors
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- SPDX-FileCopyrightText: 2021-2026 Nextcloud GmbH and Nextcloud contributors
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- SPDX-License-Identifier: AGPL-3.0-only
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-->
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@@ -227,6 +227,7 @@ Currently supported Question-Types are:
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| `file` | One or multiple files. It is possible to specify which mime types are allowed |
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| `linearscale` | A linear or Likert scale question where you choose an option that best fits your opinion |
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| `color` | A color answer, hex string representation (e. g. `#123456`) |
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| `conditional` | A conditional branching question with a trigger question and multiple branches containing subquestions |
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## Extra Settings
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@@ -254,3 +255,189 @@ Optional extra settings for some [Question Types](#question-types)
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| `optionsHighest` | `linearscale` | Integer | `2, 3, 4, 5, 6, 7, 8, 9, 10` | Set the highest value of the scale, default: `5` |
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| `optionsLabelLowest` | `linearscale` | string | - | Set the label of the lowest value, default: `'Strongly disagree'` |
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| `optionsLabelHighest` | `linearscale` | string | - | Set the label of the highest value, default: `'Strongly agree'` |
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| `triggerType` | `conditional` | string | [See trigger types](#conditional-trigger-types) | The type of trigger question (dropdown, multiple_unique, etc.) |
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| `branches` | `conditional` | Array | Array of [Branch objects](#branch-object) | The branches with conditions and subquestions |
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## Conditional Questions
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Conditional questions enable branching logic in forms. A trigger question determines which branch of subquestions appears based on the respondent's answer.
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### Question Properties for Subquestions
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Subquestions (questions belonging to a conditional question's branch) have additional properties:
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| Property | Type | Description |
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| ---------------- | ------- | -------------------------------------------------------- |
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| parentQuestionId | Integer | The ID of the parent conditional question (null for regular questions) |
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| branchId | String | The ID of the branch this subquestion belongs to |
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### Conditional Trigger Types
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Supported trigger types for conditional questions:
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| Trigger Type | Condition Type | Description |
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| ----------------- | -------------------- | ------------------------------------------------ |
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| `multiple_unique` | `option_selected` | Radio buttons - single option selection |
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| `dropdown` | `option_selected` | Dropdown - single option selection |
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| `multiple` | `options_combination`| Checkboxes - all specified options must be selected |
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| `short` | `string_equals`, `string_contains`, `regex` | Short text with string/regex matching |
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| `long` | `string_contains`, `regex` | Long text with string/regex matching |
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| `linearscale` | `value_equals`, `value_range` | Linear scale with value matching |
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| `date` | `date_range` | Date with date range matching (YYYY-MM-DD) |
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| `time` | `time_range` | Time with time range matching (HH:mm) |
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| `color` | `value_equals` | Color with exact value matching |
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| `file` | `file_uploaded` | File with upload status matching |
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### Branch Object
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A branch defines conditions and subquestions that appear when those conditions are met.
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| Property | Type | Description |
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| ------------ | ------------------------------------------- | --------------------------------------------- |
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| id | String | Unique identifier for the branch |
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| conditions | Array of [Conditions](#condition-object) | Conditions that must be met to show the branch|
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| subQuestions | Array of [Questions](#question) | Questions shown when conditions are met |
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```json
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{
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"id": "branch-1705587600000",
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"conditions": [
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{ "type": "option_selected", "optionId": 42 }
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],
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"subQuestions": [
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{
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"id": 101,
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"formId": 3,
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"order": 1,
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"type": "short",
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"text": "Please provide details",
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"parentQuestionId": 100,
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"branchId": "branch-1705587600000"
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}
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]
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}
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```
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### Condition Object
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Conditions determine when a branch is activated. The structure depends on the trigger type.
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#### option_selected (for dropdown, multiple_unique)
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```json
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{ "type": "option_selected", "optionId": 42 }
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```
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#### options_combination (for multiple/checkboxes)
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```json
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{ "type": "options_combination", "optionIds": [42, 43] }
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```
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All options in `optionIds` must be selected for the branch to activate (AND logic).
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#### string_equals (for short text)
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```json
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{ "type": "string_equals", "value": "yes" }
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```
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#### string_contains (for short, long text)
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```json
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{ "type": "string_contains", "value": "keyword" }
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```
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#### regex (for short, long text)
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```json
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{ "type": "regex", "value": "^yes.*" }
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```
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#### value_equals (for color)
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```json
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{ "type": "value_equals", "value": "#ff0000" }
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```
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#### value_range (for linearscale, time)
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```json
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{ "type": "value_range", "min": 3, "max": 5 }
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```
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#### date_range (for date)
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```json
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{ "type": "date_range", "min": "2024-01-01", "max": "2024-12-31" }
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```
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#### time_range (for time)
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```json
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{ "type": "time_range", "min": "09:00", "max": "17:00" }
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```
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#### file_uploaded (for file)
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```json
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{ "type": "file_uploaded", "fileUploaded": true }
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```
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### Conditional Question Example
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A complete conditional question structure:
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```json
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{
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"id": 100,
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"formId": 3,
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"order": 1,
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"type": "conditional",
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"isRequired": true,
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"text": "Do you have any dietary restrictions?",
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"options": [
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{ "id": 42, "questionId": 100, "order": 1, "text": "Yes" },
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{ "id": 43, "questionId": 100, "order": 2, "text": "No" }
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],
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"extraSettings": {
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"triggerType": "dropdown",
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"branches": [
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{
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"id": "branch-yes",
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"conditions": [{ "type": "option_selected", "optionId": 42 }],
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"subQuestions": [
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{
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"id": 101,
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"formId": 3,
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"order": 1,
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"type": "long",
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"text": "Please describe your dietary restrictions",
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"parentQuestionId": 100,
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"branchId": "branch-yes"
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}
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]
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}
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]
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}
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}
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```
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### Conditional Answer Structure
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When submitting or storing conditional question answers, the structure differs from regular questions:
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```json
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{
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"100": {
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"trigger": ["42"],
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"subQuestions": {
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"101": ["Vegetarian, no nuts"]
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}
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}
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}
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```
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| Property | Type | Description |
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| ------------ | --------------------------- | ----------------------------------------------------- |
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| trigger | Array of strings | Answer values for the trigger question |
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| subQuestions | Object (questionId → Array) | Map of subquestion IDs to their answer value arrays |

‎lib/Constants.php‎

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<?php
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/**
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* SPDX-FileCopyrightText: 2021 Nextcloud GmbH and Nextcloud contributors
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* SPDX-FileCopyrightText: 2021-2026 Nextcloud GmbH and Nextcloud contributors
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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// Available AnswerTypes
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public const ANSWER_TYPE_COLOR = 'color';
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public const ANSWER_TYPE_CONDITIONAL = 'conditional';
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public const ANSWER_TYPE_DATE = 'date';
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public const ANSWER_TYPE_DATETIME = 'datetime';
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public const ANSWER_TYPE_DROPDOWN = 'dropdown';
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// All AnswerTypes
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public const ANSWER_TYPES = [
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self::ANSWER_TYPE_COLOR,
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self::ANSWER_TYPE_CONDITIONAL,
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self::ANSWER_TYPE_DATE,
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self::ANSWER_TYPE_DATETIME,
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self::ANSWER_TYPE_DROPDOWN,
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'optionsLabelHighest' => ['string', 'NULL'],
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];
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/**
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* Extra settings for conditional questions
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* - triggerType: The question type used for the trigger (e.g., 'multiple_unique', 'dropdown', 'short')
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* - branches: Array of branch definitions, each containing:
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* - id: Unique branch identifier
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* - conditions: Array of condition objects defining when this branch is active
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* For predefined types: [{ optionId: number }]
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* For text types: [{ type: 'string_equals'|'string_contains'|'regex', value: string }]
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* For numeric/scale: [{ type: 'value_equals'|'value_range', value: number, min?: number, max?: number }]
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*/
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public const EXTRA_SETTINGS_CONDITIONAL = [
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'triggerType' => ['string'],
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'branches' => ['array'],
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];
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/**
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* Condition types for conditional questions
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*/
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public const CONDITION_TYPE_OPTION_SELECTED = 'option_selected';
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public const CONDITION_TYPE_OPTIONS_COMBINATION = 'options_combination';
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public const CONDITION_TYPE_STRING_EQUALS = 'string_equals';
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public const CONDITION_TYPE_STRING_CONTAINS = 'string_contains';
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public const CONDITION_TYPE_REGEX = 'regex';
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public const CONDITION_TYPE_VALUE_EQUALS = 'value_equals';
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public const CONDITION_TYPE_VALUE_RANGE = 'value_range';
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public const CONDITION_TYPE_DATE_RANGE = 'date_range';
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public const CONDITION_TYPE_FILE_UPLOADED = 'file_uploaded';
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public const CONDITION_TYPES = [
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self::CONDITION_TYPE_OPTION_SELECTED,
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self::CONDITION_TYPE_OPTIONS_COMBINATION,
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self::CONDITION_TYPE_STRING_EQUALS,
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self::CONDITION_TYPE_STRING_CONTAINS,
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self::CONDITION_TYPE_REGEX,
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self::CONDITION_TYPE_VALUE_EQUALS,
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self::CONDITION_TYPE_VALUE_RANGE,
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self::CONDITION_TYPE_DATE_RANGE,
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self::CONDITION_TYPE_FILE_UPLOADED,
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];
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/**
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* Trigger types allowed for conditional questions
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* Maps each trigger type to its supported condition types
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*/
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public const CONDITIONAL_TRIGGER_TYPES = [
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self::ANSWER_TYPE_MULTIPLEUNIQUE => [self::CONDITION_TYPE_OPTION_SELECTED],
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self::ANSWER_TYPE_DROPDOWN => [self::CONDITION_TYPE_OPTION_SELECTED],
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self::ANSWER_TYPE_MULTIPLE => [self::CONDITION_TYPE_OPTIONS_COMBINATION],
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self::ANSWER_TYPE_SHORT => [self::CONDITION_TYPE_STRING_EQUALS, self::CONDITION_TYPE_STRING_CONTAINS, self::CONDITION_TYPE_REGEX],
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self::ANSWER_TYPE_LONG => [self::CONDITION_TYPE_STRING_CONTAINS, self::CONDITION_TYPE_REGEX],
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self::ANSWER_TYPE_LINEARSCALE => [self::CONDITION_TYPE_VALUE_EQUALS, self::CONDITION_TYPE_VALUE_RANGE],
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self::ANSWER_TYPE_DATE => [self::CONDITION_TYPE_DATE_RANGE],
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self::ANSWER_TYPE_DATETIME => [self::CONDITION_TYPE_DATE_RANGE],
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self::ANSWER_TYPE_TIME => [self::CONDITION_TYPE_VALUE_RANGE],
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self::ANSWER_TYPE_COLOR => [self::CONDITION_TYPE_VALUE_EQUALS],
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self::ANSWER_TYPE_FILE => [self::CONDITION_TYPE_FILE_UPLOADED],
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];
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public const FILENAME_INVALID_CHARS = [
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"\n",
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'/',

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