37. 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"); });

38. 找到被选择到的选项(option)元素

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

39. 隐藏包含特定值的元素

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

40. 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();

42. 检测各种浏览器

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' ))

42. 替换字符串中的单词

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

43. 关闭右键的菜单

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

44. 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();

45. 判断一个元素是否存在

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

46. 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"); });

47. 显示或者删除输入框的缺省值

//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>

48. 指定时间后自动隐藏或者关闭元素(1.4支持）

//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);

49. 动态创建元素到DOM

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

50. 限制textarea的字符数量

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);

51. 为函数创建一个基本测试用例

//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" ); });

52. 使用jQuery克隆元素

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

53. 测试一个元素在jQuery中是否可见

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