Google Spreadsheet Count of colored cells in a range in Custom Function

Count of colored cells in a range in Custom Function

I have the following formula in cell E9:
=countColoredCells(A1:C6,E1)

and the following formula in cell F9:
=countColoredCells(A1:C6,F1)

countColoredCells is a custom function created with the help of the following script code, in this function you need to pass the range in first parameter in which you want to count the colored cells, and also you need to pass the cell in the second parameter which have the background that you need to count in the range (provided in first parameter).

Put the following script code in the script editor of your spreadsheet:

/////////////////////////////////////////////////

/**
* @param {range} countRange Range to be evaluated
* @param {range} colorRef Cell with background color to be searched for in countRange
* @return {number}
* @customfunction
*/

function countColoredCells(countRange,colorRef) {
  var activeRange = SpreadsheetApp.getActiveRange();
  var activeSheet = activeRange.getSheet();
  var formula = activeRange.getFormula();
  
  var rangeA1Notation = formula.match(/\((.*)\,/).pop();
  var range = activeSheet.getRange(rangeA1Notation);
  var bg = range.getBackgrounds();
  var values = range.getValues();
  
  var colorCellA1Notation = formula.match(/\,(.*)\)/).pop();
  var colorCell = activeSheet.getRange(colorCellA1Notation);
  var color = colorCell.getBackground();
  
  var count = 0;
  
  for(var i=0;i<bg.length;i++)
    for(var j=0;j<bg[0].length;j++)
      if( bg[i][j] == color )
        count=count+1;
  return count;
};

/////////////////////////////////////////////////

NOTE:

When you change the color of any cell the value will not get auto updated in the result,

so you need to temporary change the value of any of one of the cell in the range (and then change it back as you want..)

this will update the color counting result...

For getting sum instead of count of cells having a background color, look at the following link:
http://igoogledrive.blogspot.com/2015/11/google-spreadsheet-sum-of-colored-cells.html