How can I pass an array of string inputs into Vue 3?

Question

How can I pass an array of string inputs into Vue 3?

Working with Vue 3, I'm setting up a form that will display text input fields corresponding to a fixed-length array of strings. Each field's v-model should connect to the respective string in the array. Here is my current code snippet for the view:

<template
    v-for="(myValue, index) in myValues"
    :key="myValue"
>
    <input
        type="text"
        class="form-control form-control-solid mb-3"
        :placeholder="'Choice #' + (index + 1)"
        v-model="myValues[index]"
    />
</template>

The property myValues is defined as a ref<string[]> in the setup method of my component. The form renders correctly, but I am encountering an issue where I can only enter one character at a time into each input field before losing focus. To continue typing, I have to click back into the field. If I remove the v-model, I can freely input text without interruption.

I suspect this behavior is related to updating values in an array, but I'm unsure how to address it. Is there a way to allow multiple characters to be entered at once while still using v-model?

typescript vue.js vuejs3 vue-component

Answer 1

Answer №1

It's generally advised not to use myValue as a :key in a loop. While there are exceptions (such as with hardcoded arrays), it's important to follow this rule for best practices.

For more information, refer to the official documentation.

Providing a key attribute with v-for is recommended whenever possible, unless the content is simple or performance gains are intentional by relying on default behavior.

Check out this informative article on why using an index as a :key is typically not a good idea.

An official example demonstrates using the element of an array itself as a :key during iteration. A similar approach utilizing nanoid was used previously to generate UUIDs.

In Vue3, the impact of not providing a :key has been reduced thanks to optimizations from the Core team. However, it's still best practice to use something unique as your :key.

Something like this should work effectively:

<input
  v-for="(myValue, index) in myValues"
  :key="myValue.id"
  type="text"
  class="mb-3"
  :placeholder="'Choice #' + (index + 1)"
  v-model="myValues[index]"
/>

Alternatively, consider using v-model.lazy, but avoid passing an index as the :key, as it's not recommended.

Credit goes to this helpful answer.

Answer 2

It's generally advised not to use myValue as a :key in a loop. While there are exceptions (such as with hardcoded arrays), it's important to follow this rule for best practices.

For more information, refer to the official documentation.

Providing a key attribute with v-for is recommended whenever possible, unless the content is simple or performance gains are intentional by relying on default behavior.

Check out this informative article on why using an index as a :key is typically not a good idea.

An official example demonstrates using the element of an array itself as a :key during iteration. A similar approach utilizing nanoid was used previously to generate UUIDs.

In Vue3, the impact of not providing a :key has been reduced thanks to optimizations from the Core team. However, it's still best practice to use something unique as your :key.

Something like this should work effectively:

<input
  v-for="(myValue, index) in myValues"
  :key="myValue.id"
  type="text"
  class="mb-3"
  :placeholder="'Choice #' + (index + 1)"
  v-model="myValues[index]"
/>

Alternatively, consider using v-model.lazy, but avoid passing an index as the :key, as it's not recommended.

Credit goes to this helpful answer.

Answer 3

Answer №2

It is recommended to utilize the index attribute for specifying the unique key in a list of components, as it helps ensure that the inputs do not get re-rendered unnecessarily each time a value changes (causing loss of focus). In this scenario, the values are directly linked to the indices within the array, making it appropriate to use the index as a key.

Answer 4

It is recommended to utilize the index attribute for specifying the unique key in a list of components, as it helps ensure that the inputs do not get re-rendered unnecessarily each time a value changes (causing loss of focus). In this scenario, the values are directly linked to the indices within the array, making it appropriate to use the index as a key.

How can I pass an array of string inputs into Vue 3?

Answer №1

Answer №2

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