From Wikipedia
function considerChangingExpiryFocus() {
if (!document.getElementById) {
return;
}
var drop = document.getElementById('wpBlockExpiry');
if (!drop) {
return;
}
var field = document.getElementById('wpBlockOther');
if (!field) {
return;
}
var opt = drop.value;
if (opt == 'other') {
field.style.display = '';
} else {
field.style.display = 'none';
}
}
function considerChangingReasonFocus() {
if (!document.getElementById) {
return;
}
var drop = document.getElementById('wpBlockReasonList');
if (!drop) {
return;
}
var field = document.getElementById('wpBlockReason');
if (!field) {
return;
}
var opt = drop.value;
if (opt == 'other') {
field.style.display = '';
} else {
field.style.display = 'none';
}
}
function updateBlockOptions() {
if (!document.getElementById)
return;
var target = document.getElementById('mw-bi-target');
if (!target)
return;
var addy = target.value;
var isEmpty = addy.match(/^\s*$/);
var isIp = addy.match(/^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}|:(:[0-9A-Fa-f]{1,4}){1,7}|[0-9A-Fa-f]{1,4}(:{1,2}[0-9A-Fa-f]{1,4}|::$){1,7})(\/\d+)?$/);
/*
var anonymousCheck = document.getElementById('wpAnonOnly');
anonymousCheck.disabled = !isIp && !isEmpty;
var autoblockCheck = document.getElementById('wpEnableAutoblock');
autoblockCheck.disabled = isIp && !isEmpty;
*/
var anonymousRow = document.getElementById('wpAnonOnlyRow');
anonymousRow.style.display = (!isIp && !isEmpty) ? 'none' : '';
var autoblockRow = document.getElementById('wpEnableAutoblockRow');
autoblockRow.style.display = isIp && !isEmpty ? 'none' : '';
}