Menu
Creates a list of two or more text labeled menu items for the user to choose from. When the menu is tapped by the user, the list is displayed full screen in the app, displaying up to 11 menu items. More than 11 menu items may be accessed by scrolling the list. When the user taps a menu item, the zero based index is assigned to the assigned integer/enum datastream. The order of the menu items can be easily changed by dragging them vertically. Delete menu items by swiping them to the right.
Datastream
Select or create a datastream of data type integer or enumerable.
Widget Controls
The widget controls are solely the menu items. If the number of items exceeds the page height, then the page can be scrolled vertically.
How to process widget with the hardware
When the menu item is pressed, value is sent and stored into the Blynk.Cloud. After that it's sent to your device.
Reading the widget value(s)
Example code:
Changing button state
You can change the value of the datastream assigned to the widget with hardware or HTTP API. For a datastream V5 assigned data type of integer or enumerable, the following will change the option selection to the second (index = 1):
Hardware:
HTTP API:
Don't put Blynk.virtualWrite()
into the void loop()
as it can cause a flood of messages and your hardware will be disconnected. Send such updates only when necessary, use flags, or timers.
Sketch: Menu
Change Widget Properties
You can change certain properties of the Widget from your hardware. For that, use this command:
Where:
vPin
is: virtual pin number the widget is assigned towidgetProperty
: property you want to changepropertyValue
: value of the property you want to change
Don't put Blynk.setProperty()
into the void loop()
as it can cause a flood of messages and your hardware will be disconnected. Send such updates only when necessary, or use timers.
Properties you can change
You can change the properties label, color, isDisabled, isHidden of the widget from your hardware, or via an HTTP API. The URL must be encoded, so spaces in labels must be replaced with %20, and color hexadecimal values in the HTTP API URL must include the hash # character urlencoded as %23.
Change Widget Label
Set Widget Color
Disable/Enable
Widget will be greyed out on UI and users won't be able to tap on it.
Show/Hide
Widget will be hidden from dashboard. Design your UI so that it doesn't look weird when there is no widget.
Change widget properties via HTTPs API
Updates the Datastream Property and all assigned Widgets
GET
https://{server_address}/external/api/update/property?token={your 32 char token}&pin={your vPin}&{property}={value}
The endpoint allows you to update the Datastream Property value via GET request. All widgets (both web and mobile) that are assigned to this datastream will inherit this property. The Datastream Property is persistent and will be stored forever until you change it with another value. In order to clear the property you need to clear the device data in device actions menu.
Example:
https://blynk.cloud/external/api/update/property?token=GVki9IC70vb3IqvsV0YD3el4y0OpneL1&pin=V2&label=My%20Label
https://blynk.cloud/external/api/update/property?token=GVki9IC70vb3IqvsV0YD3el4y0OpneL1&pin=V1&color=%23D3435C
https://blynk.cloud/external/api/update/property?token=GVki9IC70vb3IqvsV0YD3el4y0OpneL1&pin=V1&isDisabled=true
Path Parameters
Name | Type | Description |
---|---|---|
{server address}* | string | Get from the bottom right of your Blynk console. More information. |
Query Parameters
Name | Type | Description |
---|---|---|
token* | string | Device auth token from Device info |
pin* | string | The datastream virtual pin (should start with "v") |
{property} | string | The property of the widget you want to update: |
label | string | the text used as widget label |
color | string | button color hexadecimal, must include the hash # character urlencoded as %23 |
isDisabled | string | true or false |
isHidden | string | true or false |
Sync to the latest known state
You can update your hardware to the latest datastream value from Blynk.Cloud after your hardware went offline, and then came online again. Use Blynk.syncVirtual()
to update a single virtual pin, or Blynk.syncAll()
to update all virtual pins. See State Syncing for more details.
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