<form action=»foo»>
<input type=»text» onkeypress=»return bar(event)»>
<input type=»submit»>
</form>

<script type=»text/javascript»>
function bar(evt){
var k=evt.keyCode||evt.which;
return k!=13;
}
</script>

Note however that this «enter» key behavior isn’t standard (and actually behaves differently across user agents); moreover this won’t prevent you from full server-side checking, as a client can have javascript deactivated (or even trick your javascript at runtime).

function cff_php2js($a)
{
if (is_null($a)) return 'null';
if ($a === false) return 'false';
if ($a === true) return 'true';
if (is_scalar($a)) {
$a = addslashes($a);
$a = str_replace("\n", '\n', $a);
$a = str_replace("\r", '\r', $a);
$a = preg_replace('{(</)(script)}i', "$1'+'$2", $a);
if (is_numeric($a))
return "$a";
else
return "'$a'";
}
$isList = true;
for ($i=0, reset($a); $i<count($a); $i++, next($a))
if (key($a) !== $i) { $isList = false; break; }
$result = array();
if ($isList) {
foreach ($a as $v) $result[] = cff_php2js($v);
return '[ ' . implode(', ', $result) . ' ]'."\n";
} else {
foreach ($a as $k=>$v)
$result[] = cff_php2js($k) . ': ' . cff_php2js($v);
return '{ ' . implode(", ", $result) . ' }'."\n";
}
}

download the tablesort
http://www.frequency-decoder.com/demo/table-sort-revisited/js/tablesort.js

Home page of script:

http://www.frequency-decoder.com/demo/table-sort-revisited/script-sort/

You just have to make sure to use it on an associative array and not an object.
Example below

Good (assuming Object has not been overloaded or extended):

var array = new Object(); //this is safe only if you can assure object has not been extended.
//use the below if Object has been extended
var array;

//everything below here works fine regardless of the two above cases
array['something'] = ‘yay’;
array['somethingelse'] = ‘more’;

for ( keyVar in array ) {
alert(array[keyVar]);
}

Bad:

var array = new Array(); //uh oh, array is an object which means it’s an associative array

//the below loop will actually give you results, despite never putting «values» into
//the array variable. This is because array has functions defined from the Array() object
//which will be grabbed by the keyVar since objects are really associative arrays
for ( keyVar in array ) {
alert(array[keyVar]);
}

http://ajaxrain.com/