详解微信小程序开发之下拉刷新 上拉加载

详解微信小程序开发之下拉刷新 上拉加载

微信小程序中的下拉刷新,上拉加载的功能很常见,目前我知道的有两种可行的方法,一是scroll-view,二是整个页面刷新.今天说说第一种,自己造轮子,难免有些瑕疵,日后慢慢完善.

1.下拉刷新,在滑动到顶部时,bindscrolltoupper被调用,根据自己的业务逻辑请求即可.我的demo只是随机换了个关键字.

上代码:

1.index.js

//index.js

//获取应用实例

var app = getApp()

Page({

data: {

words: [],

windowHeight: 0,//获取屏幕高度

refreshHeight: 0,//获取高度

refreshing: false,//是否在刷新中

refreshAnimation: {}, //加载更多旋转动画数据

clientY: 0,//触摸时Y轴坐标

},

onLoad: function () {

var _this = this;

//获取屏幕高度

wxgetSystemInfo({

success: function (res) {

_thissetData({

windowHeight: reswindowHeight

})

consolelog("屏幕高度: " + reswindowHeight)

}

})

//获取words

wxrequest({

url: 'http://apiavatardatacn/ChengYu/Search?key=77f072d28eb141c8b6dda145ca364b92&keyWord=好',

complete: function (res) {

if (resdatareason == 'Succes') {

_thissetData({

words: resdataresult

})

}

}

})

},

scroll: function () {

consolelog("滑动了")

},

lower: function () {

var start = 0;

start += 1;

consolelog("加载了")

var _this = this;

wxrequest({

url: 'http://apiavatardatacn/ChengYu/Search',

data: {

key: '77f072d28eb141c8b6dda145ca364b92', keyWord: '好', page: start

},

complete: function (res) {

if (resdatareason == 'Succes') {

var words = _thisdatawordsconcat(resdataresult);

_thissetData({

words: words

})

}

}

})

},

upper: function () {

consolelog("下拉了")

//获取用户Y轴下拉的位移

if (thisdatarefreshing) return;

thissetData({ refreshing: true });

updateRefreshIconcall(this);

var _this = this;

var i = Mathrandom() //获得0-1的随机数

i = Mathceil(i * 10) //乘以XWiwllqpMX10并向上去整

var words = ['龙', '一', '万', '千', '浩', '金', '得', '而', '可', '人'];

var word = words[i];

wxrequest({

url: 'http://apiavatardatacn/ChengYu/Search?key=77f072d28eb141c8b6dda145ca364b92&keyWord=' + word,

complete: function (res) {

if (resdatareason == 'Succes') {

setTimeout(function () {

_thissetData({

words: resdataresult

})

}, 2000)

}

setTimeout(function () {

_thissetData({

refreshing: false

})

}, 2500)

}

})

},

start: function (e) {

var startPoint = etouches[0]

var clientY = startPointclientY;

thissetData({

clientY: clientY,

refreshHeight: 0

})

},

end: function (e) {

var endPoint = echangedTouches[0]

var y = (endPointclientY - thisdataclientY) * 6;

if (y > 50) {

y = 50;

}

thissetData({

refreshHeight: y

})

},

move: function (e) {

consolelog("下拉滑动了")

}

})

/**

* 旋转上拉加载图标

*/

function updateRefreshIcon() {

var deg = 0;

var _this = this;

consolelog('旋转开始了')

var animation = wxcreateAnimation({

duration: 1000

XWiwllqpMX });

var timer = setInterval(function () {

if (!_thisdatarefreshing)

clearInterval(timer);

animationrotateZ(deg)step();//在Z轴旋转一个deg角度

deg += 360;

_thissetData({

refreshAnimation: animationexport()

})

}, 1000);

}

2.index.wxml

catchtouchmove="move" catchtouchstart="start" catchtouchend="end"

>

{{itemname}}

catchtouchmove="move" catchtouchstart="start" catchtouchend="end"

>

{{itemname}}

3.index.wxss

/**indexwxss**/

item-style{

padding: 30rpx;

font-size: 40rpx;

text-align: center;

border-top: 2rpx solid #eee;

}

refresh-block {

padding: 15px;

text-align: center

}

refresh-block image {

width: 30px;

height: 30px;

}

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