我想构建一个允许用户选择文件然后使用此文件作为输入运行多个脚本的小管道。由于其中一些脚本运行了几分钟（具体时间取决于输入文件的大小），我想显示一个进度条，该进度条基于此管道的脚本数量已经完成。
问题是我不知道如何根据管道的状态更新此进度条，并希望得到一些帮助。我首先展示了我使用的文件，然后更详细地解释了这个问题。
我的HTML格式：
<form action="main.pl" method="post" enctype="multipart/form-data">
<input type="file" name="fileName" />
<input type="submit" value="Analyze" />
</form>
管道脚本main.pl：
#!/usr/bin/perl
use CGI;
use strict;
#use warnings;
my $q = CGI->new;
my $fileName = $q->param('fileName');
my $progressPerc = 0;
my $numJobs = 3; #in actual script much more
my $count = 1;
system('perl', './file1.pl', $fileName);
$progressPerc = $count/$numJobs*100;
#here I want to pass $progressPerc to the progress bar
$count += 1;
system('perl', './file2.pl', $fileName);
$progressPerc = $count/$numJobs*100;
#here I want to pass $progressPerc to the progress bar
$count += 1;
system('perl', './file3.pl', $fileName);
$progressPerc = $count/$numJobs*100;
#here I want to pass $progressPerc to the progress bar
我在http://jqueryui.com/progressbar/#label找到了一个好的工作进度条，如下所示（我发布了整个文件，虽然我只需要.js-part）：
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>http://jqueryui.com/progressbar/#label</title>
<link rel="stylesheet" href="http://code.jquery.com/ui/1.11.2/themes/smoothness/jquery-ui.css">
<script src="http://code.jquery.com/jquery-1.10.2.js"></script>
<script src="http://code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
<style>
.ui-progressbar {
position: relative;
}
.progress-label {
position: absolute;
left: 50%;
top: 4px;
font-weight: bold;
text-shadow: 1px 1px 0 #fff;
}
</style>
<script>
$(function() {
var progressbar = $( "#progressbar" ),
progressLabel = $( ".progress-label" );
progressbar.progressbar({
value: false,
change: function() {
progressLabel.text( progressbar.progressbar( "value" ) + "%" );
},
complete: function() {
progressLabel.text( "Complete!" );
}
});
function progress() {
var val = progressbar.progressbar( "value" ) || 0;
progressbar.progressbar( "value", val + 10 );
if ( val < 99 ) {
setTimeout( progress, 800 );
}
}
setTimeout( progress, 2000 );
});
</script>
</head>
<body>
<div id="progressbar"><div class="progress-label">Loading...</div></div>
</body>
</html>
每次更改其值时，有没有简单的方法将$ progressPerc从main.pl传递给函数progress（）？如果只有一个呼叫，这可以使用ajax完成，但是，我不知道如何使用ajax进行多次呼叫，即动态;通过＆＃39;动态＆＃39;我的意思是，一旦main.pl中的perl脚本完成，就应该向进度条报告，然后更新。
如果没有简单的方法：可以以某种方式引入一个if子句，检查每隔x分钟（使用setTimeout）是否存在由main.pl中的这些perl脚本生成的输出文件，如果是，则进度条更新，如果不是等待更长时间？如果是这样，它将如何实施？
答案 0 :(得分：3)
自从我提出这个问题以来差不多一个月了，但答案没有出现。因此，我现在发布一个基于ThisSuitIsBlackNot的评论。
虽然没有详细说明，但它可以作为如何连接Perl，HTML，Javascript / Ajax和JSON的最小示例。也许它可以帮助某人开始使用该主题。
如果要运行此代码，只需将index.html文件复制到html目录（例如/ var / www / html），将perl脚本复制到cgi-bin目录（例如/ var / www / cgi-bin ）。确保使这些perl脚本可执行！在我的下面的代码中，cgi目录位于/ var / www / cgi-bin / ajax / stackCGI中 - 请相应更改。
将管道的状态写入文件，然后以1秒的间隔读入，更新进度条并显示有关当前状态的消息。管道中单个步骤的持续时间由Perl的睡眠功能表示。
文件如下。
欢迎任何评论和改进！
的index.html：
<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<meta charset='utf-8' />
<link rel="stylesheet" href="http://code.jquery.com/ui/1.11.3/themes/smoothness/jquery-ui.css">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="http://code.jquery.com/ui/1.11.3/jquery-ui.js"></script>
<style>
.ui-progressbar {
position: relative;
}
.progress-label {
position: absolute;
left: 50%;
font-weight: bold;
text-shadow: 1px 1px 0 #fff;
}
</style>
<script>
var progressVal = 0;
function get_progress() //get_progress();
{
$.ajax({
type: 'POST',
url: '/cgi-bin/ajax/stackCGI/readFromFileJson.pl',
success: function( res ) {
$('#progressPerc').append(' ' + res.progressSummary.progress);
$('#progressMessage').html('status of pipeline: ' + res.progressSummary.progressMessage);
$('.progress-label').html(res.progressSummary.progress + '%');
progressVal = parseFloat(res.progressSummary.progress);
$( "#progressbar" ).progressbar({
value: progressVal
});
}
});
if (progressVal < 100){ //pipeline has not finished yet
setTimeout(get_progress, 1000); //call the function each second every second to get a status update
}
else { //pipeline has finished
$('.progress-label').html('100%');
alert("pipeline has finished! your results can be found in path/to/files. an e-mail has been sent to user@provider.com");
}
}
function start_pipeline()
{
$.ajax({
type: 'POST',
url: '/cgi-bin/ajax/stackCGI/pipeline.pl',
data: { 'fileAnalysis': $('#myFile').val() },
success: function(res) {
//add your success function here
},
error: function() {alert("pipeline has not started!");}
});
}
</script>
</head>
<body>
file name: <input type='text' id='myFile'/>
<button onclick='start_pipeline();get_progress();' >Analyze now</button>
<div id="progressbar"><div class="progress-label"></div></div>
<div id="progressMessage"></div>
<div id="progressPerc">status of pipeline in percent (in this example the function get_progress is called every second): </div>
</body>
pipeline.pl：
#!/usr/bin/perl
use strict;
use warnings;
use CGI;
my $q = new CGI;
print $q->header('text/plain'); #needed! otherwise the ajax call in start_pipeline returns the error message
my $fileForAnalysis = $q -> param('fileAnalysis');
#create a file where the progress is reported to
#make sure you have the appropriate permissions to do this
my $filename = '/var/www/cgi-bin/ajax/stackCGI/progressReport.txt'; #change the directory!
my $fh; #file handler
my $number; #progress of pipeline in percent
my $message; #progress of pipeline
$number = 0;
$message = 'pipeline has startet successfully! Your file '.$fileForAnalysis.' is now processed.';
open($fh, '>', $filename) or die "Could not open file '$filename' $!";
print $fh $number."\t".$message;
close $fh;
sleep(3); #first program is running
$number = 10; #progress of pipeline in percent. as we have 4 programs in this pipeline it could also be 25 or whatever
$message = 'first program has finished';
open($fh, '>', $filename) or die "Could not open file '$filename' $!";
print $fh $number."\t".$message;
close $fh;
sleep(5); #second program is running
$number = 20;
$message = 'second program has finished';
open($fh, '>', $filename) or die "Could not open file '$filename' $!";
print $fh $number."\t".$message;
close $fh;
sleep(5); #third program is running
$number = 42;
$message = 'third program has finished';
open($fh, '>', $filename) or die "Could not open file '$filename' $!";
print $fh $number."\t".$message;
close $fh;
sleep(5); #fourth program is running
$number = 100;
$message = 'pipeline has finished';
open($fh, '>', $filename) or die "Could not open file '$filename' $!";
print $fh $number."\t".$message;
close $fh;
readFromFileJson.pl：
#!/usr/bin/perl
use strict;
use warnings;
use JSON;
use CGI;
my $q = new CGI;
#create a file where the progress is reported to
#make sure you have the appropriate permissions to do this
my $filename = '/var/www/cgi-bin/ajax/stackCGI/progressReport.txt'; #change the directory!
open(my $fh, '<:encoding(UTF-8)', $filename) or die "Could not open file '$filename' $!";
print $q->header('application/json;charset=UTF-8'); #output will be returned in JSON format
my @progressReport = split(/\t/,<$fh>); #file is tab separated
my %progressHash;
$progressHash{"progress"} = $progressReport[0];
$progressHash{"progressMessage"} = $progressReport[1];
#convert hash to JSON format
my $op = JSON -> new -> utf8 -> pretty(1);
my $output = $op -> encode({
progressSummary => \%progressHash
});
print $output;