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20+个可重复使用的jQuery代码片段

2018-06-23 22:16:16来源：未知阅读 ()

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。

图片的延迟加载

1
jQuery(document).ready(function() {

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    jQuery("img.lazy").lazy({

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        delay: 2000

4
    });

5
});

Source

预先载入图像

01
(function($) {

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  var cache = [];

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  // Arguments are image paths relative to the current page.

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  $.preLoadImages = function() {

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    var args_len = arguments.length;

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    for (var i = args_len; i--;) {

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      var cacheImage = document.createElement('img');

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      cacheImage.src = arguments[i];

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      cache.push(cacheImage);

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    }

11
  }

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})(jQuery)

Source

部分页面刷新

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setInterval(function() {

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    $("#refresh").load(location.href+" #refresh>*","");

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}, 10000);

Source

延迟动画/效果

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

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Open external link in New Window

01
$('a').each(function() {

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   var a = new RegExp('/' + window.location.host + '/');

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   if(!a.test(this.href)) {

04
       $(this).click(function(event) {

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           event.preventDefault();

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           event.stopPropagation();

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           window.open(this.href, '_blank');

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       });

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   }

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});

Source

Make Everything Mobile Friendly

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var scr = document.createElement('script');

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scr.setAttribute('src', 'https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/

03
jquery.min.js');

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document.body.appendChild(scr);

05
 
06
scr.onload = function(){

07
 
08
    $('div').attr('class', '').attr('id', '').css({

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        'margin' : 0,

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        'padding' : 0,

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        'width': '100%',

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        'clear':'both'

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    });

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};

Source

Image Resize Using jQuery

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$(window).bind("load", function() {

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    // IMAGE RESIZE

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    $('#product_cat_list img').each(function() {

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        var maxWidth = 120;

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        var maxHeight = 120;

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        var ratio = 0;

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        var width = $(this).width();

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        var height = $(this).height();

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        if(width > maxWidth){

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            ratio = maxWidth / width;

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            $(this).css("width", maxWidth);

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            $(this).css("height", height * ratio);

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            height = height * ratio;

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        }

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        var width = $(this).width();

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        var height = $(this).height();

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        if(height > maxHeight){

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            ratio = maxHeight / height;

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            $(this).css("height", maxHeight);

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            $(this).css("width", width * ratio);

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            width = width * ratio;

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        }

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    });

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    //$("#contentpage img").show();

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    // IMAGE RESIZE

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});

Source

Smooth Scrolling

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$(function() {

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  $('a[href*=#]:not([href=#])').click(function() {

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    if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')

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 && location.hostname == this.hostname) {

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      var target = $(this.hash);

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      target = target.length ? target : $('[name=' + this.hash.slice(1) +']');

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      if (target.length) {

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        $('html,body').animate({

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          scrollTop: target.offset().top

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        }, 1000);

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        return false;

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      }

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    }

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  });

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});

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Window load event with minimum delay

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(function fn() {

02
 
03
  fn.now = +new Date;

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05
  $(window).load(function() {

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     if (+new Date - fn.now < 500) setTimeout(fn, 500);

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09
         // Do something

10
 
11
  });

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})();

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jQuery Accordion

01
(function($) {

02
 
03
  var allPanels = $('.accordion > dd').hide();

04
 
05
  $('.accordion > dt > a').click(function() {

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    allPanels.slideUp();

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    $(this).parent().next().slideDown();

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    return false;

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  });

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})(jQuery);

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Simple Auto-Playing Slideshow

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$("#slideshow > div:gt(0)").hide();

02
 
03
setInterval(function() {

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  $('#slideshow > div:first')

05
    .fadeOut(1000)

06
    .next()

07
    .fadeIn(1000)

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    .end()

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    .appendTo('#slideshow');

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},  3000);

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Shuffle DOM Elements

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(function($){

02
 
03
    $.fn.shuffle = function() {

04
 
05
        var allElems = this.get(),

06
            getRandom = function(max) {

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                return Math.floor(Math.random() * max);

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            },

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            shuffled = $.map(allElems, function(){

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                var random = getRandom(allElems.length),

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                    randEl = $(allElems[random]).clone(true)[0];

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                allElems.splice(random, 1);

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                return randEl;

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           });

15
 
16
        this.each(function(i){

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            $(this).replaceWith($(shuffled[i]));

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        });

19
 
20
        return $(shuffled);

21
 
22
    };

23
 
24
})(jQuery);

Source

Scroll Page Horizontally With Mouse Wheel

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$(function() {

02
 
03
   $("body").mousewheel(function(event, delta) {

04
 
05
      this.scrollLeft -= (delta * 30);

06
 
07
      event.preventDefault();

08
 
09
   });

10
 
11
});

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Load Only a Section of a Page

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

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Highlight Related Label when Input in Focus

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$("form :input").focus(function() {

2
  $("label[for='" + this.id + "']").addClass("labelfocus");

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}).blur(function() {

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  $("label").removeClass("labelfocus");

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});

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Highlight All Links To Current Page

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$(function(){

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    $("a").each(function(){

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       if ($(this).attr("href") == window.location.pathname){

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            $(this).addClass("selected");

5
       }

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    });

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});

Source

Better Broken Image Handling

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// Replace source

2
$('img').error(function(){

3
        $(this).attr('src', 'missing.png');

4
});

5
 
6
// Or, hide them

7
$("img").error(function(){

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        $(this).hide();

9
});

Source

Load Content on Scroll Automatically

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var loading = false;

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$(window).scroll(function(){

03
    if((($(window).scrollTop()+$(window).height())+250)>=$(document).

04
height()){

05
        if(loading == false){

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            loading = true;

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            $('#loadingbar').css("display","block");

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            $.get("load.php?start="+$('#loaded_max').val(),

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function(loaded){

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                $('body').append(loaded);

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                $('#loaded_max').val(parseInt($('#loaded_max')

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.val())+50);

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                $('#loadingbar').css("display","none");

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                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') {

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      jQuery.data(this, "disabledOnSubmit", { submited: true });

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      $('input[type=submit], input[type=button]', this).each(function() {

06
        $(this).attr("disabled", "disabled");

07
      });

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      return true;

09
    }

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    else

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    {

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      return false;

13
    }

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  });

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});

Source

Make Entire Div Clickable

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$(".myBox").click(function(){

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     window.location=$(this).find("a").attr("href");

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     return false;

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});

Source

Toggle Text

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$("#more-less-options-button").click(function() {

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     var txt = $("#extra-options").is(':visible') ? 'more options': 'less

3
options';

4
     $("#more-less-options-button").text(txt);

5
     $("#extra-options").slideToggle();

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});