I am having trouble getting ngFor to properly render my accessible data. Whenever I attempt to use it, it ends up breaking my code. Can someone please

When using *ngFor to iterate through data, everything appears to be working fine until attempting to access nested data within an object inside another object.

For example:


{
  "tvshow": [
    {
      "id": "value",
      "time": {
        "clock": "value",
        "material": {
          "type": "value"
        }
      }
    }
  ]
}


<div *ngFor="let tvshow of tvshow">
{{tvshow.id}}
{{tvshow.time.clock}} - Works
{{tvshow.time.material}} - prints out [object Object] as it should
{{tvshow.time.material.type}} - Does not work. And breaks the whole page. Makes no sense.
</div>

Has anyone else encountered this issue before? It's quite confusing to me.

Answer №1

Chances are, one of the items in your array is missing some values, leading to a null reference error and disrupting the rendering process.

To avoid rendering errors with null values, utilize the safe navigation operator:

{{movie?.duration?.genre?.category}}

Answer №2

Shoutout to @DeWetvanAs for providing the solution in the comments!

It seems that one of the items in your array is missing some values, leading to a null reference error and breaking the rendering process.

– De Wet van As

That was the exact problem, but using the safe navigation operator (?) resolved it. {{tvshow?.time?.material?.type}}

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