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。
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
});
},