jQuery和perl:基于状态的进度条;管道文件”;,动态ajax

jQuery and perl: progress bar based on state of "pipeline file", dynamic ajax

本文关键字:管道文件 ajax 动态 perl 于状态 状态 jQuery      更新时间:2023-10-02

我想构建一个小管道,允许用户选择一个文件,然后使用该文件作为输入运行几个脚本。由于其中一些脚本运行了几分钟(确切的时间取决于输入文件的大小),我想显示一个进度条,该进度条基于该管道中已完成的脚本数量。

问题是,我不知道如何根据管道的状态更新这个进度条,如果能提供一些帮助,我将不胜感激。我先展示我使用的文件,然后更详细地解释问题。

我的html表单:

<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

我在上找到了一个良好的工作进度条http://jqueryui.com/progressbar/#label它看起来如下(我发布了整个文件,尽管我只需要.js部分):

<!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>

有没有什么简单的方法可以在函数progress()每次更改值时将$progressPerc从main.pl传递给它?如果只有一个调用,可以使用ajax来完成,但是,我不知道如何将ajax用于多个调用,即动态调用;所谓"动态",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,然后更新进度条。

如果没有简单的方法可以做到这一点:是否可以引入一个If子句,每隔x分钟(使用setTimeout)检查main.pl中这些perl脚本生成的输出文件是否存在,如果存在,则更新进度条,如果不存在,则等待更长的时间?如果是,将如何实施?

我问这个问题已经快一个月了,但没有得到答案。因此,我现在发布我的一个基于ThisSuitIsBlackNot的评论。

虽然没有详细说明,但它可能是一个关于如何连接Perl、HTML、Javascript/Ajax和JSON的最小示例。也许这有助于人们开始谈论这个话题。

如果您想运行此代码,只需将index.html文件复制到html目录(例如/var/www/html),并将perl脚本复制到cgi-bin目录(例如/var/www/cgi-bin)。确保这些perl脚本可执行!在我下面的代码中,cgi目录位于/var/www/cgi-bin/ajax/stackCGI中,请相应地更改。

管道的状态被写入一个文件,然后每隔1秒读取一次,进度条被更新,并显示一条关于当前状态的消息。管道中的单个步骤所花费的持续时间由Perl的睡眠函数表示。

文件如下所示。

欢迎任何意见和改进!

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;