龙都娱乐»JavaScript»18个很棒的jQuery代码片段分享

18个很棒的jQuery代码片段分享

来源:Web龙都娱乐 发布时间:2013-12-20 阅读次数:
  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。

  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 class="topLink" href="http://cgxoncampus.com/quot;#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://cgxoncampus.com/"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://cgxoncampus.com/uot;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; } });
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