Error message when saving JS code (updated)

Thanks @TomG, Here is the code. I skipped the part linking to jQuery, which does not seem to be the problem.

```
Qualtrics.SurveyEngine.addOnload(function()
{
var player0;
class Player {
constructor(player_dom, on_finish_func) {
this.playing = false;
this.finished = false;
this.savevolume = 1;
this.on_finish_func = on_finish_func;

this.player = $(player_dom);
this.sound_name= this.player.attr("soundfile");
this.playbutton = $('.player_playbutton', this.player);
this.allow_replay = this.player.attr("allowreplay") != undefined;
this.song = new Audio(this.sound_name);
var pp = this;

this.song.oncanplaythrough = function(){
var limit = pp.secToMin(pp.song.duration);
$(".player_total", pp.player).text(limit.minutes + ":" + pp.pad(limit.seconds,2));
$('.player_seek', pp.player).attr('max', pp.song.duration);
}

this.song.onended = function(){
pp.finished = true;
pp.on_finish_func();
if (pp.allow_replay){
// Allow a reset to the beginning, setting the play button and position
pp.finished = false;
pp.song.currentTime = 0;
$(".player_current", pp.player).text(0);
pp.playing = false;
pp.playbutton.addClass("player_play")
pp.playbutton.removeClass("player_pause")
}
}

$(".player_volume", pp.player).val(1.0);

if (this.song.canPlayType('audio/mpeg;')) {
this.song.type= 'audio/mpeg';
this.song.src= this.sound_name;
}

/*if (this.allow_replay) {
$(".player_seek", pp.player).bind("change", function(value) {
pp.song.currentTime = $(this).val();
});
}*/

this.playbutton.on('click', function(e) {
e.preventDefault();
if (!pp.finished){
if (pp.playing) {
pp.song.pause();
pp.playing = false;
pp.playbutton.addClass("player_play")
pp.playbutton.removeClass("player_pause")
} else {
pp.song.play();
pp.playing = true;
pp.playbutton.addClass("player_pause")
pp.playbutton.removeClass("player_play")
}
$('.player_seek', pp.player).attr('max',pp.song.duration);
}
});

$(".player_volume", pp.player).bind("change", function() {
pp.song.volume = $(this).val();
pp.savevolume = pp.song.volume;
});

this.song.addEventListener('timeupdate',function (){
var curtime = parseFloat(pp.song.currentTime);
/*curtime = song.currentTime;*/
$(".player_seek", pp.player).attr("value", curtime);
$(".player_seek", pp.player).val(curtime);

var time = pp.secToMin(curtime);
$(".player_current", pp.player).text(time.minutes + ":" + pp.pad(time.seconds, 2));
});
}

pad(num, size) {
var s = num+"";
while (s.length < size) s = "0" + s;
return s;
}

secToMin(secs){
var minutes = Math.floor(secs / 60);
var seconds = Math.floor(secs) % 60;
return {"minutes" : minutes, "seconds" : seconds}
}
}

player0 = new Player("#player01", this.enableNextButton);

});

Qualtrics.SurveyEngine.addOnload(function() {
this.disableNextButton();
});
```

> @yangye0312 said:
> Quick update @TomG. I found out that the following code gave me the exact problem:
>
> ```
> Qualtrics.SurveyEngine.addOnload(function()
> {
> class Player {
> });
> ```
> Changing the class name to anything else and the issue remains. It seems like the reserved word is "class". This seems like a bug to me.
>
> Do other people experience the same problem?

It has nothing to do with the word "class." You have an unclosed bracket ({). It should be:
```
Qualtrics.SurveyEngine.addOnload(function()
{
class Player {}
});
```

Recently I've encountered the following error message when saving a previously working JS:
"Invalid JavaScript! You cannot save until you fix all errors: Unexpected reserved word"

The script still functions (!!) but, due to this error message, could not be edited.

Thanks to help from the community, I've nailed the problem down to this following code (see the screenshot):
```
Qualtrics.SurveyEngine.addOnload(function() { class Player {} });
```

It seems like the keyword "class" is causing this issue. Suspecting that this could be an isolated case, I asked a colleague to try this with his account, and he had the same issue. But we use the same organizational accounts. Can good people here try this and see if the same problem occurs or not? This will be very helpful.
!

@Christoph,

It works with most code, but I've noticed a few situations where it doesn't. It kind of depends on the code. One thing I've noticed is sometimes it doesn't like single quotes in code, so replacing them with double quotes will fix it and allow you to post the code.

Anyone has the same problem? Anyone?