Auto hide/unhide rows Google Spreadsheet - google-sheets

Question

I'm trying to make a google spreadsheet script.
When the value of a cell changes to a specified value I want it to trigger hide/unhide rows.
Here is my script so far:
function autoHide() {
var ss = SpreadsheetApp.getActive()
var sheet = SpreadsheetApp.getActiveSheet()
var cell = ss.getActiveCell()
var cell1 = ("C12");
if (cell1 == "Others" ) {
ss.getActiveSheet().showRows(14, 3);
}
else if (cell1 == "Additional Discount/s (over and above 25%)" ) {
ss.getActiveSheet().showRows(17, 4);
}
else {
ss.getActiveSheet().hideRows(14, 7)
}
}

Answer 1

Your question is a little unclear about some points so I assumed you wanted to track the value of cell C12 when C12 is edited.
function autoHide() {
var ss = SpreadsheetApp.getActive();
var sheet = ss.getActiveSheet();
var cell = ss.getActiveCell();
var value = cell.getValue();
var cellRef = cell.getA1Notation();
if (cellRef !== "C12") return;
// This isn't the cell we are looking for, stop executing the function.
if (value === "Others" ) {
sheet.showRows(14, 3);
} else if (value === "Additional Discount/s (over and above 25%)" ) {
sheet.showRows(17, 4);
} else {
sheet.hideRows(14, 7);
}
}
If you want to run the function anytime any cell is edited, use this code.
Useful if C12 is a formula and is not updated manually.
function autoHide() {
var ss = SpreadsheetApp.getActive();
var sheet = ss.getActiveSheet();
var cellRef = "C12";
var cell = sheet.getRange(cellRef);
var value = cell.getValue();
if (value === "Others" ) {
sheet.showRows(14, 3);
} else if (value === "Additional Discount/s (over and above 25%)" ) {
sheet.showRows(17, 4);
} else {
sheet.hideRows(14, 7);
}
}