JavaScript display PDF in the browser using Ajax call

In this article, you will learn how to display PDF in the browser using Ajax call.

Ajax provides the ability to dynamically change portions of a web page without reloading the complete web page. Some portions of a web page are static, like the header, footer, menus, that need to be reload when the user interacts with the page. The reloading of the page takes extra user time. You have experienced that when you click on some request, that page may hang because a lot of information is trying to load at once.

Ajax provides a facility to dynamically updates some portion of a web page without disturbing or reloading the other portions of the web page. For this, we just have to develop a container to display output from a program hosted on a web server. Here is the basic example to display PDF files within the web page content using AJAX call.

JavaScript display PDF in the browser using Ajax call

index.html

First, we have created a main HTML file that we will call on the browser. This file contains basic HTML code. We have added a button 'Click Here'. When the user clicks on this, it calls a Javascript function 'ajaxRequest()'. In the header section of this page, we have included one style sheet file 'style.css' and one javascript file 'ajax.js' -

<html>
 <head> 
  <title>Javascript Ajax Demo</title>
  <meta charset="utf-8">
  <link href="style.css" rel="stylesheet">
  <script type='text/javascript' src='ajax.js'></script>
 </head>
<body>
 <div id="wrapper">
 <div id="header"> 
 <h1>Welcome to eTutorialsPoint</h1> 
 </div>
 <div id="content"> 
 <h2>Information</h2>
 <p>You can view the information in detail on click the below button-</p>
 <br/>
 <input type='button' onclick='ajaxRequest();' value='Click Here'/>
 <br/>
 
 <div id='getAjaxResponse'>
 When you click the above button, this section changes and load PDF file.
 </div> 
 </div>
 <div id="footer">
 Copyright © 2019 etutorialspoint.com
 </div>
 
 </div> 
</body>
</html>

style.css

Here is the stylesheet 'style.css' to enhance the user interface, that we have included in the above 'index.html' file.

body { background-color: #CCCCCC ;
font-family: Arial, Verdana, sans-serif; }
h1 { margin: 10px; }
h2 { color: #000000;
font-family: Arial, sans-serif; }
#wrapper { margin: 0 auto;
width: 85%;
min-width: 800px;
background-color: #0093D1;
color: #000066; }
#header { background-color: #0093D1;
color: #00005D; }
#content { background-color: #ffffff;
color: #000000;
padding: 10px 20px;
overflow: auto; }
#footer { font-size: 80%;
text-align: center;
padding: 5px;
background-color: #0093D1;
color: #ffffff;
clear: both;}

ajax.js

Here is the javascript 'ajax.js' file, that we have called on 'index.html' page.

function getXMLHttp()
{
 var xmlHttp;
 try
 {
  xmlHttp = new XMLHttpRequest();
 }
 catch(e)
 {
  //Internet Explorer is different than the others
  try
  {
   xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
  }
  catch(e)
  {
   try
   {
    xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
   }
   catch(e)
   {
    alert("You have Old Browser! Please update to use AJAX call.")
    return false;
   }
 }
}
return xmlHttp;
}

function ajaxRequest()
{
 var xmlHttp = getXMLHttp();
 xmlHttp.onreadystatechange = function()
 {
 if(xmlHttp.readyState == 4)
 {
  handleResponse(xmlHttp.responseText);
 }
 }
xmlHttp.open("GET", "doc.html", true);
xmlHttp.send(null);
}

function handleResponse(response)
{
document.getElementById('getAjaxResponse').innerHTML = response;
}

doc.html

Here is the HTML file that has an embedded PDF file using the iframe element. The whole of the HTML page content will be placed within the div id 'getAjaxResponse' on Ajax call.

<h1>Here is the detail information in PDF</h1>
<iframe src="document/etp.pdf" width="90%" height="500px">
</iframe>

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