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TiddlyWiki5/editions/dev/tiddlers/new/Hook_ th-before-importing.tid

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created: 20210203184649726
modified: 20210208152038746
tags: HookMechanism
title: Hook: th-before-importing
type: text/vnd.tiddlywiki
This hook allows plugins to inspect or modify the `importTiddler` object ''before'' any tiddlers are imported. It is invoked after the final "Import" button is clicked, but ''before'' the selected tiddlers are being imported into the store.
''Intended Usecases'':
* Manipulate the import "selection state"
* Eg: create a customized "log-tiddler" that contains a heading, that should only be written once
''Important'':
* This hook ''should not'' be used to manpulate the `importTiddler.fields.text` element!
* If you want to give the users a possibility to verify the imported data, use ùpgraders like: `$:/core/modules/upgraders/` instead
* If you need to manipulate the imported tiddler content, without default user interaction, consider: [[Hook: th-importing-tiddler]] instead
The hook is part of the `NavigatorWidget.prototype.handlePerformImportEvent` function.
Hook function parameters:
* ''importTiddler'': an object, that contains information about "selected / unselected" tiddlers and more
Return value:
* ''importTiddler'': object
The hook must return the `importTiddler` object. For many usecases the object will be returned unmodified.
''Example code how to implement a hook in your project''
```
/*\
title: $:/plugins/<author>/<plugin>/th-before-importing.js
type: application/javascript
module-type: startup
YOUR DISCRCRIPTION COMES HERE!
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false, exports: true */
"use strict";
// Export name and synchronous status
exports.name = "<yournamecomesherewithoutspaces>";
exports.platforms = ["browser"];
exports.after = ["startup"];
exports.synchronous = true;
// Define your variables here!
exports.startup = function() {
$tw.hooks.addHook("th-before-importing",function(importTiddler) {
// YOUR CODE !
return importTiddler;
});
};
})();
```