/* ***** * Form and Email Validation * * @author Sean Unwin stunwin {AT} yahoo {DOT} com * @orig_copywrite July 24, 2009 * @copywrite July 29, 2009 * @version 1.3 ***** */ // Check the form was filled out correctly // @frm html form name //@emID html div id for error message display function validateForm(frm,emID) { // create form variables var fn=document.forms[frm].txtFName.value; var ln=document.forms[frm].txtLName.value; var em1=document.forms[frm].txtEmail1.value; var em2=document.forms[frm].txtEmail2.value; // array to hold error types var errArr = new Array(); // first name field is empty if (fn=="") {errArr.push(0);} // last name field is empty if (ln=="") {errArr.push(1);} // email field is empty if (em1=="") {errArr.push(2);} // email confirmation field is empty if (em2=="") {errArr.push(3);} // email fields don't match if (em1!="" && em2!="") { if (em1!=em2) {errArr.push(4);} } // fields are filled correctly so check for legitimate syntax if (errArr.length==0) { var v = mailCheck(em2); if(v==true){errArr.push(5);} } // call to display error message reportBack(errArr,emID,frm); // do not send the form return false; } // Check for correct syntax of email address // @str email address function mailCheck(str) { // remove leading and trailing white spaces from email string str=str.replace(/^\s*/, '').replace(/\s*$/, ''); // 'at' symbol var at="@"; // location of '@' within email string var at_loc=str.indexOf(at); // string of local part of email var lp = str.substring(0,(at_loc)) // boolean for local part character verification var lp_vct; // string of domain (hostname) of email var dp = str.substring((at_loc+1),str.length); // boolean for local part character verification var dp_vct; var dotRetVal1; var dotRetVal2; // error boolean (only require 1 error type for this function) var e=false; // set boolean by calling character verification for local part lp_vct=verifyEmailChars(lp,"lp"); // check if invalid character is used if(lp_vct==false){ e=true; return e; } // perform dot check on local part dotRetVal1 = dotCheck(lp,0); if(dotRetVal1==true){ e=true; return e; } // set boolean by calling character verification for domain part dp_vct=verifyEmailChars(dp,"dp"); // check if invalid character is used if(dp_vct==false){ e=true; return e; } // perform dot check on domain part dotRetVal2 = dotCheck(dp,1); if(dotRetVal2==true){ e= true; return e; } // check if there is text before the '@' if(lp.length==undefined){ e=true; return e; } // no errors - returns false return e; } // Create and display error message if form was filled incorrectly // @ea error message array containing error codes // @eid html div id for error message display // @f html form name function reportBack(ea,eid,f) { // redirect url if no errors were found // append the value of requested contact checkbox var npg="emailconfirm.php" + "?c=" + document.frmEmailReq.chkContactReq.checked; // string to hold error message var msg=""; // string for html line break to be included in returned error message var b="
"; // array for error types is not empty if (ea.length!=undefined && ea.length>0) { var item; // cycle through each error type in array for (var n in ea) { item = ea[n]; switch (item) { // first name field is empty case 0: msg+="** Please enter your first name. **"; msg+=b; break; // last name field is empty case 1: msg+="** Please enter your last name. **"; msg+=b; break; // email field is empty case 2: msg+="** Please enter your email address. **"; msg+=b; break; // email confirmation field is empty case 3: msg+="** Please confirm your email address. **"; msg+=b; break; // email fields don't match case 4: msg+="** Your email address does NOT match. **"; msg+=b; break; // email is not in legitimate format case 5: msg+="** Invalid syntax for email address. **" msg+=b; break; } } // display error message document.getElementById(eid).innerHTML = msg; } else { /* // no errors so go to next page window.location.href=npg; */ // process the form document.forms[f].submit(); } } // Validate characters in an email string // @s string to validate // @pt string identifying local part (value = lp) or domain part (value = dp) of email address function verifyEmailChars(s,pt){ // RegExp string to check for invalid characters (LOCAL PART ONLY) // valid characters for local part are -- a-z A-Z 0-9 ! # $ % & ' * + - / = ? ^ _ ` { | } ~ var lp_isc = /[\w\.!#$%&'*+\-\/=?^_`\{\|\}~]/; // RegExp string to check for invalid characters (DOMAIN PART ONLY) // valid characters for domain part are -- a-z A-Z 0-9 ! # $ % & ' * + - / = ? ^ _ ` { | } ~ var dp_isc = /[\w\.\-]/; // test valid character depending which part is being called var test = (pt=="pt")?lp_isc.test(s):dp_isc.test(s); // return the result return test; } // Check that dot is within legitimate bounds // @stc string to check // @t type of string (local part = 0, domain part = 1) function dotCheck(stc,t){ // dot symbol var dot="."; // array to hold each instance of a dot var dotArr = new Array(); // error boolean value var err; // place all local part locations of instances of '.' in an array for(var c in stc) { if(stc.charAt(c)==dot){dotArr.push(c);} } // check to see if there is a '.' at the begining, end or 2 consecutively if(dotArr.length==0 && t==1){ err=true; return err; } if(dotArr.length!=undefined){ var y; var py; // loop through the array for(var x in dotArr){ y=dotArr[x]; // check if dot is at beginning or end of string if(y==0 || y==(stc.length-1)){ // error found err=true; return err; } // string is for domain part if(t==1){ // domain suffix has to be within 2-4 characters in length if((y==1) || (y==(stc.length-2)) || (y<(stc.length-5))){ err=true; return err; } } // check for consecutive dots in the string if(y==(py+1)){ // error found err=true; return err; } // make py a number py=parseInt(y); } } }