Hi. I'm Dave, the internet addict behind FeedbackFair, Cheatography and Envoy.

Lab

Open source projects, code snippets and random tools.

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XSS Alarm Userscript

A user script for Opera, Firefox and Chrome that notifies you when a site is loading scripts from unrecognised third parties to help you spot potential XSS attacks more easily.

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11 September 2008 | 10 comments

PHP Querystring Functions

Adding and removing variables to and from URLs using PHP can be a relatively simple process admittedly, but I have a couple of functions I use often to make the process even less time-consuming.

Add Querystring Variable

A PHP function that will add the querystring variable $key with a value $value to $url. If $key is already specified within $url, it will replace it.

function add_querystring_var($url, $key, $value) {
    $url = preg_replace('/(.*)(?|&)' . $key . '=[^&]+?(&)(.*)/i', '$1$2$4', $url . '&');
    $url = substr($url, 0, -1);
    if (strpos($url, '?') === false) {
        return ($url . '?' . $key . '=' . $value);
    } else {
        return ($url . '&' . $key . '=' . $value);
    }
}

Remove Querystring Variable

A PHP function that will remove the variable $key and its value from the given $url.

function remove_querystring_var($url, $key) {
    $url = preg_replace('/(.*)(?|&)' . $key . '=[^&]+?(&)(.*)/i', '$1$2$4', $url . '&');
    $url = substr($url, 0, -1);
    return ($url);
}

05 December 2006 | 49 comments | links, code, development, url, querystring, reference, php, functions, programming, tips, variable

Numbered Google Results User Script

A user script for Opera and Firefox that automatically numbers Google search results. Updated 16 Nov 2006 following changes to Google results page code.

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16 November 2006 | 49 comments | hacking, firefox, google, greasemonkey

The Search Jump user script provides a quick way to compare searches on various engines (or just to jump to another engine when the one you are using has poor results). It provides a small box at the bottom right of a search window, with links to the same search at other major search engines.

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31 May 2006 | 10 comments | greasemonkey

Internet Country Codes

A list of country level domain names, ordered by country or domain name.

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07 October 2005 | 21 comments | cheatsheet, webdev, reference, domain, domains, tld, codes, dns, internet, resources, country

"Select All" JavaScript for Forms Posting to an Array

The problem that led to this snippet of code was that when posting from a form to a PHP script, you may sometimes want to have several fields with the same name and different values. For example, you might want people to be able to tick boxes to indicate which cities they have been to from a list. You would normally add "[]" to the name of the field inputs, like so:

<input type="checkbox" name="cities[]" value="London"> London
<input type="checkbox" name="cities[]" value="Paris"> Paris
<input type="checkbox" name="cities[]" value="Berlin"> Berlin
<input type="checkbox" name="cities[]" value="Madrid"> Madrid
<input type="checkbox" name="cities[]" value="Rome"> Rome

When the form is received by PHP, whichever items are ticked in the cities list above are accessible in the array $_POST['cities']. This is very handy.

Unfortunately, the addition of square brackets causes trouble with JavaScript, especially with a "Select All" function - which allows you to check all boxes at once by clicking a single one. This script works around that using regular expressions.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Checkbox Fun</title>
<script type="text/javascript"><!--
 
var formblock;
var forminputs;
 
function prepare() {
  formblock= document.getElementById('form_id');
  forminputs = formblock.getElementsByTagName('input');
}
 
function select_all(name, value) {
  for (i = 0; i < forminputs.length; i++) {
    // regex here to check name attribute
    var regex = new RegExp(name, "i");
    if (regex.test(forminputs[i].getAttribute('name'))) {
      if (value == '1') {
        forminputs[i].checked = true;
      } else {
        forminputs[i].checked = false;
  }
    }
  }
}
 
if (window.addEventListener) {
  window.addEventListener("load", prepare, false);
} else if (window.attachEvent) {
  window.attachEvent("onload", prepare)
} else if (document.getElementById) {
  window.onload = prepare;
}
 
//--></script>
</head>
 
<body>
 
<form id="form_id" name="myform" method="get" action="search.php">
 
  <a href="#" onClick="select_all('area', '1');">Check All Fruit</a> | <a href="#" onClick="select_all('area', '0');">Uncheck All 
Fruit</a><br><br>
 
  <input type="checkbox" name="area[]" value="1" />Apples<br />
  <input type="checkbox" name="area[]" value="2" />Bananas<br />
  <input type="checkbox" name="area[]" value="3" />Chickens<br />
  <input type="checkbox" name="area[]" value="4" />Stoats
 
  <br><br><a href="#" onClick="select_all('location', '1');">Check All Locations</a> | <a href="#" onClick="select_all('location', 
'0');">Uncheck All Locations</a><br><br>
 
  <input type="checkbox" name="location[]" value="1" />Brighton<br />
  <input type="checkbox" name="location[]" value="2" />Hove<br />
 
</form>
 
</body>
</html>

28 July 2005 | 54 comments | select, html, php, array, forms, javascript, checkboxes, form, all