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The ButtonWidget documentation refers to a "state" attribute, but this should probably be "set". The name "state" appears to be an artifact from when the setTitle, setField, and setIndex attributes were added to the widget; at one time they were called stateTitle and so on, and then they were renamed to setTitle instead, but not every instance of "state" was found and renamed to "set". This is one such instance, now fixed.
63 lines
4.3 KiB
Plaintext
63 lines
4.3 KiB
Plaintext
caption: button
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created: 20131024141900000
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modified: 20200131171028279
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tags: Widgets
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title: ButtonWidget
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type: text/vnd.tiddlywiki
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! Introduction
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The button widget displays an HTML `<button>` element that can perform a combination of optional actions when clicked:
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* Executing any ActionWidgets passed in the `actions` attribute
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* Executing any ActionWidgets that are immediate children of the button widget
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* Execute any integrated actions:
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** Navigate to a specified tiddler
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** Dispatch a user defined [[widget message|Messages]]
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** Trigger a user defined [[popup|PopupMechanism]]
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** Assign new text to a specified tiddler
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The integrated actions are provided as a shortcut for invoking common actions. The same functionality is available via ActionWidgets, with the exception of the support for highlighting selected popups.
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! Content and Attributes
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The content of the `<$button>` widget is displayed within the button.
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|!Attribute |!Description |
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|actions |A string containing ActionWidgets to be triggered when the key combination is detected |
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|to |The title of the tiddler to navigate to |
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|message |The name of the [[widget message|Messages]] to send when the button is clicked |
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|param |The optional parameter to the message |
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|set |A TextReference to which a new value will be assigned |
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|setTitle |A title to which a new value will be assigned, ''without'' TextReference. Gets preferred over <<.attr set>> |
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|setField |A ''field name'' to which the new value will be assigned, if the attribute <<.attr setTitle>> is present. Defaults to the ''text'' field |
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|setIndex |An ''index'' to which the new value will be assigned, if the attribute <<.attr setTitle>> is present |
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|setTo |The new value to assign to the TextReference identified in the `set` attribute or the text field / the field specified through <<.attr setField>> / the index specified through <<.attr setIndex>> of the title given through <<.attr setTitle>> |
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|selectedClass |An optional additional CSS class to be assigned if the popup is triggered or the tiddler specified in <<.attr set>> already has the value specified in <<.attr setTo>> |
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|default |Default value if <<.attr set>> tiddler is missing for testing against <<.attr setTo>> to determine <<.attr selectedClass>> |
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|popup |Title of a state tiddler for a popup that is toggled when the button is clicked. See PopupMechanism for details |
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|popupTitle |Title of a state tiddler for a popup that is toggled when the button is clicked. In difference to the <<.attr popup>> attribute, ''no'' TextReference is used. See PopupMechanism for details |
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|aria-label |Optional [[Accessibility]] label |
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|tooltip |Optional tooltip |
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|class |An optional CSS class name to be assigned to the HTML element|
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|style |An optional CSS style attribute to be assigned to the HTML element |
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|tag |An optional html tag to use instead of the default "button" |
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|dragTiddler |An optional tiddler title making the button draggable and identifying the payload tiddler. See DraggableWidget for details |
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|dragFilter |An optional filter making the button draggable and identifying the list of payload tiddlers. See DraggableWidget for details |
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|tabindex |Sets the `tabindex` attribute of the button to the given value |
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''Note:'' In almost all other cases where a TextReference is used as a widget attribute, it will be placed between curly brackets, to [[transclude|Transclusion in WikiText]] the value currently stored there. However, when we use a TextReference as the value of a button widget's <<.attr set>> attribute, we are referencing //the storage location itself//, rather than the value stored there, so we do ''not'' use curly brackets there. //Example:// we could code a button widget that sets the `caption` field of TiddlerA to be the same as that of TiddlerB as:
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<<.tip """<$macrocall $name=".from-version" version="5.1.18"/> <$macrocall $name=".attr" _="setTitle"/>, <$macrocall $name=".attr" _="setField"/> and <$macrocall $name=".attr" _="setIndex"/> attributes allow specifying Tiddler states ''directly'', without interpreting them as [[TextReferences|TextReference]].
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This is useful for edge-cases where titles may contain characters that are used to denote Tiddler fields or indices (`!!`, `##`)""">>
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```
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<$button set="TiddlerA!!caption" setTo={{TiddlerB!!caption}} >
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Press me!
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</$button>
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```
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''Tip:'' Set ''class'' to `tc-btn-invisible tc-tiddlylink` to have a button look like an internal link.
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