Vue 3 custom checkbox component with v-model and array of items

Question

Desperately in need of your help guys.

So basically I have a custom checkbox component whit a v-model. I use a v-for loop on the component to display checkboxes with the names from the array. In the parent component I have two columns Available and Selected. The idea is that if I check one of the boxes in the Available column it should appear on the Selected column. The problem is that it displays letter by letter and not the full name.

I am able to achieve the desired result without having a checkbox component, but since I will be needing checkboxes a lot throught my project I want to have a component for it.

Please follow the link for the code: CodeSandBox

Dont mind the difference in styling.

The problem:

The desired outcome:

Answer 1

There are two problems. The first problem is, that you have your v-model set to v-model="filter.filterCollection", so a checkbox you select will be stored into the array as a string and if you select another checkbox the string gets overwritten. The second problem is, that you call that stored string as an array. That causes, that your string, which is an array of letters, will be rendered for each letter. So 'Number' is like ["N", "u", "m", "b", "e", "r"].

To solve your problem, you need to store every selection with its own reference in your v-model. To cover your needs of correct listing and correct deleting you need to apply the following changes:

Your checkbox loop

<Checkbox
   v-for="(item, index) in items"
   :key="item.id"
   :label="item.name"
   :id="index"
   :isChecked="isChecked(index)" // this is new
   @remove-selected-filter="removeSelectedFilter" // This is new
   :modelValue="item.name"
   v-model="filter.filterCollection[index]" // Change this
/>

Your v-model

filter: {
        filterCollection: {} // Object instead of array
      }

Methods in FilterPopUp.vue

methods: {
    removeSelectedFilter(index) {
      delete this.filter.filterCollection[index];
    },
    isChecked(index) {
      return !!this.filter.filterCollection[index];
    }
  }

Your Checkbox.vue:

<template>
  <label>
    <p>{{ label }}</p>
    <input
      type="checkbox"
      :id="id"
      :value="modelValue"
      :checked="isChecked"
      @change="emitUncheck($event.target.checked)"
      @input="$emit('update:modelValue', $event.target.value)"
    />
    <span class="checkmark"></span>
  </label>
</template>

<script>
export default {
  name: "Checkbox",
  props: {
    modelValue: { type: String, default: "" },
    isChecked: Boolean,
    label: { type: String },
    value: { type: Array },
    id: { type: Number },
  },
  methods: {
    emitUncheck(event) {
      if(!event){
        this.$emit('remove-selected-filter', this.id);
      }
    }
  }
};
</script>

This should now display your items properly, delete the items properly and unselect the checkboxes after deleting the items.