It's a bit confusing... and different themes deal with it differently. But the underlying concept here that you are missing is that a module must be responsible for a block. So in the case of "block-block-1" it is the block module that is responsible. The menu module (as many other modules) also creates blocks. So you might see "block-menu-1". For each controlling module, the numbering starts over.

But some themes don't use the "delta" or at least not in certain situations. Like I just looked at a site (I think I used Genesis there) where I saw "block-menu-nav" where "nav" was the name of the menu. There was no delta. And on another site using Zen and Panels I saw a block in a panel get "pane-menu-block-1. So now I've confused you. But I think I've gotten you over the hump here, conceptually, yes? A module always "owns" a block.

On Thu, Sep 30, 2010 at 11:27 AM, Broyhill, Gary <Gary.Broyhill@lr.edu> wrote:

I’ve got a CSS problem related to block.tpl.php . I was looking at the API for block.tpl.php, and I’m a little confused over how Drupal assigns the block-block-x ID to come up with block-block-1, block-block2, etc.

>From the API: <div id="block-<?php print $block->module .'-'. $block->delta; ?>" class="block block-<?php print $block->module ?>">

So I see that the ID value comes from "block-<?php print $block->module .'-'. $block->delta; ?>" but where its the numbering controlled?

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Gary Broyhill
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Lenoir-Rhyne University
www.lr.edu
gary.broyhill@lr.edu
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