And Slaters Go Plop

The CSS property ‘max-width’ and ‘max-height’ doesn’t work in Internet Explorer 6. Here’s a workaround:

.myclass {
width:expression(this.width > 100 ? (this.height > this.width ? (this.width / this.height) * 100 : 100) : true);
}

What does this do? It executes a bit of javascript within the CSS that goes along the lines of “If the width is greater than 100 pixels then set the width to 100 – unless the height is greater than the width, in which case scale it down to the difference between the width and the height – otherwise just leave it as it is”.

This means that any element that is of .myclass will fit proportionately into a 100×100 area (change the 100 for whatever max-width or max-height you require).

I hope this saves someone from having to figure this out in the future.

At least something
/.+/

A positive integer
/^\d*$/

A decimal number
/^\d*\.?\d/

A valid email address
/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/

A valid web address
/^(http:\/\/)?\w+([\.-]?\w+)*\w+([\.-]?\w+)*(\.\w+)+(\/)?(\w+)?$/

A hexadecimal colour (6 chars)
/^#?[0-9A-Fa-f]{6}$/

How to use in Javascript:
var testString = "ff0000";
var pattern = /^#?[0-9A-Fa-f]{6}$/;
if (testString.match(pattern)) DoSomething();

How to use in PHP:
$testString = 'ff0000';
$pattern = '/^#?[0-9A-Fa-f]{6}$/';
if (preg_match($pattern, $testString) DoSomething();

How to use in C#:
string testString = "ff0000";
string pattern = @"^#?[0-9A-Fa-f]{6}$";
Match m = Regex.Match(testString, pattern);
if (m.Success) DoSomething();

If you have direct access to your database you can change the number of recent comments that are displayed on your homepage in WordPress. I use phpMyAdmin to manage my database. Here’s what you need to do:

1. Go to the wp_options table in your database
2. Browse the data in this table and find the option with the name ‘widget_recent_comments’
3. Edit this option and change the last number (it should be ’5′ by default) to the number of recent comments you would like to display: a:2:{s:5:"title";s:0:"";s:6:"number";i:5;}

Of course, it’s quite likely that there is a setting for this in the admin panel that I’ve overlooked – I was unable to find it.

I’ve been HTML-ing and CSS-ing for years now and had never come across this before: To make the content within a div tag (or any other block tag) scrollable all you need to do is fix the width and/or height and add overflow:scroll; to the style for the tag.

You can also set individual scrollbars with overflow-x:scroll; or overflow-x:hidden; and overflow-y:scroll; or overflow-y:hidden;.

I can’t believe I missed out on this one. Perhaps I need to go back to the CSS specification and work through each attribute one by one.

#!  /usr/bin/python2.5
import os

mydir = "/path/to/directory"
mysearch = "text to find"
myreplace = "Text to replace"

def doReplace(filePath):
    fin = open(filePath, "r")
    s = fin.read()
    fin.flush()
    fin.close()
    fout = open(filePath, "w")
    s = s.replace(mysearch, myreplace)
    fout.write(s)
    fout.close()

for root, dirs, files in os.walk(mydir):
    for f in files:
        name, ext = os.path.splitext(f)
        if ext == '.html':
            doReplace(root + '/' + f)

Explanation: This will find all files ending in .html in the directory specified in mydir along with all matching files in any subfolders and will replace the text specified in mysearch with the text in myreplace. It’s only been tested on Linux but with a bit of tweaking will run on Windows and Mac.

After experimenting with CakePHP, Zend, Ruby on Rails, Django, Turbogears, Pylons and DotNetNuke I have given up on lumbering MVC frameworks. The kind of work I do is either too small or too specialised and using a MVC framework is either massive overkill or I have to spend days trying to hack the code to join a database table in just the way I want it or connect to a webservice.

This kind of sweeping statement is not going to earn me a lot of friends. The people who are into these frameworks are devout to say the least.

Probably my biggest gripe is that the whole idea of a MVC framework is to have separation of Model, View and Controller but if you ever build a site using one of these frameworks and attempt to uncouple these components you’ll quickly see that the touted separation is not all it’s cracked up to be.

The idea of having a templating language is inspiring but the fact that there is no defined standard for templating means that Smarty only works with PHP, Kid only works with Python and so on. I take it back; XSLT is a standard but it’s got to be the ugliest, most convoluted language out there.

Defining your model is exciting when you’re starting a Hello World project from scratch but can be pretty tiring when you’ve had to make it fit an existing database that doesn’t conform to the pluralised, *_id-ised requirements of your particular framework. And on top of that you have to relearn your particular framework’s substitutions for the SQL you’ve already had to learn. “DRY” anyone?

Don’t get me wrong, the MVC way of working makes a lot of sense. I use mod_rewrite call a Controller file which in turn feeds data from my Model class to my View class. But I don’t make my Model speak anything other than SQL if I’m accessing a MySQL database and I use <?php ?> blocks in my templates if I’ve chosen PHP as my language du jour. Why learn two additional, less powerful languages?

I agree that there are many situations where you would be better off developing a large website using a traditional MVC framework but I would be under any illusion that it’ll be any more flexible a year down the track.

For me, redemption would come in the form of a standardised templating language and a standardised set of classes for models that easily integrate into existing databases as well as being able to generate new ones.

If you’re creating a small or a fiddly website then I would advise you separate your data from your logic from your presentation but steer clear of the lumbering behemoths that occupy the MVC space at the moment.

This is regarding the email application for Linux called Evolution, not some ethereal take on natural selection.

After hours of searching the web I found how to get spam filtering working properly in Evolution. First, make sure that the Spamassassin plugin is unchecked and that the Bogofilter plugin is checked. Now make sure you have bogofilter installed – go to the terminal and type sudo apt-get install bogofilter. You may have to restart Evolution for the new settings to take effect.

Now here’s the trick: Bogofilter needs to know what you define as spam and what you define as ham (not spam). I suggest you make a new folder and fill it with both real messages and spam messages. Mark all the genuine emails as important. Now select the all and hit Ctrl-J or mark them as junk. It’ll move them all to the junk folder and will remember that this is what you think spam is. Now you need to go to your junk folder and select all the ones you’ve marked as important (the ham emails) and hit Ctrl-Shift-J or mark them as not junk. It’ll now move all the good ones back.

I realise it’s really counter-intuitive but it’s the only way I’ve found to get it working. I’m not sure whether it’s OK to turn the Spamassassin plugin back on. If anyone has anything to add please let me know.

If you ever get the error “tar: z: Cannot Open: No such file or directory” when attempting to uncompress a file via the command line you need to gzip it first.

So first type gzip -d your.file.tar.gz and then type tar -xvf your.file.tar (notice the missing .gz).