Show Difference Between First Datapoint and Last Datapoint

• February 15, 2021 at 10:15 am #32779
  
  1CoolDude

  Is there a way to dynamically show the difference between the first datapoint and the last datapoint on a line chart? Thanks.

  February 15, 2021 at 10:49 am #32785
  
  1CoolDude

  For example, if we wanted to show weight loss, and there were three datapoints: 300; 280; and 265. Weight loss would be 20 on the second point and 35 on the third point. Is there a way to show that without hard coding it? Thanks.

  February 15, 2021 at 7:09 pm #32792
  
  Adithya Menon

  @1CoolDude,

  You can achieve your requirements by showing the difference between dataPoints as indexLabel as shown in this JSFiddle.

  

  —
  Adithya A Menon
  Team CanvasJS

  February 15, 2021 at 8:18 pm #32795
  
  1CoolDude

  Works great. Thanks.

  February 16, 2021 at 12:16 am #32796
  
  1CoolDude

  I noticed that this works unless there are decimal places introduced. For example, 299.8 and 291.7. Then it returns 15 decimals places. Is there a way to have it return only on decimal place? Thanks.

  February 16, 2021 at 3:16 pm #32802
  
  Adithya Menon

  @1CoolDude,

  You can format a number to fix decimals using formatNumber method. Please take a look at this JSFiddle for an example.

  —
  Adithya A Menon
  Team CanvasJS

  February 16, 2021 at 7:56 pm #32806
  
  1CoolDude

  Very helpful. Thanks so much.