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<h1>Form Validation</h1> | |
<p>Before explaining CodeIgniter's approach to data validation, let's describe the ideal scenario:</p> | |
<ol> | |
<li>A form is displayed.</li> | |
<li>You fill it in and submit it.</li> | |
<li>If you submitted something invalid, or perhaps missed a required item, the form is redisplayed containing your data along with an error message describing the problem.</li> | |
<li>This process continues until you have submitted a valid form.</li> | |
</ol> | |
<p>On the receiving end, the script must:</p> | |
<ol> | |
<li>Check for required data.</li> | |
<li>Verify that the data is of the correct type, and meets the correct criteria. (For example, if a username is submitted | |
it must be validated to contain only permitted characters. It must be of a minimum length, | |
and not exceed a maximum length. The username can't be someone else's existing username, or perhaps even a reserved word. Etc.)</li> | |
<li>Sanitize the data for security.</li> | |
<li>Pre-format the data if needed (Does the data need to be trimmed? HTML encoded? Etc.)</li> | |
<li>Prep the data for insertion in the database.</li> | |
</ol> | |
<p>Although there is nothing complex about the above process, it usually requires a significant | |
amount of code, and to display error messages, various control structures are usually placed within the form HTML. | |
Form validation, while simple to create, is generally very messy and tedious to implement.</p> | |
<dfn>CodeIgniter provides a comprehensive validation framework that truly minimizes the amount of code you'll write. | |
It also removes all control structures from your form HTML, permitting it to be clean and free of code.</dfn> | |
<h2>Overview</h2> | |
<p>In order to implement CodeIgniter's form validation you'll need three things:</p> | |
<ol> | |
<li>A <a href="../general/views.html">View</a> file containing the form.</li> | |
<li>A View file containing a "success" message to be displayed upon successful submission.</li> | |
<li>A <a href="../general/controllers.html">controller</a> function to receive and process the submitted data.</li> | |
</ol> | |
<p>Let's create those three things, using a member sign-up form as the example.</p> | |
<h2>The Form</h2> | |
<p>Using a text editor, create a form called <dfn>myform.php</dfn>. In it, place this code and save it to your <samp>applications/views/</samp> | |
folder:</p> | |
<textarea class="textarea" style="width:100%" cols="50" rows="30"><html> | |
<head> | |
<title>My Form</title> | |
</head> | |
<body> | |
<?=$this->validation->error_string; ?> | |
<?=form_open('form'); ?> | |
<h5>Username</h5> | |
<input type="text" name="username" value="" size="50" /> | |
<h5>Password</h5> | |
<input type="text" name="password" value="" size="50" /> | |
<h5>Password Confirm</h5> | |
<input type="text" name="passconf" value="" size="50" /> | |
<h5>Email Address</h5> | |
<input type="text" name="email" value="" size="50" /> | |
<div><input type="submit" value="Submit" /></div> | |
</form> | |
</body> | |
</html> | |
</textarea> | |
<h2>The Success Page</h2> | |
<p>Using a text editor, create a form called <dfn>formsuccess.php</dfn>. In it, place this code and save it to your <samp>applications/views/</samp> | |
folder:</p> | |
<textarea class="textarea" style="width:100%" cols="50" rows="14"> | |
<html> | |
<head> | |
<title>My Form</title> | |
</head> | |
<body> | |
<h3>Your form was successfully submitted!</h3> | |
<p><?=anchor('form', 'Try it again!'); ?></p> | |
</body> | |
</html> | |
</textarea> | |
<h2>The Controller</h2> | |
<p>Using a text editor, create a controller called <dfn>form.php</dfn>. In it, place this code and save it to your <samp>applications/controllers/</samp> | |
folder:</p> | |
<textarea class="textarea" style="width:100%" cols="50" rows="21"><?php | |
class Form extends Controller { | |
function index() | |
{ | |
$this->load->helper(array('form', 'url')); | |
$this->load->library('validation'); | |
if ($this->validation->run() == FALSE) | |
{ | |
$this->load->view('myform'); | |
} | |
else | |
{ | |
$this->load->view('formsuccess'); | |
} | |
} | |
} | |
?></textarea> | |
<h2>Try it!</h2> | |
<p>To try your form, visit your site using a URL similar to this one:</p> | |
<code>www.your-site.com/index.php/<var>form</var>/</code> | |
<p><strong>If you submit the form you should simply see the form reload. That's because you haven't set up any validation | |
rules yet, which we'll get to in a moment.</strong></p> | |
<h2>Explanation</h2> | |
<p>You'll notice several things about the above pages:</p> | |
<p>The <dfn>form</dfn> (myform.php) is a standard web form with a couple exceptions:</p> | |
<ol> | |
<li>It uses a <dfn>form helper</dfn> to create the form opening. | |
Technically, this isn't necessary. You could create the form using standard HTML. However, the benefit of using the helper | |
is that it generates the action URL for you, based on the URL in your config file. This makes your application more portable | |
and flexible in the event your URLs change.</li> | |
<li>At the top of the form you'll notice the following variable: | |
<code><?=$this->validation->error_string; ?></code> | |
<p>This variable will display any error messages sent back by the validator. If there are no messages it returns nothing.</p> | |
</li> | |
</ol> | |
<p>The <dfn>controller</dfn> (form.php) has one function: <dfn>index()</dfn>. This function initializes the validation class and | |
loads the <var>form helper</var> and <var>URL helper</var> used by your view files. It also <samp>runs</samp> | |
the validation routine. Based on | |
whether the validation was successful it either presents the form or the success page.</p> | |
<p><strong>Since you haven't told the validation class to validate anything yet, it returns "false" (boolean false) by default. The <samp>run()</samp> | |
function only returns "true" if it has successfully applied your rules without any of them failing.</strong></p> | |
<h2>Setting Validation Rules</h2> | |
<p>CodeIgniter lets you set as many validation rules as you need for a given field, cascading them in order, and it even lets you prep and pre-process the field data | |
at the same time. Let's see it in action, we'll explain it afterwards.</p> | |
<p>In your <dfn>controller</dfn> (form.php), add this code just below the validation initialization function:</p> | |
<code>$rules['username'] = "required";<br /> | |
$rules['password'] = "required";<br /> | |
$rules['passconf'] = "required";<br /> | |
$rules['email'] = "required";<br /> | |
<br /> | |
$this->validation->set_rules($rules);</code> | |
<p>Your controller should now look like this:</p> | |
<textarea class="textarea" style="width:100%" cols="50" rows="28"><?php | |
class Form extends Controller { | |
function index() | |
{ | |
$this->load->helper(array('form', 'url')); | |
$this->load->library('validation'); | |
$rules['username'] = "required"; | |
$rules['password'] = "required"; | |
$rules['passconf'] = "required"; | |
$rules['email'] = "required"; | |
$this->validation->set_rules($rules); | |
if ($this->validation->run() == FALSE) | |
{ | |
$this->load->view('myform'); | |
} | |
else | |
{ | |
$this->load->view('formsuccess'); | |
} | |
} | |
} | |
?></textarea> | |
<p><dfn>Now submit the form with the fields blank and you should see the error message. | |
If you submit the form with all the fields populated you'll see your success page.</dfn></p> | |
<p class="important"><strong>Note:</strong> The form fields are not yet being re-populated with the data when | |
there is an error. We'll get to that shortly, once we're through explaining the validation rules.</p> | |
<h2>Changing the Error Delimiters</h2> | |
<p>By default, the system adds a paragraph tag (<p>) around each error message shown. You can easily change these delimiters with | |
this code, placed in your controller:</p> | |
<code>$this->validation->set_error_delimiters('<kbd><div class="error"></kbd>', '<kbd></div></kbd>');</code> | |
<p>In this example, we've switched to using div tags.</p> | |
<h2>Cascading Rules</h2> | |
<p>CodeIgniter lets you pipe multiple rules together. Let's try it. Change your rules array like this:</p> | |
<code>$rules['username'] = "required|min_length[5]|max_length[12]";<br /> | |
$rules['password'] = "required|matches[passconf]";<br /> | |
$rules['passconf'] = "required";<br /> | |
$rules['email'] = "required|valid_email";</code> | |
<p>The above code requires that:</p> | |
<ol> | |
<li>The username field be no shorter than 5 characters and no longer than 12.</li> | |
<li>The password field must match the password confirmation field.</li> | |
<li>The email field must contain a valid email address.</li> | |
</ol> | |
<p>Give it a try!</p> | |
<p class="important"><strong>Note:</strong> There are numerous rules available which you can read about in the validation reference.</p> | |
<h2>Prepping Data</h2> | |
<p>In addition to the validation functions like the ones we used above, you can also prep your data in various ways. | |
For example, you can set up rules like this:</p> | |
<code>$rules['username'] = "<kbd>trim</kbd>|required|min_length[5]|max_length[12]|<kbd>xss_clean</kbd>";<br /> | |
$rules['password'] = "<kbd>trim</kbd>|required|matches[passconf]|<kbd>md5</kbd>";<br /> | |
$rules['passconf'] = "<kbd>trim</kbd>|required";<br /> | |
$rules['email'] = "<kbd>trim</kbd>|required|valid_email";</code> | |
<p>In the above, we are "trimming" the fields, converting the password to MD5, and running the username through | |
the "xss_clean" function, which removes malicious data.</p> | |
<p class="important"><strong>Any native PHP function that accepts one parameter can be used as a rule, like <dfn>htmlspecialchars</dfn>, | |
<dfn>trim</dfn>, <dfn>MD5</dfn>, etc.</strong></p> | |
<p><strong>Note:</strong> You will generally want to use the prepping functions <strong>after</strong> | |
the validation rules so if there is an error, the original data will be shown in the form.</p> | |
<h2>Callbacks: Your own Validation Functions</h2> | |
<p>The validation system supports callbacks to your own validation functions. This permits you to extend the validation class | |
to meet your needs. For example, if you need to run a database query to see if the user is choosing a unique username, you can | |
create a callback function that does that. Let's create a simple example.</p> | |
<p>In your controller, change the "username" rule to this:</p> | |
<code>$rules['username'] = "callback_username_check"; </code> | |
<p>Then add a new function called <dfn>username_check</dfn> to your controller. Here's how your controller should look:</p> | |
<textarea class="textarea" style="width:100%" cols="50" rows="44"><?php | |
class Form extends Controller { | |
function index() | |
{ | |
$this->load->helper(array('form', 'url')); | |
$this->load->library('validation'); | |
$rules['username'] = "callback_username_check"; | |
$rules['password'] = "required"; | |
$rules['passconf'] = "required"; | |
$rules['email'] = "required"; | |
$this->validation->set_rules($rules); | |
if ($this->validation->run() == FALSE) | |
{ | |
$this->load->view('myform'); | |
} | |
else | |
{ | |
$this->load->view('formsuccess'); | |
} | |
} | |
function username_check($str) | |
{ | |
if ($str == 'test') | |
{ | |
$this->validation->set_message('username_check', 'The %s field can not be the word "test"'); | |
return FALSE; | |
} | |
else | |
{ | |
return TRUE; | |
} | |
} | |
} | |
?></textarea> | |
<p>Reload your form and submit it with the word "test" as the username. You can see that the form field data was passed to your | |
callback function for you to process.</p> | |
<p><strong>To invoke a callback just put the function name in a rule, with "callback_" as the rule prefix.</strong></p> | |
<p>The error message was set using the <dfn>$this->validation->set_message</dfn> function. | |
Just remember that the message key (the first parameter) must match your function name.</p> | |
<p class="important"><strong>Note:</strong> You can apply your own custom error messages to any rule, just by setting the | |
message similarly. For example, to change the message for the "required" rule you will do this:</p> | |
<code>$this->validation->set_message('required', 'Your custom message here');</code> | |
<h2>Re-populating the form</h2> | |
<p>Thus far we have only been dealing with errors. It's time to repopulate the form field with the submitted data. | |
This is done similarly to your rules. Add the following code to your controller, just below your rules:</p> | |
<code>$fields['username'] = 'Username';<br /> | |
$fields['password'] = 'Password';<br /> | |
$fields['passconf'] = 'Password Confirmation';<br /> | |
$fields['email'] = 'Email Address';<br /> | |
<br /> | |
$this->validation->set_fields($fields);</code> | |
<p>The array keys are the actual names of the form fields, the value represents the full name that you want shown in the | |
error message.</p> | |
<p>The index function of your controller should now look like this:</p> | |
<textarea class="textarea" style="width:100%" cols="50" rows="30">function index() | |
{ | |
$this->load->helper(array('form', 'url')); | |
$this->load->library('validation'); | |
$rules['username'] = "required"; | |
$rules['password'] = "required"; | |
$rules['passconf'] = "required"; | |
$rules['email'] = "required"; | |
$this->validation->set_rules($rules); | |
$fields['username'] = 'Username'; | |
$fields['password'] = 'Password'; | |
$fields['passconf'] = 'Password Confirmation'; | |
$fields['email'] = 'Email Address'; | |
$this->validation->set_fields($fields); | |
if ($this->validation->run() == FALSE) | |
{ | |
$this->load->view('myform'); | |
} | |
else | |
{ | |
$this->load->view('formsuccess'); | |
} | |
}</textarea> | |
<p>Now open your <dfn>myform.php</dfn> view file and update the value in each field so that it has an object corresponding to its name:</p> | |
<textarea class="textarea" style="width:100%" cols="50" rows="30"> | |
<html> | |
<head> | |
<title>My Form</title> | |
</head> | |
<body> | |
<?=$this->validation->error_string; ?> | |
<?=form_open('form'); ?> | |
<h5>Username</h5> | |
<input type="text" name="username" value="<?=$this->validation->username;?>" size="50" /> | |
<h5>Password</h5> | |
<input type="text" name="password" value="<?=$this->validation->password;?>" size="50" /> | |
<h5>Password Confirm</h5> | |
<input type="text" name="passconf" value="<?=$this->validation->passconf;?>" size="50" /> | |
<h5>Email Address</h5> | |
<input type="text" name="email" value="<?=$this->validation->email;?>" size="50" /> | |
<div><input type="submit" value="Submit" /></div> | |
</form> | |
</body> | |
</html> | |
</textarea> | |
<p>Now reload your page and submit the form so that it triggers an error. Your form fields should be populated | |
and the error messages will contain a more relevant field name.</p> | |
<h2>Showing Errors Individually</h2> | |
<p>If you prefer to show an error message next to each form field, rather than as a list, you can change your form so that it looks like this:</p> | |
<textarea class="textarea" style="width:100%" cols="50" rows="20"> | |
<h5>Username</h5> | |
<?=$this->validation->username_error; ?> | |
<input type="text" name="username" value="<?=$this->validation->username;?>" size="50" /> | |
<h5>Password</h5> | |
<?=$this->validation->password_error; ?> | |
<input type="text" name="password" value="<?=$this->validation->password;?>" size="50" /> | |
<h5>Password Confirm</h5> | |
<?=$this->validation->passconf_error; ?> | |
<input type="text" name="passconf" value="<?=$this->validation->passconf;?>" size="50" /> | |
<h5>Email Address</h5> | |
<?=$this->validation->email_error; ?> | |
<input type="text" name="email" value="<?=$this->validation->email;?>" size="50" /></textarea> | |
<p>If there are no errors, nothing will be shown. If there is an error, the message will appear, wrapped in the delimiters you | |
have set (<p> tags by default).</p> | |
<p class="important"><strong>Note: </strong>To display errors this way you must remember to set your fields using the <kbd>$this->validation->set_fields</kbd> | |
function described earlier. The errors will be turned into variables that have "_error" after your field name. | |
For example, your "username" error will be available at:<br /><dfn>$this->validation->username_error</dfn>.</p> | |
<h2>Rule Reference</h2> | |
<p>The following is a list of all the native rules that are available to use:</p> | |
<table cellpadding="0" cellspacing="1" border="0" style="width:100%" class="tableborder"> | |
<tr> | |
<th>Rule</th> | |
<th>Parameter</th> | |
<th>Description</th> | |
<th>Example</th> | |
</tr><tr> | |
<td class="td"><strong>required</strong></td> | |
<td class="td">No</td> | |
<td class="td">Returns FALSE if the form element is empty.</td> | |
<td class="td"> </td> | |
</tr><tr> | |
<td class="td"><strong>matches</strong></td> | |
<td class="td">Yes</td> | |
<td class="td">Returns FALSE if the form element does not match the one in the parameter.</td> | |
<td class="td">matches[form_item]</td> | |
</tr><tr> | |
<td class="td"><strong>min_length</strong></td> | |
<td class="td">Yes</td> | |
<td class="td">Returns FALSE if the form element is shorter then the parameter value.</td> | |
<td class="td">min_length[6]</td> | |
</tr><tr> | |
<td class="td"><strong>max_length</strong></td> | |
<td class="td">Yes</td> | |
<td class="td">Returns FALSE if the form element is longer then the parameter value.</td> | |
<td class="td">max_length[12]</td> | |
</tr><tr> | |
<td class="td"><strong>exact_length</strong></td> | |
<td class="td">Yes</td> | |
<td class="td">Returns FALSE if the form element is not exactly the parameter value.</td> | |
<td class="td">exact_length[8]</td> | |
</tr><tr> | |
<td class="td"><strong>alpha</strong></td> | |
<td class="td">No</td> | |
<td class="td">Returns FALSE if the form element contains anything other than alphabetical characters.</td> | |
<td class="td"> </td> | |
</tr><tr> | |
<td class="td"><strong>alpha_numeric</strong></td> | |
<td class="td">No</td> | |
<td class="td">Returns FALSE if the form element contains anything other than alpha-numeric characters.</td> | |
<td class="td"> </td> | |
</tr><tr> | |
<td class="td"><strong>alpha_dash</strong></td> | |
<td class="td">No</td> | |
<td class="td">Returns FALSE if the form element contains anything other than alpha-numeric characters, underscores or dashes.</td> | |
<td class="td"> </td> | |
</tr><tr> | |
<td class="td"><strong>numeric</strong></td> | |
<td class="td">No</td> | |
<td class="td">Returns FALSE if the form element contains anything other than numeric characters.</td> | |
<td class="td"> </td> | |
</tr><tr> | |
<td class="td"><strong>valid_email</strong></td> | |
<td class="td">No</td> | |
<td class="td">Returns FALSE if the form element does not contain a valid email address.</td> | |
<td class="td"> </td> | |
</tr> | |
<tr> | |
<td class="td"><strong>valid_ip</strong></td> | |
<td class="td">No</td> | |
<td class="td">Returns FALSE if the supplied IP is not valid.</td> | |
<td class="td"> </td> | |
</tr> | |
</table> | |
<p><strong>Note:</strong> These rules can also be called as discreet functions. For example:</p> | |
<code>$this->validation->required($string);</code> | |
<p class="important"><strong>Note:</strong> You can also use any native PHP functions that permit one parameter.</p> | |
<h2>Prepping Reference</h2> | |
<p>The following is a list of all the prepping functions that are available to use:</p> | |
<table cellpadding="0" cellspacing="1" border="0" style="width:100%" class="tableborder"> | |
<tr> | |
<th>Name</th> | |
<th>Parameter</th> | |
<th>Description</th> | |
</tr><tr> | |
<td class="td"><strong>xss_clean</strong></td> | |
<td class="td">No</td> | |
<td class="td">Runs the data through the XSS filtering function, described in the <a href="input.html">Input Class</a> page.</td> | |
</tr><tr> | |
<td class="td"><strong>prep_for_form</strong></td> | |
<td class="td">No</td> | |
<td class="td">Converts special characters so that HTML data can be shown in a form field without breaking it.</td> | |
</tr><tr> | |
<td class="td"><strong>prep_url</strong></td> | |
<td class="td">No</td> | |
<td class="td">Adds "http://" to URLs if missing.</td> | |
</tr><tr> | |
<td class="td"><strong>strip_image_tags</strong></td> | |
<td class="td">No</td> | |
<td class="td">Strips the HTML from image tags leaving the raw URL.</td> | |
</tr><tr> | |
<td class="td"><strong>encode_php_tags</strong></td> | |
<td class="td">No</td> | |
<td class="td">Converts PHP tags to entities.</td> | |
</tr> | |
</table> | |
<p class="important"><strong>Note:</strong> You can also use any native PHP functions that permit one parameter, | |
like <kbd>trim</kbd>, <kbd>htmlspecialchars</kbd>, <kbd>urldecode</kbd>, etc.</p> | |
<h2>Setting Custom Error Messages</h2> | |
<p>All of the native error messages are located in the following language file: <dfn>language/english/validation_lang.php</dfn></p> | |
<p>To set your own custom message you can either edit that file, or use the following function:</p> | |
<code>$this->validation->set_message('<var>rule</var>', '<var>Error Message</var>');</code> | |
<p>Where <var>rule</var> corresponds to the name of a particular rule, and <var>Error Message</var> is the text you would like displayed.</p> | |
<h2>Dealing with Select Menus, Radio Buttons, and Checkboxes</h2> | |
<p>If you use select menus, radio buttons or checkboxes, you will want the state of | |
these items to be retained in the event of an error. The Validation class has three functions that help you do this:</p> | |
<h2>set_select()</h2> | |
<p>Permits you to display the menu item that was selected. The first parameter | |
must contain the name of the select menu, the second parameter must contain the value of | |
each item. Example:</p> | |
<code> | |
<select name="myselect"><br /> | |
<option value="one" <dfn><?= $this->validation->set_select('myselect', 'one'); ?></dfn> >One</option><br /> | |
<option value="two" <dfn><?= $this->validation->set_select('myselect', 'two'); ?></dfn> >Two</option><br /> | |
<option value="three" <dfn><?= $this->validation->set_select('myselect', 'three'); ?></dfn> >Three</option><br /> | |
</select> | |
</code> | |
<h2>set_checkbox()</h2> | |
<p>Permits you to display a checkbox in the state it was submitted. The first parameter | |
must contain the name of the checkbox, the second parameter must contain its value. Example:</p> | |
<code><input type="checkbox" name="mycheck" value="1" <dfn><?= $this->validation->set_checkbox('mycheck', '1'); ?></dfn> /></code> | |
<h2>set_radio()</h2> | |
<p>Permits you to display radio buttons in the state they were submitted. The first parameter | |
must contain the name of the radio button, the second parameter must contain its value. Example:</p> | |
<code><input type="radio" name="myradio" value="1" <dfn><?= $this->validation->set_radio('myradio', '1'); ?></dfn> /></code> | |
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