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1. 选择或者不选页面上全部复选框
var tog = false; // or true if they are checked on load$("a").click(function() { $("input[type=checkbox]").attr("checked",!tog); tog = !tog;});
2. 取得鼠标的X和Y坐标
$(document).mousemove(function(e){$(document).ready(function() {$().mousemove(function(e){$("#XY").html("Gbin1 X Axis : " + e.pageX + " | Gbin1 Y Axis " + e.pageY);});});
3. 判断一个图片是否加载完全
$("#theGBin1Image").attr("src", "image.jpg").load(function() {alert("This Image Has Been Loaded");});
4. 判断cookie是否激活或者关闭
var dt = new Date();dt.setSeconds(dt.getSeconds() + 60);document.cookie = "cookietest=1; expires=" + dt.toGMTString();var cookiesEnabled = document.cookie.indexOf("cookietest=") != -1;if(!cookiesEnabled){ //cookies have not been enabled}
5. 强制过期cookie
var date = new Date();date.setTime(date.getTime() + (x * 60 * 1000));$.cookie("example", "foo", { expires: date });
6. 在表单中禁用“回车键”,表单的操作中需要防止用户意外的提交表单
$("#form").keypress(function(e) { if (e.which == 13) { return false; }});
7. 清除所有的表单数据
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; });};
8.禁止多次递交表单
$(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; } });});
9. 自动将数据导入selectbox中
$(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); }) })})
10. 创建一个嵌套的过滤器
.filter(":not(:has(.selected))") //去掉所有不包含class为.selected的元素
11. 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. $("input").has(".email").addClass("email_icon");
12. 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"); 
13. 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");
14. 使用jQuery来替换一个元素
$("#thatdiv").replaceWith("fnuh");
15.绑定一个函数到一个事件
$("#foo").bind("click", function() {alert("User clicked on "foo.""); }); 
16. 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"); 
17. 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");});
18. 自动的滚动到页面特定区域
jQuery.fn.autoscroll = function(selector) { $("html,body").animate( {scrollTop: $(selector).offset().top}, );}//Then to scroll to the class/area you wish to get to like this:$(".area_name").autoscroll();
19.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" )
20.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 maxLengththis.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);
21.使用jQuery克隆元素
var cloned = $("#gbin1div").clone();
22. 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();
23 .简单的tab标签切换
jQuery("#meeting_tabs ul li").click(function(){jQuery(this).addClass("tabulous_active").siblings().removeClass("tabulous_active");jQuery("#tabs_container>.pane:eq("+jQuery(this).index()+")").show().siblings().hide();})<div id="meeting_tabs"><ul><li class="tabulous_active"><a href="#" title="">进行中</a></li><li><a href="#" title="">未开始</a></li><li><a href="#" title="">已结束</a></li><li><a href="#" title="">全部</a></li> </ul> <div id="tabs_container"> <div class="pane">1</div> <div class="pane">2</div> <div class="pane">3</div> <div class="pane">4</div> </div></div>
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