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  • 20+个可重复使用的jQuery代码片段

    jQuery已经成为任何web项目的重要组成部分。它为网站提供了交互性的通过移动HTML元素，创建自定义动画，处理事件，选择DOM元素，检索整个document ，让最终用户有一个更好的体验。

    在这篇文章中我已经收集了20 +个可重复使用的jQuery代码片段，你可以很容易地复制并直接粘贴到你的项目中。

    Reusable jQuery Code Snippets for Developers

    图片的延迟加载

    1 jQuery(document).ready(function() {
    2     jQuery("img.lazy").lazy({
    3         delay: 2000
    4     });
    5 });

    Source

    预先载入图像

    01 (function($) {
    02   var cache = [];
    03   // Arguments are image paths relative to the current page.
    04   $.preLoadImages = function() {
    05     var args_len = arguments.length;
    06     for (var i = args_len; i--;) {
    07       var cacheImage = document.createElement('img');
    08       cacheImage.src = arguments[i];
    09       cache.push(cacheImage);
    10     }
    11   }
    12 })(jQuery)

    Source

    部分页面刷新

    1 setInterval(function() {
    2     $("#refresh").load(location.href+" #refresh>*","");
    3 }, 10000);

    Source

    延迟动画/效果

    1 $(".alert").delay(2000).fadeOut();

    Source

    Open external link in New Window

    01 $('a').each(function() {
    02    var a = new RegExp('/' + window.location.host + '/');
    03    if(!a.test(this.href)) {
    04        $(this).click(function(event) {
    05            event.preventDefault();
    06            event.stopPropagation();
    07            window.open(this.href, '_blank');
    08        });
    09    }
    10 });

    Source

    Make Everything Mobile Friendly

    01 var scr = document.createElement('script');
    02 scr.setAttribute('src', 'https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/
    03 jquery.min.js');
    04 document.body.appendChild(scr);
    05  
    06 scr.onload = function(){
    07  
    08     $('div').attr('class', '').attr('id', '').css({
    09         'margin' : 0,
    10         'padding' : 0,
    11         'width': '100%',
    12         'clear':'both'
    13     });
    14 };

    Source

    Image Resize Using jQuery

    01 $(window).bind("load", function() {
    02     // IMAGE RESIZE
    03     $('#product_cat_list img').each(function() {
    04         var maxWidth = 120;
    05         var maxHeight = 120;
    06         var ratio = 0;
    07         var width = $(this).width();
    08         var height = $(this).height();
    09  
    10         if(width > maxWidth){
    11             ratio = maxWidth / width;
    12             $(this).css("width", maxWidth);
    13             $(this).css("height", height * ratio);
    14             height = height * ratio;
    15         }
    16         var width = $(this).width();
    17         var height = $(this).height();
    18         if(height > maxHeight){
    19             ratio = maxHeight / height;
    20             $(this).css("height", maxHeight);
    21             $(this).css("width", width * ratio);
    22             width = width * ratio;
    23         }
    24     });
    25     //$("#contentpage img").show();
    26     // IMAGE RESIZE
    27 });

    Source

    Smooth Scrolling

    01 $(function() {
    02   $('a[href*=#]:not([href=#])').click(function() {
    03     if (location.pathname.replace(/^//,'') == this.pathname.replace(/^//,'')
    04  && location.hostname == this.hostname) {
    05       var target = $(this.hash);
    06       target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
    07       if (target.length) {
    08         $('html,body').animate({
    09           scrollTop: target.offset().top
    10         }, 1000);
    11         return false;
    12       }
    13     }
    14   });
    15 });

    Source

    Window load event with minimum delay

    01 (function fn() {
    02  
    03   fn.now = +new Date;
    04  
    05   $(window).load(function() {
    06  
    07      if (+new Date - fn.now < 500) setTimeout(fn, 500);
    08  
    09          // Do something
    10  
    11   });
    12  
    13 })();

    Source

    jQuery Accordion

    01 (function($) {
    02  
    03   var allPanels = $('.accordion > dd').hide();
    04  
    05   $('.accordion > dt > a').click(function() {
    06     allPanels.slideUp();
    07     $(this).parent().next().slideDown();
    08     return false;
    09   });
    10  
    11 })(jQuery);

    Source

    Simple Auto-Playing Slideshow

    01 $("#slideshow > div:gt(0)").hide();
    02  
    03 setInterval(function() {
    04   $('#slideshow > div:first')
    05     .fadeOut(1000)
    06     .next()
    07     .fadeIn(1000)
    08     .end()
    09     .appendTo('#slideshow');
    10 },  3000);

    Source

    Shuffle DOM Elements

    01 (function($){
    02  
    03     $.fn.shuffle = function() {
    04  
    05         var allElems = this.get(),
    06             getRandom = function(max) {
    07                 return Math.floor(Math.random() * max);
    08             },
    09             shuffled = $.map(allElems, function(){
    10                 var random = getRandom(allElems.length),
    11                     randEl = $(allElems[random]).clone(true)[0];
    12                 allElems.splice(random, 1);
    13                 return randEl;
    14            });
    15  
    16         this.each(function(i){
    17             $(this).replaceWith($(shuffled[i]));
    18         });
    19  
    20         return $(shuffled);
    21  
    22     };
    23  
    24 })(jQuery);

    Source

    Scroll Page Horizontally With Mouse Wheel

    01 $(function() {
    02  
    03    $("body").mousewheel(function(event, delta) {
    04  
    05       this.scrollLeft -= (delta * 30);
    06  
    07       event.preventDefault();
    08  
    09    });
    10  
    11 });

    Source

    Load Only a Section of a Page

    1 $("#mainNav").load("/store #mainNav")

    Source

    Highlight Related Label when Input in Focus

    1 $("form :input").focus(function() {
    2   $("label[for='" + this.id + "']").addClass("labelfocus");
    3 }).blur(function() {
    4   $("label").removeClass("labelfocus");
    5 });

    Source

    Highlight All Links To Current Page

    1 $(function(){
    2     $("a").each(function(){
    3        if ($(this).attr("href") == window.location.pathname){
    4             $(this).addClass("selected");
    5        }
    6     });
    7 });

    Source

    Better Broken Image Handling

    1 // Replace source
    2 $('img').error(function(){
    3         $(this).attr('src', 'missing.png');
    4 });
    5  
    6 // Or, hide them
    7 $("img").error(function(){
    8         $(this).hide();
    9 });

    Source

    Load Content on Scroll Automatically

    01 var loading = false;
    02 $(window).scroll(function(){
    03     if((($(window).scrollTop()+$(window).height())+250)>=$(document).
    04 height()){
    05         if(loading == false){
    06             loading = true;
    07             $('#loadingbar').css("display","block");
    08             $.get("load.php?start="+$('#loaded_max').val(),
    09 function(loaded){
    10                 $('body').append(loaded);
    11                 $('#loaded_max').val(parseInt($('#loaded_max')
    12 .val())+50);
    13                 $('#loadingbar').css("display","none");
    14                 loading = false;
    15             });
    16         }
    17     }
    18 });
    19  
    20 $(document).ready(function() {
    21     $('#loaded_max').val(50);
    22 });

    Source

    Prevent Multiple Submit of Your Form

    01 $(document).ready(function() {
    02   $('form').submit(function() {
    03     if(typeof jQuery.data(this, "disabledOnSubmit") == 'undefined') {
    04       jQuery.data(this, "disabledOnSubmit", { submited: true });
    05       $('input[type=submit], input[type=button]', this).each(function() {
    06         $(this).attr("disabled", "disabled");
    07       });
    08       return true;
    09     }
    10     else
    11     {
    12       return false;
    13     }
    14   });
    15 });

    Source

    Make Entire Div Clickable

    1 $(".myBox").click(function(){
    2      window.location=$(this).find("a").attr("href");
    3      return false;
    4 });

    Source

    Toggle Text

    1 $("#more-less-options-button").click(function() {
    2      var txt = $("#extra-options").is(':visible') ? 'more options': 'less
    3 options';
    4      $("#more-less-options-button").text(txt);
    5      $("#extra-options").slideToggle();
    6 });

    Source
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  • 原文地址：https://www.cnblogs.com/ranran/p/3663895.html
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