首页 > > 程序设计 > delphi >

20+个可重复使用的jQuery代码片段

2018-06-17 20:47:32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() {

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
});