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https://github.com/Jermolene/TiddlyWiki5
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7492086f31
Attempted a fix for the problem I raised in #2038, by adding an explanation of why a TextReference in a button widget's 'set' attribute will lack the curly braces seen nearly anywhere else a TextReference is used as a widget attribute.
51 lines
2.6 KiB
Plaintext
51 lines
2.6 KiB
Plaintext
caption: button
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created: 20131024141900000
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modified: 20150619111219516
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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 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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|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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|setTo |The new value to assign to the TextReference identified in the `set` attribute |
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|popup |Title of a state tiddler for a popup that is toggled when the button is clicked |
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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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|selectedClass |An optional additional CSS class to be assigned if the popup is triggered or the tiddler specified in `set` already has the value specified in `setTo` |
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|tag |An optional html tag to use instead of the default "button" |
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|default |Default value if `set` tiddler is missing for testing against `setTo` to determine `selectedClass` |
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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 `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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```
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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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