Problems With Dynamic Form Using JavaScript and PHP
I'm having trouble with these files, see if you guys can help me out :) I get an object required error..
index.php
<?php
//Start session
session_start();
//Require functions.php
require("functions.php");
//Require posts.php
require("posts.php");
?>
<html>
<body>
<title>Log Into Booking System</title>
<?php
//Call function to display login
displayLogin();
?>
</body>
</html>
posts.php
<?php
if (isset($_POST['sublogin']))
{
//Check that all fields were typed in and are not null
if(!$_POST['user'] || !$_POST['pass'])
{
//Call function to display error
printText("Please make sure all required fields are filled in.");
}
else
{
//Here is some database checking
}
}
?>
functions.php
<?php
function displayLogin()
{
//Break php, then return to PHP
?>
<h1>Login</h1>
<form action="" method="post">
<table align="left" border="0" cellspacing="0" cellpadding="3">
<tr><td>Username:</td><td><input type="text" name="user" maxlength="30"></td></tr>
<tr><td>Password:</td><td><input type="password" name="pass" maxlength="30"></td></tr>
<tr><td><div id='error'></div></td></tr>
<tr><td colspan="2" align="right"><input type="submit" name="sublogin" value="Login"></td></tr>
</table>
</form>
<?
}
function printText($txtmsg)
{
?>
<!-- Set up the displayError javascript function -->
<script type="text/javascript">
function displayError()
{
document.getElementById('error').innerHTML = <?echo $txtmsg;?>;
}
</script>
<!-- Call function to Display the error -->
<script type="text/javascript">
displayError();
</script>
<?
}
?>
I'm pretty sure
document.getElementById('error').innerHTML
Is causing me problems, i think it might have to do with how im calling it, like it dosent know what its looking for..
Thanks guys mu开发者_如何学编程ch appreciated,
Jenny
EDIT: Here is the paste of what jQuerybeast tried to do, http://pastebin.com/jj0RVMAd
SOLUTION: Who knew it was this easy? You MUST change the order of where posts.php is required as well as make sure you don't call a javascript function within functions.php because that will execute the javascript above the form and therefore giving a null object error.
Index.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Log Into Booking System</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<?php
//Start session
session_start();
//Require functions.php
require("functions.php");
?>
</head>
<body>
<?php
//Call function to display login
displayLogin();
//Require posts.php
require("posts.php");
?>
</body>
</html>
posts.php
<?php
//POST: Main login page
if (isset($_POST['sublogin']))
{
//Display error if feilds are not filled in
if(!$_POST['user'] || !$_POST['pass'])
{
echo '<script type="text/javascript">document.getElementById("error").innerHTML = "Please make sure all required fields are filled in.";</script>';
return false;
}
else
{
//Some database minipulation here....
//...
if ($_POST['user'] != $databaseUsername)
{
echo '<script type="text/javascript">document.getElementById("error").innerHTML = "Please make sure your username is correct.";</script>';
return false;
}
elseif($_POST['pass'] != $databasePassword)
{
echo '<script type="text/javascript">document.getElementById("error").innerHTML = "Please make sure your password is correct.";</script>';
return false;
}
}
return true;
}
?>
functions.php
<?php
//Function: Display main.php login
function displayLogin()
{
//Break php, then return to PHP
?>
<div style="float: left; padding: 10px; width:20%;">
<fieldset>
<legend>
<h1>Login</h1>
</legend>
<form name = "mainlogin" action="" method="post">
<table align="left" border="0" cellspacing="0" cellpadding="3">
<tr><td>Username:</td><td><input type="text" name="user" maxlength="30"></td></tr>
<tr><td>Password:</td><td><input type="password" name="pass" maxlength="30"></td></tr>
<tr><td colspan="2" align="left"><input type="checkbox" name="remember">
<font size="2">Remember username and password</td></tr>
<tr><td><div id="error"></div></tr><td>
<tr><td colspan="2" align="right"><input type="submit" name="sublogin" value="Login"></td></tr>
</table>
</form>
</fieldset>
</div>
<?php
}
?>
The first thing I notice is that the PHP-echoed string inside the Javascript function doesn't have quotation marks around it.
Change:
function displayError()
{
document.getElementById('error').innerHTML = <?echo $txtmsg;?>;
}
To:
function displayError()
{
document.getElementById('error').innerHTML = "<?echo $txtmsg;?>";
}
I think the problem is caused from functions.php is because you open and close PHP the opposite way.
Instead of ?> <?
Try: <? ?>
Which is this:
function displayLogin()
{
//Break php, then return to PHP
<?
<h1>Login</h1>
<form action="" method="post">
<table align="left" border="0" cellspacing="0" cellpadding="3">
<tr><td>Username:</td><td><input type="text" name="user" maxlength="30"></td></tr>
<tr><td>Password:</td><td><input type="password" name="pass" maxlength="30"></td></tr>
<tr><td><div id='error'></div></td></tr>
<tr><td colspan="2" align="right"><input type="submit" name="sublogin" value="Login"></td></tr>
</table>
</form>
?>
}
function printText($txtmsg)
{
<?
<!-- Set up the displayError javascript function -->
<script type="text/javascript">
function displayError()
{
document.getElementById('error').innerHTML = <?echo $txtmsg;?>;
}
</script>
<!-- Call function to Display the error -->
<script type="text/javascript">
displayError();
</script>
?>
}
change
document.getElementById('error').innerHTML = <?echo $txtmsg;?>;
to
document.getElementById('error').innerHTML = '<?= $txtmsg; ?>';
or
document.getElementById('error').innerHTML = '<?php echo $txtmsg; ?>';
Use this
document.getElementById('error').innerHTML = '<?php echo $txtmsg; ?>';
and
It seems short tag is not enabled on your server. Please make sure.
Or always use <?php ?> instead of <? ?>
加载中,请稍侯......
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