同时下载多个PDF文件

Question

我需要通过选择文本框和点击下载按钮同时下载PDF文件。现在，我可以单击每个项目旁边的“下载”按钮来下载该项目。我需要另一个按钮，将用于批量下载的文件。

下面是每个项目旁边的下载按钮的代码。

<td><a href="print_voucher.php?em_id=<?php echo $row['voucher_id'] ?>" download="print_voucher.php?em_id=<?php echo $row['voucher_id'] ?>"> Download </a></td>

下面是显示要下载的项目的整个表的代码。

<form action="createzip.php" method="post">
    <table id="selection_table" class="data-table table stripe hover nowrap">
        <thead>
            <tr>
                <div class="col-md-6">
                </div>
                <div class="col-md-1">
                </div>
                <div class="col-md-2">
                </div>
                <div class="col-md-3 pd-10 text-center">
                    <a class="btn btn-primary" name="createzip" id="createzip" value="createzip"> DOWNLOAD ALL </a>
                </div>
            </tr>
            <tr>
                <th class="table-plus datatable-nosort"> <input id="select_all" style="max-height: 20px; max-width: 20px;" type="checkbox" class="form-control" value="Select All"/> <p> Select All </p></th>
                <th> COMPANY NAME </th>
                <th> EMPLOYEE NAME </th>
                <th> DOWNLOAD LINK </th>
            </tr>
        </thead>
        <tbody>
            <tr>

                <?php
                
                    $sql = "SELECT * FROM vouchers WHERE voucher_id BETWEEN '$empID' AND '$endEmpID'";
                    $query = mysqli_query($conn, $sql) or die(mysqli_error());
                    while ($row = mysqli_fetch_array($query)) {
                    $id = $row['voucher_id'];
                 ?>  

                <td class="table-plus">
                    <input style="max-height: 20px; max-width: 20px;" name="fieldid[]" id="checkbox<?php echo $row['voucher_id'] ?>" value="<?php $row['voucher_id'] ?>" type="checkbox" class="form-control">
                </td>
                <td><?php echo $row['paid_by']; ?></td>
                <td><?php echo $row['paid_by']; ?></td>
                <td><a href="print_voucher.php?em_id=<?php echo $row['voucher_id'] ?>" download="print_voucher.php?em_id=<?php echo $row['voucher_id'] ?>"> Download </a></td>

            </tr>
            <?php }?>
        </tbody>
    </table>
</form>

如何同时下载文件？

Answer 1

当单击按钮时，您可以使用jquery/js进行操作。首先，需要将下载按钮添加到html标记中。

<button class='download'> Download files </button>

之后，将以下代码添加到文件末尾的脚本标记中：

$('.download_button').click(function(e) {
    e.preventDefault();

    $('.table-plus input:checked').each(function (e){
        window.open('http://yoursite.com/print_voucher.php?em_id='+this.value);
    });
});

此外，如果您想下载任何文件(也是PDF )，您将需要更改下载文件的服务器头(这是服务器端- PHP读取示例)：

<?php
header("Content-type:application/pdf");

// It will be called downloaded.pdf
header("Content-Disposition:attachment;filename='myFile.pdf'");

readfile("myFile.pdf");