# Customization Examples¶

Many extracts can be found throughout the manual, but this section provides more complete examples.

## Example 1: Extending the fe_users table¶

The “examples” extension adds two fields to the “fe_users” table. Here’s the complete code, taken from file Configuration/TCA/Overrides/fe_users.php:

<?php
defined('TYPO3') or die();

// Add some fields to fe_users table to show TCA fields definitions
[
'tx_examples_options' => [
'exclude' => 0,
'label' => 'LLL:EXT:examples/Resources/Private/Language/locallang_db.xlf:fe_users.tx_examples_options',
'config' => [
'type' => 'select',
'renderType' => 'selectSingle',
'items' => [
['',0,],
['LLL:EXT:examples/Resources/Private/Language/locallang_db.xlf:fe_users.tx_examples_options.I.0',1,],
['LLL:EXT:examples/Resources/Private/Language/locallang_db.xlf:fe_users.tx_examples_options.I.1',2,],
['LLL:EXT:examples/Resources/Private/Language/locallang_db.xlf:fe_users.tx_examples_options.I.2','--div--',],
['LLL:EXT:examples/Resources/Private/Language/locallang_db.xlf:fe_users.tx_examples_options.I.3',3,],
],
'size' => 1,
'maxitems' => 1,
],
],
'tx_examples_special' => [
'exclude' => 0,
'label' => 'LLL:EXT:examples/Resources/Private/Language/locallang_db.xlf:fe_users.tx_examples_special',
'config' => [
'type' => 'user',
// renderType needs to be registered in ext_localconf.php
'renderType' => 'specialField',
'parameters' => [
'size' => '30',
'color' => '#F49700',
],
],
],
]
);
'fe_users',
'tx_examples_options, tx_examples_special'
);


Note

The second example tx_examples_special only works when the renderType has been registered implemented and then registered in the ext_localconf.php. Please refer to the the following chapter of the TCA reference on how to implement it: t3tca:columns-user.

In this example the first method call adds fields using ExtensionManagementUtility::addTCAcolumns(). This ensures that the fields are registered in $GLOBALS['TCA']. Parameters: 1. Name of the table to which the fields should be added. 2. An array of the fields to be added. Each field is represented in the TCA syntax for columns. Since the fields are only registered but not used anywhere, the fields are afterwards added to the “types” definition of the fe_users table by calling ExtensionManagementUtility::addToAllTCAtypes(). Parameters: 1. Name of the table to which the fields should be added. 2. Comma-separated string of fields, the same syntax used in the showitem property of types in TCA. 3. Optional: record types of the table where the fields should be added, see types in TCA for details. 4. Optional: position ('before' or 'after') in relation to an existing field. So you could do this: EXT:some_extension/Configuration/TCA/Overrides/fe_users.php \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addToAllTCAtypes( 'fe_users', 'tx_examples_options, tx_examples_special', '', 'after:password' );  If the fourth parameter (position) is omitted or the specified field is not found, new fields are added at the bottom of the form. If the table uses tabs, new fields are added at the bottom of the Extended tab. This tab is created automatically if it does not exist. These method calls do not create the corresponding fields in the database. The new fields must also be defined in the ext_tables.sql file of the extension: EXT:some_extension/ext_tables.sql  CREATE TABLE fe_users ( tx_examples_options int(11) DEFAULT '0' NOT NULL, tx_examples_special varchar(255) DEFAULT '' NOT NULL );  Note The above example uses the SQL CREATE TABLE statement. This is the way TYPO3 expects it to be. The Extension Manager will automatically transform this into an ALTER TABLE statement when it detects that the table already exists. The following screen shot shows the placement of the two new fields when editing a “fe_users” record: The next example shows how to place a field more precisely. ## Example 2: Extending the tt_content Table¶ In the second example, we will add a “No print” field to all content element types. First of all, we add its SQL definition in ext_tables.sql: EXT:some_extension/ext_tables.sql  CREATE TABLE tt_content ( tx_examples_noprint tinyint(4) DEFAULT '0' NOT NULL );  Then we add it to the $GLOBALS['TCA'] in Configuration/TCA/Overrides/tt_content.php:

EXT:some_extension/Configuration/TCA/Overrides/tt_content.php
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns(
'tt_content',
[
'tx_examples_noprint' => [
'exclude' => 0,
'label' => 'LLL:EXT:examples/Resources/Private/Language/locallang_db.xlf:tt_content.tx_examples_noprint',
'config' => [
'type' => 'check',
'renderType' => 'checkboxToggle',
'items' => [
[
0 => '',
1 => ''
]
],
],
],
]
);
'tt_content',
'access',
'tx_examples_noprint',
'before:editlock'
);


The code is mostly the same as in the first example, but the last method call is different and requires an explanation. The tables pages and tt_content use palettes extensively. This increases flexibility.

Therefore we call ExtensionManagementUtility::addFieldsToPalette() instead of ExtensionManagementUtility::addToAllTCAtypes(). We need to specify the palette’s key as the second argument (access). Precise placement of the new field is achieved with the fourth parameter (before:editlock). This will place the “no print” field right before the Restrict editing by non-Admins field, instead of putting it in the Extended tab.

The result is the following:

Note

Obviously this new field will not magically exclude a content element from being printed. For it to have any effect, it must be used during the rendering by modifying the TypoScript used to render the tt_content table. Although this is outside the scope of this manual, here is an example of what you could do, for the sake of showing a complete process.

Assuming you are using “fluid_styled_content” (which is installed by default), you could add the following TypoScript to your template:

tt_content.stdWrap.outerWrap = <div class="noprint">|</div>
tt_content.stdWrap.outerWrap.if.isTrue.field = tx_examples_noprint


This will wrap a “div” tag with a “noprint” class around any content element that has its “No print” checkbox checked. The final step would be to declare the appropriate selector in the print-media CSS file so that “noprint” elements don’t get displayed.

This is just an example of how the effect of the “No print” checkbox can be ultimately implemented. It is meant to show that just adding the field to the \$GLOBALS['TCA'] is not enough.