Creating and Updating Graph in HTML and Javascript -


i have website calls function randomly picks number 2 decimal places e.g.

(5.53)

here code:

randomnum = math.floor(math.random() * (1000 - 100) + 100) / 100;

(this gives me value between 1 , 10 2 decimal places)

the website counts number in increments of 0.01 , when reaches value stops , loops creating random number , starts counting again.

if (randomnum < c) {     c = 0;     stopcount() }

(c counter value increments 0.01 every 20ms)

i'm trying create line graph shows increments , updates, image visual aid only, not have working version. this basic version cannot update

this code below i'm using general shape, did not create code. here link source im using. http://www.chartjs.org/docs/latest/charts/line.html

function renderchart() { var ctx = document.getelementbyid("bettingarea").getcontext('2d'); var mylinechart = new chart(ctx, { type: 'line', data: {     labels: [ "1", "2", "3", "4",],     datasets: [{         label: 'crash graph',         data: [5.44, 5.67, 5.94, 6.12,],         backgroundcolor: [             'rgba(255, 99, 132, 0.2)',             'rgba(54, 162, 235, 0.2)',             'rgba(255, 206, 86, 0.2)',             'rgba(75, 192, 192, 0.2)',             'rgba(153, 102, 255, 0.2)',             'rgba(255, 159, 64, 0.2)'         ],         bordercolor: [             'rgba(255,99,132,1)',             'rgba(54, 162, 235, 1)',             'rgba(255, 206, 86, 1)',             'rgba(75, 192, 192, 1)',             'rgba(153, 102, 255, 1)',             'rgba(255, 159, 64, 1)'         ],         borderwidth: 1     }] }, options: {     scales: {         yaxes: [{             ticks: {                 beginatzero:false             }         }]     } } }); }

the same website has http://www.chartjs.org/docs/latest/developers/updates.html

which cannot seam working no matter :(

i suppose i'm asking if there easier way of doing this, , if not please can updatedata set function working

thank provided :)

update: custom pseudocode (i imagine working so)

generate random = randomnum start timer update canvasgraph x.seconds , y.timer timer = timer + 0.01  if timer > randomnum stop.timer end loop else  continue timer start loop again

this basic form of code, , acts visual aid people trying visualize code, know i'm not using correct pseudocode terminology

if understand correctly, after :

var mylinechart, c = 0, label = 0, randomnum, interval;    function renderchart() {     var ctx = document.getelementbyid("bettingarea").getcontext('2d');     mylinechart = new chart(ctx, {        type: 'line',        data: {           labels: ["1", "2", "3", "4"],           datasets: [{              label: 'crash graph',              data: [5.44, 5.67, 5.94, 6.12],              backgroundcolor: [                 'rgba(255, 99, 132, 0.2)',                 'rgba(54, 162, 235, 0.2)',                 'rgba(255, 206, 86, 0.2)',                 'rgba(75, 192, 192, 0.2)',                 'rgba(153, 102, 255, 0.2)',                 'rgba(255, 159, 64, 0.2)'              ],              bordercolor: [                 'rgba(255,99,132,1)',                 'rgba(54, 162, 235, 1)',                 'rgba(255, 206, 86, 1)',                 'rgba(75, 192, 192, 1)',                 'rgba(153, 102, 255, 1)',                 'rgba(255, 159, 64, 1)'              ],              borderwidth: 1           }]        },        options: {           scales: {              yaxes: [{                 ticks: {                    beginatzero: false                 }              }]           }        }     });  }    function updatechart(chart) {     randomnum = math.floor(math.random() * (1000 - 100) + 100) / 100;     chart.data.labels = [];     chart.data.datasets[0].data = [];     interval = setinterval(function() {        if (c < randomnum) {           c += 0.01;           label++;           //update chart           chart.data.labels.push(label.tostring());           chart.data.datasets[0].data.push(+c.tofixed(2));           chart.update();        } else {           clearinterval(interval);           c = 0;           label = 0;           //updatechart(mylinechart) /* maybe call function again */        }     }, 20);  }    window.onload = renderchart;
<script src="https://cdnjs.cloudflare.com/ajax/libs/chart.js/2.6.0/chart.min.js"></script>  <canvas id="bettingarea"></canvas><br>  <button onclick="updatechart(mylinechart)">update chart</button>

correct me if wrong :)


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