index Mode

To use the checkbox widget in index mode set the index attribute to a property of a DataTiddler. The checked and unchecked attributes specify the values to be assigned to the property and correspond to its checked and unchecked states respectively. The default attribute is used as a fallback value if the property is undefined.

The example below creates a checkbox that is checked if the property in the tiddler ExampleData by the name of the current tiddler is equal to selected and unchecked if the property is an empty string. If the property is undefined then it defaults to an empty string, meaning the checkbox will be unchecked if the property is missing.

<$checkbox tiddler="ExampleData" index=<<currentTiddler>> checked="selected" unchecked="" default=""> Selected?</$checkbox>