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RunService

Show deprecated

RunService

Show deprecated

RunService contains methods and events for time-management as well as for managing the context in which a game or script is running. Methods like RunService/IsClient|IsClient, RunService/IsServer|IsServer, RunService/IsStudio|IsStudio, can help you determine under what context code is running. These methods are useful for ModuleScripts that may be required by both client and server scripts. Furthermore, RunService/IsStudio|IsStudio can be used to add special behaviors for in-studio testing.

RunService also houses events that allow your code to adhere to Roblox’s frame-by-frame loop, such as RunService/Stepped|Stepped, RunService/Heartbeat|Heartbeat and RunService/RenderStepped|RenderStepped. Selecting the proper event to use for any case is important, so you should read articles/Task Scheduler|Task Scheduler to make an informed decision.

Properties

Inherited from Instance: Show Hide

bool

Archivable

Determines if an Instance can be cloned using /Instance/Clone or saved to file.

string

ClassName

[ReadOnly] [NotReplicated]

A read-only string representing the class this Instance belongs to

int

DataCost

[ReadOnly] [NotReplicated] [Deprecated]

The cost of saving the instance using data persistence.

string

Name

A non-unique identifier of the Instance

Instance

Parent

Determines the hierarchical parent of the Instance

bool

RobloxLocked

[Deprecated]

A deprecated property that used to protect CoreGui objects

bool

archivable

[Hidden] [NotReplicated] [Deprecated]
string

className

[ReadOnly] [NotReplicated] [Deprecated]

Functions

void

BindToRenderStep ( string name , int priority , Function function )

Given a string name of a function and a priority, this method binds the function to RunService/RenderStepped

bool

IsClient ( )

Returns whether the current environment is running on the client

bool

IsEdit ( )

Returns whether the current environment is in Edit mode

bool

IsRunMode ( )

Returns whether the ‘Run’ button has been pressed to run the simulation in Roblox Studio

bool

IsRunning ( )

Returns whether the game is currently running

bool

IsServer ( )

Returns whether the current environment is running on the server

bool

IsStudio ( )

Returns whether the current environment is running in Roblox Studio

void

Pause ( )

Pauses the game’s simulation if it is running, suspending physics and scripts

void

Reset ( )

[Deprecated]

Resets the current game to a waypoint set when RunService/Run was called

void

Run ( )

Runs the game’s simulation, running physics and scripts

void

Stop ( )

Ends the game’s simulation if it is running

void

UnbindFromRenderStep ( string name )

Unbinds a function that was bound to the render loop using RunService/BindToRenderStep

Inherited from Instance: Show Hide

void

ClearAllChildren ( )

This function destroys all of an Instance's children.

Instance

Clone ( )

Create a deep copy of a Roblox instance and descendants where Archivable = true.

void

Destroy ( )

Sets the Instance/Parent property to nil, locks the Instance/Parent property, disconnects all connections and calls Destroy on all children.

Instance

FindFirstAncestor ( string name )

Returns the first ancestor of the Instance whose Instance/Name is equal to the given name.

Instance

FindFirstAncestorOfClass ( string className )

Returns the first ancestor of the Instance whose Instance/ClassName is equal to the given className.

Instance

FindFirstAncestorWhichIsA ( string className )

Returns the first ancestor of the Instance for whom Instance/IsA returns true for the given className.

Instance

FindFirstChild ( string name , bool recursive )

Returns the first child of the Instance found with the given name.

Instance

FindFirstChildOfClass ( string className )

Returns the first child of the Instance whose Instance/ClassName|ClassName is equal to the given className.

Instance

FindFirstChildWhichIsA ( string className , bool recursive )

Returns the first child of the Instance for whom Instance/IsA returns true for the given className.

Variant

GetAttribute ( string attribute )

Returns the attribute which has been assigned to the given name

RBXScriptSignal

GetAttributeChangedSignal ( string attribute )

Returns an event that fires when the given attribute changes

Dictionary

GetAttributes ( )

Returns a dictionary of string → variant pairs for each of the Instance|Instance’s attributes

Objects

GetChildren ( )

Returns an array containing all of the Instance's children.

string

GetDebugId ( int scopeLength )

[NotBrowsable]

Returns a coded string of the Instances DebugId used internally by Roblox.

Array

GetDescendants ( )

[CustomLuaState]

Returns an array containing all of the descendants of the instance

string

GetFullName ( )

Returns a string describing the Instance's ancestry.

RBXScriptSignal

GetPropertyChangedSignal ( string property )

Get an event that fires when a given property of an object changes.

bool

IsA ( string className )

[CustomLuaState]

Returns true if an Instance's class matches or inherits from a given class

bool

IsAncestorOf ( Instance descendant )

Returns true if an Instance is an ancestor of the given descendant.

bool

IsDescendantOf ( Instance ancestor )

Returns true if an Instance is a descendant of the given ancestor.

void

Remove ( )

[Deprecated]

Sets the object’s Parent to nil, and does the same for all its descendants.

void

SetAttribute ( string attribute , Variant value )

Sets the attribute with the given name to the given value

Instance

WaitForChild ( string childName , double timeOut )

[CustomLuaState] [CanYield]

Returns the child of the Instance with the given name. If the child does not exist, it will yield the current thread until it does.

Objects

children ( )

[Deprecated]

Returns an array of the object’s children.

Instance

clone ( )

[Deprecated]
void

destroy ( )

[Deprecated]
Instance

findFirstChild ( string name , bool recursive )

[Deprecated]
Objects

getChildren ( )

[Deprecated]
bool

isA ( string className )

[Deprecated] [CustomLuaState]
bool

isDescendantOf ( Instance ancestor )

[Deprecated]
void

remove ( )

[Deprecated]

Events

RBXScriptSignal

Heartbeat ( double step )

Fires every frame after the physics simulation has completed

RBXScriptSignal

RenderStepped ( double step )

Fires every frame prior to the frame being rendered

RBXScriptSignal

Stepped ( double time , double step )

Fires every frame prior to the physics simulation

Inherited from Instance: Show Hide

RBXScriptSignal

AncestryChanged ( Instance child , Instance parent )

Fires when the Instance/Parent property of the object or one of its ancestors is changed.

RBXScriptSignal

AttributeChanged ( string attribute )

Fires whenever an attribute is changed on the Instance

RBXScriptSignal

Changed ( string property )

[DetectingPropertyChanges]

Fired immediately after a property of an object changes.

RBXScriptSignal

ChildAdded ( Instance child )

Fires when an object is parented to this Instance.

RBXScriptSignal

ChildRemoved ( Instance child )

Fires when a child is removed from this Instance.

RBXScriptSignal

DescendantAdded ( Instance descendant )

Fires when a descendant is added to the Instance

RBXScriptSignal

DescendantRemoving ( Instance descendant )

Fires immediately before a descendant of the Instance is removed.

RBXScriptSignal

childAdded ( Instance child )

[Deprecated]

Code Samples


RunService Stepped

This code sample uses RunService’s Stepped event to create a Part that flies in a direction given a start position and speed. It uses a BodyPosition to move the Part, and calculates the new position of the Part each frame.