Count Table Column Values

table-column-count.js

function tableColumnTotal(tableClassName,columnClassName){
	var columnIndexes = [];
	var columnTotals = [];
	
	//grab all tables
	var tablesToInspect = document.getElementsByClassName(tableClassName);
	
	//if tables found
	if (tablesToInspect.length > 0){
		//loop thru tables
		for (var xIndex=0;xIndex<tablesToInspect.length;xIndex++){
			//grab TR/rows
			var thisTablesRows = tablesToInspect[xIndex].getElementsByTagName('tr');
			//loop thru TR/rows
			if (thisTablesRows.length > 0) for (var yIndex=0;yIndex<thisTablesRows.length;yIndex++){
				//grab all td/Columns
				var thisRowsColumns = thisTablesRows[yIndex].getElementsByTagName('td');
				//loop thru columns/td
				if (thisRowsColumns.length > 0) for (var zIndex=0;zIndex<thisRowsColumns.length;zIndex++){
					//grab Column
					var thisColumn = thisRowsColumns[zIndex];
					//look for classname
					if (thisColumn.className.indexOf(columnClassName)>-1) {
						//set column index to countable
						columnIndexes[zIndex] = true;
						columnTotals[zIndex] = 0;
					}else if(columnIndexes[zIndex]){
						//add value to Totals
						columnTotals[zIndex] += parseInt(thisColumn.innerText);
					}else{
						//nothing
					}
				}
			}
			
			//create a new Table row with totals
			var newTableRow = document.createElement('tr');
			newTableRow.className ="tablehdr";
			
			//loop thru columns
			if (thisRowsColumns.length > 0) for(var vIndex=0;vIndex<thisRowsColumns.length;vIndex++){
				var newColumn = document.createElement('td');
				newColumn.innerHTML = (vIndex in columnIndexes) ? columnTotals[vIndex] : "&nbsp;";
				newColumn.align = "center";
				newTableRow.appendChild(newColumn);
			}
			//attach totals row to Table
			tablesToInspect[xIndex].appendChild(newTableRow);
		}
	}	
}