Is it possible to use a variable to call an object who's name is the same as the variables value?

Question

Let's say I have a function which is being passed a string which originally came from getElementById, and I have an object with the same name as that string's value, is there a way to call that object? I won't know which object I want until I get that value from the element's ID.

For Instance:

StartingFunction(SomeID){
someVariable = document.getElementById(SomeID).id
somefuntion(someVariable)
}

someFunction(ElementID){
// need to call Object.Value of whichever object is named the same as the value of   
//ElementID here

}

ElementID.Value obviously won't work since ElementID is just a variable, not an object...

Answer 1

What you call ElementID is actually the element itself because you are passing document.getElementById() into somefunction.

Answer 2

if function is in global scope you can just window[ElementID] for example:

   someFunction(ElementID){
        return window[ElementID].value;

    }

Answer 3

You can pass the element directly to someFunction.

For example:

StartingFunction(SomeID){
  var element = document.getElementById(SomeID);
  somefuntion(element);
}

someFunction(element){
  alert(element.id);
  alert(element.value);
  // Any other processing you want to do with element
}

Or if you need to be able to get an element from an id just use getElementById

someFunction(id) {
  var element = document.getElementById(id);
  alert(element.value);
  // Any other processing you need to do with the element DOM object
}

Answer 4

Don't do that. This is bad design and will lead to enormous pain and hard-to-find bugs down the road.

Instead, use a global object that has all of the objects you want to reference.

var valueMap = new Object();

function setValue(id, valueObject) {
    valueMap[id] = valueObject;
}

function someFunction(id) {
    return valueMap[id].Value;
}

Answer 5

This makes no sense:

someVariable = document.getElementById(SomeID).id

You are fetching the id of the element with id SomeID...why not just use SomeID?

If you want the value attribute of the object with id SomeID, just do:

document.getElementById(SomeID).value