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| <h1 class="content-header header-section1" id="pgui_misc_var" itemprop="headline">Variables, scopes</h1> |
| </div></div><p>This chapter explains what happens when a template tries to |
| access a variable, and how the variables are stored.</p><p>When you call <code class="inline-code">Template.process</code> it will |
| internally create an <code class="inline-code">Environment</code> object that will |
| be in use until <code class="inline-code">process</code> returns. This object stores |
| the runtime state of template processing. Among other things, it |
| stores the variables created by the template with directives like |
| <code class="inline-code">assign</code>, <code class="inline-code">macro</code>, |
| <code class="inline-code">local</code> or <code class="inline-code">global</code>. It never tries |
| to modify the data-model object that you pass to the |
| <code class="inline-code">process</code> call, nor does it create or replace shared |
| variables stored in the configuration.</p><p>When you try to read a variable, FreeMarker will seek the |
| variable in this order, and stops when it finds a variable with the |
| right name:</p><div class="orderedlist"><ol type="1"> |
| <li> |
| <p>In the Environment:</p> |
| |
| <div class="orderedlist"><ol type="1"> |
| <li> |
| <p>If you are in a loop, in the set of loop variables. Loop |
| variables are the variables created by directives like |
| <code class="inline-code">list</code>.</p> |
| </li> |
| |
| <li> |
| <p>If you are inside a macro, in the local variable set of |
| the macro. Local variables can be created with the |
| <code class="inline-code">local</code> directive. Also, the parameters of |
| macros are local variables.</p> |
| </li> |
| |
| <li> |
| <p>In the current <a href="dgui_misc_namespace.html">namespace</a>. You can put |
| variables into a namespace with the <code class="inline-code">assign</code> |
| directive.</p> |
| </li> |
| |
| <li> |
| <p>In the set of variables created with |
| <code class="inline-code">global</code> directive. FTL handles these |
| variables as if they were normal members of the data-model. |
| That is, they are visible in all namespaces, and you can |
| access them as if they would be in the data-model.</p> |
| </li> |
| </ol></div> |
| </li> |
| |
| <li> |
| <p>In the data-model object you have passed to the |
| <code class="inline-code">process</code> method</p> |
| </li> |
| |
| <li> |
| <p>In the set of shared variables stored in the |
| <code class="inline-code">Configuration</code></p> |
| </li> |
| </ol></div><p>In practice, from the viewpoint of template authors these 6 |
| layers are only 4 layers, since from that viewpoint the last 3 layers |
| (variables created with <code class="inline-code">global</code>, the actual |
| data-model object, shared variables) together constitute the set of |
| global variables.</p><p>Note that it is possible to get variables from a specific layer |
| in FTL with <a href="ref_specvar.html">special |
| variables</a>.</p><div class="bottom-pagers-wrapper"><div class="pagers bottom"><a class="paging-arrow previous" href="pgui_misc.html"><span>Previous</span></a><a class="paging-arrow next" href="pgui_misc_charset.html"><span>Next</span></a></div></div></div></div> </div> |
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