How could I validate a form, but have it return to the same form on action is there was an error? Very newbie question
Here's my registerFormOne.php code:
<?php session_start();
require("validationLibrary.php");
$validForm = true;
?>
<html>
<head>
<title>Regist开发者_如何学Goration Form - 1 of 2</title>
</head>
<body>
<h1>Registration - Part 1 of 2</h1>
<p>Please fill in all the required information before submitting the information.</p>
<form action="registerFormTwo.php" method="post">
<dt>First Name:</dt>
<dd><input type="text" name="firstName" /></dd><br />
<dd>
<?php
if(isset($_POST['firstName'])){
if(!validateRequired($_POST['firstName'])){
$validForm = false;
}
}
?>
</dd><br />
<dt>Last Name:</dt>
<dd><input type="text" name="lastName" /></dd><br />
<dd>
<?php
if(isset($_POST['lastName'])){
if(!validateRequired($_POST['lastName'])){
$validForm = false;
}
}
?>
</dd><br />
<dt>EMail:</dt>
<dd><input type="text" name="email" /></dd><br />
<dd>
<?php
if(isset($_POST['email'])){
if(!validateEmail($_POST['email'])){
$validForm = false;
}
}
?>
</dd><br />
<dt>Age:</dt>
<dd><input type="text" name="age" /></dd><br />
<dd>
<?php
if(isset($_POST['age'])){
if(!validateNumber($_POST['age'])){
$validForm = false;
}
}
?>
</dd><br />
<dt>Date of Birth:</dt>
<dd><input type="text" name="dateOfBirth" /></dd><br />
<dd>
<?php
if(isset($_POST['dateOfBirth'])){
if(!validateRequired($_POST['dateOfBirth'])){
$validForm = false;
}
}
?>
</dd><br />
<dt>Gender:</dt>
<dd>Masculino <input type="radio" value="M" name="gender" checked/>
Femenino <input type="radio" value="F" name="gender" />
</dd>
<dt><input type="submit" /></dt>
</form>
</body>
</html>
And here's my validationLibrary.php which I use as a class:
<?php
function validateRequired($field){
if($field == ""){
echo "Information for this field is required.";
return false;
}
else{
return true;
}
}
function validateNumber($field){
if(!is_numeric($field)){
echo "Only numeric values are allowed in this field.";
return false;
}
else{
return true;
}
}
function validateEmail($field){
$regexp = "/^[_\.0-9a-zA-Z-]+@([0-9a-zA-Z-][0-9a-zA-Z-]+\.)+[a-zA-Z](2,6)$/";
if(!preg_match($regexp,$field)){
echo "Please type in a valid email address.";
return false;
}
else{
return true;
}
}
?>
I need to have the formOne reload again, and NOT go to the formTwo if the variable $validForm is false.
I have on idea how to do this. Thank you very much for your help. :)
Change the action attribute of the form to submit to itself, not form #2. Only if your validation code passes do you redirect to form #2 with a location header().
For you, as a beginner developer, it would be so much easier to use ValidForm Builder. Check http://validformbuilder.org
It's an open source Form building tool with all these features you're mentioning and a lot more.
This is not meant as a commercial (since it's a free to use open source package), just a handy tip.
Dunno what's the "best" way to do so, but what I do is make a form's action return to the same page, then check form input before I put any content on the page -- if there's something wrong, I do nothing, and I can prefill the values with $_POST values -- if nothing's wrong, I use header('Location: formTwo.php') to continue :) you can pass on the variables if after changing the header you reassign the variables.
Something like this:
<?php
$errors = array();
if (isset($_POST['submit']))
{
// validate and possibly populate the $errors array
if (empty($errors))
{
// do something with the data
header('Location: target.php');
exit;
}
}
?>
<html>
<?php if (!empty($errors)) : ?> <?php echo implode(', ', $errors) ?>
<?php endif; ?>
<form>
<!-- fill form elements with values if they are set -->
...
</form>
</html>
Are you opposed to using javascript for form validation? If not it will save a trip to the server and back, and the problem of reserving the form's page is avoided.
加载中,请稍侯......
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