What is the process of setting up a subelement in a Vue array?

I am currently working on incorporating an array read feature using Vue.js:

{{ this.locations[this.record.carton.LocationID - 1].Location }}

Although the code functions properly during runtime, it throws an error upon initial loading:

app.js:55125 [Vue warn]: Error in render: "TypeError: Cannot read properties of undefined (reading 'Location')"

app.js:56401 TypeError: Cannot read properties of undefined (reading 'Location')
    at Proxy.render (app.js:49569:28)
    at VueComponent.Vue._render (app.js:58068:22)
    at VueComponent.updateComponent (app.js:58580:21)
    at Watcher.get (app.js:58994:25)
    at new Watcher (app.js:58983:12)
    at mountComponent (app.js:58587:3)
    at VueComponent.Vue.$mount (app.js:63593:10)
    at VueComponent.Vue.$mount (app.js:66507:16)
    at init (app.js:57639:13)
    at merged (app.js:57824:5)

I have attempted to initialize the Location value as shown below, but it does not seem to resolve the issue:

return {
     data() {
        return {
            locations: {
                Location: ''
            },
        }
     }
 }

Answer №1

To tackle this issue in a more versatile way, one can establish defaults and safeguards.

Defaults - similar to your attempt, but utilizing an array instead and ensuring the index expression corresponds to the defaulted index...

return {
   data() {
      return {
        locations: [{ Location: '' }],
        record: { carton: { LocationID: 1 } }
      }
   }
 }

However, this approach may seem forced and fragile. Another option is to safeguard the markup using v-if...

<div v-if="record && record.carton && locations && record.carton.LocationID - 1 < locations.length">
  {{ locations[record.carton.LocationID - 1].Location }}
</div>

Since this expression is intricate, it may be advisable to encapsulate it within a method.

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