jQWidgets jqxKnob dragStartAngle Property

Last Updated : 28 Nov, 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 jqxKnob is used for representing a jQuery plugin having a round shape and displaying a draggable indicator within a range of the specified values. This API can also be used in a table or matrix for showing the relative value of a field in a range of values in the specified data region.

The dragStartAngle property is used for setting or getting the degrees of the specified jqxKnob where dragging of the pointer can start.

Syntax:

For setting the dragStartAngle property.

$('#jqxKnob').jqxKnob({dragStartAngle: 60 });

For getting the dragStartAngle property.

var allowValueChangeOnClick = 
    $('#jqxKnob').jqxKnob('dragStartAngle');

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.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/jqxdraw.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxknob.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqxnumberinput.js”></script>
<script type=”text/javascript” src=”jqwidgets/jqx-all.js”></script>

Example: The below example illustrates the jQWidgets jqxKnob dragStartAngle property. In the below example, the value for the dragStartAngle property has been set to 60.

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <link rel="stylesheet" 
          href="jqwidgets/styles/jqx.base.css" 
          type="text/css"/> 
    <script type="text/javascript" 
            src="scripts/jquery.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/jqxdraw.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqxknob.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqxnumberinput.js"> 
    </script> 
    <script type="text/javascript" 
            src="jqwidgets/jqx-all.js"> 
    </script> 
</head> 
<body> 
    <center> 
        <h1 style="color:green;"> 
            GeeksforGeeks 
        </h1> 
        <h3> jQWidgets jqxKnob dragStartAngle Property </h3> 
        <div id='jqx_Knob'> 
            <center> 
                GeeksforGeeks 
            </center> 
        </div> 
        <input type="button" style="margin:65px;" 
               id="button_for_dragStartAngle"
               value="Value of the dragStartAngle property"/> 
        <div id="log"></div> 
        <script type="text/javascript"> 
            $(document).ready(function () { 
                $('#jqx_Knob').jqxKnob({ 
                    value: 5, 
                    min: 0, 
                    max: 50, 
                    dragStartAngle: 60, 
                    startAngle: 0, 
                    endAngle: 360, 
                    snapToStep: true, 
                    marks: { 
                        colorRemaining: { color: 'red' }, 
                        colorProgress: { color: 'green' }, 
                        offset: '70%', 
                        thickness: 5, 
                        size: '4%' 
                    }, 
                    labels: { 
                        offset: '85%', 
                        step: 5 
                    }, 
                    progressBar: { 
                        style: { 
                            fill: 'yellow', 
                            stroke: 'black' 
                        }, 
                        size: '8%', 
                        offset: '61%', 
                        background: { fill: 'black' } 
                    }, 
                    pointer: { 
                        type: 'arrow', 
                        style: { fill: 'green' }, 
                        size: '68%', 
                        offset: '29%', 
                        thickness: 15 
                    } 
                }); 
                $("#button_for_dragStartAngle").jqxButton({ 
                    width: 350, 
                    theme: 'energyblue' 
                }); 
                $('#button_for_dragStartAngle') 
                .jqxButton().click(function () { 
                    var value_of_dragStartAngle = 
                        $('#jqx_Knob').jqxKnob('dragStartAngle'); 
                    $("#log").html(value_of_dragStartAngle); 
                }) 
            }); 
        </script> 
    </center> 
</body> 
</html>