uni-app/vue封装etc车牌照输入,获取键盘按键键值

先看下效果如下：

动态图如下

uniapp的keyup获取不到keyCode和compositionstart，compositionend，所以需要监听input节点的keyup事件，

思路以及代码如下：
1.将每一个字符用文本框输入，代码如下

<view class="license-input"><input type="text" class="input-code code0" /><input type="text" class="input-code code1" />...
</view>

2.初始化的时候将input下的真是inputdom绑定keyup事件调用skipnext，并传入每一个input的index,同时绑定compositionstart和compositionend

mounted(){document.querySelectorAll(".input-code").forEach((el, index) => {const input = el.querySelector("input");if (index > 0) {input.disabled = true;}input.addEventListener("keyup", (event) => {this.skipnext(index, event);});input.addEventListener("compositionstart", this.inputstart);input.addEventListener("compositionend", this.inputend);});
}

3.对按键进行处理，如果当前文本框已经输入完成则跳转到下一个文本框，如果没有则停留在当前文本框，第一次输入的时候，前面的没有输入完成，则不可跳过前面的号码去输入后面的号码，当删除后则解除禁止

完整代码如下：
新建license-input.vue文件，

<template><view class="license-input"><input type="text" class="input-code code0" /><input type="text" class="input-code code1" /><span class="dian">·</span><input type="tel" class="input-code code2" /><input type="tel" class="input-code code3" /><input type="tel" class="input-code code4" /><input type="tel" class="input-code code5" /><input type="tel" class="input-code code6" /></view>
</template><script>
/***  车牌照输入* ===== 使用场景 ======* 下单页面ETC**/
export default {name: "license-input",props: {carvalue: {type: String,default: "",},},mounted() {this.setEvent();},methods: {setEvent() {const v = this.carvalue.split("");document.querySelectorAll(".input-code").forEach((el, index) => {const input = el.querySelector("input");input.value = v[index] || "";if (index > 0) {input.disabled = true;}input.addEventListener("keyup", (event) => {this.skipnext(index, event);});input.addEventListener("compositionstart", this.inputstart);input.addEventListener("compositionend", this.inputend);});this.$emit("input", this.carvalue);},getVal() {let val = "";document.querySelectorAll(".input-code").forEach((el, index) => {val += el.querySelector("input").value;});return val;},skipnext(num, e) {const keycode = e.keyCode || e.which;if (e.target.timer) {clearTimeout(e.target.timer);e.target.timer = null;}// tab,ctrl,回车，Enter等可自定排除if (keycode == 9 || keycode == 13 || keycode == 18 || keycode == 32) {return;}//删除按键if (keycode == 8) {if (num > 0 && !e.target.value) {const prevel = document.querySelector(`.code${num - 1}`).querySelector("input");//   e.target.disabled = true; // 删除后将disabled 设置为trueprevel.focus();}this.$emit("input", this.getVal());return;}if (num < 6 && !e.target.hascom) {const nextel = document.querySelector(`.code${num + 1}`).querySelector("input");// 添加延迟，防止过快输入。e.target.timer = setTimeout(() => {nextel.disabled = false;nextel.focus();}, 300);}// 只能输入一个字符if (e.target.value.length > 1 && !e.target.hascom) {e.target.value = e.target.value.substr(e.target.value.length-1, 1);}this.$emit("input", this.getVal());},inputstart(e) {e.target.hascom = true;},inputend(e) {e.target.hascom = false;},},
};
</script>
<style>...</style>

父组件使用

<license-input carvalue="浙A12345" @input="(e) => {carmodel = e}"></license-input>车牌为：{{carmodel }}import licenseInput from "@/components/license-input.vue";