How to call javascript function in php code?
on my login form, i am putting server side validations and if error occurs i want to display those error just below the validated control. Now for this, i am trying to call javascript function to show validation message in php code but not able to call.
<?php
if($_SERVER['REQUEST_METHOD'] == 'POST')
{
if($_POST['txtUsername']=='')
{
//here i want to call javascript function to display message
}
}
?>
<form action="login.php" method="POST">
Username <input type="text" size="30" name="txtUsername" id="user" /><br />
Password <input type="password" size="30" name="txtPassword" id="pass" /><br />
<input type="submit" value="Login" name="loginSubmit"/>
</form>
<script type="text/javascript">
function showMessage(value)
{
document.getElementById(value).innerHTML= value+"can not be empty.";
}
</script>
Please tell me how to display server side validation just below the validated control in form.
Answer
Something like this
<html>
<head>
<script type="text/javascript">
function showMessage(value)
{
document.getElementById(value).innerHTML= value+"can not be empty.";
}
</script>
</head>
<body>
<?php
if($_SERVER['REQUEST_METHOD'] == 'POST')
{
if($_POST['txtUsername']=='')
{
echo '<script> showMessage("txtUsername"); </script>';
}
}
?>
<form action="login.php" method="POST">
Username <input type="text" size="30" name="txtUsername" id="txtUsername" /><br />
Password <input type="password" size="30" name="txtPassword" id="txtPassword" /><br />
<input type="submit" value="Login" name="loginSubmit"/>
</form>
</body>
</html>