////////////////////////////////////////////////////////////////////////////////////////// // Returns the value for any type of form element // By Blair Robertson -> 2001 // // if select box or group of radio buttons returns the selected/checked value(s) // -> for multi-select boxes returns an array of selected values // if array of any other type of elements returns the value of the first element in array //////////////////////////////////////////////////////////////////////////////////////////// function elementValue(element) { // if element doesn't exist, die if (element == null) { return ""; } // if its null then probably because it's an array, take the type from the first element if (element.type == null) { element.type = element[0].type; } switch (element.type) { case "select-one" : if (element.selectedIndex >= 0) { return (element.options[element.selectedIndex].value) } break; case "select-multiple" : if (element.selectedIndex >= 0) { var retArr = new Array(); for(var i = 0; i < element.options.length; i++) { if (element.options[i].selected) { retArr.push(element.options[i].value); }// endif }// end for if (retArr.length > 0) { return (retArr); } } break; case "radio" : // if its an array of radio buttons then cycle through them if (element.length != null) { for(var i = 0; i < element.length; i++) { if (element[i].checked) { return(element[i].value); }// endif }// end for } else { return(element.value); } break; default : // if its an array of elements return the first ones value if (element.length != null) { return(element[0].value); } else // just return the value { return(element.value); } }// end switch // else something not right so return blank return ""; }// end elementValue() ////////////////////////////////////////////////////////////////////////////////////////// // Checks a specific radio button with the element, that has the passed value // By Blair Robertson -> 2001 //////////////////////////////////////////////////////////////////////////////////////////// function checkRadioButton(element, field_val) { for(var i = 0; i < element.length; i++) { if (element[i].value == field_val) { element[i].checked = true; break; } }// end for return; }// end checkRadioButton() ////////////////////////////////////////////////////////////////////////////////////////// // Changes: Sandeep V. Tamhankar (stamhankar@hotmail.com) // 1.1.2: Fixed a bug where trailing . in e-mail address was passing // (the bug is actually in the weak regexp engine of the browser; I // simplified the regexps to make it work). // 1.1.1: Removed restriction that countries must be preceded by a domain, // so abc@host.uk is now legal. However, there's still the // restriction that an address must end in a two or three letter // word. // 1.1: Rewrote most of the function to conform more closely to RFC 822. // 1.0: Original ////////////////////////////////////////////////////////////////////////////////////////// function emailCheck(emailStr) { // if true then the alert messages are shown when the function fails var show_alert = false; /* The following pattern is used to check if the entered e-mail address fits the user@domain format. It also is used to separate the username from the domain. */ var emailPat=/^(.+)@(.+)$/ /* The following string represents the pattern for matching all special characters. We don't want to allow special characters in the address. These characters include ( ) < > @ , ; : \ " . [ ] */ var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]" /* The following string represents the range of characters allowed in a username or domainname. It really states which chars aren't allowed. */ var validChars="\[^\\s" + specialChars + "\]" /* The following pattern applies if the "user" is a quoted string (in which case, there are no rules about which characters are allowed and which aren't; anything goes). E.g. "jiminy cricket"@disney.com is a legal e-mail address. */ var quotedUser="(\"[^\"]*\")" /* The following pattern applies for domains that are IP addresses, rather than symbolic names. E.g. joe@[123.124.233.4] is a legal e-mail address. NOTE: The square brackets are required. */ var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/ /* The following string represents an atom (basically a series of non-special characters.) */ var atom=validChars + '+' /* The following string represents one word in the typical username. For example, in john.doe@somewhere.com, john and doe are words. Basically, a word is either an atom or quoted string. */ var word="(" + atom + "|" + quotedUser + ")" // The following pattern describes the structure of the user var userPat=new RegExp("^" + word + "(\\." + word + ")*$") /* The following pattern describes the structure of a normal symbolic domain, as opposed to ipDomainPat, shown above. */ var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$") /* Finally, let's start trying to figure out if the supplied address is valid. */ /* Begin with the coarse pattern to simply break up user@domain into different pieces that are easy to analyze. */ var matchArray=emailStr.match(emailPat) if (matchArray == null) { /* Too many/few @'s or something; basically, this address doesn't even fit the general mould of a valid e-mail address. */ if (show_alert) alert("Email address seems incorrect (check @ and .'s)") return false } var user=matchArray[1] var domain=matchArray[2] // See if "user" is valid if (user.match(userPat)==null) { // user is not valid if (show_alert) alert("The username doesn't seem to be valid.") return false } /* if the e-mail address is at an IP address (as opposed to a symbolic host name) make sure the IP address is valid. */ var IPArray=domain.match(ipDomainPat) if (IPArray!=null) { // this is an IP address for (var i=1;i<=4;i++) { if (IPArray[i]>255) { if (show_alert) alert("Destination IP address is invalid!") return false } } return true } // Domain is symbolic name var domainArray=domain.match(domainPat) if (domainArray==null) { if (show_alert) alert("The domain name doesn't seem to be valid.") return false } /* domain name seems valid, but now make sure that it ends in a three-letter word (like com, edu, gov) or a two-letter word, representing country (uk, nl), and that there's a hostname preceding the domain or country. */ /* Now we need to break up the domain to get a count of how many atoms it consists of. */ var atomPat=new RegExp(atom,"g") var domArr=domain.match(atomPat) var len=domArr.length if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>3) { // the address must end in a two letter or three letter word. if (show_alert) alert("The address must end in a three-letter domain, or two letter country.") return false } // Make sure there's a host name preceding the domain. if (len<2) { var errStr="This address is missing a hostname!" if (show_alert) alert(errStr) return false } // If we've gotten this far, everything's valid! return true; } // end emailCheck()