回答編集履歴
2
コメントを受けて追記
test
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[算出 Setter 関数 | 算出プロパティとウォッチャ — Vue.js](https://jp.vuejs.org/v2/guide/computed.html#%E7%AE%97%E5%87%BA-Setter-%E9%96%A2%E6%95%B0)
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---
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# コメントを受けて追記
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```html
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<body>
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<div id='app'>
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<div>
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<h1>sample</h1>
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<table class='table'>
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<thead>
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<tr>
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<th><input type='checkbox' v-model="isAllSelected"></input></th>
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<th>商品名</th>
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<th>単価</th>
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<th>数量</th>
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<th>消費税率</th>
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<th>税抜金額計</th>
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<th>消費税額</th>
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<th>合計金額</th>
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</tr>
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</thead>
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<tbody>
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<tr v-for='(detail,index) in details' v-bind:key='detail.id'>
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<th><input type='checkbox' v-model='detail.isChecked'></input></th>
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<th><input type='text'></th>
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<th><input type='number' v-model.number='detail.unitPrice' style="text-align:right"></th>
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<th><input type='number' v-model.number='detail.num' style="text-align:right"></th>
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<th><input type='number' v-model.number='detail.rate' style="text-align:right"></th>
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<th>{{ (detail.unitPrice * detail.num).toLocaleString()}} </th>
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<th>{{ (detail.unitPrice * detail.num * detail.rate/100).toLocaleString()}} </th>
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<th>{{ ((detail.unitPrice * detail.num ) + (detail.unitPrice * detail.num *
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detail.rate/100)).toLocaleString() }} </th>
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<th><button @click='deleteRow(index)'>削除</button></th>
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</tr>
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</tbody>
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</table>
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<button @click='addRow'>行を追加</button>
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<p>税抜金額計{{ totalPrice.toLocaleString() }}円</p>
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<p>消費税額計{{ totalTax.toLocaleString() }}円</p>
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<p>税込金額計{{ totalPriceWithTax.toLocaleString() }}円</p>
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</div>
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</div>
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<script src='https://unpkg.com/vue'></script>
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</body>
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<script>
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let app = new Vue({
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el: '#app',
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data() {
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return {
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details: [{
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isChecked: false,
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unitPrice: '',
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num: '',
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rate: 10
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}]
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}
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},
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computed: {
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//税抜金額計
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totalPrice: function () {
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return this.details.filter(x => x.isChecked).reduce((sum, detail) => sum + detail.unitPrice * detail.num, 0);
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},
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//消費税計
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totalTax: function () {
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return this.details.filter(x => x.isChecked).reduce((sum, detail) => sum + detail.unitPrice * detail.num * detail.rate / 100, 0);
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},
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//税込額計
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totalPriceWithTax: function () {
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return this.details.filter(x => x.isChecked).reduce((sum, detail) => sum + (detail.unitPrice * detail.num) + (detail.unitPrice * detail.num * detail.rate / 100), 0);
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},
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isAllSelected: {
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get: function () {
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return !this.details.some(x => !x.isChecked)
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},
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set: function (bool) {
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if (bool) {
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this.details.forEach(x => x.isChecked = true);
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} else {
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this.details.forEach(x => x.isChecked = false);
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}
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}
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}
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},
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methods: {
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//行追加
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addRow: function () {
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this.details.push({
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isChecked: false,
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unitPrice: '',
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num: '',
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rate: 10
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})
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},
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//行削除
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deleteRow: function (index) {
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this.details.splice(index, 1)
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}
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}
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})
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</script>
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```
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1
別解
test
CHANGED
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@@ -7,3 +7,45 @@
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解決方法ですが、details配列すべての要素にアクセスして`isChecked`を変更するのがいいでしょう。
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---
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セッタを使う方がスマートかも。
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```js
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isAllSelected: {
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get: function () {
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return !this.details.some(x => !x.isChecked)
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},
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set: function (bool) {
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if (bool) {
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this.details.forEach(x => x.isChecked = true);
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} else {
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this.details.forEach(x => x.isChecked = false);
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}
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}
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}
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```
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[算出 Setter 関数 | 算出プロパティとウォッチャ — Vue.js](https://jp.vuejs.org/v2/guide/computed.html#%E7%AE%97%E5%87%BA-Setter-%E9%96%A2%E6%95%B0)
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