图表 Widget - Widget

Introduction

Filament comes with many “chart” widget templates, which you can use to display real-time, interactive charts.

Start by creating a widget with the command:

php artisan make:filament-widget BlogPostsChart --chart

There is a single ChartWidget class that is used for all charts. The type of chart is set by the getType() method. In this example, that method returns the string 'line'.

The protected ?string $heading variable is used to set the heading that describes the chart. If you need to set the heading dynamically, you can override the getHeading() method.

The getData() method is used to return an array of datasets and labels. Each dataset is a labeled array of points to plot on the chart, and each label is a string. This structure is identical to the Chart.js library, which Filament uses to render charts. You may use the Chart.js documentation to fully understand the possibilities to return from getData(), based on the chart type.

<?php

namespace App\Filament\Widgets;

use Filament\Widgets\ChartWidget;

class BlogPostsChart extends ChartWidget
{
    protected ?string $heading = 'Blog Posts';

    protected function getData(): array
    {
        return [
            'datasets' => [
                [
                    'label' => 'Blog posts created',
                    'data' => [0, 10, 5, 2, 21, 32, 45, 74, 65, 45, 77, 89],
                ],
            ],
            'labels' => ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
        ];
    }

    protected function getType(): string
    {
        return 'line';
    }
}

Now, check out your widget in the dashboard.

Available chart types

Below is a list of available chart widget classes which you may extend, and their corresponding Chart.js documentation page, for inspiration on what to return from getData():

Bar chart - Chart.js documentation
Bubble chart - Chart.js documentation
Doughnut chart - Chart.js documentation
Line chart - Chart.js documentation
Pie chart - Chart.js documentation
Polar area chart - Chart.js documentation
Radar chart - Chart.js documentation
Scatter chart - Chart.js documentation

Customizing the chart color

You can customize the color of the chart data by setting the $color property:

protected string $color = 'info';

If you’re looking to customize the color further, or use multiple colors across multiple datasets, you can still make use of Chart.js’s color options in the data:

protected function getData(): array
{
    return [
        'datasets' => [
            [
                'label' => 'Blog posts created',
                'data' => [0, 10, 5, 2, 21, 32, 45, 74, 65, 45, 77, 89],
                'backgroundColor' => '#36A2EB',
                'borderColor' => '#9BD0F5',
            ],
        ],
        'labels' => ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
    ];
}

Generating chart data from an Eloquent model

To generate chart data from an Eloquent model, Filament recommends that you install the flowframe/laravel-trend package. You can view the documentation.

Here is an example of generating chart data from a model using the laravel-trend package:

use Flowframe\Trend\Trend;
use Flowframe\Trend\TrendValue;

protected function getData(): array
{
    $data = Trend::model(BlogPost::class)
        ->between(
            start: now()->startOfYear(),
            end: now()->endOfYear(),
        )
        ->perMonth()
        ->count();

    return [
        'datasets' => [
            [
                'label' => 'Blog posts',
                'data' => $data->map(fn (TrendValue $value) => $value->aggregate),
            ],
        ],
        'labels' => $data->map(fn (TrendValue $value) => $value->date),
    ];
}

Filtering chart data

You can set up chart filters to change the data shown on chart. Commonly, this is used to change the time period that chart data is rendered for.

To set a default filter value, set the $filter property:

public ?string $filter = 'today';

Then, define the getFilters() method to return an array of values and labels for your filter:

protected function getFilters(): ?array
{
    return [
        'today' => 'Today',
        'week' => 'Last week',
        'month' => 'Last month',
        'year' => 'This year',
    ];
}

You can use the active filter value within your getData() method:

protected function getData(): array
{
    $activeFilter = $this->filter;

    // ...
}

Live updating chart data (polling)

By default, chart widgets refresh their data every 5 seconds.

To customize this, you may override the $pollingInterval property on the class to a new interval:

protected ?string $pollingInterval = '10s';

Alternatively, you may disable polling altogether:

protected ?string $pollingInterval = null;

Setting a maximum chart height

You may place a maximum height on the chart to ensure that it doesn’t get too big, using the $maxHeight property:

protected ?string $maxHeight = '300px';

Setting chart configuration options

You may specify an $options variable on the chart class to control the many configuration options that the Chart.js library provides. For instance, you could turn off the legend for a line chart:

protected ?array $options = [
    'plugins' => [
        'legend' => [
            'display' => false,
        ],
    ],
];

Alternatively, you can override the getOptions() method to return a dynamic array of options:

protected function getOptions(): array
{
    return [
        'plugins' => [
            'legend' => [
                'display' => false,
            ],
        ],
    ];
}

These PHP arrays will get transformed into JSON objects when the chart is rendered. If you want to return raw JavaScript from this method instead, you can return a RawJs object. This is useful if you want to use a JavaScript callback function, for example:

use Filament\Support\RawJs;

protected function getOptions(): RawJs
{
    return RawJs::make(<<<JS
        {
            scales: {
                y: {
                    ticks: {
                        callback: (value) => '€' + value,
                    },
                },
            },
        }
    JS);
}

Adding a description

You may add a description, below the heading of the chart, using the getDescription() method:

public function getDescription(): ?string
{
    return 'The number of blog posts published per month.';
}

Disabling lazy loading

By default, widgets are lazy-loaded. This means that they will only be loaded when they are visible on the page.

To disable this behavior, you may override the $isLazy property on the widget class:

protected static bool $isLazy = true;

Making the chart collapsible

You may allow the chart to be collapsible by setting the $isCollapsible property on the widget class to be true:

protected bool $isCollapsible = true;

Using custom Chart.js plugins

Chart.js offers a powerful plugin system that allows you to extend its functionality and create custom chart behaviors. This guide details how to use them in a chart widget.

Step 1: Install the plugin with NPM

To start with, install the plugin using NPM into your project. In this guide, we will install chartjs-plugin-datalabels:

npm install chartjs-plugin-datalabels --save-dev

Step 2: Create a JavaScript file importing the plugin

Create a new JavaScript file where you will define your custom plugin. In this guide, we’ll call it filament-chart-js-plugins.js. Import the plugin, and add it to the window.filamentChartJsPlugins array:

import ChartDataLabels from 'chartjs-plugin-datalabels'

window.filamentChartJsPlugins ??= []
window.filamentChartJsPlugins.push(ChartDataLabels)

It’s important to initialise the array if it has not been already, before pushing onto it. This ensures that mutliple JavaScript files (especially those from Filament plugins) that register Chart.js plugins do not overwrite each other, regardless of the order they are booted in.

You can push as many plugins to the filamentChartJsPlugins array as you would like to install, you do not need a separate file to import each plugin.

Step 3: Compile the JavaScript file with Vite

Now, you need to build the JavaScript file with Vite, or your bundler of choice. Include the file in your Vite configuration (usually vite.config.js). For example:

import { defineConfig } from 'vite';
import laravel from 'laravel-vite-plugin';

export default defineConfig({
    plugins: [
        laravel({
            input: [
                'resources/css/app.css',
                'resources/js/app.js',
                'resources/css/filament/admin/theme.css',
                'resources/js/filament-chart-js-plugins.js', // Include the new file in the `input` array so it is built
            ],
        }),
    ],
});

Build the file with npm run build.

Step 4: Register the JavaScript file in Filament

Filament needs to know to include this JavaScript file when rendering chart widgets. You can do this in the boot() method of a service provider like AppServiceProvider:

use Filament\Support\Assets\Js;
use Filament\Support\Facades\FilamentAsset;
use Illuminate\Support\Facades\Vite;

FilamentAsset::register([
    Js::make('chart-js-plugins', Vite::asset('resources/js/filament-chart-js-plugins.js'))->module(),
]);

You can find out more about asset registration, and even register assets for a specific panel.

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#Introduction

#Available chart types

#Customizing the chart color

#Generating chart data from an Eloquent model

#Filtering chart data

#Live updating chart data (polling)

#Setting a maximum chart height

#Setting chart configuration options

#Adding a description

#Disabling lazy loading

#Making the chart collapsible

#Using custom Chart.js plugins

#Step 1: Install the plugin with NPM

#Step 2: Create a JavaScript file importing the plugin

#Step 3: Compile the JavaScript file with Vite

#Step 4: Register the JavaScript file in Filament