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<h1 id="extension-development">Extension development<a class="headerlink" href="#extension-development" title="Permanent link">&para;</a></h1>
<h2 id="requirements-for-an-extension">Requirements for an extension<a class="headerlink" href="#requirements-for-an-extension" title="Permanent link">&para;</a></h2>
<p>As of version 7.0, extensions are <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes">JavaScript Classes</a>. An extension must implement:</p>
<ul>
<li><a href="#constructor">A <code>constructor()</code></a> that accepts an instance of jsPsych.</li>
<li><a href="#initialize">An <code>initialize()</code> function</a> to handle the initialize event of the extension.</li>
<li><a href="#on_start">An <code>on_start()</code> function</a> to handle the on_start event of the extension.</li>
<li><a href="#on_load">An <code>on_load()</code> function</a> to handle the on_load event of the extension.</li>
<li><a href="#on_finish">An <code>on_finish()</code> function</a> to handle the on_finish event of the extension and store data that the extension collects.</li>
<li><a href="#static-info">A static <code>info</code></a> property containing a unique name for the extension.</li>
</ul>
<h3 id="templates">Templates<a class="headerlink" href="#templates" title="Permanent link">&para;</a></h3>
<p>Plugins can be written in either plain JavaScript or in TypeScript. Template files for both <a href="https://github.com/jspsych/jspsych-contrib/blob/main/packages/extension-template/index.js">JavaScript</a> and <a href="https://github.com/jspsych/jspsych-contrib/blob/main/packages/extension-template-ts/src/index.ts">TypeScript</a> are available in the <a href="https://github.com/jspsych/jspsych-contrib/">jspsych-contrib repository</a>.</p>
<h2 id="extension-components">Extension components<a class="headerlink" href="#extension-components" title="Permanent link">&para;</a></h2>
<h3 id="constructor">constructor()<a class="headerlink" href="#constructor" title="Permanent link">&para;</a></h3>
<p>The extension's <code>constructor()</code> will be passed a reference to the instance of the <code>JsPsych</code> class that is running the experiment. The constructor should store this reference so that the plugin can access functionality from the core library and its modules.</p>
<div class="highlight"><pre><span></span><code><span class="kr">class</span> <span class="nx">MyAwesomeExtension</span> <span class="p">{</span>
<span class="nx">constructor</span><span class="p">(</span><span class="nx">jsPsych</span><span class="p">){</span>
<span class="k">this</span><span class="p">.</span><span class="nx">jsPsych</span> <span class="o">=</span> <span class="nx">jsPsych</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="initialize">initialize()<a class="headerlink" href="#initialize" title="Permanent link">&para;</a></h3>
<p>The <code>initialize()</code> function is called when an instance of jsPsych is first initialized, either through <code>initJsPsych()</code> or <code>new JsPsych()</code>. This is where setup code for the extension should be run. This event will happen once per experiment, unlike the other events which occur with each trial. The <code>params</code> object can include whatever parameters are necessary to configure the extension. The <code>params</code> object is passed from the call to <code>initJsPsych()</code> to <code>initialize()</code> method. <code>initialize()</code> must return a <code>Promise</code> that resolves when the extension is finished initializing. </p>
<div class="highlight"><pre><span></span><code><span class="c1">//... experiment code ...//</span>
<span class="kd">let</span> <span class="nx">jsPsych</span> <span class="o">=</span> <span class="nx">initJsPsych</span><span class="p">({</span>
<span class="nx">extensions</span><span class="o">:</span> <span class="p">[</span>
<span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="nx">myAwesomeExtension</span><span class="p">,</span> <span class="nx">params</span><span class="o">:</span> <span class="p">{</span><span class="nx">demo</span><span class="o">:</span> <span class="s1">&#39;value&#39;</span><span class="p">}}</span>
<span class="p">]</span>
<span class="p">});</span>
<span class="c1">//... extension code ...//</span>
<span class="kr">class</span> <span class="nx">MyAwesomeExtension</span> <span class="p">{</span>
<span class="nx">initialize</span><span class="p">(</span><span class="nx">params</span><span class="p">){</span>
<span class="k">return</span> <span class="k">new</span> <span class="nb">Promise</span><span class="p">((</span><span class="nx">resolve</span><span class="p">,</span> <span class="nx">reject</span><span class="p">)=&gt;{</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">params</span><span class="p">.</span><span class="nx">demo</span><span class="p">);</span> <span class="c1">// will output &#39;value&#39;</span>
<span class="nx">resolve</span><span class="p">();</span> <span class="c1">// finish initialzing</span>
<span class="p">})</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="on_start">on_start()<a class="headerlink" href="#on_start" title="Permanent link">&para;</a></h3>
<p><code>on_start()</code> is called at the start of the plugin execution, prior to calling <code>plugin.trial</code>. This is where trial-specific initialization can happen, such as creating empty containers to hold data or resetting internal state. The <code>params</code> object is passed from the declaration of the extension in the trial object. You can use <code>params</code> to customize the behavior of the extension for each trial.</p>
<div class="highlight"><pre><span></span><code><span class="c1">//... experiment code ...//</span>
<span class="kd">let</span> <span class="nx">trial</span> <span class="o">=</span> <span class="p">{</span>
<span class="nx">type</span><span class="o">:</span> <span class="nx">htmlKeyboardResponse</span><span class="p">,</span>
<span class="nx">stimulus</span><span class="o">:</span> <span class="s2">&quot;You&#39;re awesome!&quot;</span><span class="p">,</span>
<span class="nx">extensions</span><span class="o">:</span> <span class="p">[</span>
<span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="nx">myAwesomeExtension</span><span class="p">,</span> <span class="nx">params</span><span class="o">:</span> <span class="p">{</span><span class="nx">demo</span><span class="o">:</span> <span class="s1">&#39;value&#39;</span><span class="p">}}</span>
<span class="p">]</span>
<span class="p">});</span>
<span class="c1">//... extension code ...//</span>
<span class="kr">class</span> <span class="nx">MyAwesomeExtension</span> <span class="p">{</span>
<span class="nx">initialize</span><span class="p">(</span><span class="nx">params</span><span class="p">){</span> <span class="p">...</span> <span class="p">}</span>
<span class="nx">on_start</span><span class="p">(</span><span class="nx">params</span><span class="p">){</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">params</span><span class="p">.</span><span class="nx">demo</span><span class="p">);</span> <span class="c1">// outputs &#39;value&#39; before the trial begins.</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="on_load">on_load()<a class="headerlink" href="#on_load" title="Permanent link">&para;</a></h3>
<p><code>on_load()</code> is called after the <code>on_load</code> event for the plugin has completed, which is typically when the plugin has finished executing initial DOM-modifying code and has set up various event listeners. This is where the extension can begin actively interacting with the DOM and recording data. The <code>params</code> object is passed from the declaration of the extension in the trial object. You can use <code>params</code> to customize the behavior of the extension for each trial.</p>
<div class="highlight"><pre><span></span><code><span class="c1">//... experiment code ...//</span>
<span class="kd">let</span> <span class="nx">trial</span> <span class="o">=</span> <span class="p">{</span>
<span class="nx">type</span><span class="o">:</span> <span class="nx">htmlKeyboardResponse</span><span class="p">,</span>
<span class="nx">stimulus</span><span class="o">:</span> <span class="s2">&quot;You&#39;re awesome!&quot;</span><span class="p">,</span>
<span class="nx">extensions</span><span class="o">:</span> <span class="p">[</span>
<span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="nx">myAwesomeExtension</span><span class="p">,</span> <span class="nx">params</span><span class="o">:</span> <span class="p">{</span><span class="nx">demo</span><span class="o">:</span> <span class="s1">&#39;value&#39;</span><span class="p">}}</span>
<span class="p">]</span>
<span class="p">});</span>
<span class="c1">//... extension code ...//</span>
<span class="kr">class</span> <span class="nx">MyAwesomeExtension</span> <span class="p">{</span>
<span class="nx">initialize</span><span class="p">(</span><span class="nx">params</span><span class="p">){</span> <span class="p">...</span> <span class="p">}</span>
<span class="nx">on_start</span><span class="p">(</span><span class="nx">params</span><span class="p">){</span> <span class="p">...</span> <span class="p">}</span>
<span class="nx">on_load</span><span class="p">(</span><span class="nx">params</span><span class="p">){</span>
<span class="c1">// replaces the contents of the display with &#39;value&#39;;</span>
<span class="k">this</span><span class="p">.</span><span class="nx">jsPsych</span><span class="p">.</span><span class="nx">getDisplayElement</span><span class="p">().</span><span class="nx">innerHTML</span> <span class="o">=</span> <span class="nx">params</span><span class="p">.</span><span class="nx">demo</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="on_finish">on_finish()<a class="headerlink" href="#on_finish" title="Permanent link">&para;</a></h3>
<p><code>on_finish()</code> is called after the plugin invokes <code>jsPsych.finishTrial()</code>. This can be used for any teardown at the end of the trial. This method should return an object of data to append to the plugin's data. Note that this event fires <em>before</em> the <code>on_finish</code> event for the plugin, so data added by the extension is accessible in any trial <code>on_finish</code> event handlers. The <code>params</code> object is passed from the declaration of the extension in the trial object. You can use <code>params</code> to customize the behavior of the extension for each trial.</p>
<div class="highlight"><pre><span></span><code><span class="c1">//... experiment code ...//</span>
<span class="kd">let</span> <span class="nx">trial</span> <span class="o">=</span> <span class="p">{</span>
<span class="nx">type</span><span class="o">:</span> <span class="nx">htmlKeyboardResponse</span><span class="p">,</span>
<span class="nx">stimulus</span><span class="o">:</span> <span class="s2">&quot;You&#39;re awesome!&quot;</span><span class="p">,</span>
<span class="nx">extensions</span><span class="o">:</span> <span class="p">[</span>
<span class="p">{</span><span class="nx">type</span><span class="o">:</span> <span class="nx">myAwesomeExtension</span><span class="p">,</span> <span class="nx">params</span><span class="o">:</span> <span class="p">{</span><span class="nx">demo</span><span class="o">:</span> <span class="s1">&#39;value&#39;</span><span class="p">}}</span>
<span class="p">],</span>
<span class="nx">on_finish</span><span class="o">:</span> <span class="p">(</span><span class="nx">data</span><span class="p">)</span> <span class="p">=&gt;</span> <span class="p">{</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">data</span><span class="p">.</span><span class="nx">awesome</span><span class="p">);</span> <span class="c1">// will output &#39;value&#39;.</span>
<span class="p">}</span>
<span class="p">});</span>
<span class="c1">//... extension code ...//</span>
<span class="kr">class</span> <span class="nx">MyAwesomeExtension</span> <span class="p">{</span>
<span class="nx">initialize</span><span class="p">(</span><span class="nx">params</span><span class="p">){</span> <span class="p">...</span> <span class="p">}</span>
<span class="nx">on_start</span><span class="p">(</span><span class="nx">params</span><span class="p">){</span> <span class="p">...</span> <span class="p">}</span>
<span class="nx">on_load</span><span class="p">(</span><span class="nx">params</span><span class="p">){</span> <span class="p">...</span> <span class="p">}</span>
<span class="nx">on_finish</span><span class="p">(</span><span class="nx">params</span><span class="p">){</span>
<span class="k">return</span> <span class="p">{</span>
<span class="nx">awesome</span><span class="o">:</span> <span class="nx">params</span><span class="p">.</span><span class="nx">value</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="static-info">static .info<a class="headerlink" href="#static-info" title="Permanent link">&para;</a></h3>
<p>The <code>info</code> property for the class must contain an object with a <code>name</code> property that has a unique name for the extension.</p>
<div class="highlight"><pre><span></span><code><span class="kr">class</span> <span class="nx">MyAwesomeExtension</span> <span class="p">{</span>
<span class="p">}</span>
<span class="nx">MyAwesomeExtension</span><span class="p">.</span><span class="nx">info</span> <span class="o">=</span> <span class="p">{</span>
<span class="nx">name</span><span class="o">:</span> <span class="s1">&#39;awesome&#39;</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="optional-methods">Optional methods<a class="headerlink" href="#optional-methods" title="Permanent link">&para;</a></h3>
<p>The extension can also include any additional methods that are necessary for interacting with it. See the <a href="../../extensions/jspsych-ext-webgazer/">webgazer extension</a> for an example.</p>
<h2 id="advice-for-writing-extensions">Advice for writing extensions<a class="headerlink" href="#advice-for-writing-extensions" title="Permanent link">&para;</a></h2>
<p>If you are developing an extension with the aim of including it in the main jsPsych repository we encourage you to follow the <a href="/developers/contributing/#contributing-to-the-codebase">contribution guidelines</a>. </p>
<p>In general, extensions should be able to work with any plugin. They should make very few assumptions about what the DOM will contain beyond the container elements generated by jsPsych. If you are making an extension targeted at one or a small number of specific plugins, consider modifying the plugin code instead.</p>
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