/user_guide/helpers/form_helper.html
Relevant Search: With Applications for Solr and Elasticsearch
For more in depth reading about search, ranking and generally everything you could ever want to know about how lucene, elasticsearch or solr work under the hood I highly suggest this book. Easily one of the most interesting technical books I have read in a long time. If you are tasked with solving search relevance problems even if not in Solr or Elasticsearch it should be your first reference. Amazon Affiliate LinkHTML | 1598 lines | 1456 code | 141 blank | 1 comment | 0 complexity | 3c803a166ac162a58936346a8f828db9 MD5 | raw file
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379<li class="toctree-l2"><a class="reference internal" href="smiley_helper.html">Smiley Helper</a></li> 380<li class="toctree-l2"><a class="reference internal" href="string_helper.html">String Helper</a></li> 381<li class="toctree-l2"><a class="reference internal" href="text_helper.html">Text Helper</a></li> 382<li class="toctree-l2"><a class="reference internal" href="typography_helper.html">Typography Helper</a></li> 383<li class="toctree-l2"><a class="reference internal" href="url_helper.html">URL Helper</a></li> 384<li class="toctree-l2"><a class="reference internal" href="xml_helper.html">XML Helper</a></li> 385</ul> 386</li> 387</ul> 388 389 390 391 </div> 392 393 </nav> 394 395 <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> 396 397 398 <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> 399 <i data-toggle="wy-nav-top" class="fa fa-bars"></i> 400 <a href="../index.html">CodeIgniter</a> 401 </nav> 402 403 404 405 <div class="wy-nav-content"> 406 <div class="rst-content"> 407 <div role="navigation" aria-label="breadcrumbs navigation"> 408 <ul class="wy-breadcrumbs"> 409 <li><a href="../index.html">Docs</a> »</li> 410 411 <li><a href="index.html">Helpers</a> »</li> 412 413 <li>Form Helper</li> 414 <li class="wy-breadcrumbs-aside"> 415 416 </li> 417 <div style="float:right;margin-left:5px;" id="closeMe"> 418 <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> 419 </div> 420 </ul> 421 <hr/> 422</div> 423 <div role="main" class="document"> 424 425 <div class="section" id="form-helper"> 426<h1>Form Helper<a class="headerlink" href="#form-helper" title="Permalink to this headline">¶</a></h1> 427<p>The Form Helper file contains functions that assist in working with 428forms.</p> 429<div class="contents local topic" id="contents"> 430<ul class="simple"> 431<li><a class="reference internal" href="#loading-this-helper" id="id1">Loading this Helper</a></li> 432<li><a class="reference internal" href="#escaping-field-values" id="id2">Escaping field values</a></li> 433<li><a class="reference internal" href="#available-functions" id="id3">Available Functions</a></li> 434</ul> 435</div> 436<div class="custom-index container"></div><div class="section" id="loading-this-helper"> 437<h2><a class="toc-backref" href="#id1">Loading this Helper</a><a class="headerlink" href="#loading-this-helper" title="Permalink to this headline">¶</a></h2> 438<p>This helper is loaded using the following code:</p> 439<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'form'</span><span class="p">);</span> 440</pre></div> 441</div> 442</div> 443<div class="section" id="escaping-field-values"> 444<h2><a class="toc-backref" href="#id2">Escaping field values</a><a class="headerlink" href="#escaping-field-values" title="Permalink to this headline">¶</a></h2> 445<p>You may need to use HTML and characters such as quotes within your form 446elements. In order to do that safely, you’ll need to use 447<a class="reference internal" href="../general/common_functions.html"><span class="doc">common function</span></a> 448<code class="xref py py-func docutils literal"><span class="pre">html_escape()</span></code>.</p> 449<p>Consider the following example:</p> 450<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="s1">'Here is a string containing "quoted" text.'</span><span class="p">;</span> 451 452<span class="o"><</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">"text"</span> <span class="nx">name</span><span class="o">=</span><span class="s2">"myfield"</span> <span class="nx">value</span><span class="o">=</span><span class="s2">"<?php echo </span><span class="si">$string</span><span class="s2">; ?>"</span> <span class="o">/></span> 453</pre></div> 454</div> 455<p>Since the above string contains a set of quotes, it will cause the form 456to break. The <a class="reference internal" href="../general/common_functions.html#html_escape" title="html_escape"><code class="xref php php-func docutils literal"><span class="pre">html_escape()</span></code></a> function converts HTML special 457characters so that it can be used safely:</p> 458<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">"text"</span> <span class="nx">name</span><span class="o">=</span><span class="s2">"myfield"</span> <span class="nx">value</span><span class="o">=</span><span class="s2">"<?php echo html_escape(</span><span class="si">$string</span><span class="s2">); ?>"</span> <span class="o">/></span> 459</pre></div> 460</div> 461<div class="admonition note"> 462<p class="first admonition-title">Note</p> 463<p class="last">If you use any of the form helper functions listed on this page, 464the form values will be automatically escaped, so there is no need 465to call this function. Use it only if you are creating your own 466form elements.</p> 467</div> 468</div> 469<div class="section" id="available-functions"> 470<h2><a class="toc-backref" href="#id3">Available Functions</a><a class="headerlink" href="#available-functions" title="Permalink to this headline">¶</a></h2> 471<p>The following functions are available:</p> 472<dl class="function"> 473<dt id="form_open"> 474<code class="descname">form_open</code><span class="sig-paren">(</span><span class="optional">[</span><em>$action = ''</em><span class="optional">[</span>, <em>$attributes = ''</em><span class="optional">[</span>, <em>$hidden = array()</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#form_open" title="Permalink to this definition">¶</a></dt> 475<dd><table class="docutils field-list" frame="void" rules="none"> 476<col class="field-name" /> 477<col class="field-body" /> 478<tbody valign="top"> 479<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> 480<li><strong>$action</strong> (<em>string</em>) – Form action/target URI string</li> 481<li><strong>$attributes</strong> (<em>array</em>) – HTML attributes</li> 482<li><strong>$hidden</strong> (<em>array</em>) – An array of hidden fields’ definitions</li> 483</ul> 484</td> 485</tr> 486<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">An HTML form opening tag</p> 487</td> 488</tr> 489<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> 490</td> 491</tr> 492</tbody> 493</table> 494<p>Creates an opening form tag with a base URL <strong>built from your config preferences</strong>. 495It will optionally let you add form attributes and hidden input fields, and 496will always add the <cite>accept-charset</cite> attribute based on the charset value in your 497config file.</p> 498<p>The main benefit of using this tag rather than hard coding your own HTML is that 499it permits your site to be more portable in the event your URLs ever change.</p> 500<p>Here’s a simple example:</p> 501<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nx">form_open</span><span class="p">(</span><span class="s1">'email/send'</span><span class="p">);</span> 502</pre></div> 503</div> 504<p>The above example would create a form that points to your base URL plus the 505“email/send” URI segments, like this:</p> 506<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><</span><span class="nx">form</span> <span class="nx">method</span><span class="o">=</span><span class="s2">"post"</span> <span class="nx">accept</span><span class="o">-</span><span class="nx">charset</span><span class="o">=</span><span class="s2">"utf-8"</span> <span class="nx">action</span><span class="o">=</span><span class="s2">"http://example.com/index.php/email/send"</span><span class="o">></span> 507</pre></div> 508</div> 509<p><strong>Adding Attributes</strong></p> 510<blockquote> 511<div><p>Attributes can be added by passing an associative array to the second 512parameter, like this:</p> 513<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$attributes</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'class'</span> <span class="o">=></span> <span class="s1">'email'</span><span class="p">,</span> <span class="s1">'id'</span> <span class="o">=></span> <span class="s1">'myform'</span><span class="p">);</span> 514<span class="k">echo</span> <span class="nx">form_open</span><span class="p">(</span><span class="s1">'email/send'</span><span class="p">,</span> <span class="nv">$attributes</span><span class="p">);</span> 515</pre></div> 516</div> 517<p>Alternatively, you can specify the second parameter as a string:</p> 518<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nx">form_open</span><span class="p">(</span><span class="s1">'email/send'</span><span class="p">,</span> <span class="s1">'class="email" id="myform"'</span><span class="p">);</span> 519</pre></div> 520</div> 521<p>The above examples would create a form similar to this:</p> 522<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><</span><span class="nx">form</span> <span class="nx">method</span><span class="o">=</span><span class="s2">"post"</span> <span class="nx">accept</span><span class="o">-</span><span class="nx">charset</span><span class="o">=</span><span class="s2">"utf-8"</span> <span class="nx">action</span><span class="o">=</span><span class="s2">"http://example.com/index.php/email/send"</span> <span class="nx">class</span><span class="o">=</span><span class="s2">"email"</span> <span class="nx">id</span><span class="o">=</span><span class="s2">"myform"</span><span class="o">></span> 523</pre></div> 524</div> 525</div></blockquote> 526<p><strong>Adding Hidden Input Fields</strong></p> 527<blockquote> 528<div><p>Hidden fields can be added by passing an associative array to the 529third parameter, like this:</p> 530<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$hidden</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'username'</span> <span class="o">=></span> <span class="s1">'Joe'</span><span class="p">,</span> <span class="s1">'member_id'</span> <span class="o">=></span> <span class="s1">'234'</span><span class="p">);</span> 531<span class="k">echo</span> <span class="nx">form_open</span><span class="p">(</span><span class="s1">'email/send'</span><span class="p">,</span> <span class="s1">''</span><span class="p">,</span> <span class="nv">$hidden</span><span class="p">);</span> 532</pre></div> 533</div> 534<p>You can skip the second parameter by passing any falsy value to it.</p> 535<p>The above example would create a form similar to this:</p> 536<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><</span><span class="nx">form</span> <span class="nx">method</span><span class="o">=</span><span class="s2">"post"</span> <span class="nx">accept</span><span class="o">-</span><span class="nx">charset</span><span class="o">=</span><span class="s2">"utf-8"</span> <span class="nx">action</span><span class="o">=</span><span class="s2">"http://example.com/index.php/email/send"</span><span class="o">></span> 537 <span class="o"><</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">"hidden"</span> <span class="nx">name</span><span class="o">=</span><span class="s2">"username"</span> <span class="nx">value</span><span class="o">=</span><span class="s2">"Joe"</span> <span class="o">/></span> 538 <span class="o"><</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">"hidden"</span> <span class="nx">name</span><span class="o">=</span><span class="s2">"member_id"</span> <span class="nx">value</span><span class="o">=</span><span class="s2">"234"</span> <span class="o">/></span> 539</pre></div> 540</div> 541</div></blockquote> 542</dd></dl> 543 544<dl class="function"> 545<dt id="form_open_multipart"> 546<code class="descname">form_open_multipart</code><span class="sig-paren">(</span><span class="optional">[</span><em>$action = ''</em><span class="optional">[</span>, <em>$attributes = array()</em><span class="optional">[</span>, <em>$hidden = array()</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#form_open_multipart" title="Permalink to this definition">¶</a></dt> 547<dd><table class="docutils field-list" frame="void" rules="none"> 548<col class="field-name" /> 549<col class="field-body" /> 550<tbody valign="top"> 551<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> 552<li><strong>$action</strong> (<em>string</em>) – Form action/target URI string</li> 553<li><strong>$attributes</strong> (<em>array</em>) – HTML attributes</li> 554<li><strong>$hidden</strong> (<em>array</em>) – An array of hidden fields’ definitions</li> 555</ul> 556</td> 557</tr> 558<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">An HTML multipart form opening tag</p> 559</td> 560</tr> 561<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> 562</td> 563</tr> 564</tbody> 565</table> 566<p>This function is absolutely identical to <a class="reference internal" href="#form_open" title="form_open"><code class="xref php php-func docutils literal"><span class="pre">form_open()</span></code></a> above, 567except that it adds a <em>multipart</em> attribute, which is necessary if you 568would like to use the form to upload files with.</p> 569</dd></dl> 570 571<dl class="function"> 572<dt id="form_hidden"> 573<code class="descname">form_hidden</code><span class="sig-paren">(</span><em>$name</em><span class="optional">[</span>, <em>$value = ''</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#form_hidden" title="Permalink to this definition">¶</a></dt> 574<dd><table class="docutils field-list" frame="void" rules="none"> 575<col class="field-name" /> 576<col class="field-body" /> 577<tbody valign="top"> 578<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> 579<li><strong>$name</strong> (<em>string</em>) – Field name</li> 580<li><strong>$value</strong> (<em>string</em>) – Field value</li> 581</ul> 582</td> 583</tr> 584<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">An HTML hidden input field tag</p> 585</td> 586</tr> 587<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> 588</td> 589</tr> 590</tbody> 591</table> 592<p>Lets you generate hidden input fields. You can either submit a 593name/value string to create one field:</p> 594<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">form_hidden</span><span class="p">(</span><span class="s1">'username'</span><span class="p">,</span> <span class="s1">'johndoe'</span><span class="p">);</span> 595<span class="c1">// Would produce: <input type="hidden" name="username" value="johndoe" /></span> 596</pre></div> 597</div> 598<p>… or you can submit an associative array to create multiple fields:</p> 599<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> 600 <span class="s1">'name'</span> <span class="o">=></span> <span class="s1">'John Doe'</span><span class="p">,</span> 601 <span class="s1">'email'</span> <span class="o">=></span> <span class="s1">'john@example.com'</span><span class="p">,</span> 602 <span class="s1">'url'</span> <span class="o">=></span> <span class="s1">'http://example.com'</span> 603<span class="p">);</span> 604 605<span class="k">echo</span> <span class="nx">form_hidden</span><span class="p">(</span><span class="nv">$data</span><span class="p">);</span> 606 607<span class="cm">/*</span> 608<span class="cm"> Would produce:</span> 609<span class="cm"> <input type="hidden" name="name" value="John Doe" /></span> 610<span class="cm"> <input type="hidden" name="email" value="john@example.com" /></span> 611<span class="cm"> <input type="hidden" name="url" value="http://example.com" /></span> 612<span class="cm">*/</span> 613</pre></div> 614</div> 615<p>You can also pass an associative array to the value field:</p> 616<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> 617 <span class="s1">'name'</span> <span class="o">=></span> <span class="s1">'John Doe'</span><span class="p">,</span> 618 <span class="s1">'email'</span> <span class="o">=></span> <span class="s1">'john@example.com'</span><span class="p">,</span> 619 <span class="s1">'url'</span> <span class="o">=></span> <span class="s1">'http://example.com'</span> 620<span class="p">);</span> 621 622<span class="k">echo</span> <span class="nx">form_hidden</span><span class="p">(</span><span class="s1">'my_array'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span> 623 624<span class="cm">/*</span> 625<span class="cm"> Would produce:</span> 626 627<span class="cm"> <input type="hidden" name="my_array[name]" value="John Doe" /></span> 628<span class="cm"> <input type="hidden" name="my_array[email]" value="john@example.com" /></span> 629<span class="cm"> <input type="hidden" name="my_array[url]" value="http://example.com" /></span> 630<span class="cm">*/</span> 631</pre></div> 632</div> 633<p>If you want to create hidden input fields with extra attributes:</p> 634<div class="highlight-ci"><div class="highlight"><pre>…
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