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