翻译:Terry li - GBin1.com
英文: 50 jQuery Snippets That Will Help You Become A Better JavaScript Developer
keepListkeepList = keepList.filter("." + $(this).attr("name")); }); </div> 3. 使用has()来判断一个元素是否包含特定的class或者元素//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. $( 4. 使用jQuery切换样式//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'); 5. 限制选择的区域//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 = $('#shopping_cart_items input.is_in_stock'); <ul> <li> <input value="Item-X" type="radio"> Item X</li> <li> <input value="Item-Y" type="radio"> Item Y</li> <li> <input value="Item-Z" type="radio"> Item Z</li> </ul> 6. 如何正确使用ToggleClass//Toggle class allows you to add or remove a class //from an element depending on the presence of that //class. Where some developers would use: a.hasClass('blueButton') ? a.removeClass('blueButton') : a.addClass('blueButton'); //toggleClass allows you to easily do this using a.toggleClass('blueButton'); 7. 设置IE指定的功能if ($.browser.msie) { // Internet Explorer is a sadist. } 8. 使用jQuery来替换一个元素$('#thatdiv').replaceWith('fnuh'); 9. 验证一个元素是否为空if ($('#keks').html()) { //Nothing found ;} 10. 在无序的set中查找一个元素的索引$("ul > li").click(function () { var index = $(this).prevAll().length; }); 11. 绑定一个函数到一个事件$('#foo').bind('click', function() { alert('User clicked on "foo."'); }); 12. 添加HTML到一个元素 13. 创建元素时使用对象来定义属性var e = $("", { href: "#", class: "a-class another-class", title: "..." }); 14. 使用过滤器过滤多属性//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 $.preloadImages('image1.gif', '/path/to/image2.png', 'some/image3.jpg');
($.browser.msie && e.button == 1) ) { alert("Left Mouse Button Clicked"); } else if(e.button == 2) alert("Right Mouse Button Clicked"); });