option for evaluating calendar weeks

[das399igste]

Hello,
I've been using the great node-red-contrib-dashboard-bar-chart-data node for some time now.
But somehow I was missing the analysis by calendar week.

So I tried to incorporate this feature and created a fork for it.

In the end it was pretty easy. I needed a function that would calculate the calendar week for me. I found a very good one at https://weeknumber.com/how-to/javascript#.

// Returns the ISO week of the date.
Date.prototype.getWeek = function() {
  var date = new Date(this.getTime());
  date.setHours(0, 0, 0, 0);
  // Thursday in current week decides the year.
  date.setDate(date.getDate() + 3 - (date.getDay() + 6) % 7);
  // January 4 is always in week 1.
  var week1 = new Date(date.getFullYear(), 0, 4);
  // Adjust to Thursday in week 1 and count number of weeks from date to week1.
  return 1 + Math.round(((date.getTime() - week1.getTime()) / 86400000
                        - 3 + (week1.getDay() + 6) % 7) / 7);
}

I added this to the beginning of the bar-chart-data.js file.
Then I only had to adjust three functions in the bar-chart-data.js file:

function buildDateKey(date):

else if (myNode.x_interval == "weeks") {
return fullKey.slice(0, -10) + date.getWeek();
}

function buildLabels(date):

else if (myNode.x_interval == "weeks") {
label = "" + date.getFullYear() + "-" + ("0" + date.getWeek()).slice(-2);
}

function dateMinus(date_in, minus=1):

else if (myNode.x_interval == "weeks") {
date.setDate(date.getDate()-(minus*7));
}

And then the line in the bar-chart-data.html file
<option value='weeks'>weeks</option>
insert.

If you find the evaluation after weeks useful, I would be happy if you could incorporate it into your release.

Best regards
Harald (das399igste)