316 lines
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<h4>This Page</h4>
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<ul class="toc">
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<li><a href="#how-does-flow-work">How does Flow Work?</a></li>
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<li><a href="#flow-block-models">Flow Block Models</a></li>
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<li><a href="#block-templating">Block Templating</a></li>
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<li><a href="#flow-templating">Flow Templating</a></li>
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<div class="col-sm-9 doc-styling">
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<h1>Flow</h1>
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<ul class=page-meta>
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</ul>
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<p>Flow is a system in Lektor that allows you to have higher flexibility when
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creating pages. The <a href="../../api/db/types/flow/" class="ref">Flow Type</a> field type
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that allows you to store multiple different formats of data within the same
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field each with its own template.</p>
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<p>This allows you to build complex pages made from individual components.</p>
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<h2 id="how-does-flow-work">How does Flow Work?</h2><p>When you add a <code>flow</code> field to one of your models you essentially gain the
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ability to attach as many blocks as you want into this field. Each block
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corresponds to a specific <a href="../../models/flow/" class="ref">Flow Block Model</a> and
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can render a separate template.</p>
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<p>This is a very powerful feature as it allows you to be very flexible in the
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designs you want to achieve for your website. As an example, the
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<a href="../../../">Front Page</a> of this website uses many different blocks to
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implement the slideshow, feature list and more.</p>
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<p><img src="flow-admin.png" class="screenshot" alt=""></p>
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<h2 id="flow-block-models">Flow Block Models</h2><p>To use the <code>flow</code> type you need to define some blocks. This works pretty
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much the same as with creating <a href="../../models/" class="ref">Data Models</a> except they
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go into the <code>flowblocks</code> folder and have slightly different parameters.</p>
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<p>For more information about this see <a href="../../models/flow/" class="ref">Flow Block Models</a>.</p>
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<h2 id="block-templating">Block Templating</h2><p>Flow blocks appear as elements of the flow type. When it's rendered in a
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template it will render each block separately one after another and connect
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them with newlines. These blocks can also manually be accessed however.
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Each flow block renders a template named after itself from the <code>blocks</code>
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folder in the template directory. So if you have a flow block model
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named <code>text</code> it will render from <code>templates/blocks/text.html</code>.</p>
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<p>Within a template a flow block has access to all the variables that you would
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expect. <code>this</code> points to the current block and <code>record</code> points to the record
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the block is contained in.</p>
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<p>This is a simple example of a typical template of a flow block:</p>
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<div class="hll"><pre><span></span><span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"text-block text-block-</span><span class="cp">{{</span> <span class="nv">this.class</span> <span class="cp">}}</span><span class="s">"</span><span class="p">></span>
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<span class="cp">{{</span> <span class="nv">this.text</span> <span class="cp">}}</span>
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<span class="p"></</span><span class="nt">div</span><span class="p">></span>
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</pre></div>
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<p>Some more involved templates might also refer back to the page to do something
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with it. Here for instance is a simple flow block for including a thumbnail
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of an attached image:</p>
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<div class="hll"><pre><span></span><span class="cp">{%</span> <span class="k">set</span> <span class="nv">img</span> <span class="o">=</span> <span class="nv">record.attachments.images.get</span><span class="o">(</span><span class="nv">this.image</span><span class="o">)</span> <span class="cp">%}</span>
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<span class="cp">{%</span> <span class="k">if</span> <span class="nv">img</span> <span class="cp">%}</span>
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<span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"thumbnail-block"</span><span class="p">></span>
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<span class="p"><</span><span class="nt">img</span> <span class="na">src</span><span class="o">=</span><span class="s">"</span><span class="cp">{{</span> <span class="nv">img.thumbnail</span><span class="o">(</span><span class="m">480</span><span class="o">)|</span><span class="nf">url</span> <span class="cp">}}</span><span class="s">"</span> <span class="na">alt</span><span class="o">=</span><span class="s">""</span><span class="p">></span>
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<span class="p"></</span><span class="nt">div</span><span class="p">></span>
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<span class="cp">{%</span> <span class="k">endif</span> <span class="cp">%}</span>
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</pre></div>
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<p>This also has a safeguard that if the image does not exist nothing is rendered
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instead. This is a good idea because someone could delete the attachments but
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not update the reference in the block.</p>
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<h2 id="flow-templating">Flow Templating</h2><p>The default behavior of rendering an entire flow is to render the templates
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of the individual blocks one after another. Sometimes that is not flexible
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enough. Because of that you can access the blocks individually. This is
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particularly useful for more complex situations where you either deal with
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nested flows or where you want to wrap the individual blocks somehow.</p>
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<p>For instance in this case the blocks are wrapped before rendering:</p>
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<div class="hll"><pre><span></span><span class="cp">{%</span> <span class="k">for</span> <span class="nv">blk</span> <span class="k">in</span> <span class="nv">this.demo_flow.blocks</span> <span class="cp">%}</span>
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<span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"block block-</span><span class="cp">{{</span> <span class="nv">blk._flowblock</span> <span class="cp">}}</span><span class="s">"</span><span class="p">></span>
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<span class="cp">{{</span> <span class="nv">blk</span> <span class="cp">}}</span>
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<span class="p"></</span><span class="nt">div</span><span class="p">></span>
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<span class="cp">{%</span> <span class="k">endfor</span> <span class="cp">%}</span>
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</pre></div>
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<p>The <code>_flowblock</code> field is always available on a flow block and is the name
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of the data model that defines it. This is a good way to also specifically
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customize individual blocks in a flow without having to invoke their
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templates. You can for instance completely manually render blocks without
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using their templates:</p>
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<div class="hll"><pre><span></span><span class="cp">{%</span> <span class="k">for</span> <span class="nv">blk</span> <span class="k">in</span> <span class="nv">this.demo_flow.blocks</span> <span class="cp">%}</span>
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<span class="cp">{%</span> <span class="k">if</span> <span class="nv">blk._flowblock</span> <span class="o">==</span> <span class="s1">'text'</span> <span class="cp">%}</span>
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<span class="p"><</span><span class="nt">p</span><span class="p">></span><span class="cp">{{</span> <span class="nv">blk.text</span> <span class="cp">}}</span>
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<span class="cp">{%</span> <span class="k">elif</span> <span class="nv">blk._flowblock</span> <span class="o">==</span> <span class="s1">'image'</span> <span class="cp">%}</span>
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<span class="p"><</span><span class="nt">img</span> <span class="na">src</span><span class="o">=</span><span class="s">"</span><span class="cp">{{</span> <span class="nv">blk.image</span> <span class="cp">}}</span><span class="s">"</span> <span class="na">alt</span><span class="o">=</span><span class="s">"</span><span class="cp">{{</span> <span class="nv">blk.alt</span> <span class="cp">}}</span><span class="s">"</span><span class="p">></span>
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<span class="cp">{%</span> <span class="k">endif</span> <span class="cp">%}</span>
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<span class="cp">{%</span> <span class="k">endfor</span> <span class="cp">%}</span>
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</pre></div>
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