jQWidgets jqxListBox dragStart Property

Last Updated : 19 Sep, 2021

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 jqxListBox is used to illustrate a jQuery ListBox widget which comprises a list of electable elements.

The dragStart property is a callback function that is invoked whenever a drag action begins. It is of type Function and its by default value is null.

Syntax:

To set the dragStart property:

$("#jqxListBox").jqxListBox({dragStart: function (item)
{
    // disable dragging of 'item2' from listbox.
    if (item.label == 'item2')
    return false;
                        
    // to enable dragging of item2 from listbox.
    return true;
}
});

To get the dragStart property:

var dragStart = $('#jqxListBox').jqxListBox('dragStart');

Linked Files: Download jQWidgets from the 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/jqx-all.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxcore.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxbuttons.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxscrollbar.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxlistbox.js”></script>

Example: The below example illustrates the jqxListBox dragStart property in jQWidgets.

HTML

<html> 
  <head> 
    <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/jqx-all.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqxcore.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqxbuttons.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqxscrollbar.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqxlistbox.js"> 
    </script> 
  </head> 
  <body> 
    <center> 
      <h1 style="color: green;"> 
        GeeksforGeeks 
      </h1> 
  
      <h3> 
        jQWidgets jqxListBox  
        dragStart Property 
      </h3> 
  
      <div id="jqxLB"></div> 
      <br /> 
      <div id="log"></div> 
    </center> 
  
    <script type="text/javascript"> 
      $(document).ready(function () { 
        var data =  
            ["CS", "CSS", "C++", "Java", "Scala"]; 
  
        $("#jqxLB").jqxListBox({ 
          source: data, 
          allowDrop: true, 
          allowDrag: true, 
          width: "210px", 
          height: "100px", 
          dragStart: function (i) { 
            $("#log").text( 
              "Dragging item: " + i.label 
            ); 
          }, 
        }); 
      }); 
    </script> 
  </body> 
</html>