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The following tutorial column will introduce to you how to use Laravel snappy to generate PDF and integrate it into Laravel-admin. I hope it will be helpful to friends in need!

I have used python wkhtmltopdf to export PDF before, wkhtmltopdf is indeed very powerful The tool has many page customization options, and will automatically help you grab images from the Internet and render them into PDF. This time I wanted to implement the function of exporting PDF in Laravel-admin, so I found the extension package Laravel snappy, which is an encapsulation of the project https://github.com/KnpLabs/snappy. Coincidentally, it is also passed Call the wkhtmltopdf program to generate PDF.

// 安裝擴(kuò)展包
composer require barryvdh/laravel-snappy

// 將wkhtmltopdf作為composer依賴
// 對于64位系統(tǒng)，使用：
composer require h4cc/wkhtmltopdf-amd64 0.12.x
composer require h4cc/wkhtmltoimage-amd64 0.12.x

cp vendor/h4cc/wkhtmltoimage-amd64/bin/wkhtmltoimage-amd64 /usr/local/bin/
cp vendor/h4cc/wkhtmltopdf-amd64/bin/wkhtmltopdf-amd64 /usr/local/bin/

chmod +x /usr/local/bin/wkhtmltoimage-amd64 
chmod +x /usr/local/bin/wkhtmltopdf-amd64

In the

key set the facade alias (optional): <pre class='brush:php;toolbar:false;'>&amp;#39;PDF&amp;#39; =&gt; Barryvdh\Snappy\Facades\SnappyPdf::class, &amp;#39;SnappyImage&amp;#39; =&gt; Barryvdh\Snappy\Facades\SnappyImage::class,</pre>Finally publish the resource file: <pre class='brush:php;toolbar:false;'>php artisan vendor:publish --provider=&quot;Barryvdh\Snappy\ServiceProvider&quot;</pre> in

Add in the file:

WKHTML_PDF_BINARY=/usr/local/bin/wkhtmltopdf-amd64
WKHTML_IMG_BINARY=/usr/local/bin/wkhtmltoimage-amd64

Then make the following configuration in the snappy.php configuration file:

    'pdf' => [
        'enabled' => true,
        'binary'  => env('WKHTML_PDF_BINARY', 'vendor/h4cc/wkhtmltopdf-amd64/bin/wkhtmltopdf-amd64'),
        'timeout' => 3600,
        'options' => [],
        'env'     => [],
    ],

    'image' => [
        'enabled' => true,
        'binary'  => env('WKHTML_IMG_BINARY', 'vendor/h4cc/wkhtmltoimage-amd64/bin/wkhtmltoimage-amd64'),
        'timeout' => 3600,
        'options' => [],
        'env'     => [],
    ],

Use

Generate PDF by loading the rendering blade template:

$pdf = PDF::loadView('pdf.invoice', $data); //pdf.invoice是你的blade模板
return $pdf->download('invoice.pdf');

return PDF::loadFile('http://www.github.com')->inline('github.pdf');

Generate through html, make various settings, and save it:

PDF::loadHTML($html)->setPaper('a4')->setOrientation('landscape')->setOption('margin-bottom', 0)->save('myfile.pdf')
// 更多選項(xiàng)可查看wkhtmltopdf的手冊：https://wkhtmltopdf.org/usage/wkhtmltopdf.txt

The default export format of Laravel-admin is csv, here we will transform it into the desired PDF format.

Look at the export button, you can get the format of the three export entries as follows:

http://hostname/posts?_export_=all  // 導(dǎo)出全部
http://hostname/posts?_export_=page%3A1 // 導(dǎo)出當(dāng)前頁
http://hostname/posts?_export_=selected%3A1 // 導(dǎo)出選定的行

. From here, you can find it in

：<pre class='brush:php;toolbar:false;'>public function render(){ $this-&gt;handleExportRequest(true); try { $this-&gt;build(); } catch (\Exception $e) { return Handler::renderException($e); } $this-&gt;callRenderingCallback(); return view($this-&gt;view, $this-&gt;variables())-&gt;render();}</pre>If there is _export=... parameter in the url, $this->handleExportRequest(true);The code inside will be executed:

protected function handleExportRequest($forceExport = false){
    if (!$scope = request(Exporter::$queryName)) {
        return;
    }

    // clear output buffer.
    if (ob_get_length()) {
        ob_end_clean();
    }

    $this->disablePagination();

    if ($forceExport) {
        $this->getExporter($scope)->export();  // 這里將調(diào)用某個(gè)類的export方法
    }}

The most important thing is the export method. We will create a new class that inherits the

class to implement the export logic we want. In addition, look at the getExporter method: <pre class='brush:php;toolbar:false;'>protected function getExporter($scope){ return (new Exporter($this))-&gt;resolve($this-&gt;exporter)-&gt;withScope($scope);}</pre>We can also rewrite withScope in the subclass to perform some parameter settings and interception.

After understanding the basic principles and referring to the Laravel-admin documentation, we can start changing the export Functional. First, create an extension, such as

, the code is implemented as follows:

<?php

namespace App\Admin\Extensions;

use Encore\Admin\Grid\Exporters\AbstractExporter;
use Encore\Admin\Grid\Exporter;
use PDF;

class PdfExporter extends AbstractExporter
{
    protected $lackOfUserId = false;

    public function withScope($scope){
        // 你自己的一些處理邏輯，比如：
        /*if ($scope == Exporter::SCOPE_ALL) {
            if(request()->has(&#39;user_id&#39;)) {
                $this->grid->model()->where(&#39;user_id&#39;, request()->user_id);
            } else {
                $this->lackOfUserId = true;
            }
            return $this;
        }*/
        return parent::withScope($scope);
    }

    public function export()
    {
        // 具體的導(dǎo)出邏輯，比如：
        if($this->lackOfUserId) {
            $headers = [
                &#39;Content-Encoding&#39;    => &#39;UTF-8&#39;,
                &#39;Content-Type&#39;        => &#39;text/html;charset=UTF-8&#39;,
            ];
            response(&#39;請先篩選出用戶&#39;, 200, $headers)->send();
            exit();
        }
        $author = $this->grid->model()->getOriginalModel()->first()->user->user_name;

        $this->grid->model()->orderBy(&#39;add_time&#39;, &#39;desc&#39;);

        // 按年-月分組數(shù)據(jù)
        $data = collect($this->getData())->groupBy(function ($post) {
            return Carbon::parse(date(&#39;Y-m-d&#39;,$post[&#39;add_time&#39;]))->format(&#39;Y-m&#39;);
        })->toArray();
        // 渲染數(shù)據(jù)到blade模板
        $output = PDF::loadView(&#39;pdf.weibo&#39;, compact(&#39;data&#39;))->setOption(&#39;footer-center&#39;, &#39;[page]&#39;)->output();

        $headers = [
            &#39;Content-Type&#39;        => &#39;application/pdf&#39;,
            &#39;Content-Disposition&#39; => "attachment; filename=$author.pdf",
        ];

        // 導(dǎo)出文件，
        response(rtrim($output, "\n"), 200, $headers)->send();

        exit;
    }
}

Then, in app/Admin/ Register the extension in bootstrap.php:

Exporter::extend('pdf-exporter', PdfExporter::class);

Finally, use it in the Grid method:

protected function grid(){
    // 其他邏輯...

    // 添加導(dǎo)出PDF的擴(kuò)展
    $grid->exporter('pdf-exporter');
    return $grid;}

In this way, when you click the export button, you can Download PDF now.

The css and js addresses in the blade template must be the complete url address, so mix( 'css/app.css')

asset('css/app.css')
• It is best to use the http protocol instead of https for the image address, which is less error-prone
Finally, post a rendering:

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