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
目前为
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.greasyfork.icu/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)
}, $)