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 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);

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><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 >1</div> <div >2</div> <div >3</div> <div >4</div> </div> </div>

以上这篇jQuery 常用代码集锦(必看篇)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持查字典教程网。