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H5基于iScroll实现下拉刷新，上拉加载更多

由 混江龙づ霸主 提交于 2020-02-12 15:46:46

 

使用技巧

      1、引用iScroll.js， 在初始化时添加两个事件监听：touchMove、DOMContentLoaded。

      2、实现iScroll插件的onScrollEnd事件， 也就是在这个事件里调用你自己的ajax方法实现数据的刷新和追加。

      3、上拉加载更多请求后台时就相当于分页请求数据，这时候需要在ajax请求时发送pageIndex参数，而初始化加载时需要从后台返回一个pageCount以便前台判断。

      4、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。

效果图

 实现方法

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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);

      1、引用iScroll.js， 在初始化时添加两个事件监听：touchMove、DOMContentLoaded。

      2、实现iScroll插件的onScrollEnd事件， 也就是在这个事件里调用你自己的ajax方法实现数据的刷新和追加。

      3、上拉加载更多请求后台时就相当于分页请求数据，这时候需要在ajax请求时发送pageIndex参数，而初始化加载时需要从后台返回一个pageCount以便前台判断。

      4、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。

效果图

 实现方法

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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);
标签
iscroll
queryselector
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