Resolved How do I use a string variable as a "name"?

[bobleny]

I have this function:

function SelectedRadio(form, name)
{
	for(var i = 0; i < form.name.length; i++)
	{
		if(form.name[i].checked == true)
		{
			return form.name[i].value;
		}
	}

	return "Error!";
}

Form is a form object, and name is a string of the name of the radio button.

I thought it was trying to use the variable name as the name of a field. For example:

function OnFormSubmit(form)
{
	SelectedRadio(form, "fruits")
}

Instead of form.fruits its using form.name. Basically I am trying to use the variable as a string.

Is there anyway around this?

[Logic Ali]

form[ name ][ i ]

It would be better to pass a reference to the radio group:

function getRadioValue( group )
{
  if( group.length )
    for( var i = 0; i < group.length && !group[ i ].checked; i++ )
    ;

  return group.length && i != group.length ? group[ i ].value : group.checked ? group.value : "" ;
}

[bobleny]

It would be better to pass a reference to the radio group:

That's what I was doing because I couldn't figure out how to make it work the other way.

form[ name ][ i ]

Oh, but why no dot (.) between form and [name]?

[devnull69]

You have a string as the name parameter. A string in javascript is represented by a sequence of characters surrounded by quotes.

This is a string

"fruits"

If you use form.name in that case it will become

from."fruits"

which will result in an error, whereas form[name] will give

form["fruits"]

which is perfectly legal.