Vue.js 3.x SelectForm コンポーネント

select タグのエラーメッセージ表示付きコンポーネント

SelectForm.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 SelectForm = {
  template: `
    <div :class="computedControlWrapperClasses" :style="controlWrapperStyles">
      <select class="form-control"
        :class="controlClasses"
        :style="controlStyles"
        :value="value"
        v-bind="$attrs"
        @input="updateValue($event.target.value)"
        @change="changeValue($event.target.value)"
      >
        <option v-for="opt in computedOptions"
          :value="opt.value"
          :class="optionClasses"
          :style="optionStyles"
        >{{ opt.title }}</option>
      </select>
      <div :class="computedMessageWrapperClasses" :style="messageWrapperStyles">
        <template v-for="msg in errors">
          <span>{{ msg }}</span><br>
        </template>
      </div>
    </div>
  `,
  props: {
    value:                 { type: String },
    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: [] },
    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 updateValue(v) {
      context.emit('update:value', v)
    }
    function changeValue(v) {
      context.emit('change:value', v)
    }
    return {
      computedControlWrapperClasses,
      computedMessageWrapperClasses,
      computedOptions,
      changeValue,
      updateValue
    }
  }
};
export default SelectForm;

<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>
<select-form
  :options="['', 'ABC', 'XYZ', 'AAA']"
  :control-wrapper-classes="['col-sm-12']"
  :errors="errors"
  v-model:value="boundValue"
>
</select-form>
<br>
<h3>データバインディング確認用フォーム</h3>
<input type="text" class="form-control" v-model="boundValue">
<button @click="clearError">ClearError</button>
<button @click="appendError">AppendError</button>

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

const App = {

components: {
  selectForm: SelectForm
},
data() {
  return {
    boundValue: 'abc',
    errors: []
  }
},
methods: {
  clearError() {
    this.errors.splice(0, 1);
  },
  appendError() {
    this.errors.splice(0, 0, 'error message B')
  }
}

}

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