Is it possible to directly utilize functions from an imported JavaScript library, such as Change Case, within the template of a Vue component?

After successfully importing and using the Change Case library within the <script></script> element of a Vue component, I now seek to directly utilize the Change Case functions in the template itself.

As of now, my understanding is that when dealing with dynamic content in the template generated by v-for looping through an array, I must render the output of an intermediary method defined in the component's methods section which applies the Change Case function. Each case type (e.g. camelCase, snakeCase, etc.) requires a separate method to be created in order to be rendered, for example, one for capitalCase:

      // ...

      <div
        v-for="location in locations"
        :key="location.name"
      >
        <input
          type="checkbox"
          :id="`select-${location.name}`"
          :value="capitalCaseLocationName(location.name)"
          v-model="locationsInput"
        />
        <label :for="`select-${location.name}`">
          {{ capitalCaseLocationName(location.name) }} 
        </label>
      </div>
      
      // ...

      methods: {
        capitalCaseLocationName(name) {
          return capitalCase(name)
        }
      },
      
      // ...

I am interested in finding a way to import Change Case into the template logic so that I can use it without requiring intermediary methods like this:

      // ...

      <div
        v-for="location in locations"
        :key="location.name"
      >
        <input
          type="checkbox"
          :id="`select-${location.name}`"
          :value="capitalCase(location.name)"
          v-model="locationsInput"
        />
        <label :for="`select-${location.name}`">
          {{ capitalCase(location.name) }} 
        </label>
      </div>
      
      // ...

Is there any possibility of achieving this?

Answer №1

To utilize the imported function directly in the template, ensure that you register it as a method first. Based on the code snippet provided, since you are utilizing the Options API, you can achieve this by following the example below:

import {capitalCase} from "change-case";
...
methods: {
    capitalCase,
    myOtherMethod () => {...}
}
...

In your <template>:

<input
    type="checkbox"
    :id="`select-${location.name}`"
    :value="capitalCase(location.name)"
    v-model="locationsInput"
/>

Answer №2

To make functions work in templates, they need to be defined and passed through the template. That's why even using console.log won't function from within a template.

You may have already seen an example answer, but here's another suggestion that could simplify things.

You can create a helper like this:

template-helpers.js

export function capitalizeFirstLetter(str) {
  return str.split(" ").map(word => word[0].toUpperCase() + word.slice(1)).join(" ")
}

export default {
  capitalizeFirstLetter
}

This way, you can use it in a composition/setup like this:

import templateHelpers from "../utils/template-helpers.js";
setup(){
  return{
    ...templateHelpers
  }
}

In an options API component, you can include it simply by:

import templateHelpers from "../utils/template-helpers.js";
// ...
  methods: {
    ...templateHelpers,
    // other methods
  }
// ...

Example

By exporting functions in export default, you can destructure them using methods: { ...templateHelpers

The drawback is that all methods are included every time, but it offers a more convenient solution. Alternatively, you can selectively choose which functions to include since they are individually exported as well.

import {capitalizeFirstLetter} from "../utils/template-helpers.js";
// ...
  methods: {
    capitalizeFirstLetter,
    // other methods
  }
// ...

While Vue does have a method for adding global definitions, it is discouraged. This can be done by assigning it to config.globalProperties https://vuejs.org/api/application.html#app-config-globalproperties

app.config.globalProperties.capitalizeFirstLetter = (str) => {
  return str.split(" ").map(word => word[0].toUpperCase() + word.slice(1)).join(" ")

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