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a9c4f113a1
* Made the link between "names" and "properties" explicit (I only figured it out by reading the TextReference documentation) * Documented named property manipulation through ActionWidgets.
34 lines
1.3 KiB
Plaintext
34 lines
1.3 KiB
Plaintext
created: 201308291647
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modified: 201308291647
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tags: Concepts
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title: DataTiddlers
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A data tiddler is a miniature database contained within a tiddler.
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There are two standard formats:
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* DictionaryTiddlers
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* [[JSONTiddlers]]
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Other formats of tiddler can also be parsed to yield blocks of data that behave like data tiddlers.
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Use a TextReference to look up the value of a named property. For example, if a [[DictionaryTiddler|DictionaryTiddlers]] called `MonthDays` contains:
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```
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oct:31
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nov:30
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dec:31
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```
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... then `{{MonthDays##nov}}` will resolve to the value `30`.
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The same is true if `MonthDays` is a [[JSONTiddler|JSONTiddlers]] with the following content:
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```
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{"oct":31,"nov":30,"dec":31}
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```
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Note: //It is currently only possible to retrieve data from the immediate properties of the root object of a JSONTiddler.//
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The widgets ActionSetFieldWidget and ActionListopsWidget can manipulate named properties of data tiddlers by indicating the name of the property in the $index attribute. To create or modify a named property with ActionSetFieldWidget, provide a $value attribute. To delete a named property with ActionSetFieldWidget, omit the $value attribute. ActionListopsWidget assigns the named property the list constructed through its $filter and $subfilter attributes.
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