# Input Device


The input device management module is used to listen for the connection, disconnection, and updates of input devices and display information about input devices. For example, it can be used to listen for mouse insertion and removal and obtain information such as the ID, name, and pointer speed of the mouse.


> **NOTE**<br>
> The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.


## Modules to Import


```
import inputDevice from '@ohos.multimodalInput.inputDevice';
```


## inputDevice.getDeviceIds

getDeviceIds(callback: AsyncCallback&lt;Array&lt;number&gt;&gt;): void

Obtains the IDs of all input devices. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.MultimodalInput.Input.InputDevice

**Parameters**

| Name      | Type                                      | Mandatory  | Description   |
| -------- | ---------------------------------------- | ---- | ----- |
| callback | AsyncCallback&lt;Array&lt;number&gt;&gt; | Yes   | Callback used to return the result.|


**Example**

```
export default {
    data: {
        deviceIds: Array,
    },
    callback: function(ids) {
        this.deviceIds = ids;
    },
    testGetDeviceIds: function () {
        console.info("InputDeviceJsTest---start---testGetDeviceIds");
        inputDevice.getDeviceIds(this.callback);
        console.info("InputDeviceJsTest---end---testGetDeviceIds");
    }
}
```

## inputDevice.getDeviceIds

function getDeviceIds(): Promise<Array<number>>

Obtains the IDs of all input devices. This API uses a promise to return the result.

**System capability**: SystemCapability.MultimodalInput.Input.InputDevice

**Return value**

| Parameter                    | Description                |
| ---------------------- | ------------------ |
| Promise<Array<number>> | Promise used to return the result.|

**Example**

```
export default {
    testGetDeviceIds: function () {
        console.info("InputDeviceJsTest---start---testGetDeviceIds");
        let promise = inputDevice.getDeviceIds();
        promise.then((data)=> {
            console.info('GetDeviceIds successed, Data: ' + JSON.stringify(data))
        }).catch((err)=>{
            console.error('Failed GetDeviceIds. Cause: ' + JSON.stringify(err));
        });
    }
}
```





## inputDevice.getDevice

getDevice(deviceId: number, callback: AsyncCallback&lt;InputDeviceData&gt;): void

Obtains the information about an input device. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.MultimodalInput.Input.InputDevice

**Parameters**

| Name      | Type                                      | Mandatory  | Description                         |
| -------- | ---------------------------------------- | ---- | --------------------------- |
| deviceId | number                                   | Yes   | ID of the input device whose information is to be obtained.               |
| callback | AsyncCallback&lt;[InputDeviceData](#inputdevicedata)&gt; | Yes   | Callback used to return the **InputDeviceData** object.|

**Example**

```
export default {
    InputDeviceData: {
        deviceId : 0,
        name : "NA",
        sources : Array,
        axisRanges : Array,
    },
    callback: function(deviceData) {
        this.InputDeviceData = deviceData;
    },
    testGetDevice: function () {
        // The example is used to obtain the information about the device whose ID is 1.
        console.info("InputDeviceJsTest---start---testGetDevice");
        inputDevice.getDevice(1, this.callback);
        console.info("InputDeviceJsTest---end---testGetDevice");
    }
}
```

## inputDevice.getDevice

function getDevice(deviceId: number): Promise<InputDeviceData>

Obtains the information about an input device. This API uses a promise to return the result.

**System capability**: SystemCapability.MultimodalInput.Input.InputDevice

**Return value**

| Parameter                      | Description                |
| ------------------------ | ------------------ |
| Promise<InputDeviceData> | Promise used to return the result.|

**Example**

```
export default {
    InputDeviceData: {
        deviceId : 0,
        name : "NA",
        sources : Array,
        axisRanges : Array,
    },
    testGetDevice: function () {
        // The example is used to obtain the information about the device whose ID is 1.
        console.info("InputDeviceJsTest---start---testGetDevice");
        let promise = inputDevice.getDevice(1);
        promise.then((data)=> {
            console.info('GetDeviceId successed, Data: ' + JSON.stringify(data))
        }).catch((err)=>{
            console.error('Failed GetDeviceId. Cause: ' + JSON.stringify(err));
        });
    }
}
```



## InputDeviceData

Defines the information about an input device.

**System capability**: SystemCapability.MultimodalInput.Input.InputDevice

| Name      | Type                              | Description                                                        |
| ---------- | -------------------------------------- | ------------------------------------------------------------ |
| id         | number                                 | Unique identifier of an input device. If the same physical device is repeatedly inserted and removed, its ID changes.|
| name       | string                                 | Name of the input device.                                            |
| sources    | Array&lt;[SourceType](#sourcetype)&gt; | Source types of the input device. For example, if a keyboard is attached with a touchpad, the device has two input sources: keyboard and touchpad.|
| axisRanges | Array&lt;[axisRanges](#axisrange)&gt;  | Axis information of the input device.                                          |
| bus        | number                                 | Bus type of the input device.                                        |
| product    | number                                 | Product information of the input device.                                        |
| vendor     | number                                 | Vendor information of the input device.                                        |
| version    | number                                 | Version information of the input device.                                        |
| phys       | string                                 | Physical address of the input device.                                        |
| uniq       | string                                 | Unique ID of the input device.                                        |

## AxisType

Defines the axis type of an input device, which is **NULL**.

## AxisRange

Defines the axis information of an input device.

**System capability**: SystemCapability.MultimodalInput.Input.InputDevice

| Name    | Type                     | Description      |
| ------ | ------------------------- | -------- |
| source | [SourceType](#sourcetype) | Input source type of the axis.|
| axis   | [AxisType](axistype)      | Axis type.    |
| max    | number                    | Maximum value reported by the axis. |
| min    | number                    | Minimum value reported by the axis. |



## SourceType

Enumerates the input source types. For example, if a mouse reports an x-axis event, the source of the x-axis is the mouse.

**System capability**: SystemCapability.MultimodalInput.Input.InputDevice

| Name         | Type  | Description         |
| ----------- | ------ | ----------- |
| keyboard    | string | The input device is a keyboard. |
| touchscreen | string | The input device is a touchscreen.|
| mouse       | string | The input device is a mouse. |
| trackball   | string | The input device is a trackball.|
| touchpad    | string | The input device is a touchpad.|
| joystick    | string | The input device is a joystick.|