javascript - How to visualize data with chart.js properly? -

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i making program, data array , make array. array needs visualize via chart.js in line chart, goes wrong there... code: 

<html>  <head>     <title>visualize data beautifully using js charts</title>     <link href="css/style.css" media="screen" rel="stylesheet">     <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/chart.js/1.0.2/chart.min.js"></script>     <script type="text/javascript" src="http://code.jquery.com/jquery-2.1.4.min.js"></script> </head>  <body>     <center>         <form>             <p>first value:</p>             <input type="text" name="firstname" id="first">             <br/>last value:             <br/>             <input type="text" name="secondname" id="second">             <br/>             <input type="submit" id="btnsubmit" value="submit" />         </form>     </center>      <script>         $(document).ready(function() {             $('#btnsubmit').on("click", function() {                 var array = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100];                 var newarray = [];                 var firstval = $('#first').val();                 var lastval = $('#second').val();                  (var = 0; < array.length; i++) {                     if (array[i] >= firstval && array[i] <= lastval) {                         newarray.push(array[i]);                     }                 }                 var ctx = $("#mychart").get(0).getcontext("2d");                  (var = 0; < newarray.length; i++) {                     var data = {                          labels: [1, 5, 8, 4, 5, 6, 7, 8, 9, 10],                          datasets: [                              {                                 fillcolor: "rgba(151,187,205,0.5)",                                 strokecolor: "rgba(151,187,205,1)",                                 pointcolor: "rgba(151,187,205,1)",                                 pointstrokecolor: "#fff",                                 data: newarray[i]                             }                         ]                     }                 }                 var mynewchart = new chart(ctx).line(data);             });         })     </script>     <div>         <section>             <article>                 <canvas id="mychart" width="400" height="400">                 </canvas>             </article>         </section>     </div> </body>  </html>

can please me that, because have no idea might mistake in code, new jquery , chart.js.

your button has type="submit". submits form when click refreshing it. change type="button"

<input type="button" id="btnsubmit" value="submit" />

the data property dataset should array. can take out outer loop , directly plug in newarray

var ctx = $("#mychart").get(0).getcontext("2d"); var data = {     labels: [1, 5, 8, 4, 5, 6, 7, 8, 9, 10],     datasets: [         {             fillcolor: "rgba(151,187,205,0.5)",             strokecolor: "rgba(151,187,205,1)",             pointcolor: "rgba(151,187,205,1)",             pointstrokecolor: "#fff",             data: newarray         }     ] }

with these 2 changes, putting in first , last value (say 20 , 60) plot chart.

however, if want data align original indices (and not pushed left), should inserting null values in first loop

if (array[i] >= firstval && array[i] <= lastval) {     newarray.push(array[i]); // add new array } else {     newarray.push(null); }

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