Vue实战之数字输入框

作者: wenmingxing | 来源:发表于2020-02-16 16:01 被阅读0次

《Vue.js实战》学习笔记-组件示例（一）
Vue实战之数字输入框
elementUi-vue 常用知识点
vue 改变value 触发 v-model问题
Vue: 数字输入框组件
微信小程序input的type类型
el-input 数字校验
iOS - 输入框
常用的正则及输入框的验证
vue动态输入框

<!-- 入口页面 -->
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>input number</title>
    </head>

    <body>
        <div id="app">
            {{value}}
            <input-number v-model="value" :max="100" :min="-100" :step="5"></input-number>
        </div>

        <script src="https://unpkg.com/vue/dist/vue.min.js"></script>
        <script src="./input-number.js"></script>
        <script src="./index.js"></script>
    </body>
</html>

// 根实例
var app = new Vue({
    el: '#app',
    data: {
        value: 0
    }
});

// 数字输入框组件
function isValueNumber(value) {
    return (/(^-?[0-9]+\.{1}\d+$)|(^-?[1-9][0-9]*$)|(^-?0{1}$)/).test(value);
}

Vue.component('input-number', {
    template: '\
        <div class = "input-number">\
            <input \
                type="text"\
                :value="currentValue"\
                @change="handleChange">\
            <button \
                @click="handleDown"\
                :disabled="currentValue<=min">-</button> \
            <button \
                @click="handleUp" \
                :disabled="currentValue>=max">+</button>\
        </div>',
    props: {
        max: {
            type: Number,
            default: Infinity
        },
        min: {
            type: Number,
            default: -Infinity
        },
        //默认值
        value: {
            type: Number,
            default: 0
        },

        step: {
            type: Number,
            default: 1
        }
    },

    data: function() {
        return {
            currentValue: this.value
        }
    },

    watch: {
        currentValue: function(val) {
            this.$emit('input', val);
        },
        //监听value 将新值赋给currentValue
        value: function(val) {
            this.updateValue(val);
        }
    },

    methods: {
        updateValue: function(val) {
            if (val > this.max) val = this.max;
            if (val < this.min) val = this.min;
            this.currentValue = val;
        },

        handleDown: function() {
            if (this.currentValue <= this.min) return;
            this.currentValue -= this.step;
        },

        handleUp: function() {
            if (this.currentValue >= this.max) return;
            this.currentValue += this.step;
        },

        handleChange: function(event) {
            var val = event.target.value.trim();
            var max = this.max;
            var min = this.min;

            if (isValueNumber(val)) {
                val = Number(val);
                this.currentValue = val;

                if (val > max) {
                    this.currentValue = max;
                } else if (val < min) {
                    this.currentValue = min;
                }                
            } else {
                event.target.value = this.currentValue;
            }
        },
    },

    mounted: function() {
        this.updateValue(this.value);
    }
})

参考