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364 lines
11 KiB
364 lines
11 KiB
7 months ago
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<template>
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<view class="u-numberbox">
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<view class="u-icon-minus" @touchstart.stop.prevent="btnTouchStart('minus')" @touchend.stop.prevent="clearTimer" :class="{ 'u-icon-disabled': disabled || inputVal <= min }"
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:style="{
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background: bgColor,
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height: inputHeight + 'rpx',
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color: color
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}">
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<u-icon name="minus" :size="size"></u-icon>
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</view>
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<input :disabled="disabledInput || disabled" :cursor-spacing="getCursorSpacing" :class="{ 'u-input-disabled': disabled }"
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v-model="inputVal" class="u-number-input" @blur="onBlur" @focus="onFocus"
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type="number" :style="{
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color: color,
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fontSize: size + 'rpx',
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background: bgColor,
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height: inputHeight + 'rpx',
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width: inputWidth + 'rpx'
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}" />
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<view class="u-icon-plus" @touchstart.stop.prevent="btnTouchStart('plus')" @touchend.stop.prevent="clearTimer" :class="{ 'u-icon-disabled': disabled || inputVal >= max }"
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:style="{
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background: bgColor,
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height: inputHeight + 'rpx',
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color: color
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}">
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<u-icon name="plus" :size="size"></u-icon>
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</view>
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</view>
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</template>
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<script>
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/**
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* numberBox 步进器
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* @description 该组件一般用于商城购物选择物品数量的场景。注意:该输入框只能输入大于或等于0的整数,不支持小数输入
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* @tutorial https://www.uviewui.com/components/numberBox.html
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* @property {Number} value 输入框初始值(默认1)
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* @property {String} bg-color 输入框和按钮的背景颜色(默认#F2F3F5)
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* @property {Number} min 用户可输入的最小值(默认0)
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* @property {Number} max 用户可输入的最大值(默认99999)
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* @property {Number} step 步长,每次加或减的值(默认1)
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* @property {Boolean} disabled 是否禁用操作,禁用后无法加减或手动修改输入框的值(默认false)
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* @property {Boolean} disabled-input 是否禁止输入框手动输入值(默认false)
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* @property {Boolean} positive-integer 是否只能输入正整数(默认true)
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* @property {String | Number} size 输入框文字和按钮字体大小,单位rpx(默认26)
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* @property {String} color 输入框文字和加减按钮图标的颜色(默认#323233)
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* @property {String | Number} input-width 输入框宽度,单位rpx(默认80)
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* @property {String | Number} input-height 输入框和按钮的高度,单位rpx(默认50)
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* @property {String | Number} index 事件回调时用以区分当前发生变化的是哪个输入框
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* @property {Boolean} long-press 是否开启长按连续递增或递减(默认true)
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* @property {String | Number} press-time 开启长按触发后,每触发一次需要多久,单位ms(默认250)
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* @property {String | Number} cursor-spacing 指定光标于键盘的距离,避免键盘遮挡输入框,单位rpx(默认200)
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* @event {Function} change 输入框内容发生变化时触发,对象形式
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* @event {Function} blur 输入框失去焦点时触发,对象形式
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* @event {Function} minus 点击减少按钮时触发(按钮可点击情况下),对象形式
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* @event {Function} plus 点击增加按钮时触发(按钮可点击情况下),对象形式
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* @example <u-number-box :min="1" :max="100"></u-number-box>
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*/
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export default {
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name: "u-number-box",
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props: {
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// 预显示的数字
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value: {
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type: Number,
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default: 1
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},
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// 背景颜色
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bgColor: {
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type: String,
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default: '#F2F3F5'
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},
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// 最小值
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min: {
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type: Number,
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default: 0
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},
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// 最大值
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max: {
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type: Number,
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default: 99999
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},
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// 步进值,每次加或减的值
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step: {
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type: Number,
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default: 1
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},
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// 是否禁用加减操作
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disabled: {
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type: Boolean,
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default: false
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},
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// input的字体大小,单位rpx
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size: {
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type: [Number, String],
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default: 26
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},
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// 加减图标的颜色
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color: {
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type: String,
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default: '#323233'
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},
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// input宽度,单位rpx
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inputWidth: {
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type: [Number, String],
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default: 80
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},
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// input高度,单位rpx
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inputHeight: {
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type: [Number, String],
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default: 50
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},
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// index索引,用于列表中使用,让用户知道是哪个numberbox发生了变化,一般使用for循环出来的index值即可
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index: {
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type: [Number, String],
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default: ''
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},
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// 是否禁用输入框,与disabled作用于输入框时,为OR的关系,即想要禁用输入框,又可以加减的话
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// 设置disabled为false,disabledInput为true即可
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disabledInput: {
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type: Boolean,
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default: false
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},
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// 输入框于键盘之间的距离
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cursorSpacing: {
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type: [Number, String],
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default: 100
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},
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// 是否开启长按连续递增或递减
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longPress: {
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type: Boolean,
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default: true
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},
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// 开启长按触发后,每触发一次需要多久
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pressTime: {
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type: [Number, String],
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default: 250
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},
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// 是否只能输入大于或等于0的整数(正整数)
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positiveInteger: {
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type: Boolean,
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default: true
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}
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},
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watch: {
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value(v1, v2) {
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// 只有value的改变是来自外部的时候,才去同步inputVal的值,否则会造成循环错误
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if(!this.changeFromInner) {
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this.inputVal = v1;
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// 因为inputVal变化后,会触发this.handleChange(),在其中changeFromInner会再次被设置为true,
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// 造成外面修改值,也导致被认为是内部修改的混乱,这里进行this.$nextTick延时,保证在运行周期的最后处
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// 将changeFromInner设置为false
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this.$nextTick(function(){
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this.changeFromInner = false;
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})
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}
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},
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inputVal(v1, v2) {
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// 为了让用户能够删除所有输入值,重新输入内容,删除所有值后,内容为空字符串
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if (v1 == '') return;
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let value = 0;
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// 首先判断是否数值,并且在min和max之间,如果不是,使用原来值
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let tmp = this.$u.test.number(v1);
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if (tmp && v1 >= this.min && v1 <= this.max) value = v1;
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else value = v2;
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// 判断是否只能输入大于等于0的整数
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if(this.positiveInteger) {
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// 小于0,或者带有小数点,
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if(v1 < 0 || String(v1).indexOf('.') !== -1) {
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value = v2;
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// 双向绑定input的值,必须要使用$nextTick修改显示的值
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this.$nextTick(() => {
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this.inputVal = v2;
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})
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}
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}
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// 发出change事件
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this.handleChange(value, 'change');
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}
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},
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data() {
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return {
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inputVal: 1, // 输入框中的值,不能直接使用props中的value,因为应该改变props的状态
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timer: null, // 用作长按的定时器
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changeFromInner: false, // 值发生变化,是来自内部还是外部
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innerChangeTimer: null, // 内部定时器
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};
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},
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created() {
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this.inputVal = Number(this.value);
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},
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computed: {
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getCursorSpacing() {
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// 先将值转为px单位,再转为数值
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return Number(uni.upx2px(this.cursorSpacing));
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}
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},
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methods: {
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// 点击退格键
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btnTouchStart(callback) {
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// 先执行一遍方法,否则会造成松开手时,就执行了clearTimer,导致无法实现功能
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this[callback]();
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// 如果没开启长按功能,直接返回
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if (!this.longPress) return;
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clearInterval(this.timer); //再次清空定时器,防止重复注册定时器
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this.timer = null;
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this.timer = setInterval(() => {
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// 执行加或减函数
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this[callback]();
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}, this.pressTime);
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},
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clearTimer() {
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this.$nextTick(() => {
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clearInterval(this.timer);
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this.timer = null;
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})
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},
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minus() {
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this.computeVal('minus');
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},
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plus() {
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this.computeVal('plus');
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},
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// 为了保证小数相加减出现精度溢出的问题
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calcPlus(num1, num2) {
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let baseNum, baseNum1, baseNum2;
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try {
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baseNum1 = num1.toString().split('.')[1].length;
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} catch (e) {
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baseNum1 = 0;
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}
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try {
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baseNum2 = num2.toString().split('.')[1].length;
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} catch (e) {
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baseNum2 = 0;
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}
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baseNum = Math.pow(10, Math.max(baseNum1, baseNum2));
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let precision = baseNum1 >= baseNum2 ? baseNum1 : baseNum2; //精度
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return ((num1 * baseNum + num2 * baseNum) / baseNum).toFixed(precision);
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},
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// 为了保证小数相加减出现精度溢出的问题
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calcMinus(num1, num2) {
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let baseNum, baseNum1, baseNum2;
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try {
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baseNum1 = num1.toString().split('.')[1].length;
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} catch (e) {
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baseNum1 = 0;
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}
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try {
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baseNum2 = num2.toString().split('.')[1].length;
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} catch (e) {
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baseNum2 = 0;
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}
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baseNum = Math.pow(10, Math.max(baseNum1, baseNum2));
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let precision = baseNum1 >= baseNum2 ? baseNum1 : baseNum2;
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return ((num1 * baseNum - num2 * baseNum) / baseNum).toFixed(precision);
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},
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computeVal(type) {
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uni.hideKeyboard();
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if (this.disabled) return;
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let value = 0;
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// 减
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if (type === 'minus') {
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value = this.calcMinus(this.inputVal, this.step);
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} else if (type === 'plus') {
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value = this.calcPlus(this.inputVal, this.step);
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}
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// 判断是否小于最小值和大于最大值
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if (value < this.min || value > this.max) {
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return;
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}
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this.inputVal = value;
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this.handleChange(value, type);
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},
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// 处理用户手动输入的情况
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onBlur(event) {
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let val = 0;
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let value = event.detail.value;
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// 如果为非0-9数字组成,或者其第一位数值为0,直接让其等于min值
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// 这里不直接判断是否正整数,是因为用户传递的props min值可能为0
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if (!/(^\d+$)/.test(value) || value[0] == 0) val = this.min;
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val = +value;
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if (val > this.max) {
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val = this.max;
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} else if (val < this.min) {
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val = this.min;
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}
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this.$nextTick(() => {
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this.inputVal = val;
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})
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this.handleChange(val, 'blur');
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},
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// 输入框获得焦点事件
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onFocus() {
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this.$emit('focus');
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},
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handleChange(value, type) {
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if (this.disabled) return;
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// 清除定时器,避免造成混乱
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if(this.innerChangeTimer) {
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clearTimeout(this.innerChangeTimer);
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this.innerChangeTimer = null;
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}
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// 发出input事件,修改通过v-model绑定的值,达到双向绑定的效果
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this.changeFromInner = true;
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// 一定时间内,清除changeFromInner标记,否则内部值改变后
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// 外部通过程序修改value值,将会无效
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this.innerChangeTimer = setTimeout(() => {
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this.changeFromInner = false;
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}, 150);
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this.$emit('input', Number(value));
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this.$emit(type, {
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// 转为Number类型
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value: Number(value),
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index: this.index
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})
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}
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}
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};
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</script>
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<style lang="scss" scoped>
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@import "../../libs/css/style.components.scss";
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.u-numberbox {
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display: inline-flex;
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align-items: center;
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}
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.u-number-input {
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position: relative;
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text-align: center;
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padding: 0;
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margin: 0 6rpx;
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@include vue-flex;
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align-items: center;
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justify-content: center;
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}
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.u-icon-plus,
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.u-icon-minus {
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width: 60rpx;
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@include vue-flex;
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justify-content: center;
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align-items: center;
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}
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.u-icon-plus {
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border-radius: 0 8rpx 8rpx 0;
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}
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.u-icon-minus {
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border-radius: 8rpx 0 0 8rpx;
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}
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.u-icon-disabled {
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color: #c8c9cc !important;
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background: #f7f8fa !important;
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}
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.u-input-disabled {
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color: #c8c9cc !important;
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background-color: #f2f3f5 !important;
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}
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</style>
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