Ngx-charts can't load line chart from feed correctly, works with local file

问题

I am having a char initialised. Works good so configuration is properly set up and dependency installed. I followed example for line-chart and used data provided here: https://swimlane.gitbooks.io/ngx-charts/content/charts/line-chart.html

Works correctly. Problem is when I load a data from API feed, my graph acts strange, tooltip is not disappearing and whatever route i click it loads in same window, aka something is broken:

Now this is the data from feed:

{
    "currentWeight": 80,
    "bodyMassIndex": 0,
    "exercisesProgress": [
        {
            "name": "Bench Press",
            "series": [
                {
                    "name": "10/10/2017",
                    "value": 66
                },
                {
                    "name": "12/10/2017",
                    "value": 78
                },
                {
                    "name": "15/10/2017",
                    "value": 61
                },
                {
                    "name": "18/10/2017",
                    "value": 79
                },
                {
                    "name": "19/10/2017",
                    "value": 74
                },
                {
                    "name": "22/10/2017",
                    "value": 68
                },
                {
                    "name": "23/10/2017",
                    "value": 75
                },
                {
                    "name": "17/11/2017",
                    "value": 76
                },
                {
                    "name": "23/11/2017",
                    "value": 62
                },
                {
                    "name": "23/12/2017",
                    "value": 71
                },
                {
                    "name": "23/01/2018",
                    "value": 68
                },
                {
                    "name": "23/02/2018",
                    "value": 70
                }
            ]
        }
    ]
}

I then initialise data like this in graph:

<ngx-charts-line-chart
      [view]="view"
      [scheme]="colorScheme"
      [results]="dashboardModel.exerciseProgress"
      [gradient]="gradient"
      [xAxis]="showXAxis"
      [yAxis]="showYAxis"
      [legend]="showLegend"
      [showXAxisLabel]="showXAxisLabel"
      [showYAxisLabel]="showYAxisLabel"
      [xAxisLabel]="xAxisLabel"
      [yAxisLabel]="yAxisLabel"
      [autoScale]="autoScale"
      (select)="onSelect($event)">
</ngx-charts-line-chart>

Thing doesn't work. When I put data directly into ts.file:

export var multi = [
  {
      "name": "Bench Press",
      "series": [
          {
              "name": "10/10/2017",
              "value": 66
          },
          {
              "name": "12/10/2017",
              "value": 78
          },
          {
              "name": "15/10/2017",
              "value": 61
          },
          {
              "name": "18/10/2017",
              "value": 79
          },
          {
              "name": "19/10/2017",
              "value": 74
          },
          {
              "name": "22/10/2017",
              "value": 68
          },
          {
              "name": "23/10/2017",
              "value": 75
          },
          {
              "name": "17/11/2017",
              "value": 76
          },
          {
              "name": "23/11/2017",
              "value": 62
          },
          {
              "name": "23/12/2017",
              "value": 71
          },
          {
              "name": "23/01/2018",
              "value": 68
          },
          {
              "name": "23/02/2018",
              "value": 70
          }
      ]
  }
];

and then initialise it like:

<ngx-charts-line-chart
      [view]="view"
      [scheme]="colorScheme"
      [results]="multi"
      [gradient]="gradient"
      [xAxis]="showXAxis"
      [yAxis]="showYAxis"
      [legend]="showLegend"
      [showXAxisLabel]="showXAxisLabel"
      [showYAxisLabel]="showYAxisLabel"
      [xAxisLabel]="xAxisLabel"
      [yAxisLabel]="yAxisLabel"
      [autoScale]="autoScale"
      (select)="onSelect($event)">
</ngx-charts-line-chart>

Then it works. I am not sure what is different:

回答1:

You are loading data from api call which is async is takes some time to return and initilize the the graph and think that what ngx chart dosent like.

So you need to check something like this dashboardModel?.exerciseProgress or even put the whole thing inside a ngIf = "dashboardModel"

来源：https://stackoverflow.com/questions/46629702/ngx-charts-cant-load-line-chart-from-feed-correctly-works-with-local-file