INPUT / OUTPUT / LANGUAGE

Computing with ioLProgrammer's GuideLanguage Reference

＃ operator ? operator @ operator 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 editable field ellipse tag else field eq tag false tag focus field focusOrder field font field for tag format field 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 onContextClick field onExit field onFocus field onGet field onInput field onKeyDown field onSet 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 wrap field xor tag

for tag

Transient logic tag

Creates a loop in the document tree. Code inside the loop is invoked repeatedly for a specified number of iterations.

Sample usage

<i:for 1 limit=10 do=i> yields the list of numbers 1 2 3 4 5 6 7 8 9 10

Fields

Primary field

The counter value of the current iteration. Can be initialised to the required starting value. The default starting value is 1.

Secondary fields

do: the code to invoke repeatedly, for each iteration of the loop.
limit: the counter value of the final iteration. The loop will terminate after this iteration is invoked.

Notes

A for loop executes synchronously and user interaction is not possible while a loop is running.
An alternative to the for loop that works asynchronously is the timer tag, which also invokes code repeatedly, except the code is invoked by a repeating time interval event which allows for user interaction between iterations.
To avoid degrading the user experience, synchronous looping within ioL is limited to 4096 contiguous iterations at a time (this number may vary between machine architectures and includes interations created by nested loops). To keep the user interface responsive, any significant data processing and computation should instead be done natively by the app itself, not within the user's interface.