Introduction
The button widget displays an HTML <button> element that can perform a combination of optional actions when clicked:
- Executing any ActionWidgets passed in the
actionsattribute - Executing any ActionWidgets that are immediate children of the button widget
- Execute any integrated actions:
- Navigate to a specified tiddler
- Dispatch a user defined widget message
- Trigger a user defined popup
- Assign new text to a specified tiddler
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.
Content and Attributes
The content of the <$button> widget is displayed within the button.
| Attribute | Description |
|---|---|
| actions | A string containing ActionWidgets to be triggered when the key combination is detected. Introduced in v5.1.23 the modifier variable lists the modifier keys that are pressed when the action is invoked. The possible modifiers are ctrl, ctrl-alt, ctrl-shift, alt, alt-shift, shift and ctrl-alt-shift |
| to | The title of the tiddler to navigate to |
| message | The name of the widget message to send when the button is clicked |
| param | The optional parameter to the message |
| set | A TextReference to which a new value will be assigned |
| setTitle | A title to which a new value will be assigned, without TextReference. Gets preferred over set |
| setField | A field name to which the new value will be assigned, if the attribute setTitle is present. Defaults to the text field |
| setIndex | An index to which the new value will be assigned, if the attribute setTitle is present |
| setTo | The new value to assign to the TextReference identified in the set attribute or the text field / the field specified through setField / the index specified through setIndex of the title given through setTitle |
| 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 |
| default | Default value if set tiddler is missing for testing against setTo to determine selectedClass |
| popup | Title of a state tiddler for a popup that is toggled when the button is clicked. See PopupMechanism for details |
| popupTitle | Title of a state tiddler for a popup that is toggled when the button is clicked. In difference to the popup attribute, no TextReference is used. See PopupMechanism for details |
| popupAbsCoords | Introduced in v5.2.4 If set to yes writes absolute coordinates to the tiddler referenced by the popup. If set to no (the default) uses relative coordinates. See Coordinate Systems for details |
| aria-label | Optional Accessibility label |
| tooltip | Optional tooltip |
| class | An optional CSS class name to be assigned to the HTML element |
| data-* | New in v5.3.2 Optional data attributes to be assigned to the HTML element |
| style.* | New in v5.3.2 Optional CSS properties to be assigned to the HTML element |
| style | An optional CSS style attribute to be assigned to the HTML element |
| tag | An optional html tag to use instead of the default "button" |
| dragTiddler | An optional tiddler title making the button draggable and identifying the payload tiddler. See DraggableWidget for details |
| dragFilter | An optional filter making the button draggable and identifying the list of payload tiddlers. See DraggableWidget for details |
| tabindex | Sets the tabindex attribute of the button to the given value |
| disabled | Introduced in v5.1.23 Optional, disables the button if set to "yes". Defaults to "no" |
Note: In almost all other cases where a TextReference is used as a widget attribute, it will be placed between curly brackets, to transclude 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:
<$button set="TiddlerA!!caption" setTo={{TiddlerB!!caption}} >
Press me!
</$button>Tip: Set class to tc-btn-invisible tc-tiddlylink to have a button look like an internal link.