Javascript HideRows (Google Sheet Script Editor)

Question

I am trying to hide all the row of a specific Sheet in a Google speadsheet (the spreasheet contains others sheets). The rows to be hidden are the one with an ID between two intergers given by a two prompt commands (first_r and last_r).

When I click on the button hide , I get the two prompt window, but then a "Finished script" but the row aren't hidden.
Here is my code

function hide(){
var ui = SpreadsheetApp.getUi();
var first_r_str = ui.prompt('First row to hide');
var last_r_str = ui.prompt("Last row to hide");
 var first_r = parseInt(first_r_str);
 var last_r = parseInt(last_r_str);   

var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName('MYSheet');

for (i = first_r; i <= last_r; i++){
sheet.hideRows(i); 
}

function onOpen() {
  var ui = SpreadsheetApp.getUi();
  ui.createMenu('Custom Menu')
      .addItem('Hide Rows', 'hide')
      .addToUi();
}

My code is in the script editor(from the spreadsheet top menu, select tools and then script editor)

Answer 1

Below code works perfectly fine, you missed to get the text value properly and can use the range.

Source Google Apps Script

function hide(){
var ui = SpreadsheetApp.getUi();
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheets()[0];

var startRow = ui.prompt('enter first').getResponseText();
var endRow = ui.prompt('enter last').getResponseText();
var range = sheet.getRange(startRow, 1, endRow);
ss.hideRow(range);

}

function onOpen() {
  var ui = SpreadsheetApp.getUi();
  ui.createMenu('Custom Menu')
      .addItem('Hide Rows', 'hide')
      .addToUi();
}

Answer 2

As MGA shows in his example the main problem is that you did not extract the text from the answer.

Since you have a consecutive range you should do one call to hideRows rather than looping, that is more efficient.

function hide(){
  var ui = SpreadsheetApp.getUi();
  var first_r_str = ui.prompt('First row to hide').getResponseText();
  var last_r_str = ui.prompt("Last row to hide").getResponseText();
  var first_r = parseInt(first_r_str);
  var last_r = parseInt(last_r_str);   

  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName('Sheet1');

  sheet.hideRows(first_r, last_r - first_r + 1); 
}