Add a method to get the current value of progress bar

[danula]

While it is possible to manually set the value to progress bar. If you need to increment the value, you need to do the following.

var progress_bar_width = $('#jspsych-progressbar-inner')[0].style.width.slice(0,-1);
jsPsych.setProgressBar(progress_bar_width*0.01+0.02);

It would be convenient for users if there is a method that returns the current value of progress bar.

[jodeleeuw]

Agreed.

If you haven't manually altered the progress bar you can get the current value like this:

jsPsych.progress().percent_complete