Firefox java script error in prototype.js

Rails
1

Hi,

I am usign two selects, a master and a slave:

<%= select(“master”, “id”, @master) %>

<%= select("slave", "id", @slave) %>
<%= observe_field("master[id]", :frequency => 0.25, :update => "slave_id_list", :url => {:action => :update_slave_select}, :with => "'my_id='+value") %>

also I made:

def index
@master = …
@slave= …
end

def update_slave_select
@slave= …
render(:partial => ‘select’)
end

and in _select.rhtml:

<%= select(“slave”, “id”, @slave) %>

This works fine in internet explorer, in firefox I have the following
javascript
error:

Error: element has no properties
Source File: http://localhost:3000/javascripts/prototype.js
Line: 1280

and the javascript code at prototype:

Form.Element = {
serialize: function(element) {
element = $(element);
var method = element.tagName.toLowerCase();
var parameter = Form.Element.Serializersmethod;

if (parameter) {
  var key = encodeURIComponent(parameter[0]);
  if (key.length == 0) return;

  if (parameter[1].constructor != Array)
    parameter[1] = [parameter[1]];

  return parameter[1].map(function(value) {
    return key + '=' + encodeURIComponent(value);
  }).join('&');
}

},

getValue: function(element) {
element = $(element);

var method = element.tagName.toLowerCase();
var parameter = Form.Element.Serializersmethod;

if (parameter)
  return parameter[1];

}
}

Any sugestion for solving this?

Thanks,

Paulo A.

2

[email protected] wrote:

<%= observe_field(“master[id]”,
…
This works fine in internet explorer, in firefox I have the following javascript
error:
…
Error: element has no properties

Try
<%= observe_field(“master_id”,

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