var blocktarget = $.trim( $blockTarget.val() ),
isEmpty = blocktarget === '',
isIp = mw.util.isIPv4Address( blocktarget, true ) || mw.util.isIPv6Address( blocktarget, true ),
var blocktarget = $.trim( $blockTarget.val() ),
isEmpty = blocktarget === '',
isIp = mw.util.isIPv4Address( blocktarget, true ) || mw.util.isIPv6Address( blocktarget, true ),