<function name="RunJavascript" parent="Panel" type="classfunc"> <realm>Client</realm> <description> Runs/Executes a string as JavaScript code in a panel. <note>This function does **NOT** evaluate expression (i.e. allow you to pass variables from JavaScript (JS) to Lua context).<br/>Because a return value is nil/no value (a.k.a. void).<br/>If you wish to pass/return values from JS to Lua, you may want to use <page>DHTML:AddFunction</page> function to accomplish that job.</note> </description> <args> <arg name="js" type="string">Specify JavaScript code to be executed.</arg> </args> </function> <example> <description>Shows how to change [document.body.innerHTML](http://www.w3schools.com/jsref/prop_html_innerhtml.asp) property by calling this function on panel.</description> <code> -- First we create a container, in this case it is a full-screen Derma Frame window. local dframe = vgui.Create( 'DFrame' ) dframe:SetSize( ScrW(), ScrH() ) dframe:SetTitle( "Garry's Mod Wiki" ) dframe:Center() dframe:MakePopup() -- Enable keyboard and mouse interaction for DFrame panel. -- Create a new DHTML panel as a child of dframe, and dock-fill it. local dhtml = vgui.Create( 'DHTML', dframe ) dhtml:Dock( FILL ) -- Navigate to Garry's Mod wikipedia website. dhtml:OpenURL( 'https://wiki.garrysmod.com/index.php' ) -- Run JavaScript code. dhtml:RunJavascript( "<page>document.body.innerHTML = 'HTML changed from Lua using JavaScript!';</page>" ) dhtml:RunJavascript( "document.body.innerHTML = 'HTML changed from Lua using JavaScript!';" ) -- This does not throw an error/exception, but instead returns nil/no value. -- That means you can't pass/return values from JavaScript back to Lua context using this function. local number = dhtml:Call( '22;' ) print( number ) </code> <output>Inner HTML of document body in DHTML panel is now set to "HTML changed from Lua using JavaScript!".</output> </example>