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How To Add Percentage (%) Loader To Your Site

By Anshuman Trivedi on 2/13/2017

Recently in my current project there was a requirement of client to add Percentage Loader while the components of site is loading.

I thought of writing this function to add Percentage Loader .

 

Step1:   HTML part -

<html>

<head>

</head>

<body>

      <div id="overlay">

                <div id="progstat"></div>

                <div id="progress"></div>

      </div>

      <div id="containerdd">

                  // all page data

       </div>

</body>

</html>

Step2:  Add CSS -

 

 <style>

docFile{width:32.2%;}

#overlay{position:fixed; z-index:99999; top:0; left:0; bottom:0; right:0; background:rgba(0,0,0,0.9); transition: 1s 0.4s;}

#progress{height:1px; background:#fff; position:absolute; width:0; top:50%;}

#progstat{font-size:0.7em; letter-spacing: 3px; position:absolute; top:50%; margin-top:-40px; width:100%; text-align:center; color:#fff;}

</style>

 

Step3:   Write Script-

 

  <script>

;(function(){

  function id(v){return document.getElementById(v); }

  function loadbar() {

    var ovrl = id("overlay"),

        prog = id("progress"),

        stat = id("progstat"),

        docFile = document.images,

        c = 0;

        tot = docFile.length;

 

    function documentLoaded(){

      c += 1;

      var perc = ((100/tot*c) << 0) +"%";

      prog.style.width = perc;

      stat.innerHTML = "Loading "+ perc;

      if(c===tot) return doneLoading();

    }

    function doneLoading(){

      ovrl.style.opacity = 0;

      setTimeout(function(){

        ovrl.style.display = "none";

      }, 1200);

    }

    for(var i=0; i<tot; i++) {

      var tDocumentData     = new Image();

      tDocumentData.onload  = documentLoaded;

      tDocumentData.onerror = documentLoaded;

      tDocumentData.src     = docFile[i].src;

    }   

  }

  document.addEventListener('DOMContentLoaded', loadbar, false);

}());

</script>

 

Step4-  Save and Publish .

CSS
Javascript
HTML 5
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