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Polar grid
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<iframe 
    src="https://jsxgraph.uni-bayreuth.de/share/iframe/polar-grid" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Polar grid" 
    allowfullscreen
></iframe>
This code has to 
<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 1 / 1; width: 100%;" data-ar="1 / 1"></div>
</div>

<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution ShareAlike 4.0 International License.
    https://creativecommons.org/licenses/by-sa/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    var board = JXG.JSXGraph.initBoard(BOARDID, { axis: false, boundingbox: [-5, 5, 5, -5], keepaspectratio: true });
    
    // Horizontal axis with polar ticks (grid lines)
    var ax1 = board.create('axis', [[0, 0], [1, 0]], {
        ticks: {
            type: 'polar',   // Polar grid
            label: {            // Place the labels centered on the grid lines 
                offset: [0, -3],
                anchorX: 'middle',
                anchorY: 'top'
            }
        }
    });
    
    // Vertical axis with horizontal ticks
    var ax2 = board.create('axis', [[0, 0], [0, 1]], {
        ticks: {
            majorHeight: 0,      // Do not show the grid lines 
            tickEndings: [1, 0], // Let the ticks point to the left
            label: {                    // Position of the labels
                visible: true,
                offset: [-6, 0],
                anchorY: 'middle',
                anchorX: 'right'
            }
        }
    });
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution ShareAlike 4.0 International License.
https://creativecommons.org/licenses/by-sa/4.0/

Please note you have to mention 
The Center of Mobile Learning with Digital Technology
in the credits.
*/

const BOARDID = 'your_div_id'; // Insert your id here!

var board = JXG.JSXGraph.initBoard(BOARDID, { axis: false, boundingbox: [-5, 5, 5, -5], keepaspectratio: true });

// Horizontal axis with polar ticks (grid lines)
var ax1 = board.create('axis', [[0, 0], [1, 0]], {
    ticks: {
        type: 'polar',   // Polar grid
        label: {            // Place the labels centered on the grid lines 
            offset: [0, -3],
            anchorX: 'middle',
            anchorY: 'top'
        }
    }
});

// Vertical axis with horizontal ticks
var ax2 = board.create('axis', [[0, 0], [0, 1]], {
    ticks: {
        majorHeight: 0,      // Do not show the grid lines 
        tickEndings: [1, 0], // Let the ticks point to the left
        label: {                    // Position of the labels
            visible: true,
            offset: [-6, 0],
            anchorY: 'middle',
            anchorX: 'right'
        }
    }
});
<jsxgraph width="100%" aspect-ratio="1 / 1" title="Polar grid" description="This construction was copied from JSXGraph examples database: BTW HERE SHOULD BE A GENERATED LINKuseGlobalJS="false">
   /*
   This example is licensed under a 
   Creative Commons Attribution ShareAlike 4.0 International License.
   https://creativecommons.org/licenses/by-sa/4.0/
   
   Please note you have to mention 
   The Center of Mobile Learning with Digital Technology
   in the credits.
   */
   
   var board = JXG.JSXGraph.initBoard(BOARDID, { axis: false, boundingbox: [-5, 5, 5, -5], keepaspectratio: true });
   
   // Horizontal axis with polar ticks (grid lines)
   var ax1 = board.create('axis', [[0, 0], [1, 0]], {
       ticks: {
           type: 'polar',   // Polar grid
           label: {            // Place the labels centered on the grid lines 
               offset: [0, -3],
               anchorX: 'middle',
               anchorY: 'top'
           }
       }
   });
   
   // Vertical axis with horizontal ticks
   var ax2 = board.create('axis', [[0, 0], [0, 1]], {
       ticks: {
           majorHeight: 0,      // Do not show the grid lines 
           tickEndings: [1, 0], // Let the ticks point to the left
           label: {                    // Position of the labels
               visible: true,
               offset: [-6, 0],
               anchorY: 'middle',
               anchorX: 'right'
           }
       }
   });
</jsxgraph>
This example shows a custom coordinate system with polar grid lines instead of orthogonal lines. To be specific, the ticks of the horizontal axis `ax1` are of type *polar*. The ticks of the vertical axis `ax2` are horizontal as usual.
// Define the id of your board in BOARDID

var board = JXG.JSXGraph.initBoard(BOARDID, { axis: false, boundingbox: [-5, 5, 5, -5], keepaspectratio: true });

// Horizontal axis with polar ticks (grid lines)
var ax1 = board.create('axis', [[0, 0], [1, 0]], {
    ticks: {
        type: 'polar',   // Polar grid
        label: {            // Place the labels centered on the grid lines 
            offset: [0, -3],
            anchorX: 'middle',
            anchorY: 'top'
        }
    }
});

// Vertical axis with horizontal ticks
var ax2 = board.create('axis', [[0, 0], [0, 1]], {
    ticks: {
        majorHeight: 0,      // Do not show the grid lines 
        tickEndings: [1, 0], // Let the ticks point to the left
        label: {                    // Position of the labels
            visible: true,
            offset: [-6, 0],
            anchorY: 'middle',
            anchorX: 'right'
        }
    }
});

license

This example is licensed under a Creative Commons Attribution ShareAlike 4.0 International License.
Please note you have to mention The Center of Mobile Learning with Digital Technology in the credits.