Retrieving a boolean value from a function that includes an asynchronous AJAX request

In my calendar application, I am working with an array of dates:

<div v-for="date in dates">{{ date }}</div>

I want to apply a conditional class based on the outcome of an isWeekend() method that involves making an API call:

<div v-for="date in dates" :class="[(isWeekend) ? 'weekend' : '']>{{ date }}</div>

The isWeekend() method performs an AJAX request and should return true or false. However, due to the asynchronous nature of the call, the method always returns false:

methods: {
  isWeekend(date) {
     let thisIsAWeekend = false
     axios.get('http://myapi/' + date).then(response => { 
       if (...) thisIsAWeekend = true
     })
     return thisIsAWeekend // <-- always returns false
  }
}

I have attempted using setTimeout around the return statement to allow time for the API call to complete, but the method still returns false.

How can I successfully implement a conditional class that relies on an API call?

Note: While there are other methods available such as using JavaScript's getDay() function to determine weekends, this example has been simplified to focus on the technical challenge at hand.

Answer №1

Avoid using the keywords return and async together as they are not meant to be used in conjunction. Since async functions operate asynchronously, they should not be relied upon to return a value directly. It is recommended to retrieve the result from the async call once it has finished executing. Utilizing promises, you can implement a then callback function which will be triggered upon completion of the request. To update a boolean variable effectively, consider changing its value within a higher scope or emitting an event to notify all relevant listeners of the change.

Answer №2

When dealing with async calls, it's important to remember that they don't immediately return a result. Instead, they return a promise that needs to be handled appropriately. Unfortunately, promises cannot be directly used in templates; you'll need an actual value instead.

A simple solution is to create a component that accepts a prop called date, and then set up a watch on this prop. This watch can trigger an axios call to determine if the date falls on a weekend, populating an isWeekend data item within the component.

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