jquery - 在 WordPress 中使用 ajax 下载文件

Question

是否可以使用WordPress Ajax下载文件。我有这个功能来下载附件。

function download_attachment()
{
    $file_path = $_POST['filename'];
    $file_mime = $_POST['mime'];
    $data['file_path'] = file_exists($file_path);

    try{
        header('Pragma: public');   // required
        header('Expires: 0');       // no cache
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Last-Modified: '.gmdate ('D, d M Y H:i:s', filemtime ($file_path)).' GMT');
        header('Cache-Control: private',false);
        header('Content-Type: '.$file_mime);
        header('Content-Disposition: attachment; filename="'.basename($file_path).'"');
        header('Content-Transfer-Encoding: binary');
        header('Content-Length: '.filesize($file_path));    // provide file size
        header('Connection: close');
        set_time_limit(0);
        @readfile("$file_path") or die("File not found.");

    }catch(Exception $e)
    {
        $data['error'] = $e->getMessage() ." @ ". $e->getFile() .' - '. $e->getLine();
    }
    }
    echo json_encode($data);
    die();
}

它通过以下函数连接到 WordPress 主函数​​:

    add_action('wp_ajax_download_attachment','download_attachment');

jQuery 代码是这样的:

var data = {
        'function': 'download_attachment',
        'filename': file_path,
        'mime': mime
    };

    jQuery.ajax({
        url: ajaxurl,
        type: "POST",
        data: data,
        success: function(return_data, textStatus, jqXHR) {
            parsedData = kalimahJS.parseJSON(return_data);
            window.open(parsedData.url);
        }
    })

屏幕上显示的最终结果是0。还有其他方法可以做到这一点吗？

Answer 1

由于没有人回答过这个问题，特别是针对 WordPress，我想我会分享我的答案:

比如说，我想提供一个日志文件，以便于我的插件的用户下载(这就是我现在正在做的事情)。我要做的如下:

注册 AJAX 操作

add_action('wp_ajax_daan_download_log', 'daan_download_log');

创建函数

function daan_download_log()
{
    check_ajax_referer('daan-nonce-value, 'nonce');

    if (!current_user_can('manage_options')) {
        wp_die(__("Hmmm, you're not supposed to be here.", 'my-plugin-name));
    }

    $filename = '/path/to/filename.log';

    if (!file_exists($filename)) {
        wp_die();
    }

    $basename = basename($filename);
    $filesize = filesize($filename);

    header('Content-Description: File Transfer');
    header('Content-Type: text/plain');
    header("Cache-Control: no-cache, must-revalidate");
    header("Expires: 0");
    header("Content-Disposition: attachment; filename=$basename");
    header("Content-Length: $filesize");
    header('Pragma: public');

    flush();

    readfile($filename);

    wp_die();
}

指向 AJAX 操作的链接

您可以在任何需要下载文件的地方添加此内容。

<?php $nonce = wp_create_nonce('daan-nonce-value'); ?>

<a href='<?php echo admin_url("admin-ajax.php?action=daan_download_log&nonce=$nonce"); ?>' class="button button-primary">Download Log File</a>