estimate Row Height of a Google Sheet when rendered to PDF - html

Question

.getRowHeight() method gives only the default height 21. I want to get the row height and set it to forced. What is the need? 1. I want to add page breaks after desired row, 2. want to add cumulative sub-totals on each page 3. want to restart page numbers, 4. want to write page numbers like : 'Page 1 of 9', 5. want to download the PDF directly (without saving to drive). I have gone through almost all the threads, but I can't find anything for estimation of the row height, if I have missed any, then let me know.
Observations: Different font families occupies different space, different languages fonts occupies different space. When the range of a Google sheet is printed as PDF, it renders the texts differently then the sheet.
I tried to estimate the row height but it is not accurate. I think my approach is not good. To get accurate result, one should follow the same approach, which is used by Google. (I think, they should have used the scroll Height of HTML element text area.)
The whole code is in this Google SpreadSheet. Run the function from custom Menu 'Row Heights' > estimateRowHeightsPDF, It will fetch the data from 'DataSheet', will calculate rowHeights and it will paste the data in 'PrintSheet', with extra columns showing the cellHeight of every cell and noOfLines of every cell. First 11 rows data is protected in DataSheet but you can add your data in the rows 12 onwards. Please keep these functions as they are. Add another .gs or .html files in Apps Script and other sheets if needed. Thank you in advance.
// count number of lines of a cell content depending on colWidths and font size
// This is only for the default font (Arial)
// should modify for other font families and font weight, fonts of different languages too
// Here I have only Gujarati or English Fonts
function countNoOfLinesForDefaultArial(str, colWidth, fontSize){
if(isValidDate(str)){
//format like str = "28/12/2022";
str = Utilities.formatDate(str, timeZone, "dd/MM/yyyy");
}else if(typeof str === "number"){
// to keep preceeding zeros
str = "'" + str.toString();
}else{
str = str.toString();
}
var lines = str.split(/\r\n|\r|\n/);
var noOflines = 0;
// found by trial and error
if(includesGujaratiFont(str)){
var multiplier = colWidth <= 100 ? 8 : colWidth <= 300 ? 7.9 : colWidth <= 400? 8.5 : colWidth <= 500? 8.2 : 7.5;
}else{
var multiplier = colWidth <= 100 ? 7: colWidth <= 300 ? 6.5 : colWidth <= 400? 6.35 : colWidth <= 500? 6.25 : 6.20;
}
multiplier = Math.ceil(multiplier*fontSize/10);
lines.forEach(line => {
// If there is \n\n then split will give a blank string
// of length 0 but we should add 1 line height for that
noOflines += line.length === 0? 1 : Math.ceil(line.length * multiplier / colWidth) ;
})
return noOflines;
}
Then the noOfLines is multiplied with the height to get the cell Height
// it gives estimated cell height
function getRowHeightManuallyFromStrForDefaultArialByIdentifyingFonts(str, colWidth, fontSize){
if(isValidDate(str)){
//format like str = "28/12/2022";
str = Utilities.formatDate(str, timeZone, "dd/MM/yyyy");
}else if(typeof str === "number"){
// to keep preceeding zeros
str = "'" + str.toString();
}else{
str = str.toString();
}
var count = countNoOfLinesForDefaultArial(str, colWidth, fontSize);
// by trial and error
if(includesGujaratiFont(str)){
var calculatedHeight = count == 1? 24: count < 6? (4*24 + (count-4)*23): count < 9? (5*24 + (count-5)*23):count < 10? (4*24 + (count-4)*23): count < 12? (7*24 + (count-7)*23): count < 17? (5*25 + (count-5)*24): (8*24 + (count-8)*23);
}else{
var calculatedHeight = count == 1? 21: count < 4? (1*21 + (count-1)*20): count < 6? (2*20 + (count-2)*19): count < 9? (3*20 + (count-3)*19):count < 10? (4*20 + (count-4)*19): count < 12? count*19: (5*19 + (count-5)*18);
}
calculatedHeight = Math.ceil(calculatedHeight*fontSize/10);
return calculatedHeight;
}
Then I am using these functions in the following function
function estimateRowHeightsPDF() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var dataSheet = ss.getSheetByName("DataSheet");
var range = dataSheet.getRange("A2:D"+dataSheet.getLastRow());
var vals = range.getValues();
var fontSizes = range.getFontSizes();
var printSheet = ss.getSheetByName("PrintSheet");
var colWidths = getColWidthsFromTo(dataSheet, "A", "D");
colWidths.forEach((col, i) => {
printSheet.setColumnWidths(i+1,1,col);
});
var estimatedRowHeights = [];
var noOfLinesLineLengthsHeights = [];
vals.forEach((row, i) => {
var rowHeight = 0;
row.forEach((cell, j) => {
var noOfLines = countNoOfLinesForDefaultArial(cell, colWidths[j], fontSizes[i][j]);
var heightOfCell = getRowHeightManuallyFromStrForDefaultArialByIdentifyingFonts(cell, colWidths[j], fontSizes[i][j]);
var lineLengths = lineLengthForEachLine(cell, colWidths[j], fontSizes[i][j]);
if(heightOfCell > rowHeight) { rowHeight = heightOfCell};
noOfLinesLineLengthsHeights.push([ [noOfLines, lineLengths, heightOfCell].join(" : ") ]);
vals[i].push([noOfLines, lineLengths, fontSizes[i][j], heightOfCell].join(" : "));
});
estimatedRowHeights.push(rowHeight);
});
estimatedRowHeights.forEach((height, i) => {
// forced height to set
// header row to keep as it is
printSheet.setRowHeightsForced(i+2,1,height);
});
printSheet.getRange(2,1,vals.length, vals[0].length).setValues(vals).setWrap(true).setBorder(true,true,true,true,true,true).setVerticalAlignment("top");
printSheet.getRange(2,1,vals.length, 4).setFontSizes(fontSizes);
var fileName = "PrintSheet";
var lastColLetter = "H"
var orientation = "false"; // portrait
var lastRow = printSheet.getLastRow();
var rng = "gid=" + printSheet.getSheetId().toString() + "&range=A1:" + lastColLetter + lastRow + "&";
var url = "https://docs.google.com/spreadsheets/d/" + ss.getId() + "/export" +
"?format=pdf&" +
rng +
"size=7&" +
"fzr=true&" +
"portrait=" + orientation + "&" +
"fitw=true&" +
"gridlines=false&" +
"printtitle=false&" +
"sheetnames=false&" +
"pagenum=CENTER&" +
"horizontal_alignment=CENTER&" +
"vertical_alignment=TOP&" +
"top_margin=0.6&left_margin=0.6&right_margin=0.6&bottom_margin=0.6&" +
"scale=2&" +
"attachment=true";
DownloadPDFFromUrl2(url, fileName, "Downloading PDF: " + fileName);
} // ends estimateRowHeightsPDF() func
The following helping functions are taken from stakeOverFlow only. Other functions used in above code are there in 'HelpingFuncs.gs' file.
// If some fonts (at least one) are Gujarati, then returns true
function includesGujaratiFont(str){
return /[\u0A80-\u0AFF]/.test(str);
}
// From http://stackoverflow.com/questions/1353684
// Returns 'true' if variable d is a date object.
function isValidDate(d) {
if ( Object.prototype.toString.call(d) !== "[object Date]" )
return false;
return !isNaN(d.getTime());
}