微信小程序 动态添加view组件

时间:2024-05-19 08:20:26

在web中,我们动态添加DOM,可以用jQuery的方法,很简单。在微信小程序中怎么实现下面这么需求。

微信小程序 动态添加view组件
其中,里程数代表上一行到这一行地方的距离(这个不重要);要实现的就是点击增加途径地,就多一行,删除途径地,就少一行。

分析:添加的和删除的是同样的结构,只是数量不一样,所以考虑循环,用列表表示,增加就往这个列表push一个,删除就从列表pop一个。

主要代码如下:

<view class="weui-cell weui-cell_input">
	<view class="weui-cell__hd">
		<view class="weui-label rui-justify">
			<text space="ensp">出 发 地</text>
		</view>
	</view>
	<view class="weui-cell__bd">
		<input class="weui-input" name="beginAddress" bindinput="inputedit" data-obj="info" data-item="beginAddress" value="{{info.beginAddress}}"
		 placeholder="请输入出发地" disabled="{{info.isPreDetail}}" />
	</view>
</view>

<view wx:for="{{info.details}}" wx:key="key" class="forItemBorder">
	<view class="weui-cell weui-cell_input ">
		<view class="weui-cell__hd">
			<view class="weui-label rui-justify">
				<text space="ensp">途 径 地</text>
			</view>
		</view>
		<input class="weui-input" id="place-{{index}}" bindinput="setPlace" placeholder="请输入途径地" />
		<input class="weui-input lcs" id="number-{{index}}" bindinput="setNumber" placeholder="里程数(km)" />
	</view>
</view>

<view class="weui-cell weui-cell_input">
	<view class="weui-cell__hd">
		<view class="weui-label rui-justify">
			<text space="ensp">目 的 地</text>
		</view>
	</view>
	<input class="weui-input" name="destination" bindinput="inputedit" data-obj="info" data-item="destination" value="{{info.destination}}"
	 placeholder="请输入目的地" disabled="{{info.isPreDetail}}" />
	<input class="weui-input lcs" name="endLength" bindinput="inputedit" data-obj="info" data-item="endLength" value="{{info.endLength}}"
	 placeholder="里程数(km)" disabled="{{info.isPreDetail}}" />
</view>

<view class="weui-cell" hidden="{{info.isPreDetail}}">
	<button type='primary' bindtap='addItem' style='width:50%;'>增加途径地</button>
	<button type='primary' bindtap='removeItem' style='width:50%;margin-left:5rpx;'>
		删除途径地
	</button>
</view>

因为添加删除的是相同的结构,所以我构造了一个类Detail来表示这个view

/**
 * Detail类 构造函数 
 * @param {string} placeName 途径地
 * @param {string} number 里程数
 */
function Detail(placeName, number) {
  this.placeName = placeName;
  this.number = number;
}
function Info() {
  this.details = [];
}

Page({
  data: {
    info: {}
  },
  init: function () {
    let that = this;
    this.setData({
      info: new Info(),
    });
  },
  onLoad: function (options) {
    this.init();
  },
  addItem: function (e) {
    let info = this.data.info;
    info.details.push(new Detail());
    this.setData({
      info: info
    });
  },
  removeItem: function (e) {
    let info = this.data.info;
    info.details.pop();
    this.setData({
      info: info
    });
  },

})

这时候,能对view动态增删了,那么对数据怎么处理,给每个生成的view添加id属性,通过id属性来判断操作的是哪个Detail类。js部分代码如下:

setPlace: function (e) {
    let index = parseInt(e.currentTarget.id.replace("place-", ""));
    let place = e.detail.value;
    let info = this.data.info;
    info.details[index].placeName = place;
    this.setData({
      info: info
    });
  },

setNumber: function (e) {
    let index = parseInt(e.currentTarget.id.replace("number-", ""));
    let number = e.detail.value;
    let info = this.data.info;
    info.details[index].number = number;
    this.setData({
      info: info
    });
  },