翻译:Terry li - GBin1.com
英文: 50 jQuery Snippets That Will Help You Become A Better JavaScript Developer
.filter(":not(:has(.selected))") //去掉所有不包含class为.selected的元素
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>
//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");
//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');
//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 = $('#shopping_cart_items input.is_in_stock');
<ul id="shopping_cart_items">
<li>
<input value="Item-X" name="item" class="is_in_stock" type="radio"> Item X</li>
<li>
<input value="Item-Y" name="item" class="3-5_days" type="radio"> Item Y</li>
<li>
<input value="Item-Z" name="item" class="unknown" type="radio"> Item Z</li>
</ul>
//Toggle class allows you to add or remove a class //from an element depending on the presence of that //class. Where some developers would use: a.hasClass('blueButton') ? a.removeClass('blueButton') : a.addClass('blueButton'); //toggleClass allows you to easily do this using a.toggleClass('blueButton');
if ($.browser.msie) { // Internet Explorer is a sadist. }
$('#thatdiv').replaceWith('fnuh');
if ($('#keks').html()) { //Nothing found ;}
$("ul > li").click(function () { var index = $(this).prevAll().length; });
$('#foo').bind('click', function() { alert('User clicked on "foo."'); });
$('#lal').append('sometext');
var e = $("", { href: "#", class: "a-class another-class", title: "..." });
//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();15. 使用jQuery预加载图片
jQuery.preloadImages = function() {
for(var i = 0; i').attr('src', arguments[i]); } };
// Usage $.preloadImages('image1.gif', '/path/to/image2.png', 'some/image3.jpg');16. 设置任何匹配一个选择器的事件处理程序
$('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"); });17. 找到被选择到的选项(option)元素
$('#someElement').find('option:selected');18. 隐藏包含特定值的元素
$("p.value:contains('thetextvalue')").hide();19. 自动的滚动到页面特定区域
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();20. 检测各种浏览器
$('#someElement').find('option:selected');21. 替换字符串中的单词
var el = $('#id'); el.html(el.html().replace(/word/ig, ''));22. 关闭右键的菜单
$(document).bind('contextmenu',function(e){ return false; });23. 定义一个定制的选择器
$.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: $('.someClasses:test').doSomething();24. 判断一个元素是否存在
if ($('#someDiv').length) {//hooray!!! it exists...}25. 使用jQuery判断鼠标的左右键点击
$("#someelement").live('click', function(e) { if( (!$.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"); });
联系客服