How to use Laravel snappy to generate PDF and integrate into Laravel-admin

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.

// 安装扩展包
composer require barryvdh/laravel-snappy

// 将wkhtmltopdf作为composer依赖
// 对于64位系统，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')
// 更多选项可查看wkhtmltopdf的手册：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  // 导出全部
http://hostname/posts?_export_=page%3A1 // 导出当前页
http://hostname/posts?_export_=selected%3A1 // 导出选定的行

. 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();  // 这里将调用某个类的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($scope){
        // 你自己的一些处理逻辑，比如：
        /*if ($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()
    {
        // 具体的导出逻辑，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;请先筛选出用户&#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-月分组数据
        $data = collect($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();
        // 渲染数据到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",
        ];

        // 导出文件，
        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(){
    // 其他逻辑...

    // 添加导出PDF的扩展
    $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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