发布于 2017-02-12 04:08:35 | 102 次阅读 | 评论: 0 | 来源: 网友投递
jQuery javascript框架
jQuery是一个兼容多浏览器的javascript框架，核心理念是write less,do more(写得更少,做得更多)。jQuery在2006年1月由美国人John Resig在纽约的barcamp发布，吸引了来自世界各地的众多JavaScript高手加入，由Dave Methvin率领团队进行开发。
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;
});
});
2、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('');
}
});
3、限制选择框选择个数
$("#categories option").click(function(e){
if ($(this).parent().val().length < 2) {
$(this).removeAttr("selected");
}
});
4、jQuery使用通配符来删除class
var _c = 'your-icon-class'
$('.currency').removeClass (function (index, css) {
return (css.match (/\bicon-\S+/g) || []).join(' ');
}).addClass('icon-'+_c);
5、切换启用和禁用
/* HTML
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<input type="text" value="欢迎访问www.admin10000.com" /><input type="button" value="禁用按钮" />
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*/
// Plugin
(function ($) {
$.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();
});
});
6、平滑滚动返回顶端
<h1 id="anchor">admin10000.com</h1>
<a class="topLink" 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;
});
});
7、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 + '"']);
});
});
8、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;
});
9、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);
});
10、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;
}
});
});
11、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
});
12、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
});
});
13、制作等高的列
var max_height = 0;
$("div.col").each(function(){
if ($(this).height() > max_height) { max_height = $(this).height(); }
});
$("div.col").height(max_height);
14、图片预加载
(function($) {
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");
15、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;
}
16、禁用表单的回车键提交
$("#form").keypress(function(e) {
if (e.which == 13) {
return false;
}
});
17、让整个DIV可以被点击
<div class = "myBox" >
< a href = "http://www.phperz.com" > www.phperz.com < /a>
</div >
$(".myBox").click(function(){
window.location=$(this).find("a").attr("href");
return false;
});
18、在新窗口打开链接 (target=”blank”)
$('a[@rel$='external']').click(function(){
this.target = "_blank";
});
大家可以结合之前小编整理的文章进行学习，把实用的jQuery代码片段进行汇总，以便日后学习使用。