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| <div class="section" id="create-news-items"> |
| <h1>Create news items<a class="headerlink" href="#create-news-items" title="Permalink to this headline">¶</a></h1> |
| <p>You now know how you can read data from a database using CodeIgniter, but |
| you haven’t written any information to the database yet. In this section |
| you’ll expand your news controller and model created earlier to include |
| this functionality.</p> |
| <div class="section" id="create-a-form"> |
| <h2>Create a form<a class="headerlink" href="#create-a-form" title="Permalink to this headline">¶</a></h2> |
| <p>To input data into the database you need to create a form where you can |
| input the information to be stored. This means you’ll be needing a form |
| with two fields, one for the title and one for the text. You’ll derive |
| the slug from our title in the model. Create the new view at |
| <em>application/views/news/create.php</em>.</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><</span><span class="nx">h2</span><span class="o">><?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nv">$title</span><span class="p">;</span> <span class="cp">?></span><span class="p"></</span><span class="nt">h2</span><span class="p">></span> |
| |
| <span class="cp"><?php</span> <span class="k">echo</span> <span class="nx">validation_errors</span><span class="p">();</span> <span class="cp">?></span> |
| |
| <span class="cp"><?php</span> <span class="k">echo</span> <span class="nx">form_open</span><span class="p">(</span><span class="s1">'news/create'</span><span class="p">);</span> <span class="cp">?></span> |
| |
| <span class="p"><</span><span class="nt">label</span> <span class="na">for</span><span class="o">=</span><span class="s">"title"</span><span class="p">></span>Title<span class="p"></</span><span class="nt">label</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">input</span> <span class="na">type</span><span class="o">=</span><span class="s">"input"</span> <span class="na">name</span><span class="o">=</span><span class="s">"title"</span> <span class="p">/><</span><span class="nt">br</span> <span class="p">/></span> |
| |
| <span class="p"><</span><span class="nt">label</span> <span class="na">for</span><span class="o">=</span><span class="s">"text"</span><span class="p">></span>Text<span class="p"></</span><span class="nt">label</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">textarea</span> <span class="na">name</span><span class="o">=</span><span class="s">"text"</span><span class="p">></</span><span class="nt">textarea</span><span class="p">><</span><span class="nt">br</span> <span class="p">/></span> |
| |
| <span class="p"><</span><span class="nt">input</span> <span class="na">type</span><span class="o">=</span><span class="s">"submit"</span> <span class="na">name</span><span class="o">=</span><span class="s">"submit"</span> <span class="na">value</span><span class="o">=</span><span class="s">"Create news item"</span> <span class="p">/></span> |
| |
| <span class="p"></</span><span class="nt">form</span><span class="p">></span> |
| </pre></div> |
| </div> |
| <p>There are only two things here that probably look unfamiliar to you: the |
| <code class="docutils literal"><span class="pre">form_open()</span></code> function and the <code class="docutils literal"><span class="pre">validation_errors()</span></code> function.</p> |
| <p>The first function is provided by the <a class="reference internal" href="../helpers/form_helper.html"><span class="doc">form |
| helper</span></a> and renders the form element and |
| adds extra functionality, like adding a hidden <a class="reference internal" href="../libraries/security.html"><span class="doc">CSRF prevention |
| field</span></a>. The latter is used to report |
| errors related to form validation.</p> |
| <p>Go back to your news controller. You’re going to do two things here, |
| check whether the form was submitted and whether the submitted data |
| passed the validation rules. You’ll use the <a class="reference internal" href="../libraries/form_validation.html"><span class="doc">form |
| validation</span></a> library to do this.</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">create</span><span class="p">()</span> |
| <span class="p">{</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> |
| <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'form_validation'</span><span class="p">);</span> |
| |
| <span class="nv">$data</span><span class="p">[</span><span class="s1">'title'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'Create a news item'</span><span class="p">;</span> |
| |
| <span class="nv">$this</span><span class="o">-></span><span class="na">form_validation</span><span class="o">-></span><span class="na">set_rules</span><span class="p">(</span><span class="s1">'title'</span><span class="p">,</span> <span class="s1">'Title'</span><span class="p">,</span> <span class="s1">'required'</span><span class="p">);</span> |
| <span class="nv">$this</span><span class="o">-></span><span class="na">form_validation</span><span class="o">-></span><span class="na">set_rules</span><span class="p">(</span><span class="s1">'text'</span><span class="p">,</span> <span class="s1">'Text'</span><span class="p">,</span> <span class="s1">'required'</span><span class="p">);</span> |
| |
| <span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">form_validation</span><span class="o">-></span><span class="na">run</span><span class="p">()</span> <span class="o">===</span> <span class="k">FALSE</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'templates/header'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span> |
| <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'news/create'</span><span class="p">);</span> |
| <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'templates/footer'</span><span class="p">);</span> |
| |
| <span class="p">}</span> |
| <span class="k">else</span> |
| <span class="p">{</span> |
| <span class="nv">$this</span><span class="o">-></span><span class="na">news_model</span><span class="o">-></span><span class="na">set_news</span><span class="p">();</span> |
| <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'news/success'</span><span class="p">);</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>The code above adds a lot of functionality. The first few lines load the |
| form helper and the form validation library. After that, rules for the |
| form validation are set. The <code class="docutils literal"><span class="pre">set_rules()</span></code> method takes three arguments; |
| the name of the input field, the name to be used in error messages, and |
| the rule. In this case the title and text fields are required.</p> |
| <p>CodeIgniter has a powerful form validation library as demonstrated |
| above. You can read <a class="reference internal" href="../libraries/form_validation.html"><span class="doc">more about this library |
| here</span></a>.</p> |
| <p>Continuing down, you can see a condition that checks whether the form |
| validation ran successfully. If it did not, the form is displayed, if it |
| was submitted <strong>and</strong> passed all the rules, the model is called. After |
| this, a view is loaded to display a success message. Create a view at |
| <em>application/views/news/success.php</em> and write a success message.</p> |
| </div> |
| <div class="section" id="model"> |
| <h2>Model<a class="headerlink" href="#model" title="Permalink to this headline">¶</a></h2> |
| <p>The only thing that remains is writing a method that writes the data to |
| the database. You’ll use the Query Builder class to insert the |
| information and use the input library to get the posted data. Open up |
| the model created earlier and add the following:</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">set_news</span><span class="p">()</span> |
| <span class="p">{</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">'url'</span><span class="p">);</span> |
| |
| <span class="nv">$slug</span> <span class="o">=</span> <span class="nx">url_title</span><span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">input</span><span class="o">-></span><span class="na">post</span><span class="p">(</span><span class="s1">'title'</span><span class="p">),</span> <span class="s1">'dash'</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span> |
| |
| <span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> |
| <span class="s1">'title'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">input</span><span class="o">-></span><span class="na">post</span><span class="p">(</span><span class="s1">'title'</span><span class="p">),</span> |
| <span class="s1">'slug'</span> <span class="o">=></span> <span class="nv">$slug</span><span class="p">,</span> |
| <span class="s1">'text'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">input</span><span class="o">-></span><span class="na">post</span><span class="p">(</span><span class="s1">'text'</span><span class="p">)</span> |
| <span class="p">);</span> |
| |
| <span class="k">return</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">insert</span><span class="p">(</span><span class="s1">'news'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>This new method takes care of inserting the news item into the database. |
| The third line contains a new function, url_title(). This function - |
| provided by the <a class="reference internal" href="../helpers/url_helper.html"><span class="doc">URL helper</span></a> - strips down |
| the string you pass it, replacing all spaces by dashes (-) and makes |
| sure everything is in lowercase characters. This leaves you with a nice |
| slug, perfect for creating URIs.</p> |
| <p>Let’s continue with preparing the record that is going to be inserted |
| later, inside the <code class="docutils literal"><span class="pre">$data</span></code> array. Each element corresponds with a column in |
| the database table created earlier. You might notice a new method here, |
| namely the <code class="docutils literal"><span class="pre">post()</span></code> method from the <a class="reference internal" href="../libraries/input.html"><span class="doc">input |
| library</span></a>. This method makes sure the data is |
| sanitized, protecting you from nasty attacks from others. The input |
| library is loaded by default. At last, you insert our <code class="docutils literal"><span class="pre">$data</span></code> array into |
| our database.</p> |
| </div> |
| <div class="section" id="routing"> |
| <h2>Routing<a class="headerlink" href="#routing" title="Permalink to this headline">¶</a></h2> |
| <p>Before you can start adding news items into your CodeIgniter application |
| you have to add an extra rule to <em>config/routes.php</em> file. Make sure your |
| file contains the following. This makes sure CodeIgniter sees ‘create’ |
| as a method instead of a news item’s slug.</p> |
| <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$route</span><span class="p">[</span><span class="s1">'news/create'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'news/create'</span><span class="p">;</span> |
| <span class="nv">$route</span><span class="p">[</span><span class="s1">'news/(:any)'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'news/view/$1'</span><span class="p">;</span> |
| <span class="nv">$route</span><span class="p">[</span><span class="s1">'news'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'news'</span><span class="p">;</span> |
| <span class="nv">$route</span><span class="p">[</span><span class="s1">'(:any)'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'pages/view/$1'</span><span class="p">;</span> |
| <span class="nv">$route</span><span class="p">[</span><span class="s1">'default_controller'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'pages/view'</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>Now point your browser to your local development environment where you |
| installed CodeIgniter and add index.php/news/create to the URL. |
| Congratulations, you just created your first CodeIgniter application! |
| Add some news and check out the different pages you made.</p> |
| </div> |
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