title: Client-side page rendering, good or bad (PHP + Javascript\AJAX)
body: <p>I am designing the back-end for a web application.  I am in a situation where I am unable to collaborate with the front end developer.  I also do not like inline HTML\PHP and am not in a position to integrate a template.  My solution is that I would keep the front end completely separate from the back-end.  The front end would communicate with the back end via AJAX (or jQuery).  For example the file upload system would work like this:</p>
  
  <pre><code>        &lt;?
  
              //Do stuff
              if(!isUserLoggedIn())
                  die("0-Must be logged in");
  
              //Do more
              if(!fileIsTooBigOrNotTheRightType()) {
                  die("0-Bad files");
              }
  
              //Do even more
              if(!move_uploaded_file($src,$dst) {
                  die("0-directory error");
              }
  
              echo "1-Success";
  
          ?&gt;
  </code></pre>
  
  <p>The front end developer will simply AJAX the file to upload.php and interpret the response and take the appropriate action on the front end (Show the form, red out some fields, display an error message, redirect to the login form, etc.)</p>
  
  <p>To reduce the number of HTTP queries each page may contain a hidden field with JSON data containing the dynamic elements that will be in place.  For example on a private messaging system's inbox page the JSON string may include things such as the number of new messages, who each message is from, and the subject.  The front end developer will be able to parse that data and use it any way he likes and is free to create a user friendly interface independent of me.</p>
  
  <p>It is 2012 and I don't think it is wrong to assume the client's have javascript with AJAX support.</p>
  
  <p>TLDR: I am shifting the work of rendering the page (putting elements in their place) to client side javascript.  From an efficiency standpoint is this good or bad?  It seems like less work the server has to do.</p>