Class Atk4\Ui\Table\Column\NoValue

`extends`	`Column`

Sometime we need null values in DB. When we display values we have holes with NoValue decorator we can show a display value for column null value.

$this->addField('field', [ [...] 'ui' => [ [...], 'table' => [ 'NoValue', ' if empty display this value ' ], ], ]);

Located at ui/src/Table/Column/NoValue.php

Methods
`public`	`getHtmlTags(Model $row, ?Field $field): array` Return associative array of tags to be filled with pre-rendered HTML on a column-basis. Will not be invoked if HTML… Return associative array of tags to be filled with pre-rendered HTML on a column-basis. Will not be invoked if HTML output is turned off for the table. Overrides `Atk4\Ui\Table\Column::getHtmlTags()`	#

Methods inherited from Atk4\Ui\Table\Column
`__construct(), addPopup(), setHeaderPopup(), setHeaderPopupIcon(), addDropdown(), setHeaderDropdown(), addClass(), setAttr(), getTagAttributes(), getTag(), getHeaderCellHtml(), getTotalsCellHtml(), getDataCellHtml(), getDataCellTemplate(), getOwner()`

Methods used from Atk4\Core\AppScopeTrait
`assertInstanceOfApp(), issetApp(), getApp(), setApp()`

Methods used from Atk4\Core\DiContainerTrait
`setDefaults(), setMissingProperty(), assertInstanceOf(), _fromSeedPrecheck(), fromSeed(), fromSeedUnsafe()`

Methods used from Atk4\Core\InitializerTrait
`init(), isInitialized(), assertIsInitialized(), invokeInit()`

Methods used from Atk4\Core\TrackableTrait
`issetOwner(), setOwner(), unsetOwner(), getDesiredName(), destroy()`

Constants inherited from Atk4\Ui\Table\Column
`HOOK_GET_HTML_TAGS, HOOK_GET_HEADER_CELL_HTML`

Properties
`public`	`string`	`$noValue = ' --- '`	#

Properties inherited from Atk4\Ui\Table\Column
`$table, $attr, $caption, $sortable, $columnData, $hasHeaderAction, $headerActionTag`

Properties used from Atk4\Core\AppScopeTrait
`$_app, $maxNameLength, $uniqueNameHashes`

Properties used from Atk4\Core\InitializerTrait
`$_initialized`

Properties used from Atk4\Core\NameTrait
`$name`

Properties used from Atk4\Core\TrackableTrait
`$_owner, $shortName`