How can one easily retrieve the callback function arguments from outside the function?

Here is a snippet of my code:

var jenkins = require('jenkins')('http://192.168.1.5:8080');
var job_name = undefined;

jenkins.job.list(function doneGetting(err, list) {
    if (err) throw err;
    job_name = list[0].name;
});

jenkins.job.get(job_name, function(err, info){
    if (err) throw err;
    res.render('index', {
         title: 'Jenkins API',
         job_name: job_name,
         job_info: info
    })
});

I am facing an issue where I can't access the value of job_name because it's within the callback function. I've been searching for a solution to this problem but haven't found one yet. I apologize for any redundancy in asking about callbacks.

Thank you for any help in advance.

Answer №1

If you want to streamline your code, consider moving the jenkins.job.get inside the jenkins.job.list callback function.

jenkins.job.list(function doneGetting(err, list) {
    if (err) throw err;
    job_name = list[0].name;

    jenkins.job.get(job_name, function(err, info){
        if (err) throw err;
        res.render('index', {
             title: 'Jenkins API',
             job_name: job_name,
             job_info: info
        })
    });
});

Alternatively, you can use a separate function for fetching the job information:

jenkins.job.list(function doneGetting(err, list) {
    if (err) throw err;
    job_name = list[0].name;

    getJob(job_name);
});

function getJob(job_name) {
    jenkins.job.get(job_name, function(err, info){
        if (err) throw err;
        res.render('index', {
             title: 'Jenkins API',
             job_name: job_name,
             job_info: info
        })
    });
}

The best approach depends on your specific coding pattern, module structure, or script complexity.

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