What is the best way to concentrate on a changing input in Vue 3?

Currently, I am developing an application in Vue 3 using Script Setup and Quasar. In this app, users can add new input boxes by simply clicking the "New Space +" button. However, it has become quite tedious to click the button repeatedly, so I am looking to implement a feature where pressing 'enter' will not only add a new space but also focus on that newly added space. Although the functionality for adding a new input box is working fine with both the button and the 'Enter' key, I am facing difficulties in targeting the newly added input element. The inputs function by adding an empty element to an array, making it challenging for me to focus on this specific new element.

https://i.sstatic.net/KIlLI.png

I have come across various solutions involving "this.$refs.input", but they all involve declaring refs (const input = ref(null)), which isn't feasible for me due to the dynamic nature of the input. Moreover, using "this" throws an error.

Although I referred to this source for guidance, it did not provide a solution for my issue.

HTML - Vue using Quasar

<div
    class="col-3 q-pa-md q-gutter-sm"
    v-for="(space, index) in selectedSpaces"
    :key="index"
>
    <div class="row">
        <div class="col-9">
            <q-input
                v-model="selectedSpaces[index]"
                v-on:keyup.enter="AddNewSpace()"
             />
        </div>
        <div class="col-2 q-pt-xs q-pl-sm">
            <q-btn ..../> 
        </div>
    </div>
</div>

//also tried
<q-input
    v-model="selectedSpaces[index]"
    v-on:keyup.enter="AddNewSpace($event)"
/>

Vue 3 using Script Setup

 <script setup lang="ts">
    const selectedSpaces = ref<string[]>([]);

    const AddNewSpace = (): void => {
       selectedSpaces.value.push('');
       const index = selectedSpaces.value.length - 1;

       //Here's where I'm struggling
       selectedSpaces.value[index].focus();
   };

   //also tried
    const AddNewSpace = ($event: any): void => {
       selectedSpaces.value.push('');
       $event.target.parentElement.nextElement.children[1].focus();
       //AND
       $event.target.parentElement.nextElementSibling .children[1].focus();
   };

 </script>

To reiterate, when a new space is added using the AddNewSpace() method, how can I also ensure that the focus is directed to that newly added space?

Answer №1

ref is applicable in this scenario by giving each <q-input> the same ref and specifying that ref as an array. This ref will then store all current and future <q-input> elements. You can find more information about this in the Vue 3 documentation for Composition API (you may need to switch to Composition API syntax on the left side because Options API is loaded by default)

<q-input
  v-model="selectedSpaces[index]"
  ref="spaceRefs"
  @keyup.enter="AddNewSpace()"
/>

When used in conjunction with nextTick, you can focus on the new element using the index value from the ref.

<script setup lang="ts">
import { ref, nextTick } from "vue";

const selectedSpaces = ref<string[]>([]);

const spaceRefs = ref([]);

const AddNewSpace = (): void => {
  selectedSpaces.value.push("");
  const index = selectedSpaces.value.length - 1;
  nextTick().then(() => {
    spaceRefs.value[index].focus();
  });
};
</script>

If you encounter references to this in Vue, it's likely referring to older Vue 2 documentation or Vue 3 with Vue 2's Options API.

Answer №2

It's difficult to determine the exact issue without a reproducible example, but it appears to be a common scenario where nextTick() could come in handy: when you modify data triggering a redraw, and need to access nodes before they are rendered. Utilizing nextTick() allows you to postpone actions until after rendering is complete.

You can test this approach with:

<script setup lang="ts">
    import { nextTick } from 'vue'
    ...
    const AddNewSpace = ($event: any): void => {
       selectedSpaces.value.push('');
       nextTick(() => selectedSpaces.value[index].focus());
   };
 </script>

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