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TiddlyWiki5/editions/dev/tiddlers/new/th-saving-tiddler.tid

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created: 20150908150314994
modified: 20200618114855781
tags: HookMechanism
title: Hook: th-saving-tiddler
type: text/vnd.tiddlywiki
This hook allows plugins to inspect or modify tiddlers before they are saved via the ''confirm'' toolbar button; the hook is not invoked for tiddlers that are saved through other means, such as state tiddlers created by the ActionSetFieldWidget.
Hook function parameters:
* ''newTiddler'': tiddler object about to be saved
* ''oldTiddler'': tiddler object of draft tiddler that is being saved (from v5.1.23)
Return value:
* tiddler object to be saved
The original tiddler object can be returned unmodified by the hook. If the hook needs to modify the tiddler then it should return a new tiddler object, for example:
```
return new $tw.Tiddler(tiddler,{"my-field": value});
```
Hooks must not change the ''title'' field but can freely modify any other field of the tiddler.