由于内容比较多建议用CTRL+F搜索 偶然在网上看到这些不错的jQuery代码开发技巧。原文收集了30个，另外查找的时候发现了还有20个。加上另外十个实用的jQuery代码片段，共60个代码技巧，收集在一起分享给大家。 [img]http://files.jb51.net/file_images/article/201412/jquery-logo.jpg[/img] [h2]1. 创建一个嵌套的过滤器[/h2]

.filter(":not(:has(.selected))") //去掉所有不包含class为.selected的元素

[h2]2. 重用你的元素查询[/h2]

var allItems = $("div.item"); 
var keepList = $("div#container1 div.item"); 
<div>class names: 
$(formToLookAt + " input:checked").each(function() {  keepListkeepList = keepList.filter("." + $(this).attr("name")); });
</div>

[h2]3. 使用has()来判断一个元素是否包含特定的class或者元素[/h2]

//jQuery 1.4.* includes support for the has method. This method will find 
//if a an element contains a certain other element class or whatever it is 
//you are looking for and do anything you want to them. 
$("input").has(".email").addClass("email_icon");

[h2]4. 使用jQuery切换样式[/h2]

//Look for the media-type you wish to switch then set the href to your new style sheet 
$('link[media='screen']').attr('href', 'Alternative.css'); 

[h2]5. 限制选择的区域[/h2]

//Where possible, pre-fix your class names with a tag name 
//so that jQuery doesn't have to spend more time searching 
//for the element you're after. Also remember that anything 
//you can do to be more specific about where the element is 
//on your page will cut down on execution/search times 
var in_stock = $('#shopping_cart_items input.is_in_stock');

<ul id="shopping_cart_items"> 
<li> 
<input value="Item-X" name="item" class="is_in_stock" type="radio"> Item X</li> 
<li> 
<input value="Item-Y" name="item" class="3-5_days" type="radio"> Item Y</li> 
<li> 
<input value="Item-Z" name="item" class="unknown" type="radio"> Item Z</li> 
</ul> 

[h2]6. 如何正确使用ToggleClass[/h2]

//Toggle class allows you to add or remove a class 
//from an element depending on the presence of that 
//class. Where some developers would use: 
a.hasClass('blueButton') ? a.removeClass('blueButton') : a.addClass('blueButton'); 
//toggleClass allows you to easily do this using 
a.toggleClass('blueButton'); 

[h2]7. 设置IE指定的功能[/h2]

if ($.browser.msie) { // Internet Explorer is a sadist. } 

[h2]8. 使用jQuery来替换一个元素[/h2]

$('#thatdiv').replaceWith('fnuh');

[h2]9. 验证一个元素是否为空[/h2]

if ($('#keks').html()) { //Nothing found ;} 

[h2]10. 在无序的set中查找一个元素的索引[/h2]

$("ul > li").click(function () { 
 var index = $(this).prevAll().length; 
});

[h2]11. 绑定一个函数到一个事件[/h2]

$('#foo').bind('click', function() { 
 alert('User clicked on "foo."'); 
}); 

[h2]12. 添加HTML到一个元素[/h2]

$('#lal').append('sometext');

[h2]13. 创建元素时使用对象来定义属性[/h2]

var e = $("", { href: "#", class: "a-class another-class", title: "..." });

[h2]14. 使用过滤器过滤多属性[/h2]

//This precision-based approached can be useful when you use 
//lots of similar input elements which have different types 
var elements = $('#someid input[type=sometype][value=somevalue]').get(); 

[h2]15. 使用jQuery预加载图片[/h2]

jQuery.preloadImages = function() { for(var i = 0; i').attr('src', arguments[i]); } }; 
// Usage $.preloadImages('image1.gif', '/path/to/image2.png', 'some/image3.jpg'); 

[h2]16. 设置任何匹配一个选择器的事件处理程序[/h2]

$('button.someClass').live('click', someFunction);
 //Note that in jQuery 1.4.2, the delegate and undelegate options have been
 //introduced to replace live as they offer better support for context
 //For example, in terms of a table where before you would use..
 // .live()
 $("table").each(function(){
 $("td", this).live("hover", function(){
 $(this).toggleClass("hover");
 });
 });
 //Now use..
 $("table").delegate("td", "hover", function(){
 $(this).toggleClass("hover");
});

[h2]17. 找到被选择到的选项(option)元素[/h2]

$('#someElement').find('option:selected');

[h2]18. 隐藏包含特定值的元素[/h2]

$("p.value:contains('thetextvalue')").hide();

[h2]19. 自动的滚动到页面特定区域[/h2]

jQuery.fn.autoscroll = function(selector) {
 $('html,body').animate(
 {scrollTop: $(selector).offset().top},
 500
 );
}
//Then to scroll to the class/area you wish to get to like this:
$('.area_name').autoscroll();

[h2]20. 检测各种浏览器[/h2]

Detect Safari (if( $.browser.safari)),
Detect IE6 and over (if ($.browser.msie && $.browser.version > 6 )),
Detect IE6 and below (if ($.browser.msie && $.browser.version <= 6 )),
Detect FireFox 2 and above (if ($.browser.mozilla && $.browser.version >= '1.8' ))

[h2]21. 替换字符串中的单词[/h2]

var el = $('#id');
el.html(el.html().replace(/word/ig, ''));

[h2]22. 关闭右键的菜单[/h2]

$(document).bind('contextmenu',function(e){ return false; });

[h2]23. 定义一个定制的选择器[/h2]

$.expr[':'].mycustomselector = function(element, index, meta, stack){
// element- is a DOM element
// index - the current loop index in stack
// meta - meta data about your selector
// stack - stack of all elements to loop
// Return true to include current element
// Return false to explude current element
};
// Custom Selector usage:
$('.someClasses:test').doSomething();

[h2]24. 判断一个元素是否存在[/h2]

if ($('#someDiv').length) {//hooray!!! it exists...}

[h2]25. 使用jQuery判断鼠标的左右键点击[/h2]

$("#someelement").live('click', function(e) {
 if( (!$.browser.msie && e.button == 0) || ($.browser.msie && e.button == 1) ) {
  alert("Left Mouse Button Clicked");
 }
 else if(e.button == 2)
  alert("Right Mouse Button Clicked");
});

[h2]26. 显示或者删除输入框的缺省值[/h2]

//This snippet will show you how to keep a default value
//in a text input field for when a user hasn't entered in
//a value to replace it
swap_val = [];
$(".swap").each(function(i){
 swap_val[i] = $(this).val();
 $(this).focusin(function(){
  if ($(this).val() == swap_val[i]) {
   $(this).val("");
  }
 }).focusout(function(){
  if ($.trim($(this).val()) == "") {
   $(this).val(swap_val[i]);
  }
 });
});

<INPUT class=swap value="Enter Username here.." type=text> 

[h2]27. 指定时间后自动隐藏或者关闭元素(1.4支持）[/h2]

//Here's how we used to do it in 1.3.2 using setTimeout
setTimeout(function() {
 $('.mydiv').hide('blind', {}, 500)
}, 5000);
//And here's how you can do it with 1.4 using the delay() feature (this is a lot like sleep)
$(".mydiv").delay(5000).hide('blind', {}, 500);

[h2]28. 动态创建元素到DOM[/h2]

var newgbin1Div = $('');
newgbin1Div.attr('id','gbin1.com').appendTo('body');

[h2]29. 限制textarea的字符数量[/h2]

jQuery.fn.maxLength = function(max){
 this.each(function(){
 var type = this.tagName.toLowerCase();
 var inputType = this.type? this.type.toLowerCase() : null;
 if(type == "input" && inputType == "text" || inputType == "password"){
  //Apply the standard maxLength
  this.maxLength = max;
 }
 else if(type == "textarea"){
  this.onkeypress = function(e){
  var ob = e || event;
  var keyCode = ob.keyCode;
  var hasSelection = document.selection? document.selection.createRange().text.length > 0 : this.selectionStart != this.selectionEnd;
  return !(this.value.length >= max && (keyCode > 50 || keyCode == 32 || keyCode == 0 || keyCode == 13) && !ob.ctrlKey && !ob.altKey && !hasSelection);
  };
  this.onkeyup = function(){
  if(this.value.length > max){
   this.value = this.value.substring(0,max);
  }
  };
 }
 });
};
//Usage:
$('#gbin1textarea').maxLength(500);

[h2]30. 为函数创建一个基本测试用例[/h2]

//Separate tests into modules.
module("Module B");
test("some other gbin1.com test", function() {
 //Specify how many assertions are expected to run within a test.
 expect(2);
 //A comparison assertion, equivalent to JUnit's assertEquals.
 equals( true, false, "failing test" );
 equals( true, true, "passing test" );
});

[h2]31. 使用jQuery克隆元素[/h2]

var cloned = $('#gbin1div').clone();

[h2]32. 测试一个元素在jQuery中是否可见[/h2]

if($(element).is(':visible') == 'true') { //The element is Visible }

33. 元素屏幕居中

jQuery.fn.center = function () {
 this.css('position','absolute');
 this.css('top', ( $(window).height() - this.height() ) / +$(window).scrollTop() + 'px');
 this.css('left', ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + 'px');return this;
}
//Use the above function as: $('#gbin1div').center();

[h2]34. 使用特定名字的元素对应的值生成一个数组[/h2]

var arrInputValues = new Array();
$("input[name='table[]']").each(function(){
  arrInputValues.push($(this).val());
});

[h2]35. 剔除元素中的HTML[/h2]

(function($) {
 $.fn.stripHtml = function() {
  var regexp = /<("[^"]*"|'[^']*'|[^'">])*>/gi;
  this.each(function() {
   $(this).html(
    $(this).html().replace(regexp,"")
   );
  });
  return $(this);
 }
})(jQuery);
//usage:
$('p').stripHtml();

[h2]36. 使用closest来得到父元素[/h2]

$('#searchBox').closest('div');

[h2]37. 使用firebug来记录jQuery事件[/h2]

// Allows chainable logging
// Usage: $('#someDiv').hide().log('div hidden').addClass('someClass');
jQuery.log = jQuery.fn.log = function (msg) {
  if (console){
   console.log("%s: %o", msg, this);
  }
  return this;
};

[h2]38. 点击链接强制弹出新窗口[/h2]

jQuery('a.popup').live('click', function(){
 newwindow=window.open($(this).attr('href'),'','height=200,width=150');
 if (window.focus) {newwindow.focus()}
 return false;
});

[h2]39. 点击链接强制打开新标签页[/h2]

jQuery('a.newTab').live('click', function(){
 newwindow=window.open($(this).href);
 jQuery(this).target = "_blank";
 return false;
});

[h2]40. 使用siblings()来处理同类元素[/h2]

// Rather than doing this
$('#nav li').click(function(){
 $('#nav li').removeClass('active');
 $(this).addClass('active');
});
// Do this instead
$('#nav li').click(function(){
 $(this).addClass('active')
  .siblings().removeClass('active');
});

[h2]41. 选择或者不选页面上全部复选框[/h2]

var tog = false; // or true if they are checked on load
$('a').click(function() {
 $("input[type=checkbox]").attr("checked",!tog);
 tog = !tog;
});

[h2]42. 基于输入文字过滤页面元素[/h2]

//If the value of the element matches that of the entered text
//it will be returned
$('.gbin1Class').filter(function() {
 return $(this).attr('value') == $('input#gbin1Id').val() ;
 })

[h2]43. 取得鼠标的X和Y坐标[/h2]

$(document).mousemove(function(e){
$(document).ready(function() {
$().mousemove(function(e){
$('#XY').html("Gbin1 X Axis : " + e.pageX + " | Gbin1 Y Axis " + e.pageY);
});
});

[h2]44. 使得整个列表元素(LI)可点击[/h2]

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

<UL>
<LI><A href="#">GBin1 Link 1</A></LI>
<LI><A href="#">GBin1 Link 2</A></LI>
<LI><A href="#">GBin1 Link 3</A></LI>
<LI><A href="#">GBin1 Link 4</A></LI>
</UL> 

[h2]45. 使用jQuery来解析XML[/h2]

function parseXml(xml) {
 //find every Tutorial and print the author
 $(xml).find("Tutorial").each(function()
 {
 $("#output").append($(this).attr("author") + "");
 });
}

[h2]46. 判断一个图片是否加载完全[/h2]

$('#theGBin1Image').attr('src', 'image.jpg').load(function() {
alert('This Image Has Been Loaded');
});

[h2]47. 使用jQuery命名事件[/h2]

//Events can be namespaced like this
$('input').bind('blur.validation', function(e){
 // ...
});
//The data method also accept namespaces
$('input').data('validation.isValid', true);

[h2]48. 判断cookie是否激活或者关闭[/h2]

var dt = new Date();
dt.setSeconds(dt.getSeconds() + 60);
document.cookie = "cookietest=1; expires=" + dt.toGMTString();
var cookiesEnabled = document.cookie.indexOf("cookietest=") != -1;
if(!cookiesEnabled)
{
 //cookies have not been enabled
}

[h2]49. 强制过期cookie[/h2]

var date = new Date();
date.setTime(date.getTime() + (x * 60 * 1000));
$.cookie('example', 'foo', { expires: date });

[h2]50. 使用一个可点击的链接替换页面中所有URL[/h2]

$.fn.replaceUrl = function() {
  var regexp = /((ftp|http|https)://(w+:{0,1}w*@)?(S+)(:[0-9]+)?(/|/([w#!:.?+=&%@!-/]))?)/gi;
  this.each(function() {
   $(this).html(
    $(this).html().replace(regexp,'<A href="$1">$1</A>')
   );
  });
  return $(this);
 }
//usage
$('#GBin1div').replaceUrl(); 

[h2]51: 在表单中禁用“回车键”[/h2] 大家可能在表单的操作中需要防止用户意外的提交表单，那么下面这段代码肯定非常有帮助：

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

[h2]52: 清除所有的表单数据[/h2] 可能针对不同的表单形式，你需要调用不同类型的清楚方法，不过使用下面这个现成方法，绝对能让你省不少功夫。

function clearForm(form) {
 // iterate over all of the inputs for the form
 // element that was passed in
 $(':input', form).each(function() {
 var type = this.type;
 var tag = this.tagName.toLowerCase(); // normalize case
 // it's ok to reset the value attr of text inputs,
 // password inputs, and textareas
 if (type == 'text' || type == 'password' || tag == 'textarea')
  this.value = "";
 // checkboxes and radios need to have their checked state cleared
 // but should *not* have their 'value' changed
 else if (type == 'checkbox' || type == 'radio')
  this.checked = false;
 // select elements need to have their 'selectedIndex' property set to -1
 // (this works for both single and multiple select elements)
 else if (tag == 'select')
  this.selectedIndex = -1;
 });
};

[h2]53: 将表单中的按钮禁用[/h2] 下面的代码对于ajax操作非常有用，你可以有效的避免用户多次提交数据，个人也经常使用： 禁用按钮：

$("#somebutton").attr("disabled", true);

启动按钮：

$("#submit-button").removeAttr("disabled");

可能大家往往会使用.attr(‘disabled',false);，不过这是不正确的调用。 [h2]54: 输入内容后启用递交按钮[/h2] 这个代码和上面类似，都属于帮助用户控制表单递交按钮。使用这段代码后，递交按钮只有在用户输入指定内容后才可以启动。

$('#username').keyup(function() {
 $('#submit').attr('disabled', !$('#username').val()); 
});

[h2]55: 禁止多次递交表单[/h2] 多次递交表单对于web应用来说是个比较头疼的问题，下面的代码能够很好的帮助你解决这个问题：

$(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;
 }
 });
});

[h2]56: 高亮显示目前聚焦的输入框标示[/h2] 有时候你需要提示用户目前操作的输入框，你可以使用下面代码高亮显示标示：

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

[h2]57: 动态方式添加表单元素[/h2] 这个方法可以帮助你动态的添加表单中的元素，比如，input等：

//change event on password1 field to prompt new input
$('#password1').change(function() {
  //dynamically create new input and insert after password1
  $("#password1").append("<input type='text' name='password2' id='password2' />");
});

[h2]58: 自动将数据导入selectbox中[/h2] 下面代码能够使用ajax数据自动生成选择框的内容

$(function(){
 $("select#ctlJob").change(function(){
 $.getJSON("/select.php",{id: $(this).val(), ajax: 'true'}, function(j){
  var options = '';
  for (var i = 0; i < j.length; i++) {
  options += '<option value="' + j[i].optionValue + '">' + j[i].optionDisplay + '</option>';
  }
  $("select#ctlPerson").html(options);
 })
 })
})

[h2]59: 判断一个复选框是否被选中[/h2] 代码很简单，如下：

$('#checkBox').attr('checked');

[h2]60: 使用代码来递交表单[/h2] 代码很简单，如下：

$("#myform").submit();