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<template>
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<view class="u-char-box">
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<view class="u-char-flex">
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<input :disabled="disabledKeyboard" :value="valueModel" type="number" :focus="focus" :maxlength="maxlength" class="u-input" @input="getVal"/>
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<view v-for="(item, index) in loopCharArr" :key="index">
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<view :class="[breathe && charArrLength == index ? 'u-breathe' : '', 'u-char-item',
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charArrLength === index && mode == 'box' ? 'u-box-active' : '',
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mode === 'box' ? 'u-box' : '']" :style="{
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fontWeight: bold ? 'bold' : 'normal',
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fontSize: fontSize + 'rpx',
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width: width + 'rpx',
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height: width + 'rpx',
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color: inactiveColor,
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borderColor: charArrLength === index && mode == 'box' ? activeColor : inactiveColor
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}">
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<view class="u-placeholder-line" :style="{
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display: charArrLength === index ? 'block' : 'none',
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height: width * 0.5 +'rpx'
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}"
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v-if="mode !== 'middleLine'"
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></view>
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<view v-if="mode === 'middleLine' && charArrLength <= index" :class="[breathe && charArrLength == index ? 'u-breathe' : '', charArrLength === index ? 'u-middle-line-active' : '']"
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class="u-middle-line" :style="{height: bold ? '4px' : '2px', background: charArrLength === index ? activeColor : inactiveColor}"></view>
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<view v-if="mode === 'bottomLine'" :class="[breathe && charArrLength == index ? 'u-breathe' : '', charArrLength === index ? 'u-bottom-line-active' : '']"
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class="u-bottom-line" :style="{height: bold ? '4px' : '2px', background: charArrLength === index ? activeColor : inactiveColor}"></view>
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<block v-if="!dotFill"> {{ charArr[index] ? charArr[index] : ''}}</block>
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<block v-else>
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<text class="u-dot">{{ charArr[index] ? '●' : ''}}</text>
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</block>
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</view>
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</view>
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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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* messageInput 验证码输入框
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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的键盘组件使用
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* @tutorial https://www.uviewui.com/components/messageInput.html
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* @property {String Number} maxlength 输入字符个数（默认4）
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* @property {Boolean} dot-fill 是否用圆点填充（默认false）
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* @property {String} mode 模式选择，见上方"基本使用"说明（默认box）
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* @property {String Number} value 预置值
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* @property {Boolean} breathe 是否开启呼吸效果，见上方说明（默认true）
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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true）
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* @property {String Number} font-size 字体大小，单位rpx（默认60）
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* @property {String} active-color 当前激活输入框的样式（默认#2979ff）
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* @property {String} inactive-color 非激活输入框的样式，文字颜色同此值（默认#606266）
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* @property {String | Number} width 输入框宽度，单位rpx，高等于宽（默认80）
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* @property {Boolean} disabled-keyboard 禁止点击输入框唤起系统键盘（默认false）
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* @event {Function} change 输入内容发生改变时触发，具体见官网说明
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* @event {Function} finish 输入字符个数达maxlength值时触发，见官网说明
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* @example <u-message-input mode="bottomLine"></u-message-input>
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*/
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export default {
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name: "u-message-input",
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props: {
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// 最大输入长度
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maxlength: {
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type: [Number, String],
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default: 4
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},
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// 是否用圆点填充
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dotFill: {
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type: Boolean,
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default: false
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},
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// 显示模式，box-盒子模式，bottomLine-横线在底部模式，middleLine-横线在中部模式
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mode: {
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type: String,
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default: "box"
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},
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// 预置值
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modelValue: {
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type: [String, Number],
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default: ''
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},
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// 当前激活输入item，是否带有呼吸效果
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breathe: {
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type: Boolean,
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default: true
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},
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// 是否自动获取焦点
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focus: {
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type: Boolean,
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default: false
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},
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// 字体是否加粗
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bold: {
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type: Boolean,
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default: false
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},
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// 字体大小
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fontSize: {
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type: [String, Number],
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default: 60
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},
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// 激活样式
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activeColor: {
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type: String,
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default: '#2979ff'
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},
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// 未激活的样式
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inactiveColor: {
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type: String,
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default: '#606266'
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},
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// 输入框的大小，单位rpx，宽等于高
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width: {
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type: [Number, String],
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default: '80'
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},
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// 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
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disabledKeyboard: {
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type: Boolean,
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default: false
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}
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},
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watch: {
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// maxlength: {
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// // 此值设置为true，会在组件加载后无需maxlength变化就会执行一次本监听函数，无需再created生命周期中处理
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// immediate: true,
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// handler(val) {
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// this.maxlength = Number(val);
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// }
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// },
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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
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val = String(val);
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// 超出部分截掉
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this.valueModel = val.substring(0, this.maxlength);
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}
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},
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},
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data() {
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return {
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valueModel: ""
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}
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},
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emits: ['change', 'finish'],
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computed: {
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// 是否显示呼吸灯效果
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animationClass() {
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return (index) => {
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if (this.breathe && this.charArr.length == index) return 'u-breathe';
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else return '';
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}
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},
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// 用于显示字符
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charArr() {
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return this.valueModel.split('');
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},
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charArrLength() {
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return this.charArr.length;
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},
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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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loopCharArr() {
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return new Array(this.maxlength);
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}
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},
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methods: {
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getVal(e) {
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let {
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value
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} = e.detail
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this.valueModel = value;
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// 判断长度是否超出了maxlength值，理论上不会发生，因为input组件设置了maxlength属性值
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if (String(value).length > this.maxlength) return;
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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.$emit('change', value);
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if (String(value).length == this.maxlength) {
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this.$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 scoped lang="scss">
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// 定义混入指令，用于在非nvue环境下的flex定义，因为nvue没有display属性，会报错
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@mixin vue-flex($direction: row) {
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/* #ifndef APP-NVUE */
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display: flex;
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flex-direction: $direction;
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/* #endif */
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}
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@keyframes breathe {
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0% {
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opacity: 0.3;
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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: 0.3;
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}
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}
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.u-char-box {
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text-align: center;
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}
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.u-char-flex {
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@include vue-flex;
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justify-content: center;
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flex-wrap: wrap;
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position: relative;
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}
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.u-input {
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position: absolute;
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top: 0;
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left: -100%;
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width: 200%;
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height: 100%;
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text-align: left;
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z-index: 9;
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opacity: 0;
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background: none;
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}
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.u-char-item {
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position: relative;
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width: 90rpx;
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height: 90rpx;
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margin: 10rpx 10rpx;
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font-size: 60rpx;
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font-weight: bold;
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color: $u-main-color;
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line-height: 90rpx;
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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-middle-line {
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border: none;
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}
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.u-box {
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box-sizing: border-box;
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border: 2rpx solid #cccccc;
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border-radius: 6rpx;
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}
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.u-box-active {
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overflow: hidden;
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animation-timing-function: ease-in-out;
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animation-duration: 1500ms;
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animation-iteration-count: infinite;
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animation-direction: alternate;
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border: 2rpx solid $u-primary;
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}
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.u-middle-line-active {
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background: $u-primary;
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}
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.u-breathe {
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animation: breathe 2s infinite ease;
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}
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.u-placeholder-line {
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/* #ifndef APP-NVUE */
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display: none;
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/* #endif */
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position: absolute;
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left: 50%;
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top: 50%;
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transform: translate(-50%, -50%);
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width: 2rpx;
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height: 40rpx;
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background: #333333;
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animation: twinkling 1.5s infinite ease;
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}
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.u-animation-breathe {
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animation-name: breathe;
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}
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.u-dot {
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font-size: 34rpx;
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line-height: 34rpx;
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}
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.u-middle-line {
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height: 4px;
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background: #000000;
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width: 80%;
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position: absolute;
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border-radius: 2px;
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top: 50%;
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left: 50%;
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transform: translate(-50%, -50%);
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}
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.u-bottom-line-active {
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background: $u-primary;
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}
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.u-bottom-line {
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height: 4px;
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background: #000000;
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width: 80%;
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position: absolute;
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border-radius: 2px;
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bottom: 0;
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left: 50%;
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transform: translate(-50%);
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}
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</style>
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