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Self-contained function plotting
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<iframe 
    src="http://jsxgraph.uni-bayreuth.de/share/iframe/self-contained-function-plotting" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Self-contained function plotting" 
    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, keepaspectratio: true
    });
    
    var input = board.create('input', [-4.5, 4, 'x^2', 'f: '], {
        cssStyle: 'width: 8em'
    });
    var plots = [];
    
    var plot = function() {
        var f = board.jc.snippet(input.Value(), true, 'x', false);
        plots.push(board.create('functiongraph', [f]));
    };
    var clear = function() {
        for (f of plots) {
            board.removeObject(f);
        }
    };
    
    var btn_start = board.create('button', [-4.5, 3.2, 'plot', plot]);
    var btn_clear = board.create('button', [-3.0, 3.2, 'clear all', clear]);
 </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, keepaspectratio: true
});

var input = board.create('input', [-4.5, 4, 'x^2', 'f: '], {
    cssStyle: 'width: 8em'
});
var plots = [];

var plot = function() {
    var f = board.jc.snippet(input.Value(), true, 'x', false);
    plots.push(board.create('functiongraph', [f]));
};
var clear = function() {
    for (f of plots) {
        board.removeObject(f);
    }
};

var btn_start = board.create('button', [-4.5, 3.2, 'plot', plot]);
var btn_clear = board.create('button', [-3.0, 3.2, 'clear all', clear]);
<jsxgraph width="100%" aspect-ratio="1 / 1" title="Self-contained function plotting" 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, keepaspectratio: true
   });
   
   var input = board.create('input', [-4.5, 4, 'x^2', 'f: '], {
       cssStyle: 'width: 8em'
   });
   var plots = [];
   
   var plot = function() {
       var f = board.jc.snippet(input.Value(), true, 'x', false);
       plots.push(board.create('functiongraph', [f]));
   };
   var clear = function() {
       for (f of plots) {
           board.removeObject(f);
       }
   };
   
   var btn_start = board.create('button', [-4.5, 3.2, 'plot', plot]);
   var btn_clear = board.create('button', [-3.0, 3.2, 'clear all', clear]);
</jsxgraph>
In this example, input field and buttons are part of the JSXGraph construction.
// Define the id of your board in BOARDID

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

var input = board.create('input', [-4.5, 4, 'x^2', 'f: '], {
    cssStyle: 'width: 8em'
});
var plots = [];

var plot = function() {
    var f = board.jc.snippet(input.Value(), true, 'x', false);
    plots.push(board.create('functiongraph', [f]));
};
var clear = function() {
    for (f of plots) {
        board.removeObject(f);
    }
};

var btn_start = board.create('button', [-4.5, 3.2, 'plot', plot]);
var btn_clear = board.create('button', [-3.0, 3.2, 'clear all', clear]);

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.