微信小程序动态添加view组件的实例代码
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 }); },
总结
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