Get Variables Data from two concatenated Strings

Question

I want to get the data from the Variable "EDDBGnd". the debug Paragraph should display "This is a test".

var Apt = "EDDB";
var Menu = "Gnd";
var EDDBGnd = "This is a test";

document.getElementById("debug").innerHTML = Apt.concat(Menu);

You could try `window[Apt + Menu]`, assuming `EDDBGnd` is in the global/`window` scope. — gen_Eric, Jan 25 '21 at 19:11
A better option would be to use an object to hold the `EDDBGnd` data, like `var data = {EDDBGnd: "This is a test"};` then you could do `data[Apt + Menu]`. — gen_Eric, Jan 25 '21 at 19:12
See also: [“Variable” variables in Javascript?](https://stackoverflow.com/questions/5187530/variable-variables-in-javascript) — 3limin4t0r, Jan 25 '21 at 19:23

score 1 · Answer 1 · answered Jan 25 '21 at 19:16

If you have the ability to use a different method to store the data, I would recommend using an object instead. This will allow you to have the apt as a key that can hold multiple menu's for example.

It is more complex, but it will allow you to easily grow the object for more data without messing with variables.

var data = {
  "EDDB": {
    "Gnd": "Test is a test",
    "Gnd2": "Test is also a test",
  }
}

document.getElementById("debug").innerHTML = data["EDDB"]["Gnd"];
document.getElementById("debug2").innerHTML = data["EDDB"]["Gnd2"];

<div id="debug"></div>
<div id="debug2"></div>

Have not tryed it, but it should work, but It would sadly not work with my array data structure Somebody else posted something that works; Thank you — aplayz, Jan 25 '21 at 20:45

score 1 · Answer 2 · answered Jan 25 '21 at 19:17

1

If EDDBGnd is a global variable you can write

document.getElementById("debug").innerHTML = window[Apt+Menu];

answered Jan 25 '21 at 19:17

Kshitij

649
5
8

score 0 · Answer 3 · answered Jan 25 '21 at 19:16

0

Try something like that:

document.getElementById("debug").elements[0].value = EDDBGnd;

answered Jan 25 '21 at 19:16

arevilla009

429
3
18

Mr. Polywhirl · Accepted Answer · 2021-01-25T19:23:57.027

You need to scope the global variables to the window object.

var Apt = "EDDB";
var Menu = "Gnd";
var EDDBGnd = "This is a test";

document.getElementById("debug").innerHTML =
  window[window.Apt.concat(window.Menu)];

<div id="debug"></div>

A better way is to create a context or localization file (or object).

const context = {
  'EDDB' : {
    'Gnd': 'This is a test'
  }
};

const Apt = 'EDDB'; // From GUI?
const Menu = 'Gnd'; // From GUI?

const getText = (Apt, Menu) => context[Apt][Menu];

document.getElementById("debug").innerHTML = getText('EDDB', 'Gnd');

<div id="debug"></div>

Get Variables Data from two concatenated Strings

4 Answers4