Conditional Logic

docs/DataStructure.md

@@ -1,5 +1,5 @@
 <!--
-  - SPDX-FileCopyrightText: 2021 Nextcloud GmbH and Nextcloud contributors
+  - SPDX-FileCopyrightText: 2021-2026 Nextcloud GmbH and Nextcloud contributors
   - SPDX-License-Identifier: AGPL-3.0-only
 -->
 
@@ -238,6 +238,7 @@ Currently supported Question-Types are:
 | `linearscale`     | A linear or Likert scale question where you choose an option that best fits your opinion                                                                                          |
 | `color`           | A color answer, hex string representation (e. g. `#123456`)                                                                                                                       |
 | `ranking`         | Using pre-defined options, the user ranks them from most to least preferred. Needs at least one option available. Answers are stored in ranked order (one answer row per option). |
+| `conditional`     | A conditional branching question with a trigger question and multiple branches containing subquestions                                                                            |
 
 ## Extra Settings
 
@@ -280,3 +281,188 @@ Supported option types and their intended usage.
 | `column` | Represents a column header when rendering options in a grid-style question.                |
 
 `row` and `column` option types are primarily used together with `grid` question types to build a two-dimensional selection matrix. `choice` is the default for normal option lists.
+| `triggerType` | `conditional` | string | [See trigger types](#conditional-trigger-types) | The type of trigger question (dropdown, multiple_unique, etc.) |
+| `branches` | `conditional` | Array | Array of [Branch objects](#branch-object) | The branches with conditions and subquestions |
+
+## Conditional Questions
+
+Conditional questions enable branching logic in forms. A trigger question determines which branch of subquestions appears based on the respondent's answer.
+
+### Question Properties for Subquestions
+
+Subquestions (questions belonging to a conditional question's branch) have additional properties:
+
+| Property         | Type    | Description                                                            |
+| ---------------- | ------- | ---------------------------------------------------------------------- |
+| parentQuestionId | Integer | The ID of the parent conditional question (null for regular questions) |
+| branchId         | String  | The ID of the branch this subquestion belongs to                       |
+
+### Conditional Trigger Types
+
+Supported trigger types for conditional questions:
+
+| Trigger Type      | Condition Type                                                                                 | Description                                   |
+| ----------------- | ---------------------------------------------------------------------------------------------- | --------------------------------------------- |
+| `multiple_unique` | `option_selected`, `option_not_selected`                                                       | Radio buttons - single option selection       |
+| `dropdown`        | `option_selected`, `option_not_selected`                                                       | Dropdown - single option selection            |
+| `multiple`        | `option_selected`, `option_not_selected`, `options_combination`                                | Checkbox - option or combination matching     |
+| `short`           | `string_equals`, `string_not_equals`, `string_contains`, `string_not_contains`, `regex`        | Short text - string or regex matching         |
+| `long`            | `string_contains`, `string_not_contains`, `regex`                                              | Long text - string or regex matching          |
+| `linearscale`     | `value_equals`, `value_not_equals`, `value_range`, `value_min`, `value_max`                    | Linear scale - numeric value matching         |
+| `date`            | `date_equals`, `date_before`, `date_after`, `date_range`                                       | Date - exact or range matching (`YYYY-MM-DD`) |
+| `time`            | `time_equals`, `time_before`, `time_after`, `time_range`                                       | Time - exact or range matching (`HH:mm`)      |
+| `color`           | `value_equals`                                                                                 | Color - exact value matching                  |
+| `file`            | `file_uploaded`, `file_not_uploaded`, `filename_contains`, `filename_equals`, `filename_regex` | File - upload status or filename matching     |
+
+### Branch Object
+
+A branch defines conditions and subquestions that appear when those conditions are met.
+
+| Property     | Type                                     | Description                                    |
+| ------------ | ---------------------------------------- | ---------------------------------------------- |
+| id           | String                                   | Unique identifier for the branch               |
+| conditions   | Array of [Conditions](#condition-object) | Conditions that must be met to show the branch |
+| subQuestions | Array of [Questions](#question)          | Questions shown when conditions are met        |
+
+```json
+{
+	"id": "branch-1705587600000",
+	"conditions": [{ "type": "option_selected", "optionId": 42 }],
+	"subQuestions": [
+		{
+			"id": 101,
+			"formId": 3,
+			"order": 1,
+			"type": "short",
+			"text": "Please provide details",
+			"parentQuestionId": 100,
+			"branchId": "branch-1705587600000"
+		}
+	]
+}
+```
+
+### Condition Object
+
+Conditions determine when a branch is activated. The structure depends on the trigger type.
+
+#### option_selected (for dropdown, multiple_unique)
+
+```json
+{ "type": "option_selected", "optionId": 42 }
+```
+
+#### options_combination (for multiple/checkboxes)
+
+```json
+{ "type": "options_combination", "optionIds": [42, 43] }
+```
+
+All options in `optionIds` must be selected for the branch to activate (AND logic).
+
+#### string_equals (for short text)
+
+```json
+{ "type": "string_equals", "value": "yes" }
+```
+
+#### string_contains (for short, long text)
+
+```json
+{ "type": "string_contains", "value": "keyword" }
+```
+
+#### regex (for short, long text)
+
+```json
+{ "type": "regex", "value": "^yes.*" }
+```
+
+#### value_equals (for color)
+
+```json
+{ "type": "value_equals", "value": "#ff0000" }
+```
+
+#### value_range (for linearscale, time)
+
+```json
+{ "type": "value_range", "min": 3, "max": 5 }
+```
+
+#### date_range (for date)
+
+```json
+{ "type": "date_range", "min": "2024-01-01", "max": "2024-12-31" }
+```
+
+#### time_range (for time)
+
+```json
+{ "type": "time_range", "min": "09:00", "max": "17:00" }
+```
+
+#### file_uploaded (for file)
+
+```json
+{ "type": "file_uploaded", "fileUploaded": true }
+```
+
+### Conditional Question Example
+
+A complete conditional question structure:
+
+```json
+{
+	"id": 100,
+	"formId": 3,
+	"order": 1,
+	"type": "conditional",
+	"isRequired": true,
+	"text": "Do you have any dietary restrictions?",
+	"options": [
+		{ "id": 42, "questionId": 100, "order": 1, "text": "Yes" },
+		{ "id": 43, "questionId": 100, "order": 2, "text": "No" }
+	],
+	"extraSettings": {
+		"triggerType": "dropdown",
+		"branches": [
+			{
+				"id": "branch-yes",
+				"conditions": [{ "type": "option_selected", "optionId": 42 }],
+				"subQuestions": [
+					{
+						"id": 101,
+						"formId": 3,
+						"order": 1,
+						"type": "long",
+						"text": "Please describe your dietary restrictions",
+						"parentQuestionId": 100,
+						"branchId": "branch-yes"
+					}
+				]
+			}
+		]
+	}
+}
+```
+
+### Conditional Answer Structure
+
+When submitting or storing conditional question answers, the structure differs from regular questions:
+
+```json
+{
+	"100": {
+		"trigger": ["42"],
+		"subQuestions": {
+			"101": ["Vegetarian, no nuts"]
+		}
+	}
+}
+```
+
+| Property     | Type                        | Description                                         |
+| ------------ | --------------------------- | --------------------------------------------------- |
+| trigger      | Array of strings            | Answer values for the trigger question              |
+| subQuestions | Object (questionId → Array) | Map of subquestion IDs to their answer value arrays |

lib/Constants.php

@@ -1,7 +1,7 @@
 <?php
 
 /**
- * SPDX-FileCopyrightText: 2021 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2021-2026 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 
@@ -92,6 +92,7 @@ class Constants {
 
 	// Available AnswerTypes
 	public const ANSWER_TYPE_COLOR = 'color';
+	public const ANSWER_TYPE_CONDITIONAL = 'conditional';
 	public const ANSWER_TYPE_DATE = 'date';
 	public const ANSWER_TYPE_DATETIME = 'datetime';
 	public const ANSWER_TYPE_DROPDOWN = 'dropdown';
@@ -112,6 +113,7 @@ class Constants {
 	// All AnswerTypes
 	public const ANSWER_TYPES = [
 		self::ANSWER_TYPE_COLOR,
+		self::ANSWER_TYPE_CONDITIONAL,
 		self::ANSWER_TYPE_DATE,
 		self::ANSWER_TYPE_DATETIME,
 		self::ANSWER_TYPE_DROPDOWN,
@@ -230,6 +232,70 @@ class Constants {
 		self::ANSWER_GRID_TYPE_RADIO,
 	];
 
+	/**
+	 * Extra settings for conditional questions
+	 * - triggerType: The question type used for the trigger (e.g., 'multiple_unique', 'dropdown', 'short')
+	 * - branches: Array of branch definitions, each containing:
+	 *   - id: Unique branch identifier
+	 *   - conditions: Array of condition objects defining when this branch is active
+	 *     For predefined types: [{ optionId: number }]
+	 *     For text types: [{ type: 'string_equals'|'string_contains'|'regex', value: string }]
+	 *     For numeric/scale: [{ type: 'value_equals'|'value_range', value: number, min?: number, max?: number }]
+	 */
+	public const EXTRA_SETTINGS_CONDITIONAL = [
+		'triggerType' => ['string'],
+		'branches' => ['array'],
+	];
+
+	/**
+	 * Condition types for conditional questions
+	 */
+	public const CONDITION_TYPE_OPTION_SELECTED = 'option_selected';
+	public const CONDITION_TYPE_OPTIONS_COMBINATION = 'options_combination';
+	public const CONDITION_TYPE_STRING_EQUALS = 'string_equals';
+	public const CONDITION_TYPE_STRING_CONTAINS = 'string_contains';
+	public const CONDITION_TYPE_REGEX = 'regex';
+	public const CONDITION_TYPE_VALUE_EQUALS = 'value_equals';
+	public const CONDITION_TYPE_VALUE_NOT_EQUALS = 'value_not_equals';
+	public const CONDITION_TYPE_VALUE_RANGE = 'value_range';
+	public const CONDITION_TYPE_VALUE_MIN = 'value_min';
+	public const CONDITION_TYPE_VALUE_MAX = 'value_max';
+	public const CONDITION_TYPE_DATE_RANGE = 'date_range';
+	public const CONDITION_TYPE_FILE_UPLOADED = 'file_uploaded';
+
+	public const CONDITION_TYPES = [
+		self::CONDITION_TYPE_OPTION_SELECTED,
+		self::CONDITION_TYPE_OPTIONS_COMBINATION,
+		self::CONDITION_TYPE_STRING_EQUALS,
+		self::CONDITION_TYPE_STRING_CONTAINS,
+		self::CONDITION_TYPE_REGEX,
+		self::CONDITION_TYPE_VALUE_EQUALS,
+		self::CONDITION_TYPE_VALUE_NOT_EQUALS,
+		self::CONDITION_TYPE_VALUE_RANGE,
+		self::CONDITION_TYPE_VALUE_MIN,
+		self::CONDITION_TYPE_VALUE_MAX,
+		self::CONDITION_TYPE_DATE_RANGE,
+		self::CONDITION_TYPE_FILE_UPLOADED,
+	];
+
+	/**
+	 * Trigger types allowed for conditional questions
+	 * Maps each trigger type to its supported condition types
+	 */
+	public const CONDITIONAL_TRIGGER_TYPES = [
+		self::ANSWER_TYPE_MULTIPLEUNIQUE => [self::CONDITION_TYPE_OPTION_SELECTED],
+		self::ANSWER_TYPE_DROPDOWN => [self::CONDITION_TYPE_OPTION_SELECTED],
+		self::ANSWER_TYPE_MULTIPLE => [self::CONDITION_TYPE_OPTIONS_COMBINATION],
+		self::ANSWER_TYPE_SHORT => [self::CONDITION_TYPE_STRING_EQUALS, self::CONDITION_TYPE_STRING_CONTAINS, self::CONDITION_TYPE_REGEX],
+		self::ANSWER_TYPE_LONG => [self::CONDITION_TYPE_STRING_CONTAINS, self::CONDITION_TYPE_REGEX],
+		self::ANSWER_TYPE_LINEARSCALE => [self::CONDITION_TYPE_VALUE_EQUALS, self::CONDITION_TYPE_VALUE_NOT_EQUALS, self::CONDITION_TYPE_VALUE_RANGE, self::CONDITION_TYPE_VALUE_MIN, self::CONDITION_TYPE_VALUE_MAX],
+		self::ANSWER_TYPE_DATE => [self::CONDITION_TYPE_DATE_RANGE],
+		self::ANSWER_TYPE_DATETIME => [self::CONDITION_TYPE_DATE_RANGE],
+		self::ANSWER_TYPE_TIME => [self::CONDITION_TYPE_VALUE_RANGE],
+		self::ANSWER_TYPE_COLOR => [self::CONDITION_TYPE_VALUE_EQUALS],
+		self::ANSWER_TYPE_FILE => [self::CONDITION_TYPE_FILE_UPLOADED],
+	];
+
 	/**
 	 * !! Keep in sync with src/mixins/ShareTypes.js !!
 	 */