我想在下载Excel文件时显示进度条。 这是我从表中以Excel格式下载数据的代码。但是当我下载Excel时,我还没有想到如何使用进度条。
任何人都可以帮我怎么做?
这是我的代码:
<?php
if(isset($_POST['submit']))
{
/*******EDIT LINES 3-8*******/
$DB_Server = "localhost"; //MySQL Server
$DB_Username = "root"; //MySQL Username
$DB_Password = ""; //MySQL Password
$DB_DBName = "project"; //MySQL Database Name
$DB_TBLName = "users123"; //MySQL Table Name
$filename = "usersdata"; //File Name
/*******YOU DO NOT NEED TO EDIT ANYTHING BELOW THIS LINE*******/
//create MySQL connection
$sql = "Select * from $DB_TBLName";
$Connect = @mysql_connect($DB_Server, $DB_Username, $DB_Password) or die("Couldn't connect to MySQL:<br>" . mysql_error() . "<br>" . mysql_errno());
//select database
$Db = @mysql_select_db($DB_DBName, $Connect) or die("Couldn't select database:<br>" . mysql_error(). "<br>" . mysql_errno());
//execute query
$result = @mysql_query($sql,$Connect) or die("Couldn't execute query:<br>" . mysql_error(). "<br>" . mysql_errno());
$file_ending = "xls";
//header info for browser
header("Content-Type: application/xls");
header("Content-Disposition: attachment; filename=$filename.xls");
header("Pragma: no-cache");
header("Expires: 0");
/*******Start of Formatting for Excel*******/
//define separator (defines columns in excel & tabs in word)
$sep = "\t"; //tabbed character
//start of printing column names as names of MySQL fields
for ($i = 0; $i < mysql_num_fields($result); $i++) {
echo mysql_field_name($result,$i) . "\t";
}
print("\n");
//end of printing column names
//start while loop to get data
while($row = mysql_fetch_row($result))
{
$schema_insert = "";
for($j=0; $j<mysql_num_fields($result);$j++)
{
if(!isset($row[$j]))
$schema_insert .= "NULL".$sep;
elseif ($row[$j] != "")
$schema_insert .= "$row[$j]".$sep;
else
$schema_insert .= "".$sep;
}
$schema_insert = str_replace($sep."$", "", $schema_insert);
$schema_insert = preg_replace("/\r\n|\n\r|\n|\r/", " ", $schema_insert);
$schema_insert .= "\t";
print(trim($schema_insert));
print "\n";
}
}
?>
<form method="post" action="">
<button type="submit" name="submit" class="btn btn-default">Download Excel</button>
</form>
请有人帮助我如何显示进度条。
答案 0 :(得分:0)
你无法直接在PHP中解决这个问题,因为PHP是完全处理的,然后发送到浏览器。您需要结合使用Javascript(可能是ajax请求)和PHP来实现您想要做的事情。
这里有一个很好的例子:How would you create a progress bar with AJAX/jQuery for downloading XML content?