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* Fix for Bug #6618 This Commit fixes Bug #6618. It is a little bit more complicated than using one tiddler to store the new value for a field. Because the following can happen: * The user types "not-a-date" into the field value of a simple text field. * The user now selects a field name that uses a HTML5 date editor. The Editor will show no date because the value cannot be parsed. * The user saves the tiddler by clicking the checkmark. Now the date-field contains the value "not-a-date" but the user was not aware that this will be added. The edit control showed no date (because the value was invalid) and the user assumed the field was empty and won't be added to the tiddler. To prevent this, every kind of field editor gets its own storage tiddler. Its name is derived from the SHA256-hash of the name of the tiddler that is returned by the Field Editor Cascade. That way every editor in the cascade is only seeing its input. As long as the default setup (with one default editor) is used, everything works like in 5.2.1. This commit also fixes the bug that the after adding a field the field-type input box was not focused again. * Update Documentation for Field Editor Cascade The fix for bug #6618 makes the handling of the tiddler backing the edit operation much more complicated. See previous commit "Fix for Bug #6618" for more details.
47 lines
4.2 KiB
Plaintext
47 lines
4.2 KiB
Plaintext
created: 20220305183700000
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modified: 20220413165500000
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tags: Concepts
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title: Customizing EditTemplate field rendering
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type: text/vnd.tiddlywiki
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When editing a tiddler the [[EditTemplate|$:/core/ui/EditTemplate/fields]] normally renders fields as simple input boxes. To modify this behaviour, the [[cascade mechanism|Cascades]] can be used. Via the [[Field Editor Cascade|Field Editor Cascade]] the name of the tiddler used for rendering the field editor can be specified. The content of this tiddler is transcluded to represent the content of the field.
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To modify the appearance of all fields whose name ends with `-date` create a new tiddler and add the `$:/tags/FieldEditorFilter` tag to it. Add a `list-before` field and assign the value `$:/config/FieldEditorFilters/default`. Now you have to put the filter for the cascade into the tiddler's text field: `[suffix[-date]then[$:/config/EditTemplateFields/Templates/dates]]`. This will transclude the tiddler named `$:/config/EditTemplateFields/Templates/dates` to render the input elements for all fields with names matching the regular expression.
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The variables `currentTiddler`, `currentField` and `currentFieldName` are set to pass information about the tiddler and field that are edited to the transcluded tiddler.
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|`currentTiddler`|The tiddler that must be used to store the field value.|
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|`currentField`|The field within the `currentTiddler` that must be used to store the field name. This is an opaque value hat may contain any field name (even `text`), use `currentFieldName` to make decisions based on the actual name of the currently edited field.|
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|`currentFieldName`|The name of the currently edited field.|
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For example, a tiddler containing the following WikiText would render the field as an HTML input element of the type `date`. This will show a date picker for the fields on all modern browsers:
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```
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<$edit-text tiddler=<<currentTiddler>> field=<<currentField>> tag="input" type="date" class="tc-edit-texteditor tc-edit-fieldeditor" placeholder="Set your date" tabindex={{$:/config/EditTabIndex}} cancelPopups="yes"/>
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```
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<<.warning "The `currentField` variable will be set to `text` for new fields. Make sure that your editor will handle this correctly. For example, by setting the `tag` attribute on the EditTextWidget. If you want to know the name of the currently edited/added field, use the `currentFieldName` variable.">>
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The `tabindex` and `cancelPopups` attributes make sure the HTML input element behaves exactly the default elements provided by TiddlyWiki.
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Not only the EditTextWidget can be used. A tiddler containing the following WikiText will render the field as a drop-down-list that allows the user to select the name of a tiddler. The name of the selected tiddler will be stored in the field.
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```
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<$select tiddler=<<currentTiddler>> field=<<currentField>> class="tc-edit-texteditor tc-edit-fieldeditor" cancelPopups="yes">
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<$list filter='[all[tiddlers]sort[title]]'>
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<option value=<<currentTiddler>>><$view field='title'/></option>
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</$list>
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</$select>
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```
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The classes `tc-edit-texteditor` and `tc-edit-fieldeditor` should be used to style the `input` and `select` elements to match the theme of the TiddlyWiki installation.
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! Persistence of values when creating fields
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When using multiple field editors for creating fields within the [[EditTemplate|$:/core/ui/EditTemplate/fields]], every field editor tiddler returned by the [[Field Editor Cascade|Field Editor Cascade]] gets its own storage tiddler. This is done to prevent problems with incompatible values when the user is switching between fields governed by different field editors.
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!! Example
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There is a cascade that returns a special field editor for all fields starting with the string "my-". All other fields use the default field editor.
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If you type a new value into the "field value" input box and select any field not starting with "my-", the value will be kept.
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If you switch to a field, that starts with "my-", the "field value" input field will be empty again because a new type of field editor is used. If you now type a value and switch to another field starting with "my-" the value will be kept. If you switch to a field that does not start with "my-" the previously typed value (that was stored for the default editor) will reappear. |