The "Noob Link" Technical Reference
Pantz.org Index About Homepage
     _                  ____            _       _
    | | __ ___   ____ _/ ___|  ___ _ __(_)_ __ | |_
 _  | |/ _` \ \ / / _` \___ \ / __| '__| | '_ \| __|
| |_| | (_| |\ V / (_| |___) | (__| |  | | |_) | |_
 \___/ \__,_| \_/ \__,_|____/ \___|_|  |_| .__/ \__|
                                         |_|
                    
Put all of the code examples from the links below between these script tags.
<script language="JavaScript">
<!--

//-->
</script>
E-Mail format checking script.

if (document.formname.fieldname.value.length >0)
{
    i=document.formname.fieldname.value.indexOf("@")
    j=document.formname.fieldname.value.indexOf(".",i)
    k=document.formname.fieldname.value.indexOf(",")
    kk=document.formname.fieldname.value.indexOf(" ")
    jj=document.formname.fieldname.value.lastIndexOf(".")+1
    len=document.formname.fieldname.value.length
    
    if ((i>0) && (j>(1+1)) && (k==-1) && (kk==-1) && (len-jj >=2) && (len-jj<=3))
    {
    }
    else
    {
        alert("Please enter an exact email address.\n" +
        document.formname.fieldname.value + " is invalid.");
        return false;
    }
}
Check if field has special characters.

var iChars = "!@#$%^&*()+=-[]\\\';,./{}|\":><?";

for (var i = 0; i < document.formname.fieldname.value.length; i++)
{
    if (iChars.indexOf(document.formname.fieldname.value.charAt(i)) != -1)
    {
        alert ("Your username has special characters. \nThese are not allowed.\n Please remove them and try again.");
        return false;
    }
}
Check if certian radio buttons have not been selected.

if (!document.formname.fieldname[0].checked &&
    !document.formname.fieldname[1].checked &&
    !document.formname.fieldname[2].checked &&
    !document.formname.fieldname[3].checked)
{
    alert("Please choose a group designation.\n");
    return false;
}
Check if textbox has any characters in it.

if (document.formname.fieldname.value.length == 0)
{
    alert("Please fill out your name.\n");
    return false;
}
Check if multiple checkboxes have not been selected.Replace false with true to see if all are selected.

if (document.formname.fieldname.checked == false &&
    document.formname.fieldname.checked == false &&
    document.formname.fieldname.checked == false)
{
    alert("Please select at least one checkbox.\n");
    return false;
}
Check drop down has been selected. Set drop down's value to Not_Selected for this to work.

if (document.formname.fieldname.value == 'Not_Selected')
{
    alert("Please provide us with a selection.\n");
    return false;
}
Scan values in a field and if they are all letters then alert. The second block of code does the same but for numbers

//alert on finding all letters
var noalpha = /^[a-zA-Z]*$/;
if (noalpha.test(document.formname.fieldname.value))
{
    alert("Please enter at least one number in the \"username\" field.");
    return false;
}

//alert on finding all numbers
var nonums = /^[0-9]*$/;
if (nonums.test(document.formname.fieldname.value))
{
    alert("Please enter at least one letter in the \"username\" field.");
    return false;
}
Remove special characters from a string.

function clearText()
{
    document.formname.fieldname.value=filterNum(document.formname.fieldname.value)
    
    function filterNum(str)
    {
        re = /\$|,|@|#|~|`|\%|\*|\^|\&|\(|\)|\+|\=|\[|\-|\_|\]|\[|\}|\{|\;|\:|\'|\"|\<|\>|\?|\||\\|\!|\$|\./g;
        // remove special characters like "$" and "," etc...
        return str.replace(re, "");
    }
}
Detect special characters in text box. Or any character you subsitute for the special characters.

var iChars = "!@#$%^&*()+=-[]\\\';,./{}|\":<>?";
for (var i = 0; i < document.formname.fieldname.value.length; i++)
{
    if (iChars.indexOf(document.formname.fieldname.value.charAt(i)) != -1)
    {
        alert ("The box has special characters. \nThese are not allowed.\n");
        return false;
    }
}