Supported Keywords - QB64/qbjs - QB64: Modern BASIC

Table of Contents

QBasic 4.5 Keywords
QB64 Keywords
QBJS Keywords
QBJS Standard Modules

2D Graphics
Console
Dom
FileSystem
Storage

The following table lists the QBasic and QB64 keywords that are currently supported by QBJS. This page will be updated as additional keyword support is added.

QBasic 4.5 Keywords
QB64 Keywords
QBJS Keywords
QBJS Standard Modules

QBasic 4.5 Keywords

Keyword	Support	Notes
Abs	Full
Asc	Full
Atn	Full
Beep	Full
Call	Full
ChDir	Full
CDbl	Full
Chr$	Full
CInt	Full
Circle	Full
CLng	Full
Close	Full
Cls	Partial	No support for optional method parameter. Entire screen will be cleared regardless of selected method.
CSng	Full
Color	Partial	RGB colors only supported when created with one of the supported RGB functions. Legacy 256 color table supported regardless of screen mode.
Command$	Limited	Always returns an empty string
Cos	Full
Csrlin	Full
Cvi	Full
Cvl	Full
Data	Full
Date$	Full
Dim	Full
Draw	Full
ReDim	Full
Do...Loop	Full
End	Partial	Optional return code parameter is ignored
Environ	Limited	No-op. Included for compatibility
Environ$	Limited	Always returns empty string "". Included for compatibility
EOF	Full
Error	Partial	Calling this method will trigger an error and halt execution. Unlike the QB/QB64 implementation, errors will be reported as "Unhandled Error #{errorNumber}" regardless of the error number passed to the method.
Exit	Full
Exp	Full
Files	Full
Fix	Full
For...Next	Full
FreeFile	Full
Function	Full
Get	Full
Hex$	Full
If...Then	Partial	No support for "IF (condition) GOTO"
InKey$	Full
Input	Full
Input (file statement)	Full
InStr	Full
Int	Full
Kill	Full
LBound	Full
LCase$	Full
Left$	Full
Len	Full
Let	Full
Line	Full
Line Input	Full
Line Input (file statement)	Full
Loc	Partial	Returns the present file byte position. No COM usage is supported.
Locate	Partial	Only monotype font 16 supported at present
LOF	Full
Log	Full
LTrim$	Full
Mid$	Partial	Only the Mid$ function is supported at present
MkDir	Full
Mki$	Full
Mkl$	Full
Name	Full
Oct$	Full
Open	Full
Paint	Partial	Tiling patterns are not currently supported for the fillColor parameter
Point	Full
Pos	Full
PReset	Full
Print	Full
Print (file statement)	Full
PSet	Full
Put	Full
Randomize	Full
Read	Full
Restore	Full
Rem	Full
Right$	Full
RmDir	Full
RTrim$	Full
Rnd	Partial
Screen	Partial	Optional active_page and visual_page parameters are not supported.
Shared	Partial	Declaration of shared variables in the main module when used in combination with DIM is supported. Declaring shared variables inside SUBs or FUNCTIONs (without DIM) is supported for syntax compatibility. However, because implicit variable declaration is not yet supported, shared variables must be declared in the main module.
Seek	Full
Select Case	Partial	No support currently for "SELECT EVERYCASE" or "CASE [lowerValue] TO [upperValue]
Sound	Full	In addition to the required frequency and duration parameters, the following option parameters are also available: `SOUND frequency, duration, shape, decay, gain` shape - the sound waveform to use. Valid options are: "square", "sine", "sawtooth", and "triangle" decay - the rate at which the sound fades to silence. Valid values are in the range 0.0-1.0. gain -
Space$	Full
Static	Partial	Static variable declarations within SUBs and FUNCTIONs are supported. At present using the STATIC keyword after a function or sub definition to force all variables to be static is not supported.
String$	Full
Sgn	Full
Sin	Full
Sleep	Full
Sqr	Full
Str$	Full
Sub	Full
Swap	Full
System	Partial	Optional return code parameter is ignored
Tan	Full
Time$	Full
Timer	Partial	Not currently supporting the optional accuracy parameter.
UBound	Full
UCase$	Full
Val	Full
VarPtr$	Full
While...WEnd	Full
Window	Full
Write	Full
Write (file statement)	Full

QB64 Keywords

Keyword	Support	Notes
_Acos	Full
_Acosh	Full
_Alpha	Partial	Optional imageHandle parameter is not supported
_Alpha32	Full
_Arccot	Full
_Arccsc	Full
_Arcsec	Full
_Asin	Full
_Asinh	Full
_Atan2	Full
_Atanh	Full
_AutoDisplay	Limited	Always returns true (-1). QBJS display refresh is always handled automatically. This method is included for compatibility.
_BackgroundColor	Full
_Blue	Partial	Optional imageHandle parameter is not supported
_Blue32	Full
_Capslock	Partial	Statement version not supported as browser security prevents changing the button state.
_Ceil	Full
_CommandCount	Limited	Always returns 0. Included for compatibility.
_Continue	Full
_Cosh	Full
_Cot	Full
_Coth	Full
_CopyImage	Full
_Csc	Full
_Csch	Full
_CWD$	Full
_D2G	Full
_D2R	Full
_DefaultColor	Partial	Optional imageHandle parameter is not supported
_Deflate$	Full
_Delay	Full
_DesktopHeight	Full
_DesktopWidth	Full
_Dest	Full
_Dir$	Limited	Always returns "./". Included for compatibility.
_DirExists	Full
_Display	Limited	Sub version of this method has no effect. Function always returns 0. QBJS display refresh is handled automatically. This method is included for compatibility.
_Echo	Partial	Messages passed to this method will be displayed in the browser's debug console. This is equivalent to calling `console.log("message text");` in Javascript
_EnvironCount	Limited	Always returns 0. Included for compatibility.
_FileExists	Full
_Font	Partial	Optional imageHandle parameter is not supported
_FontHeight	Full
_FontWidth	Full
_FreeFont	Full
_FreeImage	Full
_FullScreen	Partial	At present _STRETCH and _SQUAREPIXELS and _SMOOTH keywords are ignored. All calls to _FullScreen except for `_FullScreen _OFF` are equivalent to the following in QB64: `_FullScreen _SQUAREPIXELS _SMOOTH`
_G2D	Full
_G2R	Full
_Green	Partial	Optional imageHandle parameter is not supported
_Green32	Full
_Height	Full
_Hypot	Full
_Inflate$	Full
_InStrRev	Full
_KeyClear	Partial	Option 3 has no effect for buffer parameter as there is no support for INP(&H60) buffer.
_KeyDown	Full
_KeyHit	Full
_Limit	Full
_LoadFont	Partial	Optional style parameter is not supported
_LoadImage	Full
_MouseButton	Full
_MouseHide	Full
_MouseInput	Full
_MouseShow	Full	In addition to the cursorShape options from QB64, the following cursor shape options are also available: "PROGRESS", "WAIT", "MOVE", "NOT_ALLOWED", "GRAB", "GRABBING", "ZOOM_IN", "ZOOM_OUT"
_MouseWheel	Full
_MouseX	Full
_MouseY	Full
_NewImage	Full
_Numlock	Partial	Statement version not supported as browser security prevents changing the button state.
_OS$	Full	Returns WEB as the OS and the name of the browser instead of the compiler bit format (e.g. [WEB][CHROME])
_Pi	Full
_PrintMode	Partial	Optional imageHandle parameter is not supported
_PrintString	Partial	Optional imageHandle parameter is not supported
_PrintWidth	Full
_PutImage	Partial	Images are not reversed when dx2 and dy2 are greater than dx1 and dy1.
_R2D	Full
_Red	Partial	The optional imageHandle parameter is not supported
_Red32	Full
_Resize	Full
_ResizeHeight	Full
_ResizeWidth	Full
_R2G	Full
_ReadBit	Full
_ResetBit	Full
_RGB	Partial	The optional imageHandle parameter is not supported
_RGBA	Partial	The optional imageHandle parameter is not supported
_RGB32	Full
_RGBA32	Full
_Round	Full
_ScreenExists	Limited	Always returns true
_ScrollLock	Partial	Statement version not supported as browser security prevents changing the button state.
_ScreenMove	Limited	No-op. Included for compatibility.
_ScreenX	Full
_ScreenY	Full
_Sec	Full
_Sech	Full
_SetBit	Full
_Shl	Full
_Shr	Full
_Sinh	Full
_SndClose	Full
_SndLoop	Full
_SndOpen	Full
_SndPause	Full
_SndPlay	Full
_SndStop	Full
_SndVol	Full
_Source	Full
_StartDir	Full
_StrCmp	Full
_StriCmp	Full
_Tanh	Full
_Title	Full
_Title$	Full
_ToggleBit	Full
_Trim	Full
_Width	Full

QBJS Keywords

Keyword	Description
Export	Specifies a Sub, Function or Const that will be accessible in an exported module.
Import	Imports an external module for use in the calling program.
IncludeJS	Includes a javascript library for use by the current program.

QBJS Standard Modules

In an effort to provide the ability for the language to grow in a scalable, modular manner beyond the original QBasic and QB64 built-in keywords, QBJS has introduced the concept of importable modules. The bulk of features added beyond the original core keywords will be provided as standard, optional library modules which can be imported as needed.

2D Graphics

Provides extended 2D graphics functionality.

Import G2D From "lib/graphics/2d.bas"

Keyword	Description
G2D.Bezier	Draws a bezier curve.
G2D.Curve	Draws a quadratic curve.
G2D.Ellipse	Draws an ellipse.
G2D.FillCircle	Draws a filled circle.
G2D.FillRoundRect	Draws a filled rectangle with rounded corners.
G2D.FillTriangle	Draws a filled triangle.
G2D.InvertRect	Inverts the colors of a specified rectangle.
G2D.LineCap	Gets or sets the current line cap style.
G2D.LineDash	Sets a dashed style for line drawing methods.
G2D.LineDashOff	Turns off the dashed line style for subsequent drawing methods.
G2D.LineWidth	Gets or sets the current line width.
G2D.RotoZoom	Rotates and zooms an image.
G2D.RoundRect	Draws a rectangle with rounded corners.
G2D.SaveImage	Saves an image to the virtual filesystem in PNG format.
G2D.Shadow	Applies a shadow effect to subsequent drawing methods.
G2D.ShadowOff	Turns off the shadow effect for subsequent drawing methods.

Console

Provides access to the console output.

Import Console From "lib/web/console.bas"

Keyword	Description
Console.Echo	Prints a message to the console.
Console.Log	Logs a message to the console. The log level and current program source line will prefix the written log message.
Console.LogLevel	Gets or sets the current console log level.

Dom

Provides access to the current web page's document object model.

Import Dom From "lib/web/dom.bas"

Keyword	Description
Dom.Add	Adds an existing html element to a new parent element.
Dom.Alert	Instructs the browser to display a dialog with an optional message, and to wait until the user dismisses the dialog.
Dom.Confirm	Instructs the browser to display a dialog with an optional message, and to wait until the user either confirms or cancels the dialog.
Dom.Container	Returns the outermost containing html element for the QBJS application.
Dom.Create	Creates a new html element and adds it to the current page.
Dom.Event	Registers an event handler method that will be triggered when the specified event is fired.
Dom.Get	Returns an html element for a specified id.
Dom.GetImage	Returns the html canvas element associated with a QB image.
Dom.Remove	Removes an html element from the page.
Dom.Prompt	Instructs the browser to display a dialog with an optional message prompting the user to input some text, and to wait until the user either submits the text or cancels the dialog.

FileSystem

Extended functionality for input/output related to the virtual filesystem.

Import FS From "lib/io/fs.bas"

Keyword	Description
FS.DownloadFile	Downloads a file from the virtual file system.
FS.ListDirectory	Lists the contents of a directory in the virtual file system.
FS.UploadFile	Upload a file to the virtual file system.

Storage

Provides access to the browser local and session storage.

Import Storage From "lib/web/storage.bas"

Keyword	Description
Storage.Clear	Clears all values from the browser storage.
Storage.Get	Returns a value from browser storage identified by the storage key.
Storage.Key	Returns the key from browser storage identified by the key's index.
Storage.Length	Returns the number of values stored in browser storage.
Storage.Remove	Removes a value from browser storage identified by the storage key.
Storage.Set	Sets value in browser storage identified by the storage key.

QBasic Language Support
Supported Keywords
Unsupported Keywords
Samples