jQWidgets jqxQRcode invalid Event

Last Updated : 22 Sep, 2022

jQWidgets is a JavaScript framework for making web-based applications for PC and mobile devices. It is a very powerful, optimized, platform-independent, and widely supported framework. The jqxQRcode is in version 14 of jQWidgets and is used to indicate a widget that can display QR codes as well as possesses API in order to approve, export, and also personalize them.

The invalid event is activated whenever the value of the displayed jqxQRcode is not valid.

Syntax:

$('Selector').on("invalid ", function (event) {
   // Code
});

Linked Files: Download jQWidgets from the given link. In the HTML file, locate the script files in the downloaded folder.

<link rel=”stylesheet” href=”jqwidgets/styles/jqx.base.css” type=”text/css” />
<script type=”text/javascript” src=”scripts/jquery-1.11.1.min.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxcore.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxqrcode.js”> </script>
<script type=”text/javascript” src=”jqwidgets/jqxbuttons.js”> </script>

Example 1: The below example illustrates the jqxQRcode invalid event in jQWidgets.

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <link rel="stylesheet" 
          href="jqwidgets/styles/jqx.base.css" 
          type="text/css"/> 
    <script type="text/javascript" 
            src="jqwidgets/jqxcore.js"> 
    </script> 
      <script type="text/javascript" 
        src="scripts/jquery-1.11.1.min.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqxqrcode.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqxbuttons.js"> 
    </script> 
</head> 
  
<body> 
    <center> 
        <h1 style="color:green"> 
            GeeksforGeeks 
        </h1> 
  
        <h3> 
              jQWidgets jqxQRcode invalid Event 
          </h3> 
        <div id="jqxq"></div> 
        <div id="log"></div> 
    </center> 
    <script type="text/javascript"> 
        $(document).ready(function () { 
            $("#jqxq").jqxQRcode({ 
                value: "code128a", 
            }); 
            $("#jqxq").on('invalid', function (event) { 
                $("#log").text("Triggered!"); 
            }); 
        }); 
    </script> 
</body> 
</html>

Output:

Example 2: The following is another example of the jqxQRcode invalid event in jQWidgets.

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <link rel="stylesheet" 
          href="jqwidgets/styles/jqx.base.css" 
          type="text/css"/> 
    <script type="text/javascript" 
            src="jqwidgets/jqxcore.js"> 
    </script> 
      <script type="text/javascript" 
        src="scripts/jquery-1.11.1.min.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqxqrcode.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqxbuttons.js"> 
    </script> 
</head> 
  
<body> 
    <center> 
        <h1 style="color:green"> 
            GeeksforGeeks 
        </h1> 
  
        <h3> 
              jQWidgets jqxQRcode invalid Event 
          </h3> 
        <div id="jqxq"></div><br> 
        <div id="log"></div> 
    </center> 
    
    <script type="text/javascript"> 
        $(document).ready(function () { 
            $("#jqxq").jqxQRcode({ 
                value: "gfg", 
            }); 
            $("#jqxq").on('invalid', function (event) { }); 
            var iv = $('#jqxq').jqxQRcode('isValid'); 
            if (iv === false) { 
                $('#log').text("Triggered!"); 
            } 
            else { 
                $('#log').text("Not triggered!"); 
            } 
        }); 
    </script> 
</body> 
</html>