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18个很棒的jQuery代码片段分享

jQuery是当今最流行Web开发必备javascript库。本文收集了18个很棒的jQuery代码片段,希望这些代码片段能对大家有帮助。
1

jQuery实现的内链接平滑滚动

不需要使用太复杂的插件,只要使用下载这段代码即可实现基于内部链接的平滑滚动

$(‘a[href^=”#”]’).bind(‘click.smoothscroll’,function (e) {
e.preventDefault();

var anchor = this.hash,
$target = $(target);

$(‘html, body’).stop().animate({
‘scrollTop': $target.offset().top
}, 500, ‘swing’, function () {
window.location.hash = anchor;
});

});

 

使用jQuery获取所有节点

 

var $element = $(‘#gbtags’);
var $nodes = $element.contents();
$nodes.each(function() {
if(this.nodeType === 3 && $.trim($(this).text())) {
$(this).wrap(”);
}
});

 

限制选择框选择个数

 

$(“#categories option”).click(function(e){
if ($(this).parent().val().length < 2) {
$(this).removeAttr(“selected”);
}
});

 

jQuery使用通配符来删除class

 

var _c = ‘your-icon-class’

$(‘.currency’).removeClass (function (index, css) {
return (css.match (/\bicon-\S+/g) || []).join(‘ ‘);
}).addClass(‘icon-‘+_c);

 

切换启用和禁用

 

/* HTML
|
|
<input type=”text” value=”欢迎访问www.admin10000.com” /><input type=”button” value=”禁用按钮” />
|
|
*/

// Plugin
(function ($) {
$.fn.toggleDisabled = function () {
return this.each(function () {
var $this = $(this);
if ($this.attr(‘disabled’)) $this.removeAttr(‘disabled’);
else $this.attr(‘disabled’, ‘disabled’);
});
};
})(jQuery);

// TEST
$(function () {
$(‘input:button’).click(function () {
$(‘input:text’).toggleDisabled();
});
});

 

平滑滚动返回顶端

 

<h1 id=”anchor”>admin10000.com</h1>
<a href=”#anchor”>返回顶端</a>

$(document).ready(function () {

$(“a.topLink”).click(function () {
$(“html, body”).animate({
scrollTop: $($(this).attr(“href”)).offset().top + “px”
}, {
duration: 500,
easing: “swing”
});
return false;
});

});

 

使用jQuery和Google Analytics来跟踪表单

 

var array1 = [];
$(document).ready(function () {
$(‘input’).change(function () {
var formbox = $(this).attr(‘id’);
array1.push(formbox);
console.log(“you filled out box ” + array1);
});
$(‘#submit’).click(function () {
console.log(‘tracked ‘ + array1);
//alert(‘this is the order of boxes you filled out: ‘ + array1);
_gaq.push([‘_trackEvent’, ‘Form’, ‘completed’, ‘”‘ + array1 + ‘”‘]);
});
});

 

超简单的密码强度提示

 

 

$(‘#pass’).keyup(function (e) {
var strongRegex = new RegExp(“^(?=.{8,})(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*\W).*$”, “g”);
var mediumRegex = new RegExp(“^(?=.{7,})(((?=.*[A-Z])(?=.*[a-z]))|((?=.*[A-Z])(?=.*[0-9]))|((?=.*[a-z])(?=.*[0-9]))).*$”, “g”);
var enoughRegex = new RegExp(“(?=.{6,}).*”, “g”);
if (false == enoughRegex.test($(this).val())) {
$(‘#passstrength’).html(‘More Characters’);
} else if (strongRegex.test($(this).val())) {
$(‘#passstrength’).className = ‘ok';
$(‘#passstrength’).html(‘Strong!’);
} else if (mediumRegex.test($(this).val())) {
$(‘#passstrength’).className = ‘alert';
$(‘#passstrength’).html(‘Medium!’);
} else {
$(‘#passstrength’).className = ‘error';
$(‘#passstrength’).html(‘Weak!’);
}
return true;
});

 

jQuery生成一个自动停靠页尾效果

 

// Window load event used just in case window height is dependant upon images
$(window).bind(“load”, function () {
var footerHeight = 0,
footerTop = 0,
$footer = $(“#footer”);
positionFooter();

function positionFooter() {
footerHeight = $footer.height();
footerTop = ($(window).scrollTop() + $(window).height() – footerHeight) + “px”;
/* DEBUGGING
console.log(“Document height: “, $(document.body).height());
console.log(“Window height: “, $(window).height());
console.log(“Window scroll: “, $(window).scrollTop());
console.log(“Footer height: “, footerHeight);
console.log(“Footer top: “, footerTop);
*/
if (($(document.body).height() + footerHeight) < $(window).height()) {
$footer.css({
position: “absolute”
}).stop().animate({
top: footerTop
});
} else {
$footer.css({
position: “static”
});
}
}

$(window)
.scroll(positionFooter)
.resize(positionFooter);
});

 

预防对表单进行多次提交

 

$(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;
}
});
});

 

 图像等比例缩放

 

$(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
});

 

鼠标滑动时的渐入和渐出

 

$(document).ready(function(){
$(“.thumbs img”).fadeTo(“slow”, 0.6); // This sets the opacity of the thumbs to fade down to 60% when the page loads

$(“.thumbs img”).hover(function(){
$(this).fadeTo(“slow”, 1.0); // This should set the opacity to 100% on hover
},function(){
$(this).fadeTo(“slow”, 0.6); // This should set the opacity back to 60% on mouseout
});
});

 

让整个DIV可以被点击

 

<div class = “myBox” >
< a href = “http://www.admin10000.com” > admin10000.com < /a>
</div >

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

 

在新窗口打开链接 (target=”blank”)

 

 

$(‘a[@rel$=’external’]’).click(function(){
this.target = “_blank”;
});

/*
Usage:
<a href=”http://www.admin10000.com” rel=”external”>admin10000.com</a>
*/

 

制作等高的列

var max_height = 0;
$(“div.col”).each(function(){
if ($(this).height() > max_height) { max_height = $(this).height(); }
});
$(“div.col”).height(max_height);

 

图片预加载

 

 

(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.preLoadImages(“image1.gif”, “/path/to/image2.png”);

 

获取 URL 中传递的参数

 

$.urlParam = function(name){
var results = new RegExp(‘[\\?&]’ + name + ‘=([^&#]*)’).exec(window.location.href);
if (!results) { return 0; }
return results[1] || 0;
}

 

禁用表单的回车键提交

 

 

$(“#form”).keypress(function(e) {
if (e.which == 13) {
return false;
}
});

 

 

时间:2013-12-21

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