Vue.js 3.x CheckboxForm コンポーネント

• checkbox タグのエラーメッセージ表示付きコンポーネント
• 複数の選択候補から選択する複数チェックボックスとして機能させたい
• 単一フィールドの Boolean 値切り替え用途は SwitchForm を参照

CheckboxForm.js

import { computed } from 'https://cdnjs.cloudflare.com/ajax/libs/vue/3.0.2/vue.esm-browser.js';
import { getWrapClass, generalizeOptions } from 'https://wws.jp/_export/code/vuejs/vue3/form_utils?codeblock=0';
 
const CheckboxForm = {
  template: `
    <div :class="computedControlWrapperClasses" :style="controlWrapperStyles">
      <label v-for="(opt, idx) in computedOptions"
        :class="optionClasses"
        :style="optionStyles"
      >
        <input type="checkbox"
          :class="controlClasses"
          :style="controlStyles"
          :checked="isChecked(opt.value)"
          @change="onChange(opt.value)"
        >
        {{ opt.title }}
      </label>
      <div :class="computedMessageWrapperClasses" :style="messageWrapperStyles">
        <template v-for="msg in errors">
          <span>{{ msg }}</span><br>
        </template>
      </div>
    </div>
  `,
  props: {
    value:                 { type: Array },
    options:               { type: Array,  default: [] },
    errors:                { type: Array,  default: [] },
    controlWrapperClasses: { type: Array,  default: [] },
    controlWrapperStyles:  { type: Object, default: {} },
    controlClasses:        { type: Array,  default: [] },
    controlStyles:         { type: Object, default: {} },
    optionClasses:         { type: Array,  default: ['checkbox-inline'] },
    optionStyles:          { type: Object, default: {} },
    messageWrapperClasses: { type: Array,  default: [] },
    messageWrapperStyles:  { type: Object, default: {} },
    controlErrorClass:     { type: String, default: 'has-error' },
    messageErrorClass:     { type: String, default: 'text-danger' },
  },
 
  setup(props, context) {
    const computedControlWrapperClasses = computed(() => {
      return getWrapClass(
        props.errors,
        props.controlWrapperClasses,
        props.controlErrorClass
      )
    })
 
    const computedMessageWrapperClasses = computed(() => {
      return getWrapClass(
        props.errors,
        props.messageWrapperClasses,
        props.messageErrorClass
      )
    })
 
    const computedOptions = computed(() => {
      return generalizeOptions(props.options)
    })
 
    function onChange(v) {
      const idx = props.value.indexOf(v)
      if (idx >= 0) {
        props.value.splice(idx, 1)
      } else {
        props.value.splice(0, 0, v)
      }
      context.emit('update:value', props.value)
    }
 
    function isChecked(v) {
      return (props.value.indexOf(v) >= 0) ? true : false
    }
 
    return {
      computedControlWrapperClasses,
      computedMessageWrapperClasses,
      computedOptions,
      isChecked,
      onChange
    }
  }
};
export default CheckboxForm;

<html><style>th, td { padding: 12px !important }</style></html>

<html><style>th, td { padding: 12px !important }</style></html>

<html>

<h3>コンポーネント実装</h3>
<checkbox-form
  :options="options"
  :control-wrapper-classes="['checkbox', 'col-sm-12']"
  :errors="errors"
  v-model:value="boundValue"
>
</checkbox-form>
<br>
<h3>データバインディング確認用フォーム</h3>
<checkbox-form
  :options="options"
  :control-wrapper-classes="['checkbox', 'col-sm-12']"
  :errors="errors"
  v-model:value="boundValue"
  :option-classes="['checkbox']"
>
</checkbox-form>
<button @click="clearError">ClearError</button>
<button @click="appendError">AppendError</button>
<button @click="showValue">ShowValue</button>

<script type=“module”>
import { createApp } from 'https://cdnjs.cloudflare.com/ajax/libs/vue/3.0.2/vue.esm-browser.js';
import CheckboxForm from '/_export/code/vuejs/vue3/checkbox_form?codeblock=0';

const App = {

components: {
  checkboxForm: CheckboxForm
},
data() {
  return {
    boundValue: ['AAA'],

// options: ['ABC', 'XYZ', 'AAA'],

    options: [
      {title: 'ABCタイトル', value: 'ABC'},
      {title: 'XYZタイトル', value: 'XYZ'},
      {title: 'AAAタイトル', value: 'AAA'}
    ],
    errors: []
  }
},
methods: {
  clearError() {
    this.errors.splice(0, 1);
  },
  appendError() {
    this.errors.splice(0, 0, 'error message B')
  },
  showValue() {
    console.log(this.boundValue)
  }
}

}

createApp(App).mount('#app')
</script>
</html>