Errors are being displayed in the console when attempting to use Vuex getters in a component. This is happening because the Vuex state properties are still null at the time the getters

Question

Errors are being displayed in the console when attempting to use Vuex getters in a component. This is happening because the Vuex state properties are still null at the time the getters

When assigning results from GET requests to my Vuex state properties, it's expected that they won't be available instantly. However, I have a getter like the following:

findChampion: (state) => (id) => {
     let championId = id.toString();
     let champion = Object.values(state.champions).find(value => value.key === championId);

     return champion
 }

When this getter is called from a component, it appears that at the initial call, the state.champions property is still null, resulting in numerous errors within the component.

This is how I invoke the getter from my component:

<img :src="'http://ddragon.leagueoflegends.com/cdn/' + $store.getters.version + '/img/champion/' + $store.getters.findChampion(this.match.mainParticipant.championId).image.full" alt="">

Is there a way to ensure that my component waits for the Vuex state to be not null before calling the getter?

The error message currently being displayed is

TypeError: Cannot convert undefined or null to object

javascript vue.js vuex

Answer 1

Answer №1

Here are a couple of solutions you can try.

To resolve the error stating 'TypeError: Cannot convert undefined or null to object,' consider setting the default state value to something other than null. In this case, you can set the default value of that state to an empty object {}.

TypeError: Cannot convert undefined or null to object

Another approach is to add a check in your code to ensure that the state value is as expected before trying to use it.

For instance, within your findChampion function, make sure to check the state value first:

findChampion: (state) => (id) => {
     if (!state.champions) {
         return []; // or handle accordingly 
     }

     let championId = id.toString();
     let champion = Object.values(state.champions).find(value => value.key === championId);

     return champion
 }

Answer 2

Here are a couple of solutions you can try.

To resolve the error stating 'TypeError: Cannot convert undefined or null to object,' consider setting the default state value to something other than null. In this case, you can set the default value of that state to an empty object {}.

TypeError: Cannot convert undefined or null to object

Another approach is to add a check in your code to ensure that the state value is as expected before trying to use it.

For instance, within your findChampion function, make sure to check the state value first:

findChampion: (state) => (id) => {
     if (!state.champions) {
         return []; // or handle accordingly 
     }

     let championId = id.toString();
     let champion = Object.values(state.champions).find(value => value.key === championId);

     return champion
 }

Answer 3

Answer №2

I suggest verifying the existence of state.champions before proceeding. Consider implementing this logic:

findChampion: (state) => (id) => {
  let championId = id.toString()
  let champion = state.champions ? Object.values(state.champions).find(value => value.key === championId) : []
  return champion
}

: [] returns an empty array, but you can opt to return null, false, undefined, or any other desired value.

Please test this solution and provide feedback on its performance.

Answer 4

I suggest verifying the existence of state.champions before proceeding. Consider implementing this logic:

findChampion: (state) => (id) => {
  let championId = id.toString()
  let champion = state.champions ? Object.values(state.champions).find(value => value.key === championId) : []
  return champion
}

: [] returns an empty array, but you can opt to return null, false, undefined, or any other desired value.

Please test this solution and provide feedback on its performance.

Errors are being displayed in the console when attempting to use Vuex getters in a component. This is happening because the Vuex state properties are still null at the time the getters

Answer №1

Answer №2

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