How to append a string value during assignment in Javascript?

Question

Hey i dont know if that is possible but i want to set a given variable in js by reference.

What i want to do is, that each time i pass a string to the function addstring that the value of the textfield is added like +=

function addstring(string)
{
    document.getElementById("string").value = string; // its a textfield

}

How can i do that?

Answer 1

Javascript does not support passing parameters by reference.

This link offers a good breakdown and some workarounds- Passing by Value or reference

Answer 2

If its a reference to an input text filed then you can use the value property

function addstring(string)
{
    document.getElementById("string").value += string.value;

}

See value