自定义事件也可以用来创建自定义的表单输入组件,使用 v-model
来进行数据双向绑定。
所以要让组件的 v-model
生效,它必须:
value
属性在有新的 value 时触发 input
事件代码如下:HTML:<div id="app"> <p>{{ message }}</p> <currency-input label="PRice" v-model="price"></currency-input> <currency-input label="Shipping" v-model="shipping"></currency-input> <currency-input label="Handling" v-model="handling"></currency-input> <currency-input label="Discount" v-model="discount"></currency-input> <p>Total: ${{ total }}</p></div>javaScript:Vue.component('currency-input', { template: `/ <div>/ <label v-if="label">{{ label }}</label>/ $/ <input/ ref="input"/ v-bind:value="value"/ v-on:input="updateValue($event.target.value)"/ v-on:focus="selectAll"/ v-on:blur="formatValue"/ >/ </div>/ `, props: { value: { type: Number, default: 0 }, label: { type: String, default: '' } }, mounted: function () { this.formatValue() }, methods: { updateValue: function (value) { var result = currencyValidator.parse(value, this.value) if (result.warning) { this.$refs.input.value = result.value } this.$emit('input', result.value) }, formatValue: function () { this.$refs.input.value = currencyValidator.format(this.value) }, selectAll: function (event) { setTimeout(function () { event.target.select() }, 0) } }})new Vue({ el: '#app', data: { message: 'Hello Vue.js!', price: 0, shipping: 0, handling: 0, discount: 0 }, computed: { total: function () { return (( this.price * 100 + this.shipping * 100 + this.handling * 100 - this.discount * 10 ) / 100).toFixed(2) } }})效果图如下:每个 Vue 实例都实现了事件接口(Events interface),即:
使用$on(eventName)
监听事件使用 $emit(eventName)
触发事件v-model实现双向传递。新闻热点
疑难解答