title: How to supress `This document is trying to print. Do you want to allow this?`
body: <p>I create a pdf from a php script and want this pdf to print itself as soon as user opens it. Without any more interaction. For this I found out, that I can add a javascript which can make the print automatical, and theoretically even without any popup windows or alerts.</p>
  
  <p>I tried all combinations of javascript to embed which I could find on all forums, i.e.,:</p>
  
  <ol>
  <li><p>Setting interactionLevel to silent or automatic.</p>
  
  <p><code>$script = "var pp = getPrintParams();
  pp.interactive = pp.constants.interactionLevel.silent;
  this.print(pp);"</code></p></li>
  <li><p>Old style:</p></li>
  </ol>
  
  <p><code>$script = 'this.print({bUI: false, bSilent: true});</code></p>
  
  <ol start="3">
  <li>Setting the function to be priviledged:</li>
  </ol>
  
  <p><code>$script = "sPrint = app.trustedFunction(
  function(){ app.beginPriv(); this.print({bUI:false, bSilent:true}); app.endPriv();
  }); 
  sPrint();"</code></p>
  
  <p>I even tried to add in register the fields</p>
  
  <p><code>Acrobat Reader/DC/AVAlert/cCheckbox/cAcrobat/iWarnScriptPrintAll=1
   Acrobat Reader/DC/EWH/bExecutePrint=1</code></p>
  
  <p>But I still can't get rid of the popup alert window when I open the pdf. I tried to open it in Adobe Reader DC and also in Foxit. I get the same warning:</p>
  
  <blockquote>
    <p>This document is trying to print. Do you want to allow this?</p>
  </blockquote>
  
  <p>Does anyone know how to suppress this popup window? Thank you.</p>