Documentation
About FAQ Projects GitHub Troubleshoot EV3 Manager Bluetooth Forum LEGO Support FIRST LEGO League
Reference
Brick
show string show number show value show mood show image clear screen show ports on event is pressed was pressed pause until set light battery level
run stop reset set brake set inverted set regulated tank steer angle speed clear counts stop all motors
on event pause until is pressed was pressed
angle rate reset
on event distance pause until
on event distance pause until
on event pause until is pressed was pressed set remote channel
on color detected pause until color detected on light detected pause until light condition detected color light
play sound effect play sound effect until done play tone ring tone stop all sounds rest change tempo by set tempo note frequency beat set volume
seconds millis reset pause until
log log value send to screen
Blocks
On Start
repeat for while for of
if Boolean
assign change var var
Math JavaScript blocks Custom blocks
Python
Calling Sequencing Variables Operators Statements Functions Classes
JavaScript
Calling Sequencing Variables Operators Statements Functions Types Classes Interfaces Generics
Types
Number String Boolean Array Function
Developers
Command Line Interface Visual Studio Code support Blocks Embed
Getting Started
Try Use
Tutorials
Wake Up! Make An Animation What Animal Am I? Music Brick Run Motors Tank ZigZag Touch to Run Touch Sensor Values What Color? Line Following Red Light, Green Light Reflected Light Measure Reflected Light Calibration Object Near? Security Alert
Coding
Autonomous Parking Object Detection Line Detection
Design Engineering
Make It Move Without Wheels Make It Smarter and Faster Make a System that Communicates
Maker
Make a Sound Machine Make a Security Gadget
Documentation
About FAQ Projects GitHub Troubleshoot EV3 Manager Bluetooth Forum LEGO Support FIRST LEGO League
Reference
Brick
show string show number show value show mood show image clear screen show ports on event is pressed was pressed pause until set light battery level
run stop reset set brake set inverted set regulated tank steer angle speed clear counts stop all motors
on event pause until is pressed was pressed
angle rate reset
on event distance pause until
on event distance pause until
on event pause until is pressed was pressed set remote channel
on color detected pause until color detected on light detected pause until light condition detected color light
play sound effect play sound effect until done play tone ring tone stop all sounds rest change tempo by set tempo note frequency beat set volume
seconds millis reset pause until
log log value send to screen
Blocks
On Start
repeat for while for of
if Boolean
assign change var var
Math JavaScript blocks Custom blocks
Python
Calling Sequencing Variables Operators Statements Functions Classes
JavaScript
Calling Sequencing Variables Operators Statements Functions Types Classes Interfaces Generics
Types
Number String Boolean Array Function
Developers
Command Line Interface Visual Studio Code support Blocks Embed
Getting Started
Try Use
Tutorials
Wake Up! Make An Animation What Animal Am I? Music Brick Run Motors Tank ZigZag Touch to Run Touch Sensor Values What Color? Line Following Red Light, Green Light Reflected Light Measure Reflected Light Calibration Object Near? Security Alert
Coding
Autonomous Parking Object Detection Line Detection
Design Engineering
Make It Move Without Wheels Make It Smarter and Faster Make a System that Communicates
Maker
Make a Sound Machine Make a Security Gadget

on Event

Run some code when a button is clicked, pressed down, or released.

brick.buttonEnter.onEvent(ButtonEvent.Bumped, function () {

});

Touch sensors

Your LEGO® MINDSTORMS® Education EV3 has touch sensors that work like buttons. Instead of saying enter or left as the source button, use a touch sensor block with a sensor name like touch 1.

sensors.touch1.onEvent(ButtonEvent.Pressed, function () {
    brick.setStatusLight(StatusLight.Orange);
});

Read about touch sensors and using them as touch buttons.

Parameters

  • ev: the button action to run some code for. The button actions (events) are:
    • click: button was clicked (pressed and released)
    • up: button is released from just being pressed
    • down: button is just pressed down
  • body: the code you want to run when something happens with a button

Example

Check for event on the ENTER button. Put a message on the screen when the button is pressed, clicked, or released.

brick.showString("ENTER is: UP", 1);
brick.buttonEnter.onEvent(ButtonEvent.Released, function () {
    brick.showString("ENTER is: UP      ", 1);
});
brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
    brick.showString("ENTER is: DOWN    ", 1);
});
brick.buttonEnter.onEvent(ButtonEvent.Bumped, function () {
    brick.showString("ENTER was: CLICKED", 1);
});

See also

is pressed, was pressed,

Touch sensor

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