jQuery return positioning plug-in example tutorial
Jan 12, 2018 am 09:32 AM
本文主要介紹了jQuery返回定位插件的相關(guān)知識(shí)，具有很好的參考價(jià)值。下面跟著小編一起來(lái)看下吧，希望能幫助到大家。
一、jQuery 提供開(kāi)發(fā)者開(kāi)發(fā)插件的幾種模式
1.$.extend();???? //這個(gè)方法是綁定在$上面的。可以通過(guò)$直接調(diào)用
2.$.fn.方法名???? //這個(gè)方法是綁定在Dom對(duì)象上面的可以通過(guò)$('').方法名();調(diào)用
3.$.widget?? //通過(guò)jQuery UI 部件工廠模式創(chuàng)建。
二、插件的開(kāi)發(fā)過(guò)程
1.$.extend();
這個(gè)方法其實(shí)很簡(jiǎn)單，只是像$上面添加了一個(gè)靜態(tài)的方法而已。主要用途是對(duì)插件api的擴(kuò)展.
eg:
//$.extend();為了防止，變量和方法之間的相互污染，我們采用閉包的模式。
??(function($,factory){
????var?obj?=?factory();
????$.extend({
??????sayHelloWorld:obj.firstApply,
????})
????$.secondApply?=?obj.secondApply;
??})(jQuery,function(){
????var?obj?=?{
??????firstApply(){
????????console.log('hello?world');
??????},
??????secondApply(){
????????console.log('直接綁定到$上');
??????},
????};
?????return?obj;
??});
??$.sayHelloWorld();//hello?world
??$.secondApply();?//直接綁定到$上
???/*從上面的2種綁定方式可以看出用$.extend();對(duì)jQuery方法進(jìn)行拓展，
???其實(shí)和直接綁定到$上是一樣的效果*/
2.$.fn.方法名。?? (方法名 其實(shí)就是插件名)。
a.插件結(jié)構(gòu)
<p id="app">app</p>
//$.fn.插件名字?(logText);
??(function($,factory){
????$.fn.logText?=?factory();
??})(jQuery,function(){
????var?logText?=?function(){
??????console.log(this.text());
??????return?this;
????}
????return?logText;
??});
$("#app").logText();?//app??通過(guò)DOM元素之間調(diào)用該方法。并返回該對(duì)象。這也是jQuery實(shí)現(xiàn)鏈?zhǔn)讲僮鞯募记伞?
??var?h?=?$("#app").logText().height();?//?app
??console.log(h);?//18
?//這樣就可以自定義方法了。
在jQuery插件的開(kāi)發(fā)過(guò)程中，其實(shí)主要是通過(guò)第二種模式($.fn.插件名)開(kāi)發(fā)的。因?yàn)閖Query的強(qiáng)大之處就是對(duì)Dom的操作.
b.一個(gè)插件的強(qiáng)大之處就是參提供周全的參數(shù)。以及方便使用者對(duì)參數(shù)進(jìn)行擴(kuò)展。
<p id="app">app</p>
???//$.fn.插件名字?(myPuglin);
??(function(global,$,factory){
????var?common?=?factory();?//封裝插件使用到的函數(shù)。
????$.fn.myPuglin?=?function(opts){??//插件的名稱
??????var?defaults?=?{};?//默認(rèn)的api
??????opts?=?$.extend(defaults,opts?||?{});?//對(duì)api的拓展
??????/*
???????*
???????*?要執(zhí)行的功能
???????*?
???????*/
??????console.log(opts.hello);
??????return?this;
????}
??})(window,jQuery,function(){
????var?common?=?{
??????a(opt){
????????return?opt;
??????},
????};
????return?common;
??});
??$("#app").myPuglin({hello:'hello?world'});?//hello?world
準(zhǔn)備工作已經(jīng)完畢。那么下面會(huì)一個(gè)插件為列子，來(lái)講解
3.工作中經(jīng)常用到的列表到詳情。返回來(lái)需要保留該位置的插件。(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">第一頁(yè)?第1個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=2">第一頁(yè)?第2個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=3">第一頁(yè)?第3個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=4">第一頁(yè)?第4個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=5">第一頁(yè)?第5個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=6">第一頁(yè)?第6個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=7">第一頁(yè)?第7個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=8">第一頁(yè)?第8個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=9">第一頁(yè)?第9個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=10">第一頁(yè)?第10個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=11">第一頁(yè)?第11個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=12">第一頁(yè)?第12個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=13">第一頁(yè)?第13個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=14">第一頁(yè)?第14個(gè)li</li>
??????<li data-page="1" data-url="http://baidu.com?id=15">第一頁(yè)?第15個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=16">第二頁(yè)?第1個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=17">第二頁(yè)?第2個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=18">第二頁(yè)?第3個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=19">第二頁(yè)?第4個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=20">第二頁(yè)?第5個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=21">第二頁(yè)?第6個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=22">第二頁(yè)?第7個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=23">第二頁(yè)?第8個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=24">第二頁(yè)?第9個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=25">第二頁(yè)?第10個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=26">第二頁(yè)?第11個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=27">第二頁(yè)?第12個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=28">第二頁(yè)?第13個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=29">第二頁(yè)?第14個(gè)li</li>
??????<li data-page="2" data-url="http://baidu.com?id=30">第二頁(yè)?第15個(gè)li</li>
????</ul>
??</p>
</body>
<script type="text/javascript">
??/*
???*?1.為什么我要返回定位呢。肯定是增加用戶的體驗(yàn)度。比如你剛看的那條信息挺感
???*?興趣的，點(diǎn)進(jìn)詳情看完了，回來(lái)一看，不見(jiàn)了，是不是很嘔心啊。
???*?2.難點(diǎn)在哪里？
???*??難點(diǎn)1：當(dāng)我們有很多的列表的時(shí)候，列表肯定是滾動(dòng)加載。于是我們直接保存滾動(dòng)條的位置
???*??的方式可以放棄了。
???*??難點(diǎn)2：我們?cè)趺创_定是從詳情返回來(lái)的?
???*?3.我們?cè)撛趺磳?shí)現(xiàn)呢？
???*??其實(shí)我們實(shí)現(xiàn)的方式跟保存滾動(dòng)條的位置差不多。但要對(duì)scrollTop的距離進(jìn)行處理。
???*??a.我們點(diǎn)擊這點(diǎn)詳情的時(shí)候，可視區(qū)域列表的條數(shù)，可以是一頁(yè)的數(shù)據(jù)，可能會(huì)是2頁(yè)數(shù)據(jù)。
???*??這種情況下我們都要把結(jié)果保留下來(lái)。
???*??b.當(dāng)我們點(diǎn)擊這條數(shù)據(jù)的時(shí)候存現(xiàn)當(dāng)前頁(yè)滾動(dòng)了多少就可以了。
???*
???*??下面具體看代碼：
???*/
??(function(global,$,factory){
????var?keepScrollTop?=?0;?//用于最后保存的滾動(dòng)條的位置
????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),??//滾動(dòng)的容器
????????logo:"data-url",???//?用于計(jì)算在這個(gè)容器中的每個(gè)LI中的唯一標(biāo)識(shí)量。一般為去詳情的連接
????????currentPage:"data-page",??//點(diǎn)擊當(dāng)前的li的頁(yè)碼
????????pageResize:30,????????//與后臺(tái)交互的每頁(yè)返回的數(shù)量。?默認(rèn)是30,
????????goToDetailElement:$(".go-detail")?,??//滾動(dòng)的每個(gè)列的總對(duì)象
????????nodeLi:"",?//元素節(jié)點(diǎn)
????????getPageNum:"getPageNum",???????//1表示單頁(yè)數(shù)據(jù)，2表示雙頁(yè)數(shù)據(jù)。設(shè)置是請(qǐng)求單頁(yè)數(shù)據(jù)還是雙頁(yè)數(shù)據(jù)的標(biāo)識(shí)量。放在URL上。
????????urlPageNum:"pageNum",????????//用于放到URL上面的參數(shù)標(biāo)識(shí)表示當(dāng)前是幾頁(yè).?pageNum?=?currentPage??//返回來(lái)的時(shí)候用這個(gè)參數(shù)來(lái)判斷是不是需要滾動(dòng)
??????};
??????var?settings?=?$.extend(defaults,options?||?{});
??????dataPage?=?elements.attr(settings.currentPage);??//求出點(diǎn)擊對(duì)象位于哪一個(gè)頁(yè)碼
??????logo?=?elements.attr(settings.logo);???//求出當(dāng)前對(duì)象的唯一標(biāo)識(shí)量
??????containerHeight?=?parseInt(settings.container.outerHeight());??//容器的高度
??????scrollTopDistance?=?parseInt(settings.container.scrollTop());?//滾動(dòng)的距離
??????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);?????//當(dāng)前的頁(yè)數(shù)
????????????tool.changeUrlPar(settings.getPageNum,2);???????//獲取雙頁(yè)數(shù)據(jù)
????????????keepScrollTop?=?scrollTopDistance?-?prevCountPageDistance;??????????//請(qǐng)求雙頁(yè)數(shù)據(jù)?向上?減?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);????//點(diǎn)擊對(duì)象位于當(dāng)前的頁(yè)數(shù)
??????????????tool.changeUrlPar(settings.getPageNum,2);????????//請(qǐng)求雙頁(yè)數(shù)據(jù)
??????????????keepScrollTop?=?scrollTopDistance?-?prevPageScrollDistance;
????????????}else{
??????????????tool.changeUrlPar(settings.urlPageNum,dataPage);????//點(diǎn)擊對(duì)象位于當(dāng)前的頁(yè)數(shù)
??????????????tool.changeUrlPar(settings.getPageNum,1);??//請(qǐng)求單頁(yè)數(shù)據(jù)
??????????????keepScrollTop?=?scrollTopDistance?-?prevPageScrollDistance;
????????????};
??????????};
????????};
??????});
??????tool.setSessionStorage("keepScrollTop",keepScrollTop);???//保存滾動(dòng)條的位置
??????return?this;
????};
????$.getSessionStorage?=?function(opt){
??????opt?=?sessionStorage.getItem(opt);
??????return?opt;
????};
??})(window,jQuery,function(){
????var?tool?=?{
??????changeUrlPar(arg,?val){??//改變URL參數(shù)
????????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
?????*?點(diǎn)擊玩了以后url就變成這樣了。這時(shí)候表示?返回來(lái)的時(shí)候請(qǐng)求第二頁(yè)的數(shù)據(jù)。只請(qǐng)求一次。從第二頁(yè)開(kāi)始
?????*
?????*?2.http://localhost/index.php/Home/Web?pageNum=1&getPageNum=2
?????*?這樣表示請(qǐng)求也數(shù)據(jù)。從第一頁(yè)的數(shù)據(jù)開(kāi)始
?????*
?????*/
????var?_herf?=?$(this).attr("data-url");
????window.location.href?=?_herf;
??});
??//當(dāng)我們初始化的時(shí)候
??var?pageNum?=?1,getPageNum?=?2;?//這兩個(gè)數(shù)的值是從URL中獲取的。只有從詳情返回來(lái)?時(shí)候，才有
??if(!!pageNum?&&?!!getPageNum){
????//其中還有很多判定，肯定是先獲取數(shù)據(jù)在滾動(dòng)。。。
????$(window).scrollTop($.getSessionStorage('keepScrollTop'));
??}else{
??}
</script>
</html>
這個(gè)返回定位的插件基本就開(kāi)發(fā)完畢了。當(dāng)然對(duì)于實(shí)際的項(xiàng)目中，還有很多的改動(dòng)。比如返回的時(shí)候，一定要把設(shè)置的標(biāo)志參數(shù)去掉。
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jQuery scrollFix滾動(dòng)定位插件_javascript技巧
jQuery導(dǎo)航條固定定位效果的實(shí)現(xiàn)方法
JavaScript隨機(jī)生成一定位數(shù)的密碼的實(shí)現(xiàn)方法
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