Revision Difference
Entity:NetworkVarNotify#514667
<function name="NetworkVarNotify" parent="Entity" type="classfunc">⤶
<description>⤶
Creates a callback that will execute when the given network variable changes - that is, when the Set&lt;name&gt; function is run.⤶
⤶
<note>The callback is executed `before` the value is changed, and is called even if the new and old values are the same.</note>⤶
⤶
<note>This function does not exist on entities in which <page>Entity:InstallDataTable</page> has not been called. By default, this means this function only exists on SENTs (both serverside and clientside) and on players with a [Player Class](/gmod/Player_Classes) (serverside and clientside <page>Global.LocalPlayer</page> only!). It is therefore safest to only use this in <page>ENTITY:SetupDataTables</page>.</note>⤶
⤶
<bug request="324">The callback will not be called clientside if the var is changed right after entity spawn.</bug>⤶
</description>⤶
<realm>Shared</realm>⤶
<file line="289-299">lua/includes/extensions/entity.lua</file>⤶
<args>⤶
<arg name="name" type="string">Name of variable to track changes of</arg>⤶
<arg name="callback" type="function">The function to call when the variable changes. It is passed 4 arugments:
* <page>Entity</page> entity - Entity whos variable changed (This will be variable called "self" in ENT:CallBack format.)
* <page>string</page> name - Name of changed variable
* <page>any</page> old - Old/current variable value
* <page>any</page> new - New variable value that it was set to</arg>⤶
</args>⤶
</function>⤶
⤶
<example>⤶
<description>Example usage</description>⤶
<code>⤶
function ENT:SetupDataTables()⤶
⤶
self:NetworkVar( "Float", 0, "Amount" )⤶
self:NetworkVar( "Vector", 1, "StartPos" )⤶
self:NetworkVar( "Vector", 2, "EndPos" )⤶
⤶
if ( SERVER ) then⤶
self:NetworkVarNotify( "EndPos", self.OnVarChanged )⤶
end⤶
⤶
end⤶
⤶
function ENT:OnVarChanged( name, old, new )⤶
print( name, old, new )⤶
end⤶
</code>⤶
<output>Prints variable name, old value and new value whenever SetEndPos function is called</output>⤶
⤶
</example>
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