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scrollfix

JQuery辅助文本框在浏览器中固定位置，不随浏览器滚动条滚动

Tính đến 10-08-2019. Xem phiên bản mới nhất.

Script này sẽ không được không được cài đặt trực tiếp. Nó là một thư viện cho các script khác để bao gồm các chỉ thị meta // @require https://update.greasyfork.org/scripts/388372/723756/scrollfix.js 

// ==UserScript==
// @name         scrollfix
// @version      0.0.1
// @namespace    tsharp.js
// @description  JQuery辅助文本框在浏览器中固定位置，不随浏览器滚动条滚动
// @author       jimbo
// @license      GPLv3
// @match        *
// @icon         none
// @require      http://code.jquery.com/jquery-3.4.1.min.js
// ==/UserScript==
/*
 * fixedScroll.js 滚动固定插件
 * @DH   
 * https://denghao.me
 * 
 * 示例：
 * $('.box').fixedScroll()
 */
(function () {
    var fixedScroll = function ($fixedEl, opts) {
        this.defaults = {
            navEls: '', //nav (注意: navEls和hookEls两个参数必须成对出现)
            hookEls: '', //nav要滚动到的对应元素
            hookOffset: 0, //hook区域顶部偏移量
            offset: 0, //固定元素顶部偏移量
            stickEndEl: '', //固定结束位置的元素
            callback: ''
        };
        $.extend(this, this.defaults, opts);
        this.flag = true;
        this.stickTop = 0; //固定元素的原始位置
        this.init_stickTop = 0; //用于重计算高度
        this.stickBottom = 9999999; //固定元素的结束位置
        this.fixedEl = $fixedEl; //固定元素
        this.fixedElH = $fixedEl.height();
        this.fixedElW = $fixedEl.width();
        this.fixedElL = $fixedEl.offset().left;
        this.winEl = $(window);
        this.offset = parseInt(this.offset || 0);
        this.hookArea = [];
        this.isClickSwitch = false;
    }
    fixedScroll.prototype = {
        init: function () {
            if (this.fixedEl.length > 0) {
                this.stickTop = this.fixedEl.offset().top;
                this.init_stickTop = this.stickTop;
            }

            if (this.stickEndEl.length > 0) {
                this.stickBottom = this.stickEndEl.offset().top;
            }
            // 限定起始位的距顶高度
            this.distance = this.stickBottom - this.stickTop - this.fixedElH - this.offset / 2;
            this.calcArea();
            this.flag && this.events();
            this.flag = false;
        },
        // 固定
        stickHandle: function () {
            if (this.winEl.scrollTop() > this.stickTop - this.offset) {
                if (this.winEl.scrollTop() < this.stickBottom - this.fixedElH - this.offset) {
                    this.fixedEl.css({
                        "position": "fixed",
                        "top": this.offset,
                        "left": this.fixedElL,
                        "width": this.fixedElW,
                        "height": this.fixedElH,
                        "transform": "translateY(0)"
                    });
                    typeof this.callback == 'function' && this.callback(1);
                } else {
                    this.fixedEl.css({
                        "top": "auto",
                        "left": "auto",
                        "position": "static",
                        "transform": "translateY(" + this.distance + "px)"
                    });
                    typeof this.callback == 'function' && this.callback(0);
                }
            } else {
                this.fixedEl.css({
                    "top": "auto",
                    "position": "static"
                });
                typeof this.callback == 'function' && this.callback(0);
            }
        },

        // 动态计算高度
        resizeHeight: function (hasNewTop) {
            if (this.fixedEl.length > 0) {
                this.stickTop = hasNewTop ? this.fixedEl.offset().top : this.init_stickTop;
            }
            if (this.stickEndEl.length > 0) {
                this.stickBottom = this.stickEndEl.offset().top;
            }
            this.distance = this.stickBottom - this.stickTop - this.fixedElH - this.offset / 2;
            this.calcArea();
        },

        // 计算滚动区
        calcArea: function () {
            if (this.hookEls.length <= 0) return;
            var areas = [];
            this.hookEls.each(function (i, ele) {
                var start = $(this).offset().top;
                var end = start + $(this).height();
                areas.push([start, end]);
            })
            this.hookArea = areas;
        },

        // 区域判断
        hookScroll: function () {
            var t = this.winEl.scrollTop();
            for (var i in this.hookArea) {
                if ((t > this.hookArea[i][0] - this.hookOffset) && t < this.hookArea[i][1]) {
                    this.navStatus(i)
                } else {
                    this.navStatus()
                }
            }
        },

        // nav状态
        navStatus: function (i) {
            if (i || +i === 0) {
                this.navEls.eq(i).addClass('active').siblings().removeClass('active');
            } else {
                this.navEls.eq(i).removeClass('active');
            }
        },

        // 滚动到指定位置
        refresh: function (i) {
            this.calcArea();
            var top = this.hookArea[i][0] - this.hookOffset;
            this.scrollTop(top, 120);
        },

        scrollTop: function (scrollTo, time) {
            var scrollTop = document.documentElement.scrollTop || window.pageYOffset || document.body.scrollTop;
            var scrollFrom = parseInt(scrollTop),
                i = 0,
                step = 5;
            scrollTo = parseInt(scrollTo);
            time /= step;
            var interval = setInterval(function () {
                i++;
                var top = (scrollTo - scrollFrom) / time * i + scrollFrom;
                document.body.scrollTop = top;
                document.documentElement.scrollTop = top;
                if (i >= time) {
                    clearInterval(interval);
                }
            }, step)
        },

        events: function () {
            var _this = this;
            // 切换nav
            if (_this.navEls.length > 0) {
                this.navEls.on('click', function () {
                    var i = $(this).index();
                    _this.isClickSwitch = true;
                    _this.refresh(i);
                    _this.navStatus(i);
                    setTimeout(function () {
                        _this.isClickSwitch = false;
                    }, 300);
                })
            }
            // 滚动监听
            this.winEl.on("scroll", function () {
                (_this.fixedEl.length > 0) && _this.stickHandle();
                (_this.hookEls.length > 0 && !_this.isClickSwitch) && _this.hookScroll();
            });
        }
    }

    $.fn.fixedScroll = function (opts) {
        var drag = new fixedScroll(this, opts);
        drag.init();
        return drag;
    }

    //兼容模块
    if (typeof module !== 'undefined' && typeof exports === 'object') {
        module.exports = fixedScroll;
    } else if (typeof define === 'function' && (define.amd || define.cmd)) {
        define(function () {
            return fixedScroll;
        })
    } else {
        window.fixedScroll = fixedScroll;
    }
}).call(function () {
    return (typeof window !== 'undefined' ? window : global)
}, $)