How to keep lock a cell value even if the condition changed? - google-sheets

Question

please refer to the images below
Sheet1
sheet2
I have 2 sheets: sheet1 and sheet2, here's what I want to do: if sheet2!B37 = sheet1!B1, take the value of sheet1!B2, if not stay blank.
This part is easy, but what I want is that if I change the date in sheet1!B1 to 16 Mar 2021 and sheet1!B2 to 90, I want sheet2!C37 to stay 100 and sheet2!C38 returns 90.

Answer 1

One way is to copy the content of sheet2!C37 and paste it as value.
Reference: Convert formulas to values in Google Sheets
But I doubt that you would want to convert the formula into a value every time you need to change the condition. Hence, you might want to consider using Google Apps Script and run it using a button.
Sample Code:
function updatePrice() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
//Get Sheet1 object
var sheet1 = ss.getSheetByName("Sheet1");
//Get Sheet1 object
var sheet2 = ss.getSheetByName("Sheet2");
//Get Sheet1!B1 string value
var targetDate = sheet1.getRange("B1").getDisplayValue();
//Get Sheet1!B2 string value
var targetPrice = sheet1.getRange("B2").getDisplayValue();
//Get Sheet2 column B range
var dates = sheet2.getRange("B1:B");
//Create a textfinder and look for the target date (Sheet1!B1 value)
var textFinder = dates.createTextFinder(targetDate);
var firstOccurrence = textFinder.findNext();
if(firstOccurrence!=null){
//Date found
//Update price in column C
firstOccurrence.offset(0,1).setValue(targetPrice);
}
}
What it does?
Get the active spreadsheet using SpreadsheetApp.getActiveSpreadsheet()
Get the sheet object for Sheet1 and Sheet2 using Spreadsheet.getSheetByName(name)
Select the range for Sheet1!B1 and Sheet1!B2 using Sheet.getRange(a1Notation). Get the string value using Range.getDisplayValue()
Select the range for Sheet2!B1:B using [Sheet.getRange(a1Notation)]
Create a textFinder using Range.createTextFinder(findText)
Get the first occurrence of the date string that was being searched using TextFinder.findNext(). If date string has no match, return will be null. If date string has match it will return a Range of the matching cell
Matching cell will give you a range in column B, to set the price value move the range 1 column to the right by adding 1 column offset using Range.offset(rowOffset, columnOffset) and set the range value using Range.setValue(value)
Add A Google Sheets Button To Run Scripts
Add a Google Sheets button. You add a button via the Insert > Drawing menu.
Click Save and Close, this drawing gets added to your Google Sheet. You can right click on it to resize it or drag it around to reposition it.
To assign a script, Right Click the drawing and click the three little dots in the top right of the drawing and select Assign Script. Then type in the name of the function you want to run from your Apps Script code.
Output:
Note:
Please don't forget to click enter when editing your Sheet1 values before clicking the button. Apps Script cannot update Sheet2 when the cell to be read is still in edit.