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Thread: Trouble with validation

  1. #1
    Join Date
    May 2008
    Posts
    3

    Trouble with validation

    As of now, I am validating my fields to just check if the field was filled in. Now I want to validate the entries further. For name- only alpha characters, zip-only numerical characters, ect. I know I'm going to have to use regular expressions, but as I'm new to regular expressions, I don't know how to insert it into my existing validation, any help would be appreciated.

    Snippets of my current code:

    <script type="text/javascript">

    <!--

    function validate_form()
    {
    valid = true;
    if (document.form.name.value == '')
    {
    alert ( "please enter your name." );
    valid = false;
    }

    return valid;
    }
    //-->
    </script>

    <!-- Text widgets for the customers name and address -->

    <tr>
    <td> Buyers Name: </td>
    <td> <input type = "text" name = "name"
    size = "30" onblur="validate_form()"
    /></td>


    Again, any help would be awesome

  2. #2
    Join Date
    May 2008
    Posts
    3
    bump, help please

  3. #3
    Join Date
    May 2008
    Posts
    21
    Is this what you mean?

    function lettersOnly(evt) {
    evt = (evt) ? evt : event;
    var charCode = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode :
    ((evt.which) ? evt.which : 0));
    if (charCode > 31 && (charCode < 65 || charCode > 90) &&
    (charCode < 97 || charCode > 122)) {
    alert("Enter letters only.");
    return false;
    }
    return true;
    }

  4. #4
    Join Date
    May 2008
    Posts
    1
    Here's a code that i've used many times and altered when needed. Hope it helps:

    function checkForm(form) {
    if(checkpmbzip(form.pmbzip)==false){
    alert("Please Include a Valid Zip Code.");
    form.pmbzip.focus();
    return false;
    } else if (checkpmbzip4(form.pmbzip4)==false) {
    alert("Please Include a Valid Zip Plus 4.");
    form.pmbzip4.focus();
    return false;
    } else if (checkpharea(form.pharea)==false) {
    alert("Please check the phone number area code.");
    form.pharea.focus();
    return false;
    } else if (checkphprefix(form.phprefix)==false) {
    alert("Please check the phone number Pre Fix.");
    form.phprefix.focus();
    return false;
    } else if (checkphnum(form.phnum)==false) {
    alert("Please check the phone number suffix.");
    form.phnum.focus();
    return false;
    } else {
    return true;
    }
    }

    function checkpmbzip(pmbzip){

    var numstr=pmbzip.value+"";
    if(numstr=="" || numstr.length!=5){
    return false;
    }else{
    var i;
    for(i=0;i<numstr.length;i++){
    if(numstr.charAt(i)<"0" || numstr.charAt(i)>"9"){
    return false;
    }
    }
    }
    return true;
    }
    function checkpmbzip4(pmbzip4){

    var numstr=pmbzip4.value+"";
    if(numstr=="" || numstr.length!=4){
    return false;
    }else{
    var i;
    for(i=0;i<numstr.length;i++){
    if(numstr.charAt(i)<"0" || numstr.charAt(i)>"9"){
    return false;
    }
    }
    }
    return true;
    }
    function checkpharea(pharea){

    var numstr=pharea.value+"";
    if(numstr=="" || numstr.length!=3){
    return false;
    }else{
    var i;
    for(i=0;i<numstr.length;i++){
    if(numstr.charAt(i)<"0" || numstr.charAt(i)>"9"){
    return false;
    }
    }
    }
    return true;
    }
    function checkphprefix(phprefix){

    var numstr=phprefix.value+"";
    if(numstr=="" || numstr.length!=3){
    return false;
    }else{
    var i;
    for(i=0;i<numstr.length;i++){
    if(numstr.charAt(i)<"0" || numstr.charAt(i)>"9"){
    return false;
    }
    }
    }
    return true;
    }
    function checkphnum(phnum){

    var numstr=phnum.value+"";
    if(numstr=="" || numstr.length!=4){
    return false;
    }else{
    var i;
    for(i=0;i<numstr.length;i++){
    if(numstr.charAt(i)<"0" || numstr.charAt(i)>"9"){
    return false;
    }
    }
    }
    return true;
    }

    I call the function here:
    <FORM NAME="myform" onSubmit="return checkForm(document.myform)" METHOD="POST">

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