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Formuláře - kontrola vyplnění polí
Nová položka
Zobrazeno: 7714

Popis: KOntroluje každé textové pole, zda bylo vyplněno.
Funkčnost: Všude
Hodnocení: *
Ukázka

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script language="JavaScript">
<!--
// This script was found at the JavaScript Place. http://www.javaplace.co.uk
function validate_form() {
  validity = true; // assume valid
  if (!check_empty(document.form.NAME.value))
        { validity = false; alert('Name field is empty!'); }
  if (!check_email(document.form.EMAIL.value))
        { validity = false; alert('Email address is invalid!'); }
  if (!check_url(document.form.URL.value))
        { validity = false; alert('URL field is invalid!'); }
  if (!check_empty(document.form.DESCRIPTION.value))
        { validity = false; alert('Description field is empty!'); }
  if (validity)
        alert ("Needed entries have been verified. "
                + "Your form is now being passed to your browser's "
                + "Mail Delivery Sub-System.");
  return validity;
}

function check_empty(text) {
  return (text.length > 0); // returns false if empty
}

function check_email(address) {
  if ((address == "")
    || (address.indexOf ('@') == -1)
    || (address.indexOf ('.') == -1))
      return false;
  return true;
}

function check_url(address) {
  if ((address == "")
    || (address.indexOf ('http://') == -1)
    || (address.indexOf ('.') == -1))
      return false;
  return true;
}
// -->
</script>

</head>

<body>
<form name="form" method="post" action="YOUR EMAIL ADDRESS ?SUBJECT=YOUR SUBJECT"
 enctype="text/plain" onSubmit="return validate_form()">
Name:<br><input type="text" size=50 name="NAME"><br>
Email:<br><input type="text" size=50 name="EMAIL"><br>
URL:<br><input type="text" size=50 name="URL"><br>
Description:<br><TEXTAREA NAME="DESCRIPTION" ROWS=8 COLS=50 wrap=virtual>