使用技巧javascript
一、引用iScroll.js, 在初始化时添加两个事件监听:touchMove、DOMContentLoaded。java
二、实现iScroll插件的onScrollEnd事件, 也就是在这个事件里调用你本身的ajax方法实现数据的刷新和追加。ajax
三、上拉加载更多请求后台时就至关于分页请求数据,这时候须要在ajax请求时发送pageIndex参数,而初始化加载时须要从后台返回一个pageCount以便前台判断。app
四、最关键的就是实现下拉刷新方法(pullDownAction)和上拉加载更多(pullUpAction)方法。post
效果图this
实现方法spa
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var
myScroll,
pullDownEl, pullDownOffset,
pullUpEl, pullUpOffset,
generatedCount = 0;
/**
* 下拉刷新 (自定义实现此方法)
* myScroll.refresh(); 数据加载完成后,调用界面更新方法
*/
function
pullDownAction () {
setTimeout(
function
() {
var
el, li, i;
el = document.getElementById(
'thelist'
);
for
(i=0; i<3; i++) {
li = document.createElement(
'li'
);
li.innerText =
'Generated row '
+ (++generatedCount);
el.insertBefore(li, el.childNodes[0]);
}
myScroll.refresh();
//数据加载完成后,调用界面更新方法
}, 1000);
}
/**
* 滚动翻页 (自定义实现此方法)
* myScroll.refresh(); // 数据加载完成后,调用界面更新方法
*/
function
pullUpAction () {
setTimeout(
function
() {
// <-- Simulate network congestion, remove setTimeout from production!
var
el, li, i;
el = document.getElementById(
'thelist'
);
for
(i=0; i<3; i++) {
li = document.createElement(
'li'
);
li.innerText =
'Generated row '
+ (++generatedCount);
el.appendChild(li, el.childNodes[0]);
}
myScroll.refresh();
//数据加载完成后,调用界面更新方法
}, 1000);
}
/**
* 初始化iScroll控件
*/
function
loaded() {
pullDownEl = document.getElementById(
'pullDown'
);
pullDownOffset = pullDownEl.offsetHeight;
pullUpEl = document.getElementById(
'pullUp'
);
pullUpOffset = pullUpEl.offsetHeight;
myScroll =
new
iScroll(
'wrapper'
, {
scrollbarClass:
'myScrollbar'
,
useTransition:
false
,
topOffset: pullDownOffset,
onRefresh:
function
() {
if
(pullDownEl.className.match(
'loading'
)) {
pullDownEl.className =
''
;
pullDownEl.querySelector(
'.pullDownLabel'
).innerHTML =
'下拉刷新...'
;
}
else
if
(pullUpEl.className.match(
'loading'
)) {
pullUpEl.className =
''
;
pullUpEl.querySelector(
'.pullUpLabel'
).innerHTML =
'上拉加载更多...'
;
}
},
onScrollMove:
function
() {
if
(
this
.y > 5 && !pullDownEl.className.match(
'flip'
)) {
pullDownEl.className =
'flip'
;
pullDownEl.querySelector(
'.pullDownLabel'
).innerHTML =
'松手开始更新...'
;
this
.minScrollY = 0;
}
else
if
(
this
.y < 5 && pullDownEl.className.match(
'flip'
)) {
pullDownEl.className =
''
;
pullDownEl.querySelector(
'.pullDownLabel'
).innerHTML =
'下拉刷新...'
;
this
.minScrollY = -pullDownOffset;
}
else
if
(
this
.y < (
this
.maxScrollY - 5) && !pullUpEl.className.match(
'flip'
)) {
pullUpEl.className =
'flip'
;
pullUpEl.querySelector(
'.pullUpLabel'
).innerHTML =
'松手开始更新...'
;
this
.maxScrollY =
this
.maxScrollY;
}
else
if
(
this
.y > (
this
.maxScrollY + 5) && pullUpEl.className.match(
'flip'
)) {
pullUpEl.className =
''
;
pullUpEl.querySelector(
'.pullUpLabel'
).innerHTML =
'上拉加载更多...'
;
this
.maxScrollY = pullUpOffset;
}
},
onScrollEnd:
function
() {
if
(pullDownEl.className.match(
'flip'
)) {
pullDownEl.className =
'loading'
;
pullDownEl.querySelector(
'.pullDownLabel'
).innerHTML =
'加载中...'
;
pullDownAction();
// ajax call
}
else
if
(pullUpEl.className.match(
'flip'
)) {
pullUpEl.className =
'loading'
;
pullUpEl.querySelector(
'.pullUpLabel'
).innerHTML =
'加载中...'
;
pullUpAction();
// ajax call
}
}
});
setTimeout(
function
() { document.getElementById(
'wrapper'
).style.left =
'0'
; }, 800);
}
//初始化绑定iScroll控件
document.addEventListener(
'touchmove'
,
function
(e) { e.preventDefault(); },
false
);
document.addEventListener(
'DOMContentLoaded'
, loaded,
false
);
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