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Note: build.sh updated to make sure that test:help build action:target doesn't also call test.sh by adding `:_all` meta-target. Note: CI will need a new help-keyman-com.sh build step to deploy web engine help. Fixes: #12347
57 lines
1.2 KiB
Markdown
57 lines
1.2 KiB
Markdown
---
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title: deleteContext (KDC)
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---
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## Summary
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Context deletion - removes the specified number of deadkeys and characters from before the caret.
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## Syntax
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```c
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keyman.interface.deleteContext(dn, Pelem);
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```
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or
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```c
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KeymanWeb.KDC(n, Pelem); // Shorthand
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```
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### Parameters
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`dn`
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: Type: `number`
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: The number of entries (deadkeys, characters) to be deleted from the current context.
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`Pelem`
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: Type: `Element`
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: The element being operated upon.
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### Return Value
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`undefined`
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## Description
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This is a core element of keyboard input management within KeymanWeb introduced with version 10. It is utilized to manage the deletion of context in a deadkey-aware manner, in parallel to [`keyman.interface.fullContextMatch`](fullContextMatch). For comparison with [Developer 'rules'](/developer/language/guide/rules) from keyboard source code...
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```keyman
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store(pair_1) 'uU'
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store(pair_2) 'lL'
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c Lots of keyboard rules...
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'nul' dk(nothing) + '.' > nul
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```
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would have a rule output as follows:
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```c
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// Context is length four (three characters + one deadkey), so we delete all four.
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keyman.interface.deleteContext(4, element);
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```
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## See also
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- [`keyman.interface.fullContextMatch()`](fullContextMatch)
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