Removing NaN from date time returned in javascript

问题

I am working on yii2. In my javascript, I have a formula through which I am getting some data. The data is then passed to chart and chart renders it.

var arry_kwh = [];
arry_kwh = <?php echo json_encode($dataPointskWh, JSON_NUMERIC_CHECK); ?>;
var arry_kwh_diff = [];
var i = 0;
for (; i < arry_kwh.length - 1; i++) {
    arry_kwh_diff[i] = {
        label: arry_kwh[i].label + ((arry_kwh[i + 1].label - arry_kwh[i].label) / 2),
        y: (arry_kwh[i + 1].y - arry_kwh[i].y)
    };
}
console.log(JSON.stringify(arry_kwh_diff, null, 2));

The returned log is

[
{
  "label": "2020-04-01 11:44:13NaN",
   "y": 50
},
{
  "label": "2020-04-01 11:45:49NaN",
  "y": 25
},
{
  "label": "2020-04-01 13:11:24NaN",
   "y": 25
},
{
  "label": "2020-04-02 10:19:08NaN",
   "y": 50
},
{
  "label": "2020-04-02 11:24:38NaN",
  "y": 50
},
{
  "label": "2020-04-04 12:24:38NaN",
  "y": 100
},
{
  "label": "2020-04-05 13:49:38NaN",
  "y": 50
},
{
  "label": "2020-04-05 14:36:38NaN",
  "y": 100
},
{
  "label": "2020-04-05 14:24:38NaN",
  "y": 50
},
{
  "label": "2020-04-08 09:20:41NaN",
  "y": 35
},
{
  "label": "2020-04-08 10:09:38NaN",
  "y": 55
},
{
  "label": "2020-04-08 11:35:33NaN",
  "y": 35
},
{
  "label": "2020-04-08 13:24:38NaN",
  "y": 50
}
 ]

The $dataPointskWh have

Array ( [0] => Array ( [label] => 2020-04-01 11:44:13 [y] => 100 ) [1] => Array ( [label] => 2020-04-01 11:45:49 [y] => 150 ) [2] => Array ( [label] => 2020-04-01 13:11:24 [y] => 175 ) [3] => Array ( [label] => 2020-04-02 10:19:08 [y] => 200 ) [4] => Array ( [label] => 2020-04-02 11:24:38 [y] => 250 ) [5] => Array ( [label] => 2020-04-04 12:24:38 [y] => 300 ) [6] => Array ( [label] => 2020-04-05 13:49:38 [y] => 400 ) [7] => Array ( [label] => 2020-04-05 14:36:38 [y] => 450 ) [8] => Array ( [label] => 2020-04-05 14:24:38 [y] => 550 ) [9] => Array ( [label] => 2020-04-08 09:20:41 [y] => 600 ) [10] => Array ( [label] => 2020-04-08 10:09:38 [y] => 635 ) [11] => Array ( [label] => 2020-04-08 11:35:33 [y] => 690 ) [12] => Array ( [label] => 2020-04-08 13:24:38 [y] => 725 ) [13] => Array ( [label] => 2020-04-08 17:12:35 [y] => 775 ) )

How can I remove NaN from date-time? I have looked into this issue but couldn't find any solution.

Any help would be highly appreciated.

回答1:

You can easily do it by mapping the label attribute and remove the last 3 characters

like this

data = data.map(el => el.label.substr(0, el.label.length - 3))

Notice: it is recommended the first answer in case of that all objects have NaN at the end of line otherwise use the second solution

or by another way, you can replace NaN with "" like this one

data = data.map(el => el.label.replace('NaN', ''))

来源：https://stackoverflow.com/questions/61401860/removing-nan-from-date-time-returned-in-javascript

标签

javascript

php

nan

yii2-advanced-app

canvasjs