Step-by-step guide on integrating async and await functionality into Vuetify rules using an ajax call

Question

Step-by-step guide on integrating async and await functionality into Vuetify rules using an ajax call

I'm currently using Vuetify form validation to validate an input field, and I'm exploring the possibility of making an ajax get call await so that I can utilize the result in a rule. However, my attempts at this approach have not been successful!

export default {
  data() {
    return {
      rules: {
        isLocationNew: value => {

          if (value == '' || value == null || value.length <= 1) {
            this.validLocation = false;
            return 'Invalid length.';
          }

          this.validLocation = true;

          var hasName = this.checkDuplicateLocation(value);
          if (hasName) {
            return 'Location name already exists.';
          } else {
            return true;
          }
        }
      },


      // Defined method below
      methods: {
        async checkDuplicateLocation(text) {
          if (text == '' || text == null || text.length <= 1) {
            return false;
          }

          let response = await axios.get('/api/Locations/HasLocationName', {
            params: {
              text: text,
              jobsiteId: this.jobsiteId
            }
          });
          
          return response.data;
        }
      }

javascript ajax vue.js axios vuetify.js

Answer 1

Answer №1

I stumbled upon a more effective solution when faced with the task of verifying an email address in the database. Instead, I utilized 'error-messages'

in a manner similar to this

@input="newLocationNameSearch($event)" :error-messages="newLocationErrorMessages"

This approach involves validating each character entered through 'newLocationNameSearch()' and managing 'newLocationErrorMessages' to provide feedback to the user!

Answer 2

I stumbled upon a more effective solution when faced with the task of verifying an email address in the database. Instead, I utilized 'error-messages'

in a manner similar to this

@input="newLocationNameSearch($event)" :error-messages="newLocationErrorMessages"

This approach involves validating each character entered through 'newLocationNameSearch()' and managing 'newLocationErrorMessages' to provide feedback to the user!

Answer 3

Answer №2

checkLocationName is a function that returns a promise as it is an async function. So, when you use the function like this:

var hasName = this.checkLocationName(value);

hasName will store a promise object, which always evaluates to truthy in JavaScript.

To handle the promise correctly, the function should look something like this:

    isNewLocationValid: async value => {

      if (value == '' || value == null || value.length <= 1) {
        this.validLocation = false;
        return 'Invalid length.';
      }

      this.validLocation = true;

      var hasName = await this.checkLocationName(value);
      if (hasName) {
        return 'Location name already exists.';
      } else {
        return true;
      }
    }

Don't forget that you need to await the call to isNewLocationValid wherever it is being used.

Additionally, the checkLocationName method does not return any value when awaited as shown below:

      await axios.get('/api/Locations/HasLocationName', {
        params: {
          text: text,
          jobsiteId: this.jobsiteId
        }
      }).then(response => {
        return response.data;
      }).catch(function(error) {
        console.log(error)
      })

The problem here is with the return statement inside the .then() callback. As a result, checkLocationName returns undefined, which is falsy.

Fortunately, using async/await eliminates the need for .then callbacks. You can rewrite the code like this:

try {
     var response = await axios.get('/api/Locations/HasLocationName', {
        params: {
          text: text,
          jobsiteId: this.jobsiteId
        }
      });

      return response.data;

} catch (error) {
    console.log(error)
}

Answer 4

checkLocationName is a function that returns a promise as it is an async function. So, when you use the function like this:

var hasName = this.checkLocationName(value);

hasName will store a promise object, which always evaluates to truthy in JavaScript.

To handle the promise correctly, the function should look something like this:

    isNewLocationValid: async value => {

      if (value == '' || value == null || value.length <= 1) {
        this.validLocation = false;
        return 'Invalid length.';
      }

      this.validLocation = true;

      var hasName = await this.checkLocationName(value);
      if (hasName) {
        return 'Location name already exists.';
      } else {
        return true;
      }
    }

Don't forget that you need to await the call to isNewLocationValid wherever it is being used.

Additionally, the checkLocationName method does not return any value when awaited as shown below:

      await axios.get('/api/Locations/HasLocationName', {
        params: {
          text: text,
          jobsiteId: this.jobsiteId
        }
      }).then(response => {
        return response.data;
      }).catch(function(error) {
        console.log(error)
      })

The problem here is with the return statement inside the .then() callback. As a result, checkLocationName returns undefined, which is falsy.

Fortunately, using async/await eliminates the need for .then callbacks. You can rewrite the code like this:

try {
     var response = await axios.get('/api/Locations/HasLocationName', {
        params: {
          text: text,
          jobsiteId: this.jobsiteId
        }
      });

      return response.data;

} catch (error) {
    console.log(error)
}

Answer 5

Answer №3

functions: {
  getUserData: async function() {
      const feedback = await fetch(
            "https://jsonplaceholder.typicode.com/users"
      );
      this.userList = await feedback.json();
}

This is an illustration of how to utilize it.

Answer 6

functions: {
  getUserData: async function() {
      const feedback = await fetch(
            "https://jsonplaceholder.typicode.com/users"
      );
      this.userList = await feedback.json();
}

This is an illustration of how to utilize it.

Step-by-step guide on integrating async and await functionality into Vuetify rules using an ajax call

Answer №1

Answer №2

Answer №3

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