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Something I whipped up and thought I'd share to help tame a stubborn feature. Adapted from Wikipedia's dynamic navigation bars code. Uses JavaScript to hide the "Read more" section if a page contains a table with "navbox" class.

Add to your MediaWiki:Common.js:

function hideReadMore()
    // iterate over all < table >-elements 
    tables = document.getElementsByTagName("table");
    for( var i=0; NavboxTable = tables[i]; i++ )
        if (hasClass(NavboxTable, "navbox"))
            // if found a navbox table, iterate over all < nav >-elements
            navs = document.getElementsByTagName("nav");
            for( var j=0; RPMNav = navs[j]; j++ )
                if (hasClass(RPMNav, "RelatedPagesModule"))
                    // for each RelatedPagesModule nav, hide it
                    RPMNav.setAttribute('style', 'display:none;');
            // only need to do this for the first navbox table we find
addOnloadHook( hideReadMore );

If the table in your navbox template doesn't already have the "navbox" class, change this:

{| class="wikitable" ...

to this:

{| class="wikitable navbox" ...

Rigel Kent 01:09, May 16, 2012 (UTC)

Could you please direct me to a page where this error is happening? I don't think I've ever seen this "read more" thing. Course, maybe that's because I've just never used the navbox class. Surely if there's a problem with navbox, the simpler solution is just not to use that class. Creating a new class seems a simpler, non-JS way to solve the problem. Why not just create table.nav-box or another name of your choosing? czechout@fandom    fly tardis  <span style="">01:17: Wed 16 May 2012 
The code works perfectly. (I think.) Just sharing for anyone who wants to copy it. Rigel Kent 01:26, May 16, 2012 (UTC)
I'm sure it does work :) You'd obviously have no interest in posting code that didn't. I don't doubt your coding skill in the slightest. I just a) have never seen this problem (and would like to!) and b) don't understand why a JS solution would be better than just changing the CSS class to something which isn't affected by the problems associated with navbox. czechout@fandom    fly tardis  <span style="">01:42: Wed 16 May 2012 
Oh, I see what you mean!
By stubborn feature, I meant "Read more" is stubborn, not navboxes. I love navboxes, doesn't everyone?
This script keeps navboxes, which editors put it when wanted, from getting crowded out by a redundant "Read more" on the same page, which editors may not want. While still allowing "Read more" to appear on pages without navboxes. Rigel Kent 03:34, May 16, 2012 (UTC)
Yeah, but where does this "read more" occur? I've never seen it before. Can you direct me to a page somewhere that it's happening? czechout@fandom    fly tardis  <span style="">14:02: Wed 16 May 2012 
The "Read more" section is added to the bottom of most pages on wikis where the extension is enabled. For example, look at the bottom of this page: --Gardimuer { ʈalk } 16:17, May 16, 2012 (UTC)