jQuery return positioning plug-in example tutorial
本文主要介绍了jQuery返回定位插件的相关知识，具有很好的参考价值。下面跟着小编一起来看下吧，希望能帮助到大家。
一、jQuery 提供开发者开发插件的几种模式
1.$.extend(); //这个方法是绑定在$上面的。可以通过$直接调用
2.$.fn.方法名 //这个方法是绑定在Dom对象上面的可以通过$('').方法名();调用
3.$.widget //通过jQuery UI 部件工厂模式创建。
二、插件的开发过程
1.$.extend();
这个方法其实很简单，只是像$上面添加了一个静态的方法而已。主要用途是对插件api的扩展.
eg:
//$.extend();为了防止，变量和方法之间的相互污染，我们采用闭包的模式。
(function($,factory){
var obj = factory();
$.extend({
sayHelloWorld:obj.firstApply,
})
$.secondApply = obj.secondApply;
})(jQuery,function(){
var obj = {
firstApply(){
console.log('hello world');
},
secondApply(){
console.log('直接绑定到$上');
},
};
return obj;
});
$.sayHelloWorld();//hello world
$.secondApply(); //直接绑定到$上
/*从上面的2种绑定方式可以看出用$.extend();对jQuery方法进行拓展，
其实和直接绑定到$上是一样的效果*/2.$.fn.方法名。 (方法名 其实就是插件名)。
a.插件结构
<p id="app">app</p>
//$.fn.插件名字 (logText);
(function($,factory){
$.fn.logText = factory();
})(jQuery,function(){
var logText = function(){
console.log(this.text());
return this;
}
return logText;
});
$("#app").logText(); //app 通过DOM元素之间调用该方法。并返回该对象。这也是jQuery实现链式操作的技巧。
var h = $("#app").logText().height(); // app
console.log(h); //18
//这样就可以自定义方法了。在jQuery插件的开发过程中，其实主要是通过第二种模式($.fn.插件名)开发的。因为jQuery的强大之处就是对Dom的操作.
b.一个插件的强大之处就是参提供周全的参数。以及方便使用者对参数进行扩展。
<p id="app">app</p>
//$.fn.插件名字 (myPuglin);
(function(global,$,factory){
var common = factory(); //封装插件使用到的函数。
$.fn.myPuglin = function(opts){ //插件的名称
var defaults = {}; //默认的api
opts = $.extend(defaults,opts || {}); //对api的拓展
/*
*
* 要执行的功能
*
*/
console.log(opts.hello);
return this;
}
})(window,jQuery,function(){
var common = {
a(opt){
return opt;
},
};
return common;
});
$("#app").myPuglin({hello:'hello world'}); //hello world准备工作已经完毕。那么下面会一个插件为列子，来讲解
3.工作中经常用到的列表到详情。返回来需要保留该位置的插件。(返回定位) savePositon(); $.fn.savePosition
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
<title>Title</title>
<style>
@media screen and (max-width: 319px) {
html {
font-size: 85.33333px; } }
@media screen and (min-width: 320px) and (max-width: 359px) {
html {
font-size: 85.33333px; } }
@media screen and (min-width: 360px) and (max-width: 374px) {
html {
font-size: 96px; } }
@media screen and (min-width: 375px) and (max-width: 383px) {
html {
font-size: 100px; } }
@media screen and (min-width: 384px) and (max-width: 399px) {
html {
font-size: 102.4px; } }
@media screen and (min-width: 400px) and (max-width: 413px) {
html {
font-size: 106.66667px; } }
@media screen and (min-width: 414px) {
html {
font-size: 110.4px; } }
/*CSS Reset*/
body,
p,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
code,
form,
fieldset,
legend,
input,
textarea,
p,
blockquote,
th,
td,
header,
hgroup,
nav,
section,
article,
aside,
footer,
figure,
figcaption,
menu,
button {
margin: 0;
padding: 0; }
li{
list-style: none;
}
#app{
width: 100%;
max-width: 640px;
}
li {
height: 1.2rem;
width: 100%;
border-bottom: 1px solid #cccccc;
text-align: center;
line-height: 1.2rem;
font-size: 20px;
}
</style>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
</head>
<body>
<p id="app">
<ul>
<li data-page="1" data-url="http://baidu.com?id=1">第一页 第1个li</li>
<li data-page="1" data-url="http://baidu.com?id=2">第一页 第2个li</li>
<li data-page="1" data-url="http://baidu.com?id=3">第一页 第3个li</li>
<li data-page="1" data-url="http://baidu.com?id=4">第一页 第4个li</li>
<li data-page="1" data-url="http://baidu.com?id=5">第一页 第5个li</li>
<li data-page="1" data-url="http://baidu.com?id=6">第一页 第6个li</li>
<li data-page="1" data-url="http://baidu.com?id=7">第一页 第7个li</li>
<li data-page="1" data-url="http://baidu.com?id=8">第一页 第8个li</li>
<li data-page="1" data-url="http://baidu.com?id=9">第一页 第9个li</li>
<li data-page="1" data-url="http://baidu.com?id=10">第一页 第10个li</li>
<li data-page="1" data-url="http://baidu.com?id=11">第一页 第11个li</li>
<li data-page="1" data-url="http://baidu.com?id=12">第一页 第12个li</li>
<li data-page="1" data-url="http://baidu.com?id=13">第一页 第13个li</li>
<li data-page="1" data-url="http://baidu.com?id=14">第一页 第14个li</li>
<li data-page="1" data-url="http://baidu.com?id=15">第一页 第15个li</li>
<li data-page="2" data-url="http://baidu.com?id=16">第二页 第1个li</li>
<li data-page="2" data-url="http://baidu.com?id=17">第二页 第2个li</li>
<li data-page="2" data-url="http://baidu.com?id=18">第二页 第3个li</li>
<li data-page="2" data-url="http://baidu.com?id=19">第二页 第4个li</li>
<li data-page="2" data-url="http://baidu.com?id=20">第二页 第5个li</li>
<li data-page="2" data-url="http://baidu.com?id=21">第二页 第6个li</li>
<li data-page="2" data-url="http://baidu.com?id=22">第二页 第7个li</li>
<li data-page="2" data-url="http://baidu.com?id=23">第二页 第8个li</li>
<li data-page="2" data-url="http://baidu.com?id=24">第二页 第9个li</li>
<li data-page="2" data-url="http://baidu.com?id=25">第二页 第10个li</li>
<li data-page="2" data-url="http://baidu.com?id=26">第二页 第11个li</li>
<li data-page="2" data-url="http://baidu.com?id=27">第二页 第12个li</li>
<li data-page="2" data-url="http://baidu.com?id=28">第二页 第13个li</li>
<li data-page="2" data-url="http://baidu.com?id=29">第二页 第14个li</li>
<li data-page="2" data-url="http://baidu.com?id=30">第二页 第15个li</li>
</ul>
</p>
</body>
<script type="text/javascript">
/*
* 1.为什么我要返回定位呢。肯定是增加用户的体验度。比如你刚看的那条信息挺感
* 兴趣的，点进详情看完了，回来一看，不见了，是不是很呕心啊。
* 2.难点在哪里？
* 难点1：当我们有很多的列表的时候，列表肯定是滚动加载。于是我们直接保存滚动条的位置
* 的方式可以放弃了。
* 难点2：我们怎么确定是从详情返回来的?
* 3.我们该怎么实现呢？
* 其实我们实现的方式跟保存滚动条的位置差不多。但要对scrollTop的距离进行处理。
* a.我们点击这点详情的时候，可视区域列表的条数，可以是一页的数据，可能会是2页数据。
* 这种情况下我们都要把结果保留下来。
* b.当我们点击这条数据的时候存现当前页滚动了多少就可以了。
*
* 下面具体看代码：
*/
(function(global,$,factory){
var keepScrollTop = 0; //用于最后保存的滚动条的位置
var tool =factory();
$.fn.savePosition = function(options){
var dataPage,logo,objLogo,prevNum,containerHeight = 0,scrollTopDistance = 0,elIndex = 0,
prevHeight = 0,prevCountPage = 0,prevCountPageDistance = 0,prevDistance = 0,
prevPageScrollDistance = 0;
var elements = this;
var defaults = {
container:$(window), //滚动的容器
logo:"data-url", // 用于计算在这个容器中的每个LI中的唯一标识量。一般为去详情的连接
currentPage:"data-page", //点击当前的li的页码
pageResize:30, //与后台交互的每页返回的数量。 默认是30,
goToDetailElement:$(".go-detail") , //滚动的每个列的总对象
nodeLi:"", //元素节点
getPageNum:"getPageNum", //1表示单页数据，2表示双页数据。设置是请求单页数据还是双页数据的标识量。放在URL上。
urlPageNum:"pageNum", //用于放到URL上面的参数标识表示当前是几页. pageNum = currentPage //返回来的时候用这个参数来判断是不是需要滚动
};
var settings = $.extend(defaults,options || {});
dataPage = elements.attr(settings.currentPage); //求出点击对象位于哪一个页码
logo = elements.attr(settings.logo); //求出当前对象的唯一标识量
containerHeight = parseInt(settings.container.outerHeight()); //容器的高度
scrollTopDistance = parseInt(settings.container.scrollTop()); //滚动的距离
elements.parent().find(""+ settings.nodeLi + "["+settings.currentPage + "=" + dataPage +"]").each(function(index, obj){
objLogo = $(obj).attr(settings.logo);
elIndex = index;
if(logo == objLogo){
prevNum = elements.prevAll().length;
prevHeight = tool.getDistance(elements.parent().children(),prevNum - elIndex);
prevCountPage = parseInt(prevNum / settings.pageResize);
if(scrollTopDistance < prevHeight){
elements.parent().children().each(function(index,target){
if(prevCountPage > 0 ){
if(index < (prevCountPage - 1) * settings.pageResize){
prevCountPageDistance += parseInt($(target).outerHeight());
};
};
});
tool.changeUrlPar(settings.urlPageNum,dataPage - 1); //当前的页数
tool.changeUrlPar(settings.getPageNum,2); //获取双页数据
keepScrollTop = scrollTopDistance - prevCountPageDistance; //请求双页数据 向上 减 1;
}else{
prevDistance = tool.getDistance(elements.parent().children(),(prevCountPage + 1) * settings.pageResize);
prevPageScrollDistance = tool.getDistance(elements.parent().children(),prevCountPage * settings.pageResize);
if(prevDistance < (scrollTopDistance + containerHeight)){
tool.changeUrlPar(settings.urlPageNum,dataPage); //点击对象位于当前的页数
tool.changeUrlPar(settings.getPageNum,2); //请求双页数据
keepScrollTop = scrollTopDistance - prevPageScrollDistance;
}else{
tool.changeUrlPar(settings.urlPageNum,dataPage); //点击对象位于当前的页数
tool.changeUrlPar(settings.getPageNum,1); //请求单页数据
keepScrollTop = scrollTopDistance - prevPageScrollDistance;
};
};
};
});
tool.setSessionStorage("keepScrollTop",keepScrollTop); //保存滚动条的位置
return this;
};
$.getSessionStorage = function(opt){
opt = sessionStorage.getItem(opt);
return opt;
};
})(window,jQuery,function(){
var tool = {
changeUrlPar(arg, val){ //改变URL参数
function changeU(destiny, par, par_value) {
var pattern = par+'=([^&]*)';
var replaceText = par+'='+par_value;
if (destiny.match(pattern))
{
var tmp = '/\\'+par+'=[^&]*/';
tmp = destiny.replace(eval(tmp), replaceText);
return (tmp);
}
else {
if (destiny.match('[\?]'))
{
return destiny+'&'+ replaceText;
}
else
{
return destiny+'?'+replaceText;
}
}
return destiny+'\n'+par+'\n'+par_value;
}
var hash = window.location.hash;
history.replaceState(null,'',location.pathname+location.search);
url = window.location.href;
var newUrl = changeU(url,arg,val) + hash;
history.replaceState(null,'',newUrl);
return false;
},
removeUrlPar(options){
history.replaceState(null,'',location.pathname+location.search);
var newParamStr = "";
var quotes = window.location.href.indexOf("?");
if(quotes != -1){
var webUrl = window.location.href.split("?")[0];
var paramsStr = window.location.href.split("?")[1].toString();
if(paramsStr.indexOf("&") != -1){
var pageIndex = paramsStr.indexOf(options);
if(pageIndex != -1){
var pageArr = paramsStr.split("&");
for(var i = 0; i < pageArr.length; i++){
if(pageArr[i].match(options)){
pageArr.splice(i,1);
};
};
newParamStr = pageArr.join("&");
}else{
newParamStr = paramsStr;
} ;
}else{
if(paramsStr.match(options)){
newParamStr = "";
}else {
newParamStr = paramsStr;
};
};
history.replaceState(null,'',webUrl + "?" + newParamStr);
}else{
history.replaceState(null,'',w.location.href);
}
},
getDistance(obj,maxNum){
var h = 0;
obj.each(function(index,target){
if(index < maxNum){
h += parseInt($(target).outerHeight());
}
});
return h;
},
setSessionStorage(keyName,opt){
sessionStorage.setItem(keyName,opt);
console.log(opt)
},
}
return tool;
})
$("li").on("click",function(){
$(this).savePosition({pageResize:15});
/*
* 1.http://localhost/index.php/Home/Web?pageNum=2&getPageNum=1
* 点击玩了以后url就变成这样了。这时候表示 返回来的时候请求第二页的数据。只请求一次。从第二页开始
*
* 2.http://localhost/index.php/Home/Web?pageNum=1&getPageNum=2
* 这样表示请求也数据。从第一页的数据开始
*
*/
var _herf = $(this).attr("data-url");
window.location.href = _herf;
});
//当我们初始化的时候
var pageNum = 1,getPageNum = 2; //这两个数的值是从URL中获取的。只有从详情返回来 时候，才有
if(!!pageNum && !!getPageNum){
//其中还有很多判定，肯定是先获取数据在滚动。。。
$(window).scrollTop($.getSessionStorage('keepScrollTop'));
}else{
}
</script>
</html>这个返回定位的插件基本就开发完毕了。当然对于实际的项目中，还有很多的改动。比如返回的时候，一定要把设置的标志参数去掉。
相关推荐：
jQuery scrollFix滚动定位插件_javascript技巧
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