Get row & column indices of found value - google-apps-script

Question

How do I get the row and column indices of the cell containing a value I'm looking for?
Here's an example of two sheets, "Grave" and "Data_grave":
My code, below, should...
First, get a specific value in sheet "Grave" (in example value is - "Win").
Find the number of the row & column with this value in sheet "Data_grave".
Finally, it should write some data ("wow") near the found value "Win" (from column+1).
However, I receive an error message at line 17 (the line following my search loops):
Can't convert 4,4 to (class)
How do I solve that?
function myFind() {
var ss = SpreadsheetApp.getActive(), rowNum = [], collNum = [];
var findData = ss.getSheetByName('Grave').getRange("A2").getValue();
var searchData = ss.getSheetByName('Data_grave').getDataRange().getValues();
for(var i=1, iLen=findData.length; i<iLen; i++) {
for(var j=0, jLen=searchData.length; j<jLen; j++) {
for(var k=0, kLen=searchData[0].length; k<kLen; k++) {
var find = findData;
if(find == searchData[j][k]) {
rowNum.push([j+1]);
collNum.push([k+2]);
}
}
}
}
ss.getSheetByName('Data_grave').getRange(rowNum,collNum).setValue("wow");
}

Answer 1

As Adelin commented: the error message is indicating that you are not using .getRange(rowNum,collNum) properly. That method expects two numbers, but you're providing it two arrays.
When you've "found" the cell you're searching for, instead of push() (which treats rowNum and colNum as arrays), you simply want to use:
var rowNum = j+1;
var colNum = k+2;
You could also use a boolean found as an additional exit condition for all your loops, to stop searching upon success.
function myFind() {
var ss = SpreadsheetApp.getActive(), rowNum = [], collNum = [];
var findData = ss.getSheetByName('Grave').getRange("A2").getValue();
var searchData = ss.getSheetByName('Data_grave').getDataRange().getValues();
var found = false;
for(var i=1, iLen=findData.length; i<iLen && !found; i++) {
for(var j=0, jLen=searchData.length; j<jLen && !found; j++) {
for(var k=0, kLen=searchData[0].length; k<kLen && !found; k++) {
var find = findData;
if(find == searchData[j][k]) {
var rowNum = j+1;
var collNum = k+2;
found = true;
}
}
}
}
ss.getSheetByName('Data_grave').getRange(rowNum,collNum).setValue("wow");
}