Are add() and appendChild() the same for select DOM objects?

I'm working on a small web application that changes the contents of a select drop-down.

I was wondering if appendChild() and add() both accomplish the same task on a select DOM object 开发者_开发问答in JavaScript?

var someSelect = document.getElementById('select-list');
var newOption = document.createElement('option');
someSelect.appendChild(newOption);
// The above is the same as the following?
someSelect.add(newOption);

If you want to be sure of cross-browser compatibility when manipulating options within a <select>, the surest way is to use its options property and populate it with Option objects. The following time-honoured method works in all scriptable browsers since the late 1990s:

var options = select.options;
options[options.length] = new Option("Option text", "option_value");

In this case, I believe they would accomplish the same task.

add( ) is provided specially via the HTMLSelectElement interface specifically to add options to a select element and has a few extra options (such as an optional index at which to add the new option, etc.).

appendChild( ) will give you a straight append of the child node.

Watch out for different implementations of both methods cross-browser: I think that would be your biggest pain point. IIRC, the IEs would cause problems when appending children to selects, so you might want to add if that method exists and fall back on appendChild.

I think it should be equivalent, but here you can find a question which remarks the different implementations when you try to work with option groups:

SELECT box: On IE item is added to OptGroup instead of root. FF ok

IE fails to add a new option "in the root" when there is already group inside the select element.