Hook

Hooks are a powerfull way for one script to interact/modify another script at specific, pre-defined spots. In contrast to events, hooks are synchronous. Two kinds of hook exist :

• Filters are a way to edit data used by the script. Filters are fired at a specific point in time during the execution of the script and a value has to be returned.
• Actions are a way to add new features in a script. Actions are functions that occurs at a specific point in time during the execution of the script. No value need to be return.

Actions

jo.hook.doActions()

Calls the functions that have been added to an action hook

Syntax

jo.hook.doActions(name,...)

Parameters

name : string

The name of the action to be executed

... : mixed Optional

Additional arguments which are passed on the functions hooked.

Example

local distance = 10
local price = 500
jo.hook.doActions('action_name', 10, 50)

jo.hook.registerAction()

Register a function to an action hook

Syntax

jo.hook.registerAction(name,cb,prority)

Parameters

name : string

The name of the action to add the callback to

cb : function

The function to be run when the action is called

priority : integer Optional

Used to specify the order in which the functions are executed.
Lower numbers correspond with earlier execution.
default: 10

Example

From the same resource:

jo.hook.registerAction('action_name', function(distance,price)
  print(distance,price)
end,10)

From another resource:

exports.resource_name:registerAction('action_name', function(distance,price)
  print(distance,price)
end,10)

Filters

jo.hook.applyFilters()

Calls the functions that have been added to a filter hook

Syntax

jo.hook.applyFilters(name,value,...)

Parameters

name : string

The name of the filter hook

value : mixed

The value to filter

... : mixed Optional

Additional arguments which are passed on the functions hooked.

Example

local distance = 500
local price = 10
print(price)
price = jo.hook.applyFilters('filter_name', price, distance)
print(price)

jo.hook.registerFilter()

Register a function to a filter hook

Syntax

jo.hook.registerFilter(name,cb,prority)

Parameters

name : string

The name of the action to add the callback to

cb : function

The function to be run when the action is called

priority : integer Optional

Used to specify the order in which the functions are executed.
Lower numbers correspond with earlier execution.
default: 10

Example

From the same resource:

jo.hook.registerFilter('filter_name', function(price,distance)
  if distance > 100 then
    price = price/2
  end
  return price
end,10)

From another resource:

exports.resource_name:registerFilter('filter_name', function(price,distance)
  if distance > 100 then
    price = price/2
  end
  return price
end,10)