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Computing with ioLProgrammer's GuideLanguage Reference

abs tag   add tag   align field   and tag   array tag   audio tag   backgroundColor field   bold field   border field   borderBottom field   borderColor field   borderLeft field   borderRight field   borderStyle field   borderTop field   bottom field   box tag   button tag   carat field   checkBox tag   choiceBox tag   class tag   clear tag   clientFrame tag   color field   console tag   dialog tag   div tag   do field   ellipse tag   else field   eq tag   false tag   focus field   focusOrder field   font field   for tag   ge tag   gt tag   height field   hotKey field   if tag   img tag   inf tag   inline field   input tag   invalid tag   int tag   italic field   join tag   layer field   le tag   left field   limit field   line tag   lt tag   margin field   marginBottom field   marginLeft field   marginRight field   marginTop field   mod tag   mul tag   ne tag   neg tag   not tag   null tag   num tag   onClear field   onClick field   onCommit field   onContextClick field   onExit field   onFocus field   onGet field   onKeyDown field   onKeyPress field   onKeyUp field   onMouseDown field   onMouseIn field   onMouseMove field   onMouseOut field   onMouseUp field   onPull field   onPush field   onResize field   onTimer field   openLink tag   or tag   pivot field   playing field   put tag   putError tag   putLn tag   requestTransfer tag   right field   rotate field   scalar tag   scroll field   scrollPos field   selectable field   spacing field   spacingBottom field   spacingLeft field   spacingRight field   spacingTop field   span tag   split tag   sub tag   table tag   tabRow tag   then field   timer tag   top field   transfer tag   transferAbility tag   transition field   true tag   underline field   vector tag   video tag   visible field   void tag   width field   with field   xor tag


visible field

Category: scalar field

Specifies whether an object should currently be rendered to the screen, or hidden from the user. If this field is not specified, the object will be visible by default.

Applies to...

box, button, checkBox, choiceBox, clientFrame, ellipse, img, input, line, span, table, tabRow, video

Behaviour

This field takes a single boolean value:

ValueDescription
true the field property is enabled for this tag
false the field property is disabled for this tag
null the field is left unspecified. Default behaviour applies.

All presentation tags are visible by default. Setting the visisble field to false allows it to be hidden, meaning it will not be rendered in the console, will not take up space on the screen, and will be removed from the display if it was already visible. Setting the field to true allows a previously hidden tag to be displayed on the screen.

To make use of this field within a tag, it must be defined with an initial value when the tag is created (even if it is initially set as visible=null). Otherwise the presentation tag will be created without a visible field and you will not be able to directly alter that tag's visibility afterwards.

Note: Many tags will progressively update their display as content is pushed into them. For content-heavy elements such as tables, this can lead to slow rendering as the entire table is re-rendered several times before it is complete.
The visible field can be used to improve performance in such cases, by ensuring a content-heavy tag is not rendered on the screen until all its content is in place. This can be done by setting visible=false in the tag before content is added and then changing the visible field to true after all its content has been added.