VUE2实现事件驱动弹窗示例

时间:2020-05-16 ermu 人气:0

前几天想了解vue如何写弹窗组件

有以下两种可取的写法：

1.状态管理如果弹窗组件放在根组件，使用vuex来管理组件的show和hide。放在组件内，通过增加v-show或v-if来控制，可结合slot，定义不同需求的弹窗

2.事件管理注册一个全局事件来打开弹窗，传入需展示的文字和相关的逻辑控制，可结合promise，实现异步

觉得对用像confirme和propmt这类弹窗，还是事件驱动的好。最好就是能使用promise回调。

于是手痒就写了一个。下面是代码。

propmt.js

import Vue from 'vue'
import promptComponent from './prompt.vue' // 引入弹窗的vue文件
const promptConstructor = Vue.extend(promptComponent); // 注册组件
let instance = new promptConstructor().$mount(''); // 获得组件的实例

document.body.appendChild(instance.$el); // 将组件的element插入到body中
const Alert = (text,okText)=>{
  if(instance.show === true) { //防止多次触发
    return;
  }
  // 为弹窗数据赋值
  instance.show = true; 
  instance.isAlert = true;
  instance.okText = okText||'确定';
  instance.message = text;
  //返回一个promise对象，并为按钮添加事件监听
  return new Promise(function(resolve,reject) {
    instance.$refs.okBtn.addEventListener('click',function() {
      instance.show = false;
      resolve(true);
    })
  })
};
const Confirm = (text,okText,cancelText)=>{
  if(instance.show === true) {
    return;
  }
  instance.show = true;
  instance.okText = okText||'确定';
  instance.cancelText = cancelText||'取消';
  instance.message = text;
  return new Promise(function(resolve,reject) {
    instance.$refs.cancelBtn.addEventListener('click',function() {
      instance.show = false;
      resolve(false);
    });
    instance.$refs.okBtn.addEventListener('click',function() {
      instance.show = false;
      resolve(true);
    })
  })
};
const Prompt = (text,okText,inputType, defaultValue)=>{
  if(instance.show === true) {
    return;
  }
  instance.show = true;
  instance.isPrompt = true;
  instance.okText = okText||'确定';
  instance.message = text;
  instance.inputType = inputType || 'text';
  instance.inputValue = defaultValue || '';
  return new Promise(function(resolve,reject) {
    instance.$refs.okBtn.addEventListener('click',function() {
      instance.show = false;
      resolve(instance.inputValue);
    })
  })
};

export {Alert,Confirm,Prompt}

prompt.vue

<style lang="less" scoped>
  .confirm-enter-active {
    transition: all .2s;
  }

  .confirm-leave-active {
    transition: opacity .2s;
  }

  .confirm-leave-to {
    opacity: 0;
  }

  .confirm-enter {
    opacity: 0;
  }

  .confirm {
    position: relative;
    font-family: PingFangSC-Regular;
    font-size: 17px;
    -webkit-user-select: none;
    user-select: none;
    // 遮罩层样式
    .masker {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(0, 0, 0, .4);
      -webkit-transition: opacity .1s linear;
      transition: opacity .1s linear;
      z-index: 100;
    }
    // 入库数据错误样式
    .box {
      position: absolute;
      top: 50%;
      left: 50%;
      width: 72%;
      -webkit-transform: translate(-50%, -50%);
      transform: translate(-50%, -50%);
      text-align: center;
      border-radius: 12px;
      background-color: #fff;
      .message {
        height: 97px;
        line-height: 24px;
        font-family: PingFangSC-Regular;
        font-size: 17px;
        vertical-align: middle;
        color: #999;
        letter-spacing: -0.41px;
        p {
          margin: 20px auto 0 auto;
          vertical-align: middle;
        }
        &::after {
          content: '';
          height: 100%;
        }
      }
      .prompt {
        margin: 20px 0;
        width: 100%;
        p {
          margin: 5px auto;
          font-size: 17px;
          line-height: 24px;
        }
        input {
          margin: 5px auto;
          border: 1px solid #333;
          border-radius: 6px;
          width: 100px;
          height: 30px;
          font-size: 14px;
          line-height: 20px;
          text-align: center;
        }
      }
      .button-group {
        a {
          width: calc(50% - 0.5px);
          text-align: center;
          font-size: 17px;
          line-height: 43px;
          color: blue;
        }
        .max-width {
          width: 100% !important;;
        }
      }
    }
  }
</style>
<template>
  <transition name="confirm">
    <div class="confirm" v-show="show">
      <div class="masker" @touchmove.prevent>
        <div class="box">
          <div class="message" v-if="!isPrompt">
            <p>{{message}}</p>
          </div>
          <div class="prompt" v-if="isPrompt">
            <p>{{message}}</p>
            <input type="text" v-model="inputValue" v-if="inputType === 'text'" ref="inputEl">
            <input type="tel" v-model.number="inputValue" @keydown="enterCheck" v-if="inputType === 'tel'" ref="inputEl">
          </div>
          <div class="button-group clearfix bd-top">
            <a class="bd-right fl" ref="cancelBtn" v-show="!isAlert && !isPrompt">{{cancelText}}</a>
            <a class="fr" ref="okBtn" :class="{'max-width': isAlert || isPrompt}">{{okText}}</a>
          </div>
        </div>
      </div>
    </div>
  </transition>
</template>
<script type="text/ecmascript-6">
  import {mapState} from 'vuex'
  export default{
    data() {
      return {
        show: false,
        message: '请输入提示语',
        okText: '确定',
        cancelText: '取消',
        isAlert: false,
        isPrompt: false,
        inputValue: '',
        inputType: ''
      }
    },
    methods: {
      // 金额输入框校验
      enterCheck(event) {
        // 只允许输入数字,删除键,11位数字
        if (event.keyCode === 46 || event.keyCode === 8) {
          return;
        }
        if (event.keyCode < 47 || event.keyCode > 58 || event.keyCode === 190) {
          event.returnValue = false;
        }
      },
    },
    watch: {
      show(){
        if (this.show) {
          this.$nextTick(() => {
            console.log(this.$refs.inputEl);
            console.log(this.inputType);
            this.$refs.inputEl.focus();
          });
        }
      }
    }
  }
</script>

main.js

import {Alert,Prompt,Confirm} from '../lib/components/prompt/prompt.js'

Vue.prototype.Alert = function(text,okText) {
  return Alert(text,okText)
};
Vue.prototype.Confirm = function(text,okText,cancelText) {
  return Confirm(text,okText,cancelText)
};
Vue.prototype.Prompt = function(text,okText,inputType, defaultValue) {
  return Prompt(text,okText,inputType, defaultValue)
};
component.vue:

inputName() {
  this.Prompt('请输入名称','确认','text').then(res =>{
    // do something use res
  });
},

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