Utilize Vue template to retrieve array data using indexes

I'm running into an issue when trying to access data from an array using the index.

This is the code snippet in my template:

<a href="#" class="...">{{ fixture.flatOdds.data[0].market_id }}</a>

However, this results in:

TypeError: fixture.flatOdds.data[0] is undefined

Despite the fact that fixture.flatOdds.data[0] is indeed defined. When I display fixture.flatOdds.data[0] like so:

<a href="#" class="...">{{ fixture.flatOdds.data[0] }}</a>

The object is printed correctly. The JSON response is as follows:

{ "bookmaker_id": 2, "bookmaker_event_id": null, "market_id": 1, "odds": [ { "label": "1", "value": 3, "winning": null, "handicap": null, "total": null, "last_update": { "date": "2018-07-29 08:15:53.000000", "timezone_type": 3, "timezone": "UTC" } }, { "label": "X", "value": 3.2, "winning": null, "handicap": null, "total": null, "last_update": { "date": "2018-07-29 08:15:53.000000", "timezone_type": 3, "timezone": "UTC" } }, { "label": "2", "value": 2.38, "winning": null, "handicap": null, "total": null, "last_update": { "date": "2018-07-29 08:15:53.000000", "timezone_type": 3, "timezone": "UTC" } } ] }

Any idea what could be causing this issue?

Note: I am fetching data from an API using axios.

javascriptvue.jsvuejs2

Answer №1

The issue may be related to the value being undefined at certain points in the component's lifecycle, especially if it is loaded asynchronously. It's important to handle this situation defensively when accessing the property.

One approach is to use a computed property:

const component = {
  computed: {
    marketId () {
      if (this.fixture && this.fixture.flatOdds && this.fixture.flatOdds.data) {
        return fixture.flatOdds.data[0].market_id
      }
      return 'unknown'
    }
  }
}

Alternatively, you could implement a filter:

<template>
  <span>{{fixture | getMarketId}}</span>
</template>

<script>
export default {
  filter: {
    getMarketId (obj) {
      if (obj && obj.flatOdds && obj.flatOdds.data) {
        return obj.flatOdds.data[0].market_id
      }
      return 'unknown'
    }
  }
}
</script>

Another option, as demonstrated by @ittus, is to use a v-if, but make sure to check for potential undefined values in your object.

Answer №2

Is data being loaded asynchronously? fixture.flatOdds.data[0] may not be accessible if the data hasn't loaded yet.

To ensure data availability, you can use v-if to check.

   <a href="#" class="..." 
     v-if="fixture.flatOdds.data[0]">
     {{ fixture.flatOdds.data[0].market_id }}
   </a>

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