nested.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\UI\examples\Input\Field\Section;
 
function nested()
{
    // Step 0: Declare dependencies
    global $DIC;
    $ui = $DIC->ui()->factory();
    $renderer = $DIC->ui()->renderer();
 
    // Step 1: Define inputs for the innermost section
    $text_input = $ui->input()->field()->text("Text Input", "Enter some text here.");
    $multi_select = $ui->input()->field()->multiselect(
        "Multi-Select",
        [
            "1" => "Option 1",
            "2" => "Option 2",
            "3" => "Option 3",
        ],
        "Choose one or more options"
    );
 
    $inner_section = $ui->input()->field()->section(
        [$text_input, $multi_select],
        "Inner Section",
        "This is the innermost section."
    )->withRequired(true);
 
    // Step 2: Define inputs for the middle section
    $dropdown = $ui->input()->field()->select(
        "Dropdown",
        [
            "1" => "Choice 1",
            "2" => "Choice 2",
            "3" => "Choice 3",
        ],
        "Select a single choice"
    );
 
    $middle_section = $ui->input()->field()->section(
        [$dropdown, $inner_section],
        "Middle Section",
        "This section contains the inner section and a dropdown."
    );
 
    // Step 3: Define the outer section
    $number_input = $ui->input()->field()->numeric("Numeric Input", "Enter a number.");
    $outer_section = $ui->input()->field()->section(
        [$number_input, $middle_section],
        "Outer Section",
        "This is the top-level section containing all other sections."
    );
 
    // Step 4: Define the form and attach the outer section
    $form = $ui->input()->container()->form()->standard("#", [$outer_section]);
 
    // Step 5: Render the form (no submission or processing, purely for display)
    return $renderer->render($form);
}