JSXGraph
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Click on element
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<iframe 
    src="http://jsxgraph.uni-bayreuth.de/share/iframe/click-on-element" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Click on element" 
    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';

    const board = JXG.JSXGraph.initBoard(BOARDID, {
        boundingbox: [-5, 5, 5, -5],
        axis: true
    });
    
    var point = board.create('point', [1, 1], {
        size: 10
    });
    
    var txt = board.create('text', [-3, 3, 'Right click'], {
        fontSize: 24,
        visible: false
    });
    
    point.on('up', (evt) => {
        // Check for right button
        if (evt.button === 2) {
            // Show text
            txt.setAttribute({
                visible: true
            });
            // Hide text after two seconds
            setTimeout(() => txt.setAttribute({
                visible: false
            }), 2000);
        }
    });
 </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!

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

var point = board.create('point', [1, 1], {
    size: 10
});

var txt = board.create('text', [-3, 3, 'Right click'], {
    fontSize: 24,
    visible: false
});

point.on('up', (evt) => {
    // Check for right button
    if (evt.button === 2) {
        // Show text
        txt.setAttribute({
            visible: true
        });
        // Hide text after two seconds
        setTimeout(() => txt.setAttribute({
            visible: false
        }), 2000);
    }
});
<jsxgraph width="100%" aspect-ratio="1 / 1" title="Click on element" 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.
   */
   
   const board = JXG.JSXGraph.initBoard(BOARDID, {
       boundingbox: [-5, 5, 5, -5],
       axis: true
   });
   
   var point = board.create('point', [1, 1], {
       size: 10
   });
   
   var txt = board.create('text', [-3, 3, 'Right click'], {
       fontSize: 24,
       visible: false
   });
   
   point.on('up', (evt) => {
       // Check for right button
       if (evt.button === 2) {
           // Show text
           txt.setAttribute({
               visible: true
           });
           // Hide text after two seconds
           setTimeout(() => txt.setAttribute({
               visible: false
           }), 2000);
       }
   });
</jsxgraph>
JSXGraph does not watch for `click` events. Instead, the `up` event could be used. With this e.g. a right click event on an element could be realized. 
// Define the id of your board in BOARDID

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

var point = board.create('point', [1, 1], {
    size: 10
});

var txt = board.create('text', [-3, 3, 'Right click'], {
    fontSize: 24,
    visible: false
});

point.on('up', (evt) => {
    // Check for right button
    if (evt.button === 2) {
        // Show text
        txt.setAttribute({
            visible: true
        });
        // Hide text after two seconds
        setTimeout(() => txt.setAttribute({
            visible: false
        }), 2000);
    }
});

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.