| Derek Allard | 1a2cbdf | 2008-01-04 22:26:37 +0000 | [diff] [blame] | 1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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| Derek Allard | afd99ac | 2008-01-19 19:59:14 +0000 | [diff] [blame] | 2 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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| Derek Allard | 1a2cbdf | 2008-01-04 22:26:37 +0000 | [diff] [blame] | 3 | <head>
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| 4 |
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| 5 | <title>CodeIgniter User Guide : Form Helper</title>
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| Derek Allard | 3d879d5 | 2008-01-18 19:41:32 +0000 | [diff] [blame] | 19 | <meta name='author' content='ExpressionEngine Dev Team' />
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| Derek Allard | 1a2cbdf | 2008-01-04 22:26:37 +0000 | [diff] [blame] | 20 | <meta name='description' content='CodeIgniter User Guide' />
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| 21 |
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| 22 | </head>
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| 23 | <body>
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| 24 |
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| 25 | <!-- START NAVIGATION -->
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| 26 | <div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
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| 27 | <div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle.jpg" width="153" height="44" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
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| 28 | <div id="masthead">
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| 29 | <table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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| 30 | <tr>
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| Derek Allard | 39b622d | 2008-01-16 21:10:09 +0000 | [diff] [blame] | 31 | <td><h1>CodeIgniter User Guide Version 1.6.0</h1></td>
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| Derek Allard | 1a2cbdf | 2008-01-04 22:26:37 +0000 | [diff] [blame] | 32 | <td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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| 33 | </tr>
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| 34 | </table>
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| 35 | </div>
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| 36 | <!-- END NAVIGATION -->
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| 37 |
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| 38 |
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| 39 | <!-- START BREADCRUMB -->
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| 40 | <table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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| 41 | <tr>
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| 42 | <td id="breadcrumb">
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| 43 | <a href="http://www.codeigniter.com/">CodeIgniter Home</a> ›
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| 44 | <a href="../index.html">User Guide Home</a> ›
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| 45 | Form Helper
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| 46 | </td>
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| 47 | <td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
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| 48 | </tr>
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| 49 | </table>
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| 50 | <!-- END BREADCRUMB -->
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| 51 |
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| 52 | <br clear="all" />
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| 53 |
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| 54 |
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| 55 | <!-- START CONTENT -->
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| 56 | <div id="content">
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| 57 |
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| 58 |
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| 59 | <h1>Form Helper</h1>
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| 60 |
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| 61 | <p>The Form Helper file contains functions that assist in working with forms.</p>
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| 62 |
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| 63 |
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| 64 | <h2>Loading this Helper</h2>
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| 65 |
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| 66 | <p>This helper is loaded using the following code:</p>
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| 67 | <code>$this->load->helper('form');</code>
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| 68 |
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| 69 | <p>The following functions are available:</p>
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| 70 |
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| 71 |
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| 72 |
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| 73 | <h2>form_open()</h2>
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| 74 |
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| 75 | <p>Creates an opening form tag with a base URL <strong>built from your config preferences</strong>. It will optionally let you
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| 76 | add form attributes and hidden input fields.</p>
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| 77 |
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| 78 | <p>The main benefit of using this tag rather than hard coding your own HTML is that it permits your site to be more portable
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| 79 | in the event your URLs ever change.</p>
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| 80 |
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| 81 | <p>Here's a simple example:</p>
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| 82 |
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| 83 | <code>echo form_open('email/send');</code>
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| 84 |
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| 85 | <p>The above example would create a form that points to your base URL plus the "email/send" URI segments, like this:</p>
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| 86 |
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| 87 | <code><form method="post" action="http:/www.your-site.com/index.php/email/send" /></code>
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| 88 |
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| 89 | <h4>Adding Attributes</h4>
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| 90 |
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| 91 | <p>Attributes can be added by passing an associative array to the second parameter, like this:</p>
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| 92 |
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| 93 | <code>
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| 94 | $attributes = array('class' => 'email', 'id' => 'myform');<br />
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| 95 | <br />
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| 96 | echo form_open('email/send', $attributes);</code>
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| 97 |
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| 98 | <p>The above example would create a form similar to this:</p>
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| 99 |
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| 100 | <code><form method="post" action="http:/www.your-site.com/index.php/email/send" class="email" id="myform" /></code>
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| 101 |
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| 102 | <h4>Adding Hidden Input Fields</h4>
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| 103 |
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| 104 | <p>Hidden fields can be added by passing an associative array to the third parameter, like this:</p>
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| 105 |
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| 106 | <code>
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| 107 | $hidden = array('username' => 'Joe', 'member_id' => '234');<br />
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| 108 | <br />
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| 109 | echo form_open('email/send', '', $hidden);</code>
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| 110 |
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| 111 | <p>The above example would create a form similar to this:</p>
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| 112 |
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| 113 | <code><form method="post" action="http:/www.your-site.com/index.php/email/send" class="email" id="myform" /><br />
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| 114 | <input type="hidden" name="username" value="Joe" /><br />
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| 115 | <input type="hidden" name="member_id" value="234" /></code>
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| 116 |
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| 117 |
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| 118 | <h2>form_open_multipart()</h2>
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| 119 |
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| 120 | <p>This function is absolutely identical to the <dfn>form_open()</dfn> tag above except that it adds a multipart attribute,
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| 121 | which is necessary if you would like to use the form to upload files with.</p>
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| 122 |
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| 123 | <h2>form_hidden()</h2>
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| 124 |
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| 125 | <p>Lets you generate hidden input fields. You can either submit a name/value string to create one field:</p>
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| 126 |
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| 127 | <code>form_hidden('username', 'johndoe');<br />
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| 128 | <br />
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| 129 | // Would produce:<br /><br />
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| 130 | <input type="hidden" name="username" value="johnodoe" /></code>
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| 131 |
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| 132 | <p>Or you can submit an associative array to create multiple fields:</p>
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| 133 |
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| 134 | <code>$data = array(<br />
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| 135 | 'name' => 'John Doe',<br />
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| 136 | 'email' => 'john@example.com',<br />
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| 137 | 'url' => 'http://www.example.com'<br />
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| 138 | );<br />
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| 139 | <br />
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| 140 | echo form_hidden($data);<br />
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| 141 | <br />
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| 142 | // Would produce:<br /><br />
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| 143 | <input type="hidden" name="name" value="John Doe" /><br />
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| 144 | <input type="hidden" name="email" value="john@example.com" /><br />
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| 145 | <input type="hidden" name="url" value="http://www.example.com" /></code>
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| 146 |
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| 147 |
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| 148 |
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| 149 |
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| 150 | <h2>form_input()</h2>
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| 151 |
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| 152 | <p>Lets you generate a standard text input field. You can minimally pass the field name and value in the first
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| 153 | and second parameter:</p>
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| 154 |
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| 155 | <code>echo form_input('username', 'johndoe');</code>
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| 156 |
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| 157 | <p>Or you can pass an associative array containing any data you wish your form to contain:</p>
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| 158 |
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| 159 | <code>$data = array(<br />
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| 160 | 'name' => 'username',<br />
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| 161 | 'id' => 'username',<br />
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| 162 | 'value' => 'johndoe',<br />
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| 163 | 'maxlength' => '100',<br />
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| 164 | 'size' => '50',<br />
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| 165 | 'style' => 'width:50%',<br />
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| 166 | );<br />
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| 167 | <br />
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| 168 | echo form_input($data);<br />
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| 169 | <br />
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| 170 | // Would produce:<br /><br />
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| 171 | <input type="text" name="username" id="username" value="johndoe" maxlength="100" size="50" style="width:50%" /></code>
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| 172 |
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| 173 | <p>If you would like your form to contain some additional data, like JavaScript, you can pass it as a string in the
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| 174 | third parameter:</p>
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| 175 |
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| 176 | <code>$js = 'onClick="some_function()"';<br />
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| 177 | <br />
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| 178 | echo form_input('username', 'johndoe', $js);</code>
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| 179 |
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| 180 | <h2>form_password()</h2>
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| 181 |
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| 182 | <p>This function is identical in all respects to the <dfn>form_input()</dfn> function above
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| 183 | except that is sets it as a "password" type.</p>
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| 184 |
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| 185 | <h2>form_upload()</h2>
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| 186 |
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| 187 | <p>This function is identical in all respects to the <dfn>form_input()</dfn> function above
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| 188 | except that is sets it as a "file" type, allowing it to be used to upload files.</p>
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| 189 |
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| 190 | <h2>form_textarea()</h2>
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| 191 |
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| 192 | <p>This function is identical in all respects to the <dfn>form_input()</dfn> function above
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| 193 | except that it generates a "textarea" type. Note: Instead of the "maxlength" and "size" attributes in the above
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| 194 | example, you will instead specify "rows" and "cols".</p>
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| 195 |
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| 196 |
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| 197 | <h2>form_dropdown()</h2>
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| 198 |
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| 199 | <p>Lets you create a standard drop-down field. The first parameter will contain the name of the field,
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| 200 | the second parameter will contain an associative array of options, and the third parameter will contain the
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| 201 | value you wish to be selected. You can also pass an array through the third parameter, and CodeIgniter will create a multiple select for you. Example:</p>
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| 202 |
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| 203 | <code>$options = array(<br />
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| 204 | 'small' => 'Small Shirt',<br />
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| 205 | 'med' => 'Medium Shirt',<br />
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| 206 | 'large' => 'Large Shirt',<br />
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| 207 | 'xlarge' => 'Extra Large Shirt',<br />
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| 208 | );<br />
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| 209 | <br />
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| 210 | $shirts_on_sale = array('small', 'large');<br />
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| 211 | <br />
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| 212 | echo form_dropdown('shirts', $options, 'large');<br />
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| 213 | <br />
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| 214 | // Would produce:<br />
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| 215 | <br />
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| 216 | <select name="shirts"><br />
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| 217 | <option value="small">Small Shirt</option><br />
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| 218 | <option value="med">Medium Shirt</option><br />
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| 219 | <option value="large" selected="selected">Large Shirt</option><br />
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| 220 | <option value="xlarge">Extra Large Shirt</option><br />
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| 221 | </select><br />
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| 222 | <br />
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| 223 | echo form_dropdown('shirts', $options, $shirts_on_sale);<br />
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| 224 | <br />
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| 225 | // Would produce:<br />
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| 226 | <br />
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| 227 | <select name="shirts" multiple="multiple"><br />
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| 228 | <option value="small" selected="selected">Small Shirt</option><br />
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| 229 | <option value="med">Medium Shirt</option><br />
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| 230 | <option value="large" selected="selected">Large Shirt</option><br />
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| 231 | <option value="xlarge">Extra Large Shirt</option><br />
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| 232 | </select></code>
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| 233 |
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| 234 |
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| 235 | <p>If you would like the opening <select> to contain additional data, like JavaScript, you can pass it as a string in the
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| 236 | fourth parameter:</p>
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| 237 |
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| 238 | <code>$js = 'onChange="some_function()"';<br />
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| 239 | <br />
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| 240 | echo form_dropdown('shirts', $options, 'large', $js);</code>
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| 241 |
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| 242 |
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| 243 | <h2>form_fieldset()</h2>
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| 244 |
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| 245 | <p>Lets you generate fieldset/legend fields.</p>
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| 246 | <code>echo form_fieldset('Address Information');<br />
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| 247 | echo "<p>fieldset content here</p>\n";<br />
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| 248 | echo form_fieldset_close();
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| 249 | <br />
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| 250 | <br />
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| 251 | // Produces<br />
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| 252 | <fieldset id="address_info">
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| 253 | <br />
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| 254 | <legend>Address Information</legend>
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| 255 | <br />
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| 256 | <p>form content here</p>
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| 257 | <br />
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| 258 | </fieldset></code>
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| 259 | <p>Similar to other functions, you can submit an associative array in the second parameter if you prefer to set additional attributes. </p>
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| 260 | <p><code>$attributes = array('id' => 'address_info', 'class' => 'address_info');<br />
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| 261 | echo form_fieldset('Address Information', $attributes);<br />
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| 262 | echo "<p>fieldset content here</p>\n";<br />
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| 263 | echo form_fieldset_close(); <br />
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| 264 | <br />
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| 265 | // Produces<br />
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| 266 | <fieldset id="address_info" class="address_info"> <br />
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| 267 | <legend>Address Information</legend> <br />
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| 268 | <p>form content here</p> <br />
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| 269 | </fieldset></code></p>
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| 270 | <h2>form_fieldset_close()</h2>
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| 271 | <p>Produces a closing </fieldset> tag. The only advantage to using this function is it permits you to pass data to it
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| 272 | which will be added below the tag. For example:</p>
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| 273 | <code>$string = "</div></div>";<br />
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| 274 | <br />
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| 275 | echo fieldset_close($string);<br />
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| 276 | <br />
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| 277 | // Would produce:<br />
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| 278 | </fieldset><br />
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| 279 | </div></div></code>
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| 280 | <h2>form_checkbox()</h2>
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| 281 | <p>Lets you generate a checkbox field. Simple example:</p>
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| 282 | <code>echo form_checkbox('newsletter', 'accept', TRUE);<br />
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| 283 | <br />
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| 284 | // Would produce:<br />
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| 285 | <br />
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| 286 | <input type="checkbox" name="newsletter" value="accept" checked="checked" /></code>
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| 287 | <p>The third parameter contains a boolean TRUE/FALSE to determine whether the box should be checked or not.</p>
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| 288 | <p>Similar to the other form functions in this helper, you can also pass an array of attributes to the function:</p>
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| 289 |
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| 290 | <code>$data = array(<br />
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| 291 | 'name' => 'newsletter',<br />
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| 292 | 'id' => 'newsletter',<br />
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| 293 | 'value' => 'accept',<br />
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| 294 | 'checked' => TRUE,<br />
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| 295 | 'style' => 'margin:10px',<br />
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| 296 | );<br />
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| 297 | <br />
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| 298 | echo form_checkbox($data);<br />
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| 299 | <br />
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| 300 | // Would produce:<br /><br />
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| 301 | <input type="checkbox" name="newsletter" id="newsletter" value="accept" checked="checked" style="margin:10px" /></code>
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| 302 |
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| 303 | <p>As with other functions, if you would like the tag to contain additional data, like JavaScript, you can pass it as a string in the
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| 304 | fourth parameter:</p>
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| 305 |
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| 306 | <code>$js = 'onClick="some_function()"';<br />
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| 307 | <br />
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| 308 | echo form_checkbox('newsletter', 'accept', TRUE, $js)</code>
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| 309 |
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| 310 |
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| 311 | <h2>form_radio()</h2>
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| 312 | <p>This function is identical in all respects to the <dfn>form_checkbox()</dfn> function above except that is sets it as a "radio" type.</p>
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| 313 |
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| 314 |
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| 315 | <h2>form_submit()</h2>
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| 316 |
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| 317 | <p>Lets you generate a standard submit button. Simple example:</p>
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| 318 | <code>echo form_submit('mysubmit', 'Submit Post!');<br />
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| 319 | <br />
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| 320 | // Would produce:<br />
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| 321 | <br />
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| 322 | <input type="submit" name="mysubmit" value="Submit Post!" /></code>
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| 323 | <p>Similar to other functions, you can submit an associative array in the first parameter if you prefer to set your own attributes.
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| 324 | The third parameter lets you add extra data to your form, like JavaScript.</p>
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| 325 | <h2>form_label()</h2>
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| 326 | <p>Lets you generate a <label>. Simple example:</p>
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| 327 | <code>echo form_label('What is your Name', 'username');<br />
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| 328 | <br />
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| 329 | // Would produce:
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| 330 | <br />
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| 331 | <label id="username">What is your Name</label></code>
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| 332 | <p>Similar to other functions, you can submit an associative array in the third parameter if you prefer to set additional attributes. </p>
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| 333 | <p><code>$attributes = array(<br />
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| 334 | 'class' => 'mycustomclass',<br />
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| 335 | 'style' => 'color: #000;',<br />
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| 336 | );<br />
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| 337 | echo form_label('What is your Name', 'username', $attributes);<br />
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| 338 | <br />
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| 339 | // Would produce: <br />
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| 340 | <label id="username" class="mycustomclass" style="color: #000;">What is your Name</label></code></p>
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| 341 | <h2>form_reset()</h2>
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| 342 |
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| 343 | <p>Lets you generate a standard reset button. Use is identical to <dfn>form_submit()</dfn>.</p>
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| 344 |
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| 345 | <h2>form_close()</h2>
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| 346 |
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| 347 | <p>Produces a closing </form> tag. The only advantage to using this function is it permits you to pass data to it
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| 348 | which will be added below the tag. For example:</p>
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| 349 |
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| 350 | <code>$string = "</div></div>";<br />
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| 351 | <br />
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| 352 | echo form_close($string);<br />
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| 353 | <br />
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| 354 | // Would produce:<br />
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| 355 | <br />
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| 356 | </form><br />
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| 357 | </div></div></code>
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| 358 |
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| 359 |
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| 360 |
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| 361 |
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| 362 |
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| 363 | <h2>form_prep()</h2>
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| 364 |
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| 365 | <p>Allows you to safely use HTML and characters such as quotes within form elements without breaking out of the form. Consider this example:</p>
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| 366 |
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| 367 | <code>$string = 'Here is a string containing <strong>"quoted"</strong> text.';<br />
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| 368 | <br />
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| 369 | <input type="text" name="myform" value="<var>$string</var>" /></code>
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| 370 |
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| 371 | <p>Since the above string contains a set of quotes it will cause the form to break.
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| 372 | The form_prep function converts HTML so that it can be used safely:</p>
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| 373 |
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| 374 | <code><input type="text" name="myform" value="<var><?php echo form_prep($string); ?></var>" /></code>
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| 375 |
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| 376 | <p class="important"><strong>Note:</strong> If you use any of the form helper functions listed in this page the form
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| 377 | values will be prepped automatically, so there is no need to call this function. Use it only if you are
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| 378 | creating your own form elements.</p>
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| 379 |
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| 380 |
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| 381 |
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| 382 |
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| 383 | </div>
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| 384 | <!-- END CONTENT -->
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| 385 |
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| 386 |
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| 387 | <div id="footer">
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| 388 | <p>
|
| 389 | Previous Topic: <a href="file_helper.html">File Helper</a>
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| 390 | ·
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| 391 | <a href="#top">Top of Page</a> ·
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| 392 | <a href="../index.html">User Guide Home</a> ·
|
| 393 | Next Topic: <a href="html_helper.html">HTML Helper</a>
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| 394 | </p>
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| 395 | <p><a href="http://www.codeigniter.com">CodeIgniter</a> · Copyright © 2007 · <a href="http://ellislab.com/">Ellislab, Inc.</a></p>
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| 396 | </div>
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| 397 |
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| 398 | </body>
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| Derek Allard | 402835c | 2008-01-04 14:30:58 +0000 | [diff] [blame] | 399 | </html> |