[javascript] Show popup after page load

I created a jQuery popup by following an online tutorial.

I want to show this popup after page load/after page load it appears + how to code it as like it appears after 5 second of page load.

Due to my low knowledge on jQuery I am not able to make it work as of my requirements.

Any idea how to do it?

function PopUp(){
    document.getElementById('ac-wrapper').style.display="none"; 
}

#ac-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,.6);
    z-index: 1001;
}

#popup {
    width: 555px;
    height: 375px;
    background: #FFFFFF;
    border: 5px solid #000;
    border-radius: 25px;
    -moz-border-radius: 25px;
    -webkit-border-radius: 25px;
    box-shadow: #64686e 0px 0px 3px 3px;
    -moz-box-shadow: #64686e 0px 0px 3px 3px;
    -webkit-box-shadow: #64686e 0px 0px 3px 3px;
    position: relative;
    top: 150px; left: 375px;
}

<div id="ac-wrapper">
    <div id="popup">
        <center>
            <h2>Popup Content Here</h2>
            <input type="submit" name="submit" value="Submit" onClick="PopUp()" />
        </center>
    </div>
</div>

<p>Page Content Here......</p>

  <script type="text/javascript">
  jQuery(document).ready(function(){
         setTimeout(PopUp(),5000); // invoke Popup function after 5 seconds 
  });
   </script>

    <script type="text/javascript">
        $(window).on('load',function(){
            setTimeout(function(){ alert(" //show popup"); }, 5000); 
        });
    </script>

You can also do this much easier with a plugin called jQuery-confirm. All you have to do is add the script tag and the style sheet they provide in your page

<link rel="stylesheet" 
href="https://cdnjs.cloudflare.com/ajax/libs/jquery-
confirm/3.3.0/jquery-confirm.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-
confirm/3.3.0/jquery-confirm.min.js"></script>

And then an example of calling the alert box is:

   <script>
        $.alert({
    title: 'Alert!',
    content: 'Simple alert!',
     });

If you don't want to use jquery, use this:

<script>
 // without jquery
document.addEventListener("DOMContentLoaded", function() {
 setTimeout(function() {
  // run your open popup function after 5 sec = 5000
  PopUp();
 }, 5000)
});
</script>

OR With jquery

<script>
  $(document).ready(function(){
   setTimeout(function(){
   // open popup after 5 seconds
   PopUp();
  },5000);  
 });
</script>

try something like this

<script type="text/javascript">
function PopUp(hideOrshow) {
    if (hideOrshow == 'hide') document.getElementById('ac-wrapper').style.display = "none";
    else document.getElementById('ac-wrapper').removeAttribute('style');
}
window.onload = function () {
    setTimeout(function () {
        PopUp('show');
    }, 5000);
}
</script>

and your html

<div id="ac-wrapper" style='display:none'>
    <div id="popup">
        <center>
             <h2>Popup Content Here</h2>    
            <input type="submit" name="submit" value="Submit" onClick="PopUp('hide')" />
        </center>
    </div>
</div>

Demo JsFiddle

Use this below code to display pop-up box on page load:

$(document).ready(function() { 
  var id = '#dialog';
  var maskHeight = $(document).height();
  var maskWidth = $(window).width();
  $('#mask').css({'width':maskWidth,'height':maskHeight}); 
  $('#mask').fadeIn(500); 
  $('#mask').fadeTo("slow",0.9); 
        var winH = $(window).height();
  var winW = $(window).width();
        $(id).css('top',  winH/2-$(id).height()/2);
  $(id).css('left', winW/2-$(id).width()/2);
     $(id).fadeIn(2000);  
     $('.window .close').click(function (e) {
  e.preventDefault();
  $('#mask').hide();
  $('.window').hide();
     });  
     $('#mask').click(function () {
  $(this).hide();
  $('.window').hide();
 });  

});

<div class="maintext">
<h2> Main text goes here...</h2>
</div>
<div id="boxes">
<div style="top: 50%; left: 50%; display: none;" id="dialog" class="window"> 
<div id="san">
<a href="#" class="close agree"><img src="close-icon.png" width="25" style="float:right; margin-right: -25px; margin-top: -20px;"></a>
<img src="san-web-corner.png" width="450">
</div>
</div>
<div style="width: 2478px; font-size: 32pt; color:white; height: 1202px; display: none; opacity: 0.4;" id="mask"></div>
</div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.js"></script> 

I refereed this code from here Demo