Head and feet

The data table supports filling the head and foot blocks as you wish.

$grid->header(function ($collection) {
    return 'header';
});

$grid->footer(function ($collection) {
    return 'footer'; 
});

The parameter $collection of the closure function is Illuminate\Support\Collection class instance, which is the current page table data, the following is an example of the use of two different scenarios

Head

$grid->header(function ($collection) use ($grid) {
    $query = Model::query();

    // Get the table filter where the conditional array is traversed.
    $grid->model()->getQueries()->unique()->each(function ($value) use (&$query) {
        if (in_array($value['method'], ['paginate', 'get', 'orderBy', 'orderByDesc'], true)) {
            return;
        }

        $query = call_user_func_array([$query, $value['method']], $value['arguments'] ?? []);
    });

    // Identify statistical data
    $data = $query->get();

    // Custom component
    return new Card($data);
});

Component implementation for custom header display

<?php

use Illuminate\Contracts\Support\Renderable;
use Dcat\Admin\Admin;

class Card implements Renderable
{
    public static $js = [
        'xxx/js/card.min.js',
    ];
    public static $css = [
        'xxx/css/card.min.css',
    ];

    protected $data;

    public function __construct($data) 
    {
        $this->data = $data;
    }

    public function script()
    {
        return <<<JS
        console.log('All JS scripts are loaded.');
        $('xxx').card();
JS;     
    }

    public function render()
    {
        // You can introduce your js or css file here.
        Admin::js(static::$js);
        Admin::css(static::$css);

        // JS code to be executed on the page
        // The JS code set by Admin::script will be executed automatically when all JS scripts are loaded.
        Admin::script($this->script());

        return view('...', ['data' => $this->data])->render();
    }
}

Footer

A more common scenario is to display statistics in the footer of a data form, such as adding revenue statistics to the footer of an order form, which can be implemented with the following code.

$grid->footer(function ($collection) use ($grid) {
    $query = Model::query();

    // Get the table to filter the where condition array for iterations
    $grid->model()->getQueries()->unique()->each(function ($value) use (&$query) {
        if (in_array($value['method'], ['paginate', 'get', 'orderBy', 'orderByDesc'], true)) {
            return;
        }

        $query = call_user_func_array([$query, $value['method']], $value['arguments'] ?? []);
    });

    // Identifying statistics
    $data = $query->get();

    return "<div style='padding: 10px;'>gross income ： $data</div>";
});

If there is a more complex footer that needs to be displayed, you can also use a view object or wrap it into a class.