Question

I have a variable with a value, let’s say

var myVarMAX = 5;

In HTML I have an element with id="myVar".

I combine the id with the string MAX (creating a string myVarMAX). My question is how can I use this string to access a variable with the same name?

Answer 1

You COULD use eval, but if you have the var in the window scope, this is better

var myVarMAX = 5;
var id="MAX"; // likely not in a var

alert(window["myVar"+id]); // alerts 5

However Don’t pollute the global scope!

A better solution is something like what is suggested in the link I posted

var myVars = {
  "myVarMin":1,
  "myVarMax":5,
  "otherVarXX":"fred"
} // notice no comma after the last var

then you have

alert(myVars[“myVar”+id]);