How do I write data in every last column? - google-apps-script

Question

I need to add a new column everyday and the data insertion will be done individually for the specific row comparing with the input... please tell me if it is correct or not.
will this piece of code work for adding new columns ever day and initialize all the entries by 0?
function trig(){
var builder = ScriptApp.newTrigger("addcol").timeBased().everyDays(1);
var trigger = builder.create();
}
function addcol(){
var cname = builder.atDate( day, month, year)
var column = eventRange.getLastColumn();
sheet.insertColumnAfter(column).setName(cname);
sheet.getRange("E1").setValue(new Date()).setNumberFormat('d/M/yyyy');
var col = [];
for(var n=0 ; n<s.getMaxRows();n++){
col.getLastColumn().push(['0']);
}
ss.getRange('N:N').setValues(col);
}
// now for the insertion part
here the sr will be compared to SRN from the sheet (E) and if it matches it will replace 0 with 1 in the last column added everyday. plese tell me will this work?
function doPost(e){
var action = e.parameter.action;
if(action == 'scanner'){
return scanner(e);
}
}
function scanner(e){
var srn = e.parameter.sr;
var C = sheet.getLastColumn();
var R = sheet.getLastRow();
for(i=1; i<=R; i++)
{
if (srn == sheet.getDataRange([i][2]))
{
sheet.getDataRange([i],[C]).push[(1)];
sheet.append([i],[C]);
return ContentService.createTextOutput("Success").setMimeType(ContentService.MimeType.TEXT);
break;
}
}
}

Answer 1

Time-based trigger:
There are no event objects associated with time-based triggers, so variables like eventRange cannot work. It seems like you want to use variables in addcol that are defined in trig (e.g. builder). That is not possible. Also, if you want your function to run once a day, there is no need for lines like this: builder.atDate(day, month, year)). The trigger will be created by running this function once:
function createTrigger(){
var builder = ScriptApp.newTrigger("addcol").timeBased().everyDays(1).create();
}
Adding column with 0's:
There are many problems with the function addcol:
Several uninitialized variables are being used (s, builder, eventRange).
Unexisting methods are being used: e.g.: setNumberFormat is a method of the Range class, not of the Date object. You should use Utilities.formatDate(date, timeZone, format) to format dates. Also, you are using setName when inserting a new column, but that changes the sheet name. Is that what you want to do? And also, cname is assigned a trigger builder as value, which I seriously doubt is your purpose. The same way, an array col does not have a method getLastColumn().
You could use this addcol function instead (change your sheet name, currently set to Your sheet name, and the timeZone in formatDate, currently set to GMT:
function addcol() {
var sheet = SpreadsheetApp.getActive().getSheetByName("Your sheet name"); // Change accordingly
var lastCol = sheet.getLastColumn();
var lastRow = sheet.getLastRow();
if (sheet.getMaxColumns() === lastCol) sheet.insertColumnAfter(lastCol);
var newCol = sheet.getRange(1, lastCol + 1, lastRow, 1);
var values = [];
values.push([Utilities.formatDate(new Date(), "GMT", "d/M/yyyy")]); // Change accordingly
for (var i = 1; i < sheet.getLastRow(); i++) {
values.push([0]);
}
newCol.setValues(values);
}
Replacing 0's with 1's:
Assuming that you are getting the function scanner to run correctly and that the parameter e.parameter.sr is getting populated correctly, you can do the following:
function scanner(e){
var srn = e.parameter.sr;
var C = sheet.getLastColumn();
var R = sheet.getLastRow();
for (i=1; i<=R; i++) {
if (srn == sheet.getRange(i, 2).getValue()) {
sheet.getRange(i, C).setValue(1);
}
}
}
Here you were also using unexisting methods or providing incorrect parameters:
The method getDataRange doesn't allow any argument, you should be using getRange(row, column), and provide the row and column indexes separated by commas, not as if trying to access a 2D array.
break terminates the current loop, so only use it if you only want to update 1 cell. The same goes for return which finishes current function execution.
Reference:
Spreadsheet Service
Installable Triggers

Answer 2

Short
No
Long
There are several problems with the script:
getDataRange() expects no arguments passed (docs only say it is the same as using getRange(yourSheet.getLastRow(), yourSheet.getLastColumn()), not that you should do it). Certainly it does not expect instances of Array (bracket [] notation wraps C and i, which are of type Number into one). Moreover, it returns a Range, which at the time of writing does not have push() method.
getLastColumn() returns an instance of Number, and thus does not have a push() method as well. You are on the right track, though, since col is an Array, and you need to push() into it.
If you want the script to add a zero-filled column, don't get constant ranges: in current state, getRange('N:N') guarantees that each time you will re-initialize column N. Btw, same goes for getRange("E1").
You still haven't addressed issues listed in comments to your previous question.
Also, in your scanner function there is a syntax error: push[(1)] should be push([1]).
Also, the sheet variable is either undeclared or is declared globally, which is bad.
Notes
If you don't expect number of students to change dynamically, you can switch from getMaxRows() to getLastRow() to only zero-fill cells that are in range of cureent student info grid.
This question is a direct continuation of a currently closed one (please, always disclose that for reference at least).
How about skipping init to zero step at all? If cell is empty, getValue() / getValues() will return its value as an empty string, which is a falsy value, just as 0 is. If you want to count attendance at the end of period, a simple conditional will suffice to sum up.
The default MIME type for TextOutput instance obtained by createTextOutput() is plain text, so setting it to ContentService.MimeType.TEXT is an overkill in your case.
Reference
getDataRange() docs
getLastColumn() docs
getValue() docs
getValues() docs
Range docs
createTextOutput() docs
Falsy values explanation on MDN