2020-09-27 动态添加输入框，及绑定数据

需求：默认有一组输入框，可动态添加，支持删除！（ui基于vant-weapp)

wxml

  
    
      
      
      
        
      
    
    添加面值
  

  
    提 交
  
  

js

import Notify from '../../../miniprogram_npm/@vant/weapp/notify/notify';
Page({

  /**
   * 页面的初始数据
   */
  data: {
    listId: '',
    inputList: [{
      parValue: '',
      num: ''
    }]
  },

  onParValueChange: function (e) {
    let val = e.detail,
      i = e.currentTarget.dataset.index,
      item = this.data.inputList[i];
    item['parValue'] = val;
    console.log(item);
  },
  onNumChange: function (e) {
    let val = e.detail,
      i = e.currentTarget.dataset.index,
      item = this.data.inputList[i];
    item['num'] = val;
    console.log(item);
  },
  // 添加面值
  onAdd: function () {
    let obj = {
        parValue: '',
        num: ''
      },
      list = this.data.inputList;
    list.push(obj);
    this.setData({
      inputList: list
    });
    console.log(this.data);
  },
  // 删除面值
  onDelete: function (e) {
    let i = e.currentTarget.dataset.index,
      list = this.data.inputList;
    console.log(i);
    list.splice(i, 1);
    this.setData({
      inputList: list
    });
  },
  // 提交
  onSubmit: function (e) {
    console.log(this.data)
  },
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    if (options) {
      this.setData({
        listId: options.listId
      });
      wx.setNavigationBarTitle({
        title: options.title
      })
    }
  },

  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function () {

  },

  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {

  },

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {

  },

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {

  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {

  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {

  },

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {

  }
})

wxss

.input_item {
  position: relative;
  padding: 10rpx;
  border-radius: 5px;
}

.input_item .del_wrap {
  position: absolute;
  top: 0;
  right: 0;
  padding: 10rpx;
}

引入vant-weapp 组件的json

{
  "usingComponents": {
    "van-row": "@vant/weapp/row/index",
    "van-col": "@vant/weapp/col/index",
    "van-field": "@vant/weapp/field/index",
    "van-notify": "@vant/weapp/notify/index",
    "van-icon": "@vant/weapp/icon/index",
    "van-button": "@vant/weapp/button/index"
  }
}