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https://github.com/Jermolene/TiddlyWiki5
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68 lines
1.9 KiB
Plaintext
68 lines
1.9 KiB
Plaintext
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created: 20210203184649726
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modified: 20210208152038746
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tags: HookMechanism
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title: Hook: th-before-importing
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type: text/vnd.tiddlywiki
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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.
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''Intended Usecases'':
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* Manipulate the import "selection state"
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* Eg: create a customized "log-tiddler" that contains a heading, that should only be written once
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''Important'':
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* This hook ''should not'' be used to manpulate the `importTiddler.fields.text` element!
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* If you want to give the users a possibility to verify the imported data, use ùpgraders like: `$:/core/modules/upgraders/` instead
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* If you need to manipulate the imported tiddler content, without default user interaction, consider: [[Hook: th-importing-tiddler]] instead
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The hook is part of the `NavigatorWidget.prototype.handlePerformImportEvent` function.
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Hook function parameters:
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* ''importTiddler'': an object, that contains information about "selected / unselected" tiddlers and more
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Return value:
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* ''importTiddler'': object
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The hook must return the `importTiddler` object. For many usecases the object will be returned unmodified.
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''Example code how to implement a hook in your project''
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```
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/*\
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title: $:/plugins/<author>/<plugin>/th-before-importing.js
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type: application/javascript
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module-type: startup
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YOUR DISCRCRIPTION COMES HERE!
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false, exports: true */
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"use strict";
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// Export name and synchronous status
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exports.name = "<yournamecomesherewithoutspaces>";
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exports.platforms = ["browser"];
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exports.after = ["startup"];
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exports.synchronous = true;
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// Define your variables here!
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exports.startup = function() {
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$tw.hooks.addHook("th-before-importing",function(importTiddler) {
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// YOUR CODE !
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return importTiddler;
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});
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};
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})();
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```
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