h5-cli/build/component/ScrollHooker.js

hello

"use strict";

/**
	\u4f9d\u8d56zepto.js
	\u6eda\u52a8\u52a0\u8f7d\u7ec4\u4ef6	
*/
define("component/ScrollHooker", function (require, exports, module) {

	var CouponHooker = function CouponHooker(t) {

		this.prevHeight = 0;
		//\u662f\u5426\u5728\u6fc0\u6d3b\u72b6\u6001
		this.activation = 1;
		//\u5bb9\u5668
		this.container = t || document.body;

		this.scrollElement = this.container == document.body ? window : this.container;
		//\u9884\u52a0\u8f7d\u5927\u5c0f
		this.bufferHeight = 360, this.init();
	};

	CouponHooker.prototype = {
		init: function init() {
			var t = this;
			//\u76d1\u542cscroll\u4e8b\u4ef6
			$(this.scrollElement).on("scroll", function () {
				t.scroll();
			});
		},
		scroll: function scroll() {

			var container = this.container;
			var innerHeight = container == document.body ? window.innerHeight : container.clientHeight;
			var scrollHeight = container.scrollHeight;
			var scrollTop = container.scrollTop;

			//\u7a97\u53e3\u9ad8\u5ea6\u53d1\u751f\u53d8\u5316\uff0c\u81ea\u52a8\u6fc0\u6d3b
			if (scrollHeight != this.prevHeight) {
				this.start();
			}

			//\u89e6\u53d1onEnd\u4e8b\u4ef6
			// console.log(1 == this.activation ,!this.isRecovery, scrollHeight - scrollTop - innerHeight - this.bufferHeight < 0);

			if (1 != this.activation || this.isRecovery) {
				return;
			}

			if (scrollHeight - scrollTop - innerHeight - this.bufferHeight < 0) {
				this.stop();
				this.prevHeight = scrollHeight;
				this.onEnd();
			}
		},
		stop: function stop() {
			this.activation = 0;
		},
		start: function start() {
			this.activation = 1;
		},
		recovery: function recovery() {
			this.isRecovery = 1;
		},
		onEnd: function onEnd() {}
	};

	module.exports = CouponHooker;
});