[**@uplink-protocol/form-controller v0.2.6**](../README.md) *** [@uplink-protocol/form-controller](../globals.md) / StepperService # Class: StepperService Defined in: [services/stepper.service.ts:8](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L8) Service for managing multi-step form navigation ## Extends - [`BaseService`](BaseService.md)\<`number`\> ## Constructors ### Constructor > **new StepperService**(`initialStepIndex`, `configService`): `StepperService` Defined in: [services/stepper.service.ts:11](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L11) #### Parameters ##### initialStepIndex `number` ##### configService [`ConfigService`](ConfigService.md) #### Returns `StepperService` #### Overrides [`BaseService`](BaseService.md).[`constructor`](BaseService.md#constructor) ## Properties ### \_callbacks > `protected` **\_callbacks**: (`value`) => `void`[] = `[]` Defined in: [services/base.service.ts:13](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/base.service.ts#L13) Array of callback functions subscribed to state changes #### Parameters ##### value `number` #### Returns `void` #### Inherited from [`BaseService`](BaseService.md).[`_callbacks`](BaseService.md#_callbacks) *** ### current > `protected` **current**: `number` Defined in: [services/base.service.ts:10](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/base.service.ts#L10) The current value of the service state #### Inherited from [`BaseService`](BaseService.md).[`current`](BaseService.md#current) ## Accessors ### isFirstStep #### Get Signature > **get** **isFirstStep**(): `boolean` Defined in: [services/stepper.service.ts:95](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L95) Check if currently on the first step ##### Returns `boolean` True if on first step *** ### isLastStep #### Get Signature > **get** **isLastStep**(): `boolean` Defined in: [services/stepper.service.ts:103](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L103) Check if currently on the last step ##### Returns `boolean` True if on last step ## Methods ### get() > **get**(): `number` Defined in: [services/base.service.ts:56](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/base.service.ts#L56) Get the current value #### Returns `number` Current value #### Inherited from [`BaseService`](BaseService.md).[`get`](BaseService.md#get) *** ### goToStep() > **goToStep**(`stepIndex`): `boolean` Defined in: [services/stepper.service.ts:81](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L81) Go to a specific step by index #### Parameters ##### stepIndex `number` Target step index #### Returns `boolean` True if navigation was successful, false otherwise *** ### goToStepWithBindings() > **goToStepWithBindings**(`stepIndex`, `updateBindings`): `boolean` Defined in: [services/stepper.service.ts:177](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L177) Enhanced version of goToStep that also updates bindings #### Parameters ##### stepIndex `number` Target step index ##### updateBindings (`newIndex`, `step`) => `void` Function to update bindings after navigation #### Returns `boolean` True if navigation succeeded, false otherwise *** ### nextStep() > **nextStep**(`validateCallback?`): `number` Defined in: [services/stepper.service.ts:21](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L21) Navigate to the next step if possible #### Parameters ##### validateCallback? () => `boolean` Optional validation callback that determines if navigation is allowed #### Returns `number` New step index or current step if navigation isn't possible *** ### nextStepWithValidation() > **nextStepWithValidation**(`currentStep`, `markFieldsTouched`, `validateCurrentStep`, `updateBindings`): `number` Defined in: [services/stepper.service.ts:116](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L116) Validate current step and navigate to next if valid Also updates bindings to ensure immediate access to current values #### Parameters ##### currentStep [`FormStep`](../interfaces/FormStep.md) The current step object ##### markFieldsTouched (`stepId`, `touched`) => `void` Function to mark fields as touched ##### validateCurrentStep (`showErrors`) => `boolean` Function to validate the current step ##### updateBindings (`newIndex`, `step`) => `void` Function to update bindings after navigation #### Returns `number` New step index or current step if navigation fails *** ### prevStep() > **prevStep**(): `number` Defined in: [services/stepper.service.ts:68](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L68) Navigate to the previous step if possible #### Returns `number` New step index or 0 if already at first step *** ### prevStepWithBindings() > **prevStepWithBindings**(`updateBindings`): `number` Defined in: [services/stepper.service.ts:152](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L152) Enhanced version of prevStep that also updates bindings #### Parameters ##### updateBindings (`newIndex`, `step`) => `void` Function to update bindings after navigation #### Returns `number` New step index or current index if navigation fails *** ### set() > **set**(`value`): `void` Defined in: [services/base.service.ts:45](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/base.service.ts#L45) Update the service value and notify all subscribers. #### Parameters ##### value `number` New value to set #### Returns `void` #### Inherited from [`BaseService`](BaseService.md).[`set`](BaseService.md#set) *** ### subscribe() > **subscribe**(`callback`): () => `void` Defined in: [services/base.service.ts:31](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/base.service.ts#L31) Subscribe to changes in the service value. Callback is immediately invoked with the current value. #### Parameters ##### callback (`value`) => `void` Function to be called when value changes #### Returns An unsubscribe function that removes this subscription > (): `void` ##### Returns `void` #### Inherited from [`BaseService`](BaseService.md).[`subscribe`](BaseService.md#subscribe) *** ### validateAndNext() > **validateAndNext**(`currentStepId`, `markStepTouched`, `validateStep`): `number` Defined in: [services/stepper.service.ts:40](https://github.com/jmkcoder/uplink-protocol-form-controller/blob/b4197b802291c2a362dd28d04ee111d1534495f5/src/services/stepper.service.ts#L40) Validate current step and navigate to next if valid #### Parameters ##### currentStepId `string` Current step ID for touch marking ##### markStepTouched (`stepId`, `touched`) => `void` Function to mark all fields in step as touched ##### validateStep (`showErrors`) => `boolean` Function to validate the current step #### Returns `number` New step index or current step if validation fails