jQuery Document Ready Shorthand

You should always start your jQuery using the ready() function. The handler passed to .ready() function is guaranteed to be executed after the DOM is ready.

There are a few ways to start your jQuery function, but all are equivalent:

$(document).ready(function() {
  // Do some magic
});

$().ready(function() {
  // A bit quicker to write
});

$(function() {
  // Nice shorthand that I prefer to use
});

jQuery Sytax Error - Unrecognized Expression

A recent upgrade to jQuery 1.5 from 1.2 highlighted a problem with jQuery expressions which resulted in a number of javascript errors...

Syntax error, unrecognized expression: [@attributename=value]' when calling ...

Some digging highlighted that attribute selectors, since jQuery 1.3 and above no longer use the @ syntax. This actually had been deprecated since version 1.1.4, but only from version 1.3 is it no longer supported.

Old way (pre jQuery 1.3)...

$("#holder input[@value=contacts2]");

New way (post jQuery 1.3)...

$("#holder input[value=contacts2]")