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Computing with ioLProgrammer's GuideLanguage Reference

＃ operator? operator@ operatorabs tagadd tagalign fieldand tagarray tagaudio tagbackgroundColor fieldbold fieldborder fieldborderBottom fieldborderColor fieldborderLeft fieldborderRight fieldborderStyle fieldborderTop fieldbottom fieldbox tagbutton tagcarat fieldcheckBox tagchoiceBox tagclass tagclear tagclientFrame tagcolor fieldconsole tagdialog tagdiv tagdo fieldeditable fieldellipse tagelse fieldeq tagfalse tagfocus fieldfocusOrder fieldfont fieldfor tagformat fieldge taggt tagheight fieldhotKey fieldif tagimg taginf taginline fieldinput taginvalid tagint tagitalic fieldjoin taglayer fieldle tagleft fieldlimit fieldline taglt tagmargin fieldmarginBottom fieldmarginLeft fieldmarginRight fieldmarginTop fieldmod tagmul tagne tagneg tagnot tagnull tagnum tagonClear fieldonClick fieldonContextClick fieldonExit fieldonFocus fieldonGet fieldonInput fieldonKeyDown fieldonSet fieldonKeyPress fieldonKeyUp fieldonMouseDown fieldonMouseIn fieldonMouseMove fieldonMouseOut fieldonMouseUp fieldonPull fieldonPush fieldonResize fieldonTimer fieldopenLink tagopacity fieldor tagpivot fieldplaying fieldput tagputError tagputLn tagrequestTransfer tagright fieldrotate fieldscalar tagscroll fieldscrollPos fieldselectable fieldsize fieldspacing fieldspacingBottom fieldspacingLeft fieldspacingRight fieldspacingTop fieldspan tagsplit tagsub tagtable tagtabRow tagthen fieldtimer tagtop fieldtransfer tagtransferAbility tagtransition fieldtrue tagunderline fieldvector tagvideo tagvisible fieldvoid tagwidth fieldwith fieldwrap fieldxor tag

opacity field

Scalar field

Makes a tag and everything inside it see-through.

Applies to...

Sample usage

<box opacity=0.5 {Half there}> shows the box, its border and its text half see-through.
<msg:box opacity=1 transition=1,{s} {Goodbye}>, then later <msg.opacity 0>, fades the box out over one second.

Behaviour

Takes a number from 0 to 1. At 1 (the default) the tag is solid. At 0 it's invisible, and whatever is behind it shows through. In between, the tag is blended with what's behind it: at 0.5, half and half.

opacity applies to the whole tag: its background, border, text and any tags inside it, all together. To make just one colour see-through, such as a background, give that colour an alpha instead (see backgroundColor).

Numbers below 0 are shown as 0, and numbers above 1 as 1. A value that isn't a number, or null, shows the tag solid. Reading the field gives back the value that was assigned.

An invisible tag still takes up its space in the layout. To remove a tag from view altogether, use the visible field.

With a transition field, changing it later fades the tag smoothly instead of all at once.

See also