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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


clear tag

Category: ephemeral logic tag

Clears the parent field.

Sample usage

<clear>

Fields

Behaviour

This tag's Behaviour is equivalent to using the .clear operator on the parent field. It clears the contents of its immediate parent field, and the tag's lifetime then ends.

For example, using the <clear> tag at the top level is equivalent to using <console.clear>, and clears the entire contents of the console.

The onClear event will be invoked on the parent field, if it is defined. Otherwise the onCommit event will be invoked if it is defined.

Example

The following example shows how a program might create a box on the screen to display log messages, and open up a 'push environment' where, for a while, all output from the program goes into that box.

At some point, the program wants to clear the log messages, so it outputs <clear>, and the primary field of the box is cleared ready for fresh log messages.

<logOutput:box>

. . .  <! stuff happens here !>

<logOutput.push {

. . .

Creating user account...</n>
Loading game matrix...</n>
Building world...</n>
Prepare for battle...</n>
<clear>
Welcome Player One.
Target approaching.

. . .

}>