What is the method for invoking an imported function in a template?

Question

What is the method for invoking an imported function in a template?

Let's analyze the code snippet below, which utilizes a method and an imported function:

<template>
  <div>
    {{sayHello()}}
    {{sayDate()}}
    {{DateTime.now()}}
  <div>
</template>

<script>
import {DateTime} from "luxon"

export default {
  methods: {
   sayHello() {
    return "hello"
   },
   sayDate() {
    return DateTime.now()
  }
 }
}
</script>

sayHello() is functioning correctly as it is defined within methods.
sayDate() is working fine too.

However, using DateTime.now() in the <template> section results in a failure message:

[Vue warn]: Property or method "DateTime" is not defined on the instance but referenced during render.

How can we properly reference DateTime within the <template> for correct functionality?

javascript vue.js

Answer 1

Answer №1

While I concur with Boussadjra's suggestions, for those adamant about using DateTime.now() in your template, one option is to import DateTime as data. Below is an example demonstrating a similar approach that I personally crafted.

File: ImportObjectToData.vue

<template>
  <div class="import-object-to-data">
    <div class="row">
      <div class="col-md-6">
        <span>{{ DataObject.getMessage() }}</span>
      </div>
    </div>
  </div>
</template>

<script>
  import DataObject from './data-object.js'

  export default {
    data() {
      return {
        DataObject
      }
    }
  }
</script>

File: data-object.js

const DataObject = {
  message: 'Greetings from DataObject',
  getMessage() {
    return this.message;
  }
}

export default DataObject;

Answer 2

While I concur with Boussadjra's suggestions, for those adamant about using DateTime.now() in your template, one option is to import DateTime as data. Below is an example demonstrating a similar approach that I personally crafted.

File: ImportObjectToData.vue

<template>
  <div class="import-object-to-data">
    <div class="row">
      <div class="col-md-6">
        <span>{{ DataObject.getMessage() }}</span>
      </div>
    </div>
  </div>
</template>

<script>
  import DataObject from './data-object.js'

  export default {
    data() {
      return {
        DataObject
      }
    }
  }
</script>

File: data-object.js

const DataObject = {
  message: 'Greetings from DataObject',
  getMessage() {
    return this.message;
  }
}

export default DataObject;

Answer 3

Answer №2

Avoid using methods for rendering and opt for computed properties instead. For instance, in your scenario, you could implement it like this:

<template>
  <div>
    {{greetUser}}
    {{currentDateTime}}
  </div>
</template>

<script>
import {DateTime} from "luxon";

export default {
  computed:{
    greetUser() {
       return "Hello"
    },
   currentDateTime(){
      return DateTime.now()
    }
  }
}
</script>

Remember to not use parenthesis when calling computed properties.

Answer 4

Avoid using methods for rendering and opt for computed properties instead. For instance, in your scenario, you could implement it like this:

<template>
  <div>
    {{greetUser}}
    {{currentDateTime}}
  </div>
</template>

<script>
import {DateTime} from "luxon";

export default {
  computed:{
    greetUser() {
       return "Hello"
    },
   currentDateTime(){
      return DateTime.now()
    }
  }
}
</script>

Remember to not use parenthesis when calling computed properties.

What is the method for invoking an imported function in a template?

Answer №1

Answer №2

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