Require a field in a form

[Futurama56]

How can I require the First and Last name fields?

<?php 
if (!$Submit){ ?> 
<span class="CenterHeader style2"><font face=Arial><b>Fill out the form below</b></font></span><br> 
<form method="post" action="<?php echo $PHP_SELF; ?>"> 
  <div align="left"> 
    <p></p> 
    <table width="718" border="1"> 
      <tr> 
        <td>First Name:</td> 
        <td><input type="text" name="FName"></td> 
      </tr> 
      <tr> 
        <td>Last Name: </td> 
        <td><input type="text" name="LName"></td> 
      </tr> 
      <tr> 
        <td>Title:</td> 
        <td><input type="text" name="Title" size="60"></td> 
      </tr> 
      <tr> 
        <td>E-Mail:</td> 
        <td><input type="text" name="Email" size="60"></td> 
      </tr> 
      <tr> 
        <td>Product/Franchise:</td> 
        <td>          <select size="1" name="Product"> 
            <option>Clinical 
            <option>Clinical Communications 
            <option>IT (e-business, solutions) 
            <option>Legal 
            <option>Marketing 
            <option>Medical Affairs 
            <option>Medical Education 
            <option>Public Relations 
            <option>Sales 
            <option>Other 
          </select> 

    </td> 
  </tr> 
  <tr> 
    <td>Department:</td> 
    <td><input type="text" name="Department" size="60"></td> 
  </tr> 
  <tr> 
    <td>Company</td> 
    <td><input type="text" name="Company" size="60"></td> 
  </tr> 
</table> 
<p> 
  <input type="Submit" name="Submit" value="Submit"> 
</p> 
  </div> 
</form> 
<?php 
} else { 
$Line1="$Name sent the following message:"; 
mail("[e-mail]","$Sbjct","$Line1\nFName: $FName\nLName: $LName\nTitle: $Title\nEmail: $Email\nProduct: $Product\nDepartment: $Department\nCompany: $Company\n$Message","From: $Email"); 
print "<font face=Arial size=4>WE WILL GET BACK TO YOU</font><hr width=360 align=left>"; 
print "<a href=\"\"></a></font>"; 
} ?> 

[LordShryku]

Just check if it's [man]empty[/man] or not after the form is submitted.
If it's empty, error, return to the form. Otherwise, it's fine, process it.

[MattLarson29]

You could also validate the form with some Javascript and display an error dialog if the fields are empty.

Otherwise, validate your input in the handling script:

if (empty($Fname)) {
die("First name not provided. Please use the
BACK button on your browser and enter
your first name on the form");
}

Matt

[fr0stx]

if (empty($_POST['user'])) { 
echo "USER USER BAH!!!<br>"; 
}

:p

[LordShryku]

Originally posted by MattLarson29
You could also validate the form with some Javascript and display an error dialog if the fields are empty.

A combination of both isn't a bad idea, but never rely completely on Javascript, considering the user can turn it off.

[MattLarson29]

Good point. If you elect to validate using Javascript, always back that up by checking the data in the handler script in PHP.

Matt

[jakko100]

I would use this code:

<?

$length_of_name = strlen($_POST["name"]);

if (empty($_POST["name"])) {

 echo "You must insert your name!";

} elseif ($length_of_name < 3) {

 echo "Name must be longer than 2 characters!";

} else {

 echo "All data successfully inserted!";

}

?>