<function name="AddChangeCallback" parent="cvars" type="libraryfunc"> <description> Adds a callback to be called when the named convar changes. <bug issue="1440">This does not callback convars in the menu state.</bug> <bug issue="3503">This does not callback convars on the client with FCVAR_GAMEDLL and convars on the server without FCVAR_GAMEDLL.</bug> <bug issue="3740">This does not callback convars on the client with FCVAR_REPLICATED.</bug> </description> <realm>Shared and Menu</realm> <args> <arg name="name" type="string">The name of the convar to add the change callback to.</arg> <arg name="callback" type="function">The function to be called when the convar changes. The arguments passed are:&#xA;* &lt;page&gt;string&lt;/page&gt; convar - The name of the convar.&#xA;* &lt;page&gt;string&lt;/page&gt; oldValue - The old value of the convar.&#xA;* &lt;page&gt;string&lt;/page&gt; newValue - The new value of the convar.</arg>⤶ <arg name="identifier" type="string" default="nil">If set, you will be able to remove the callback using &lt;page&gt;cvars.RemoveChangeCallback&lt;/page&gt;.</arg>⤶ <arg name="callback" type="function">The function to be called when the convar changes. The arguments passed are:⤶ * <page>string</page> convar - The name of the convar.⤶ * <page>string</page> oldValue - The old value of the convar.⤶ * <page>string</page> newValue - The new value of the convar.</arg>⤶ <arg name="identifier" type="string" default="nil">If set, you will be able to remove the callback using <page>cvars.RemoveChangeCallback</page>.</arg>⤶ </args> </function> <example> <description>Called when convar changes.</description> <code> cvars.AddChangeCallback("convar name", function(convar_name, value_old, value_new) print(convar_name, value_old, value_new) end) </code> <output>"convar name" 2 5</output> </example>