20+个可重复使用的jQuery代码片段

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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

jQuery(document).ready(function() {
jQuery("img.lazy").lazy({
delay: 2000
});
});

Source

预先载入图像

(function($) {
var cache = [];
// Arguments are image paths relative to the current page.
$.preLoadImages = function() {
var args_len = arguments.length;
for (var i = args_len; i--;) {
var cacheImage = document.createElement('img');
cacheImage.src = arguments[i];
cache.push(cacheImage);
}
}
})(jQuery)

Source

部分页面刷新

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

Source

延迟动画/效果

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

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Open external link in New Window

$('a').each(function() {
var a = new RegExp('/' + window.location.host + '/');
if(!a.test(this.href)) {
$(this).click(function(event) {
event.preventDefault();
event.stopPropagation();
window.open(this.href, '_blank');
});
}
});

Source

Make Everything Mobile Friendly

var scr = document.createElement('script');
scr.setAttribute('src', 'https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/
jquery.min.js');
document.body.appendChild(scr);
scr.onload = function(){
$('div').attr('class', '').attr('id', '').css({
'margin' : 0,
'padding' : 0,
'width': '100%',
'clear':'both'
	});
};

Source

Image Resize Using jQuery

$(window).bind("load", function() {
	// IMAGE RESIZE
	$('#product_cat_list img').each(function() {
var maxWidth = 120;
var maxHeight = 120;
var ratio = 0;
var width = $(this).width();
var height = $(this).height();
if(width > maxWidth){
ratio = maxWidth / width;
$(this).css("width", maxWidth);
$(this).css("height", height * ratio);
height = height * ratio;
}
var width = $(this).width();
var height = $(this).height();
if(height > maxHeight){
ratio = maxHeight / height;
$(this).css("height", maxHeight);
$(this).css("width", width * ratio);
width = width * ratio;
}
	});
	//$("#contentpage img").show();
	// IMAGE RESIZE
});

Source

Smooth Scrolling

$(function() {
$('a[href*=#]:not([href=#])').click(function() {
if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')
 && location.hostname == this.hostname) {
var target = $(this.hash);
target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
if (target.length) {
$('html,body').animate({
scrollTop: target.offset().top
}, 1000);
return false;
}
}
});
});

Source

Window load event with minimum delay

(function fn() {
fn.now = +new Date;
$(window).load(function() {
if (+new Date - fn.now < 500) setTimeout(fn, 500);
// Do something
});
})();

Source

jQuery Accordion

(function($) {
var allPanels = $('.accordion > dd').hide();
$('.accordion > dt > a').click(function() {
allPanels.slideUp();
$(this).parent().next().slideDown();
return false;
});
})(jQuery);

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Simple Auto-Playing Slideshow

$("#slideshow > div:gt(0)").hide();
setInterval(function() {
$('#slideshow > div:first')
.fadeOut(1000)
.next()
.fadeIn(1000)
.end()
.appendTo('#slideshow');
},  3000);

Source

Shuffle DOM Elements

(function($){
$.fn.shuffle = function() {
var allElems = this.get(),
getRandom = function(max) {
return Math.floor(Math.random() * max);
},
shuffled = $.map(allElems, function(){
var random = getRandom(allElems.length),
randEl = $(allElems[random]).clone(true)[0];
allElems.splice(random, 1);
return randEl;
});
this.each(function(i){
$(this).replaceWith($(shuffled[i]));
});
return $(shuffled);
};
})(jQuery);

Source

Scroll Page Horizontally With Mouse Wheel

$(function() {
$("body").mousewheel(function(event, delta) {
this.scrollLeft -= (delta * 30);
event.preventDefault();
});
});

Source

Load Only a Section of a Page

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

Source

Highlight Related Label when Input in Focus

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

Source

Highlight All Links To Current Page

$(function(){
	$("a").each(function(){
if ($(this).attr("href") == window.location.pathname){
$(this).addClass("selected");
}
	});
});

Source

Better Broken Image Handling

// Replace source
$('img').error(function(){
$(this).attr('src', 'missing.png');
});
// Or, hide them
$("img").error(function(){
$(this).hide();
});

Source

Load Content on Scroll Automatically

var loading = false;
$(window).scroll(function(){
	if((($(window).scrollTop()+$(window).height())+250)>=$(document).
height()){
if(loading == false){
loading = true;
$('#loadingbar').css("display","block");
$.get("load.php?start="+$('#loaded_max').val(), 
function(loaded){
$('body').append(loaded);
$('#loaded_max').val(parseInt($('#loaded_max')
.val())+50);
$('#loadingbar').css("display","none");
loading = false;
});
}
	}
});
$(document).ready(function() {
	$('#loaded_max').val(50);
});

Source

Prevent Multiple Submit of Your Form

$(document).ready(function() {
$('form').submit(function() {
if(typeof jQuery.data(this, "disabledOnSubmit") == 'undefined') {
jQuery.data(this, "disabledOnSubmit", { submited: true });
$('input[type=submit], input[type=button]', this).each(function() {
$(this).attr("disabled", "disabled");
});
return true;
}
else
{
return false;
}
});
});

Source

Make Entire Div Clickable

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

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Toggle Text

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

Source

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