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How to display a popup box with a loading graphic while the browser is waiting for the server to respond.

Product: Presto Type: How to

This article will assume you just want to add the loading graphic to a single screen; for instance, while waiting for the server to process a credit card payment.

To add a simple popup box to the screen with the text 'Loading...', add the following JavaScript to your screen's Page-Level JavaScript:

jQuery(document).one("SendRequest", function(e, sCmd) {
	var sPopup = '<div id="loadingpopup">Loading...</div>';

The JavaScript on its own will not make the text a popup box. For that, we need to add the following to your stylesheet.css file:

	/* create the border effect */
	-webkit-box-shadow: -2px 4px 9px 0px #000000 ;
	-moz-box-shadow: -2px 4px 9px 0px #000000 ;
	box-shadow: -2px 4px 9px 0px #000000 ;
	border-radius: 2px;
	-moz-border-radius: 2px;
	-webkit-border-radius: 2px;
	border: 1px solid #ffffff;
	/* center the popup on the screen. You may need to adjust these settings for mobile. */
	position: absolute;
	left: 0;
	right: 0;
	margin-left: auto;
	margin-right: auto;
	top: 0;
	bottom: 0;
	margin-top: auto;
	margin-bottom: auto;
	/* width and height of the popup box */
	width: 250px;
	height: 100px;
	/* background color of the box */
	background-color: white;
	/* center the text horizontally and vertically */
	text-align: center;
	line-height: 90px;

If you prefer to display a loading graphic, you can do this in a number of different ways. We will discuss 2 possibilities.

The first option involves linking to an animated GIF.

You can download animated GIFs from various websites like this: https://icons8.com/preloaders/

To use the GIF, modify your JavaScript to look like the this:

jQuery(document).one("SendRequest", function(e, sCmd) {
	var sPopup = '<div id="loadingpopup"></div>';
	var sImage = '<img src="http://esdi.excelsystems.com/esdiapps/kb_files/loadinggraphic.gif" height="99px" width="99px"></img>';

You'll need to replace the SRC link with your own image.


The other option we will discuss for the loading graphic is building your own from JavaScript and CSS.

The following code example is taken with minor modifications from http://tobiasahlin.com/spinkit/

 From the last JavaScript code snippet above, change the var sImage line to read as follows:

var sImage = '<div class="sk-circle"><div class="sk-circle1 sk-child"></div><div class="sk-circle2 sk-child"></div><div class="sk-circle3 sk-child"></div><div class="sk-circle4 sk-child"></div><div class="sk-circle5 sk-child"></div><div class="sk-circle6 sk-child"></div><div class="sk-circle7 sk-child"></div><div class="sk-circle8 sk-child"></div><div class="sk-circle9 sk-child"></div><div class="sk-circle10 sk-child"></div><div class="sk-circle11 sk-child"></div><div class="sk-circle12 sk-child"></div></div>';

Then add the following CSS to stylesheet.css to control the animation:

.sk-circle {
  margin: auto auto;
  width: 100px;
  height: 100px;
  position: relative;
.sk-circle .sk-child {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
.sk-circle .sk-child:before {
  content: '';
  display: block;
  margin: 0 auto;
  width: 15%;
  height: 15%;
  background-color: #333;
  border-radius: 100%;
  -webkit-animation: sk-circleBounceDelay 1.2s infinite ease-in-out both;
          animation: sk-circleBounceDelay 1.2s infinite ease-in-out both;
.sk-circle .sk-circle2 {
  -webkit-transform: rotate(30deg);
      -ms-transform: rotate(30deg);
          transform: rotate(30deg); }
.sk-circle .sk-circle3 {
  -webkit-transform: rotate(60deg);
      -ms-transform: rotate(60deg);
          transform: rotate(60deg); }
.sk-circle .sk-circle4 {
  -webkit-transform: rotate(90deg);
      -ms-transform: rotate(90deg);
          transform: rotate(90deg); }
.sk-circle .sk-circle5 {
  -webkit-transform: rotate(120deg);
      -ms-transform: rotate(120deg);
          transform: rotate(120deg); }
.sk-circle .sk-circle6 {
  -webkit-transform: rotate(150deg);
      -ms-transform: rotate(150deg);
          transform: rotate(150deg); }
.sk-circle .sk-circle7 {
  -webkit-transform: rotate(180deg);
      -ms-transform: rotate(180deg);
          transform: rotate(180deg); }
.sk-circle .sk-circle8 {
  -webkit-transform: rotate(210deg);
      -ms-transform: rotate(210deg);
          transform: rotate(210deg); }
.sk-circle .sk-circle9 {
  -webkit-transform: rotate(240deg);
      -ms-transform: rotate(240deg);
          transform: rotate(240deg); }
.sk-circle .sk-circle10 {
  -webkit-transform: rotate(270deg);
      -ms-transform: rotate(270deg);
          transform: rotate(270deg); }
.sk-circle .sk-circle11 {
  -webkit-transform: rotate(300deg);
      -ms-transform: rotate(300deg);
          transform: rotate(300deg); }
.sk-circle .sk-circle12 {
  -webkit-transform: rotate(330deg);
      -ms-transform: rotate(330deg);
          transform: rotate(330deg); }
.sk-circle .sk-circle2:before {
  -webkit-animation-delay: -1.1s;
          animation-delay: -1.1s; }
.sk-circle .sk-circle3:before {
  -webkit-animation-delay: -1s;
          animation-delay: -1s; }
.sk-circle .sk-circle4:before {
  -webkit-animation-delay: -0.9s;
          animation-delay: -0.9s; }
.sk-circle .sk-circle5:before {
  -webkit-animation-delay: -0.8s;
          animation-delay: -0.8s; }
.sk-circle .sk-circle6:before {
  -webkit-animation-delay: -0.7s;
          animation-delay: -0.7s; }
.sk-circle .sk-circle7:before {
  -webkit-animation-delay: -0.6s;
          animation-delay: -0.6s; }
.sk-circle .sk-circle8:before {
  -webkit-animation-delay: -0.5s;
          animation-delay: -0.5s; }
.sk-circle .sk-circle9:before {
  -webkit-animation-delay: -0.4s;
          animation-delay: -0.4s; }
.sk-circle .sk-circle10:before {
  -webkit-animation-delay: -0.3s;
          animation-delay: -0.3s; }
.sk-circle .sk-circle11:before {
  -webkit-animation-delay: -0.2s;
          animation-delay: -0.2s; }
.sk-circle .sk-circle12:before {
  -webkit-animation-delay: -0.1s;
          animation-delay: -0.1s; }

@-webkit-keyframes sk-circleBounceDelay {
  0%, 80%, 100% {
    -webkit-transform: scale(0);
            transform: scale(0);
  } 40% {
    -webkit-transform: scale(1);
            transform: scale(1);

@keyframes sk-circleBounceDelay {
  0%, 80%, 100% {
    -webkit-transform: scale(0);
            transform: scale(0);
  } 40% {
    -webkit-transform: scale(1);
            transform: scale(1);

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