Utilizing retrieved data from API calls in subsequent Vue 3 methods

Question

Utilizing retrieved data from API calls in subsequent Vue 3 methods

Hello, I'm having an issue with using fetched data in a different method within VUE 3. My goal is to load all the data when the app starts and then be able to use it multiple times throughout the code. Here is my current code snippet:

const app = Vue.createApp({
 data() {
  return {
   dataAll : [],
  };
 },

 mounted() {
  this.getData();
  this.otherFunction();
 },

 methods: {
  getData() {
   fetch('app/api.php')
   .then((response) => response.json())
    .then((data) => {
      this.dataAll = data;
      //this.dataAll = JSON.parse(JSON.stringify(data));
    });
  },
  otherFunction() {
   console.log(this.dataAll);
  }
});

However, the console is showing Proxy {} - Array(0). Can anyone point out where I might have made a mistake? Thanks.

javascript vue.js fetch vuejs3

Answer 1

Answer №1

The asynchronous nature of the fetch function means that you must ensure the getData function resolves before executing otherFunction.

Make sure to wait for the promise to resolve before calling any other functions that rely on the fetched data:

const app = Vue.createApp({
  data() {
    return {
      allData: [],
    };
  },
  mounted() {
    this.getData().then(() => {
      this.otherFunction();
    })
  },
  methods: {
    getData() {
      return fetch('app/api.php')
        .then((response) => response.json())
        .then((data) => {
          this.allData = data;
        });
    },
    otherFunction() {
      console.log(this.allData);
    }
  }
});

You can also utilize async await for a cleaner approach:

const app = Vue.createApp({
  data() {
    return {
      allData: [],
    };
  },
  async mounted() {
    await this.getData();
    this.otherFunction();
  },
  methods: {
    async getData() {
      const data = await fetch(
        "app/api.php"
      ).then((response) => response.json());
      this.allData = data;
    },
    otherFunction() {
      console.log(this.allData);
    }
  }
});

Learn more about using the fetch API here

Discover how async and await can simplify your code

Answer 2

The asynchronous nature of the fetch function means that you must ensure the getData function resolves before executing otherFunction.

Make sure to wait for the promise to resolve before calling any other functions that rely on the fetched data:

const app = Vue.createApp({
  data() {
    return {
      allData: [],
    };
  },
  mounted() {
    this.getData().then(() => {
      this.otherFunction();
    })
  },
  methods: {
    getData() {
      return fetch('app/api.php')
        .then((response) => response.json())
        .then((data) => {
          this.allData = data;
        });
    },
    otherFunction() {
      console.log(this.allData);
    }
  }
});

You can also utilize async await for a cleaner approach:

const app = Vue.createApp({
  data() {
    return {
      allData: [],
    };
  },
  async mounted() {
    await this.getData();
    this.otherFunction();
  },
  methods: {
    async getData() {
      const data = await fetch(
        "app/api.php"
      ).then((response) => response.json());
      this.allData = data;
    },
    otherFunction() {
      console.log(this.allData);
    }
  }
});

Learn more about using the fetch API here

Discover how async and await can simplify your code

Utilizing retrieved data from API calls in subsequent Vue 3 methods

Answer №1

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