title: add html&javascript code in specific Wordpress page using Plugin
body: <p>I have html&amp;javascript code that I want to add to a specific page through plugin when it installed, It's a simple Dropbox button so in this case should I use <code>add_filter()</code> function? but how to assign the page in the this image to the function <a href="https://i.stack.imgur.com/vgnCL.png" rel="nofollow noreferrer">The page of the wordpress</a></p>
  <pre><code>&lt;!DOCTYPE html&gt;
   &lt;html lang=&quot;en&quot;&gt;
  
   &lt;head&gt;
  
  
   
  
       &lt;!-- Dropbox library for importing the Dropbox button the webpage  --&gt;
       &lt;script type=&quot;text/javascript&quot; src=&quot;https://www.dropbox.com/static/api/2/dropins.js&quot; id=&quot;dropboxjs&quot;
           data-app-key=&quot;XXXXXXX&quot;&gt;&lt;/script&gt;
       
  
  
   &lt;/head&gt;
  
   &lt;body&gt;
  
       
  
       &lt;div class=&quot;dropbox_btn&quot; style=&quot;  margin: auto !important; width: 50% !important; &quot;&gt;
           &lt;!-- dropboxContainer is the id of Dropbox button which will be added in script.js file --&gt;
           &lt;div id=&quot;dropboxContainer&quot;&gt;&lt;/div&gt;
       &lt;/div&gt;
  
        
  
  
   &lt;/body&gt;
   &lt;/html&gt;
   &lt;script type=&quot;text/javascript&quot; src=&quot;script.js&quot;&gt;&lt;/script&gt;
  </code></pre>