小程序首页获取数据给数组赋值，实现加载更多，以及遇到的坑
程序员文章站
2022-07-02 13:46:26
不能直接把后台返回的数组数据赋值到定义的空数组中，一定要concat连接，否则结果是看似是个数组，但是获取到的该数组却为空，导致第一次上拉加载更多的时候是拿到的之前的数组依然是空数组。 var config = require('../../config') var util = require(' ......
<!-- wxml-->
<view>
<view class="refreshTip" wx:if="{{refreshCompeleted==true}}">刷新成功</view>
<news-list-item wx:for="{{newsList}}" news="{{item}}" wx:key="item.id"></news-list-item>
<view class="weui-loadmore" wx:if="{{loading===true}}">
<view class="weui-loading"></view>
<view class="weui-loadmore__tips">加载中</view>
</view>
<view class="weui-loadmore" wx:if="{{loadingCompeleted===true}}">
<view class="weui-loadmore__tips">加载完成</view>
</view>
<view class="weui-loadmore weui-loadmore_line" wx:if="{{noData===true}}">
<view class="weui-loadmore__tips weui-loadmore__tips_in-line">暂无数据</view>
</view>
</view>
不能直接把后台返回的数组数据赋值到定义的空数组中，一定要concat连接，否则结果是看似是个数组，但是获取到的该数组却为空，导致第一次上拉加载更多的时候是拿到的之前的数组依然是空数组。
var config = require('../../config')
var util = require('../../utils/util.js')
Component({
properties: {
category: {
type: String,
value: "index"
},
params: {
type: String,
value: ""
},
},
data: {
newsList: [],
page: 0,
size: 10,
totalPages: 0,
refreshCompeleted: false,
loadingCompeleted: false,
loading: false,
noData: false
},
methods: {
getList() {
let that = this;
that.setData({
page: 0
})
if (that.data.category === "index") {
util.get(`${config.service.host}/web/news/list_with_pub_info?channelId=${config.channelId}&page=0&size=${that.data.size}`, function(res) {
res.data.content.filter((value) => {
return value.createAt = util.formatTimeDistance(new Date(value.createAt))
})
let newsList = that.data.newsList.concat(res.data.content);//这里要特别注意，不能直接that.setData({newsList:res.data.content}) ,见下面注释
that.setData({
newsList: newsList,
totalPages: res.data.totalPages,
})
if (res.data.content.length = 0) {
that.setData({
noData: true
})
}
if (res.data.content.length !== 0 && that.data.page + 1 == that.data.totalPages) {
that.setData({
loadingCompeleted: true,
loading: false,
noData: false
})
}
setTimeout(function() {
that.setData({
refreshCompeleted: true
})
}, 1000)
setTimeout(function() {
that.setData({
refreshCompeleted: false
})
}, 2000)
}, function(e) {
console.log(JSON.stringify(e));
});
} else if (that.data.category === "search") {
util.get(`${config.service.host}/web/news/search_in_channel_with_pub_info?channelId=${config.channelId}&page=${that.data.page}&size=${that.data.size}&q=${that.data.params}`, function(res) {
res.data.content.filter((value) => {
value.createAt = util.formatTimeDistance(new Date(value.createAt));
let keyword = that.data.params;
let re = new RegExp(keyword, "g");
value.title = value.title.replace(re, `<span class="keyword">${keyword}</span>`);
return value
})
let newsList = that.data.newsList.concat(res.data.content);
that.setData({
newsList: newsList,
totalPages: res.data.totalPages,
})
console.log(res.data.content.length)
if (res.data.content.length === 0) {
that.setData({
noData: true
})
}
if (res.data.content.length !== 0 && that.data.page + 1 == that.data.totalPages) {
that.setData({
loadingCompeleted: true,
loading: false,
noData: false
})
}
setTimeout(function() {
that.setData({
refreshCompeleted: true
})
}, 1000)
setTimeout(function() {
that.setData({
refreshCompeleted: false
})
}, 2000)
}, function(e) {
console.log(JSON.stringify(e));
});
} else if (that.data.category === "professor") {
util.get(`${config.service.host}/web/news/list_by_follow_with_pub_info?pubId=${that.data.params}&page=${that.data.page}&size=${that.data.size}&q=${that.data.params}`, function(res) {
res.data.content.filter((value) => {
return value.createAt = util.formatTimeDistance(new Date(value.createAt))
})
let newsList = that.data.newsList.concat(res.data.content);
that.setData({
newsList: newsList,
totalPages: res.data.totalPages,
})
if (res.data.content.length === 0) {
that.setData({
noData: true
})
}
if (res.data.content.length !== 0 && that.data.page + 1 == that.data.totalPages) {
that.setData({
loadingCompeleted: true,
loading: false,
noData: false
})
}
setTimeout(function() {
that.setData({
refreshCompeleted: true
})
}, 1000)
setTimeout(function() {
that.setData({
refreshCompeleted: false
})
}, 2000)
}, function(e) {
console.log(JSON.stringify(e));
});
}
},
getMoreList: function() {
let that = this;
setTimeout(function() {
if (that.data.page + 1 < that.data.totalPages) {
that.setData({
page: that.data.page + 1,
loading: true
})
if (that.data.category === "index") {
util.get(`${config.service.host}/web/news/list_with_pub_info?channelId=${config.channelId}&page=${that.data.page}&size=${that.data.size}`, function(res) {
res.data.content.filter((value) => {
return value.createAt = util.formatTimeDistance(new Date(value.createAt))
})
that.setData({
newsList: that.data.newsList.concat(res.data.content),
totalPages: res.data.totalPages,
loading: false
})
}, function(e) {
console.log(JSON.stringify(e));
});
} else if (that.data.category === "search") {
util.get(`${config.service.host}/web/news/search_in_channel_with_pub_info?channelId=${config.channelId}&page=${that.data.page}&size=${that.data.size}&q=${that.data.params}`, function(res) {
res.data.content.filter((value) => {
value.createAt = util.formatTimeDistance(new Date(value.createAt));
let keyword = that.data.params;
let re = new RegExp(keyword, "g");
value.title = value.title.replace(re, `<text class="keyword">${keyword}</text>`);
return value
})
that.setData({
newsList: that.data.newsList.concat(res.data.content),
totalPages: res.data.totalPages,
loading: false
})
}, function(e) {
console.log(JSON.stringify(e));
});
} else if (that.data.category === "professor") {
util.get(`${config.service.host}/web/news/list_by_follow_with_pub_info?pubId=${that.data.params}&page=${that.data.page}&size=${that.data.size}&q=${that.data.params}`, function(res) {
res.data.content.filter((value) => {
return value.createAt = util.formatTimeDistance(new Date(value.createAt))
})
that.setData({
newsList: that.data.newsList.concat(res.data.content),
totalPages: res.data.totalPages,
loading: false
})
}, function(e) {
console.log(JSON.stringify(e));
});
}
} else {
that.setData({
loading: false,
loadingCompeleted: true
})
}
}, 500)
},
},
})