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<template>
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<view class="u-code-input">
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<view
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class="u-code-input__item"
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:style="[itemStyle(index)]"
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v-for="(item, index) in codeLength"
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:key="index"
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>
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<view
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class="u-code-input__item__dot"
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v-if="dot && codeArray.length > index"
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></view>
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<text
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v-else
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:style="{
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fontSize: addUnit(fontSize),
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fontWeight: bold ? 'bold' : 'normal',
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color: color
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}"
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>{{codeArray[index]}}</text>
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<view
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class="u-code-input__item__line"
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v-if="mode === 'line'"
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:style="[lineStyle]"
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></view>
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<!-- #ifndef APP-NVUE -->
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<view v-if="isFocus && codeArray.length === index"
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:style="{backgroundColor: color}" class="u-code-input__item__cursor"></view>
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<!-- #endif -->
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<!-- #ifdef APP-NVUE -->
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<view v-if="isFocus && codeArray.length === index"
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:style="{backgroundColor: color, opacity: opacity}" class="u-code-input__item__cursor"></view>
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<!-- #endif -->
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</view>
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<input
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:disabled="disabledKeyboard"
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type="number"
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:focus="focus"
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:value="inputValue"
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:maxlength="maxlength"
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:adjustPosition="adjustPosition"
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class="u-code-input__input"
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@input="inputHandler"
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:style="{
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height: addUnit(size)
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}"
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@focus="isFocus = true"
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@blur="isFocus = false"
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/>
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</view>
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</template>
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<script>
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import { props } from './props';
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import { mpMixin } from '../../libs/mixin/mpMixin';
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import { mixin } from '../../libs/mixin/mixin';
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import { addUnit, getPx } from '../../libs/function/index';
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/**
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* CodeInput 验证码输入
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* @description 该组件一般用于验证用户短信验证码的场景，也可以结合uview-plus的键盘组件使用
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* @tutorial https://ijry.github.io/uview-plus/components/codeInput.html
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* @property {String | Number} maxlength 最大输入长度 （默认 6 ）
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* @property {Boolean} dot 是否用圆点填充 （默认 false ）
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* @property {String} mode 显示模式，box-盒子模式，line-底部横线模式 （默认 'box' ）
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* @property {Boolean} hairline 是否细边框 （默认 false ）
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* @property {String | Number} space 字符间的距离 （默认 10 ）
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* @property {String | Number} value 预置值
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* @property {Boolean} focus 是否自动获取焦点 （默认 false ）
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* @property {Boolean} bold 字体和输入横线是否加粗 （默认 false ）
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* @property {String} color 字体颜色 （默认 '#606266' ）
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* @property {String | Number} fontSize 字体大小，单位px （默认 18 ）
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* @property {String | Number} size 输入框的大小，宽等于高 （默认 35 ）
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* @property {Boolean} disabledKeyboard 是否隐藏原生键盘，如果想用自定义键盘的话，需设置此参数为true （默认 false ）
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* @property {String} borderColor 边框和线条颜色 （默认 '#c9cacc' ）
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* @property {Boolean} disabledDot 是否禁止输入"."符号 （默认 true ）
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*
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* @event {Function} change 输入内容发生改变时触发，具体见上方说明 value：当前输入的值
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* @event {Function} finish 输入字符个数达maxlength值时触发，见上方说明 value：当前输入的值
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* @example <u-code-input v-model="value4" :focus="true"></u-code-input>
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*/
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export default {
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name: 'u-code-input',
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mixins: [mpMixin, mixin, props],
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data() {
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return {
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inputValue: '',
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isFocus: this.focus,
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timer: null,
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opacity: 1
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}
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},
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watch: {
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// #ifdef VUE2
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value: {
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immediate: true,
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handler(val) {
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// 转为字符串，超出部分截掉
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this.inputValue = String(val).substring(0, this.maxlength)
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}
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},
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// #endif
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// #ifdef VUE3
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modelValue: {
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immediate: true,
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handler(val) {
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// 转为字符串，超出部分截掉
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this.inputValue = String(val).substring(0, this.maxlength)
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}
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},
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// #endif
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isFocus: {
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handler(val) {
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// #ifdef APP-NVUE
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if (val) {
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this.timer = setInterval(() => {
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this.opacity = Math.abs(this.opacity - 1)
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}, 600)
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} else {
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clearInterval(this.timer)
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}
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// #endif
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}
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}
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},
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created() {
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},
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beforeUnmount() {
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// #ifdef APP-NVUE
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clearInterval(this.timer)
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// #endif
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},
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computed: {
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// 根据长度，循环输入框的个数，因为头条小程序数值不能用于v-for
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codeLength() {
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return new Array(Number(this.maxlength))
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},
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// 循环item的样式
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itemStyle() {
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return index => {
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const style = {
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width: addUnit(this.size),
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height: addUnit(this.size)
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}
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// 盒子模式下，需要额外进行处理
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if (this.mode === 'box') {
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// 设置盒子的边框，如果是细边框，则设置为0.5px宽度
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style.border = `${this.hairline ? 0.5 : 1}px solid ${this.borderColor}`
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// 如果盒子间距为0的话
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if (getPx(this.space) === 0) {
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// 给第一和最后一个盒子设置圆角
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if (index === 0) {
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style.borderTopLeftRadius = '3px'
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style.borderBottomLeftRadius = '3px'
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}
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if (index === this.codeLength.length - 1) {
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style.borderTopRightRadius = '3px'
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style.borderBottomRightRadius = '3px'
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}
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// 最后一个盒子的右边框需要保留
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if (index !== this.codeLength.length - 1) {
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style.borderRight = 'none'
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}
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}
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}
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if (index !== this.codeLength.length - 1) {
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// 设置验证码字符之间的距离，通过margin-right设置，最后一个字符，无需右边框
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style.marginRight = addUnit(this.space)
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} else {
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// 最后一个盒子的有边框需要保留
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style.marginRight = 0
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}
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return style
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}
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},
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// 将输入的值，转为数组，给item历遍时，根据当前的索引显示数组的元素
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codeArray() {
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return String(this.inputValue).split('')
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},
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// 下划线模式下，横线的样式
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lineStyle() {
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const style = {}
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style.height = this.hairline ? '2px' : '4px'
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style.width = addUnit(this.size)
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// 线条模式下，背景色即为边框颜色
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style.backgroundColor = this.borderColor
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return style
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}
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},
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emits: ["change", 'finish', "update:modelValue"],
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methods: {
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addUnit,
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// 监听输入框的值发生变化
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inputHandler(e) {
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const value = e.detail.value
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this.inputValue = value
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// 是否允许输入“.”符号
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if(this.disabledDot) {
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this.$nextTick(() => {
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this.inputValue = value.replace('.', '')
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})
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}
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// 未达到maxlength之前，发送change事件，达到后发送finish事件
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this.$emit('change', value)
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// 修改通过v-model双向绑定的值
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// #ifdef VUE3
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this.$emit("update:modelValue", value);
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// #endif
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// #ifdef VUE2
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this.$emit("input", value);
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// #endif
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// 达到用户指定输入长度时，发出完成事件
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if (String(value).length >= Number(this.maxlength)) {
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this.$emit('finish', value)
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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/components.scss";
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$u-code-input-cursor-width: 1px;
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$u-code-input-cursor-height: 20px;
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$u-code-input-cursor-animation-duration: 1s;
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$u-code-input-cursor-animation-name: u-cursor-flicker;
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.u-code-input {
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@include flex;
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position: relative;
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overflow: hidden;
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&__item {
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@include flex;
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justify-content: center;
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align-items: center;
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position: relative;
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&__text {
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font-size: 15px;
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color: $u-content-color;
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}
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&__dot {
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width: 7px;
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height: 7px;
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border-radius: 100px;
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background-color: $u-content-color;
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}
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&__line {
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position: absolute;
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bottom: 0;
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height: 4px;
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border-radius: 100px;
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width: 40px;
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background-color: $u-content-color;
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}
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&__cursor {
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position: absolute;
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/* #ifndef APP-NVUE */
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top: 50%;
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left: 50%;
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opacity: 1;
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transform: translate(-50%,-50%);
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/* #endif */
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width: $u-code-input-cursor-width;
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height: $u-code-input-cursor-height;
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animation: $u-code-input-cursor-animation-duration u-cursor-flicker infinite;
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}
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}
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&__input {
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// 之所以需要input输入框，是因为有它才能唤起键盘
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// 这里将它设置为两倍的屏幕宽度，再将左边的一半移出屏幕，为了不让用户看到输入的内容
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position: absolute;
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left: -750rpx;
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width: 1500rpx;
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top: 0;
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background-color: transparent;
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text-align: left;
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}
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}
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/* #ifndef APP-NVUE */
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@keyframes u-cursor-flicker {
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0% {
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opacity: 0;
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}
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50% {
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opacity: 1;
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}
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100% {
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opacity: 0;
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}
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}
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/* #endif */
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</style>
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