Rails spinoffs - May 2007 - Ajax.PeriodicalUpdater: Parameters Handling

Hello,

I am haveing a problem with the Ajax.PeriodicalUpdater.

What the script should do is updating an image every 5 seconds.
The ticker.php should receive an id and depending on that id deliver the
next image (which does have another id).
So I want the script to do is grabbing the current id and posting it via
Ajax.PeriodicalUpdater.
The problem is, that the id doesn''t seem to get updated. If I look into
Firebug it is always the id from the start of the script. It doesn''t
seem the problem of the ticker.php script because this does deliver a new
picture with a new id

This is the Script:

var AjaxUpdateSidebar = Class.create();
AjaxUpdateSidebar.prototype =  {
    initialize: function()
    {
        this.container    = $(''ticker'');

        new Ajax.PeriodicalUpdater(this.container,
''/ticker.php'', {
          method: ''post'',
          parameters: this.getParams(),
          frequency: 5
        });
    },

    getParams: function()
    {
        this.imgId = this.container.down(''img'').id;
        return ''id='' + this.imgId;
    }
}

So how can I pass a new parameter depending on the updated html block?

TIA,
Alex

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