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picker.js
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(function () {
if (!Date.now) {
Date.now = function () {
return new Date().getTime();
};
}
var vendors = ['webkit', 'moz', 'ms'];
for (var i = 0, len = vendors.length;i < len;i++) {
if (!window.requestAnimationFrame) {
var vp = vendors[i];
window.requestAnimationFrame = window[vp + 'RequestAnimationFrame'];
}
}
})();
(function () {
var isiOS = !!navigator.userAgent.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);
function on (el, evt, callback) {
el.addEventListener(evt, callback, false);
}
function off (el, evt, callback) {
el.removeEventListener(evt, callback, false);
}
function qs (id) {
return document.querySelector(id);
}
function qsa (id) {
return document.querySelectorAll(id);
}
function getIndex (val, array) {
var res = 0;
for (var i = 0, len = array.length;i < len;i++) {
if (array[i].value === val) {
res = i;
}
}
return res;
}
// 填充0
// function fillZero (number) {
// return number < 10 ? '0' + number : number;
// }
// // 限制最大输入
// function setRotateXMax (n) {
// return n > 180 ? 180 : n < -180 ? -180 : n;
// }
// 遍历数据
// function eachData (begin, end, ex) {
// var res = [];
// for (; begin <= end;begin++) {
// res.push({
// title: fillZero(+begin) + (ex || ''),
// value: fillZero(+begin)
// });
// }
// return res;
// }
var Picker = function (config) {
if (!config || typeof (config) !== 'object') {
console.error('配置文件有误');
return;
}
this.el = typeof (config.el) === 'string' ? qs(config.el) : config.el;
this.evt = config.evt || 'click';
this.data = config.data;
this.default = config.default || null;
this.autoHide = config.autoHide;
this._height = config.itemHeight || 36;
this.beforeInit = config.beforeInit || function () {};
this.onInit = config.onInit || function () {};
this.onChange = config.onChange || function() {};
this.onChangeEnd = config.onChangeEnd || function () {};
this.onConfirm = config.onConfirm || function () {};
this.className = config.className || '';
this._aniId = 0;
this._selected = [];
// 绑定事件
// on(this.el, this.evt, this._renderPop.bind(this));
this._renderPop.bind(this);
};
Picker.prototype = {
// 渲染列表数据
_renderCol: function () {
var group = '';
for (var i = 0, len = this.data.length;i < len;i++) {
var item = '';
for (var j = 0, len2 = this.data[i].length;j < len2;j++) {
item += '<div class="picker-item">' + this.data[i][j].title + '</div>';
}
group += '<div class="picker-items-col"><div class="picker-items-col-wrapper">' + item + '</div></div>';
}
return group;
},
// 渲染弹出层
_renderPop: function () {
var cols = this._renderCol(this.data);
if (cols && !qs('#cover') && !qs('#picker')) {
this.cover = document.createElement('div');
this.cover.id = 'cover';
this.picker = document.createElement('div');
this.picker.id = 'picker';
this.picker.className = this.className;
this.picker.innerHTML = '<div class="picker-header"><span class="cancel">取消</span><span class="confirm">确定</span></div><div class="picker-items">' + cols + '<div class="picker-line picker-line-top"></div><div class="picker-line picker-line-bottom"></div></div>';
document.body.appendChild(this.cover);
document.body.appendChild(this.picker);
var self = this;
setTimeout(function () {
self.cover.classList.add('show');
self.picker.classList.add('show');
}, 20);
this._event();
// 回显数据
for (var i = 0;i < this.data.length;i++) {
var offsetNum = 0;
if (this.default && typeof (this.default) === 'object' && this.default[i]) {
var _index = getIndex(this.default[i], this.data[i]);
offsetNum = _index * this._height;
this.onInit({
title: this.data[i][_index].title,
value: this.data[i][_index].value,
index: i
});
this._selected[i] = {
title: this.data[i][_index].title,
value: this.data[i][_index].value,
index: i
};
} else {
this.onInit({
title: this.data[i][0].title,
value: this.data[i][0].value,
index: i
});
this._selected[i] = {
title: this.data[i][0].title,
value: this.data[i][0].value,
index: i
};
}
var el = qsa('.picker-items-col')[i];
this._setOffset(el, i, offsetNum);
this._listener(el, i, offsetNum);
}
}
},
//
_event: function () {
var self = this;
self.cover.onclick = function () {
self.remove();
};
self.picker.querySelector('.cancel').onclick = function () {
self.remove();
};
self.picker.querySelector('.confirm').onclick = function () {
self.onConfirm(self._selected);
self.remove();
};
},
// 设置偏移
_setOffset: function (el, index, n, isTouchEnd) {
var time = isTouchEnd ? '.5s' : '0s';
if (isiOS) {
el.querySelector('.picker-items-col-wrapper').style.cssText = '-webkit-transition:' + time + '; transition:' + time + '; -webkit-transform: translateY(' + (this._height * 6 / 2 - this._height / 2 - n) + 'px); transform: translateY(' + (this._height * 6 / 2 - this._height / 2 - n) + 'px)';
} else {
el.querySelector('.picker-items-col-wrapper').style.cssText = '-webkit-transition:' + time + '; transition:' + time + '; -webkit-transform: translate3d(0, ' + (this._height * 6 / 2 - this._height / 2 - n) + 'px, 0); transform: translate3d(0, ' + (this._height * 6 / 2 - this._height / 2 - n) + 'px, 0)';
}
for (var i = 0, len = this.data[index].length;i < len;i++) {
if (-i * this._height + n > -9 && -i * this._height + n <= 9) {
var res = {
title: this.data[index][i].title,
value: this.data[index][i].value,
index: index
};
this.onChange(res);
if (isTouchEnd) {
this.onChangeEnd(res);
this._selected[index] = res;
}
}
}
},
// 事件监听
_listener: function (el, index, offsetNum) {
var self = this;
var touchStartY = 0, touchMovedY = offsetNum, thisIndex = 0;
var lastMoveTime = 0, lastMoveStart = 0, stopInertiaMove = false;
function touchstartHandler (e) {
touchStartY = e.touches[0].pageY;
thisIndex = index;
// 惯性
lastMoveStart = touchStartY;
lastMoveTime = Date.now();
stopInertiaMove = true;
}
function touchmoveHandler (e) {
e.preventDefault();
var touchMoveY = e.touches[0].pageY,
_touchMovedY = touchStartY - touchMoveY + touchMovedY;
if (_touchMovedY < -this._height) {
_touchMovedY = -this._height;
}
if (_touchMovedY > self.data[thisIndex].length * this._height) {
_touchMovedY = self.data[thisIndex].length * this._height;
}
self._setOffset(this, thisIndex, _touchMovedY);
// 惯性
var nowTime = Date.now();
stopInertiaMove = true;
if (nowTime - lastMoveTime > 300) {
lastMoveTime = nowTime;
lastMoveStart = touchMoveY;
}
}
function touchendtHandler (e) {
var toucheEndY = e.changedTouches[0].pageY;
var touchChangedY = touchStartY - toucheEndY + touchMovedY;
var _this = this;
touchMovedY = touchChangedY % self._height > self._height / 2 ? Math.ceil(touchChangedY / self._height) * self._height : Math.floor(touchChangedY / self._height) * self._height;
if (touchMovedY < 0) {
touchMovedY = 0;
self._setOffset(_this, thisIndex, touchMovedY, true);
return;
}
if (touchMovedY > self.data[thisIndex].length * self._height - self._height) {
touchMovedY = self.data[thisIndex].length * self._height - self._height;
self._setOffset(_this, thisIndex, touchMovedY, true);
return;
}
// 惯性
var nowTime = Date.now();
var v = (toucheEndY - lastMoveStart) / (nowTime - lastMoveTime); // 滑动平均速度
stopInertiaMove = false;
var dir = v > 0 ? -1 : 1;
var deceleration = dir * 0.01;
var duration = v / deceleration;
var dist = v * duration / 2;
function inertiaMove () {
if (stopInertiaMove) {
return;
}
if (Math.abs(dist) < 0.5) {
touchMovedY = touchMovedY % self._height > self._height / 2 ? Math.ceil(touchMovedY / self._height) * self._height : Math.floor(touchMovedY / self._height) * self._height;
self._setOffset(_this, thisIndex, touchMovedY, true);
return;
}
self._setOffset(_this, thisIndex, touchMovedY + dist);
dist /= 1.1;
touchMovedY += dist;
if (touchMovedY < 0) {
touchMovedY = 0;
}
if (touchMovedY > self.data[thisIndex].length * self._height - self._height) {
touchMovedY = self.data[thisIndex].length * self._height - self._height;
}
self._aniId = window.requestAnimationFrame(inertiaMove);
}
inertiaMove();
}
off(el, 'touchstart', touchstartHandler);
off(el, 'touchmove', touchmoveHandler);
off(el, 'touchend', touchendtHandler);
on(el, 'touchstart', touchstartHandler);
on(el, 'touchmove', touchmoveHandler);
on(el, 'touchend', touchendtHandler);
},
_renderItem: function (config) {
var _item = '';
this.data[config.index] = config.data;
for (var i = 0, len = config.data.length;i < len;i++) {
_item += '<div class="picker-item">' + config.data[i].title + '</div>';
}
var el = qsa('.picker-items-col')[config.index];
el.innerHTML = '<div class="picker-items-col-wrapper">' + _item + '</div>';
this._setOffset(el, config.index, getIndex(config.default, config.data) * this._height || 0, true);
this._listener(el, config.index, getIndex(config.default, config.data) * this._height || 0, true);
},
setItem: function (config) {
if (typeof (config) !== 'object') {
console.error('setItem参数有误');
return;
}
this._renderItem(config);
},
open: function () {
this._renderPop();
},
remove: function () {
var self = this;
self.cover.classList.remove('show');
self.picker.classList.remove('show');
self.picker.addEventListener('transitionend', function () {
if (!self.picker) {
return;
}
self.cover.parentNode.removeChild(self.cover);
self.picker.parentNode.removeChild(self.picker);
self.picker = null;
});
}
};
window.Picker = Picker;
})();