本篇文章给大家分享的是有关jQuery代码开发技巧都有哪些，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
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1. 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2. 重用你的元素查询
var allItems = $("div.item");
var keepList = $("div#container1 div.item");
class names:
$(formToLookAt + " input:checked").each(function() { keepListkeepList = keepList.filter("." + $(this).attr("name")); });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. $("input").has(".email").addClass("email_icon");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 = $('#shopping_cart_items input.is_in_stock');
Item X
Item Y
Item Z
6. 如何正确使用ToggleClass
//Toggle class allows you to add or remove a class //from an element depending on the presence of that //class. Where some developers would use: a.hasClass('blueButton') ? a.removeClass('blueButton') : a.addClass('blueButton');
//toggleClass allows you to easily do this using a.toggleClass('blueButton');7. 设置IE指定的功能
if ($.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
$('#lal').append('sometext');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');16. 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");
});17. 找到被选择到的选项(option)元素
$('#someElement').find('option:selected');18. 隐藏包含特定值的元素
$("p.value:contains('thetextvalue')").hide();19. 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();20. 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' ))
21. 替换字符串中的单词
var el = $('#id');
el.html(el.html().replace(/word/ig, ''));22. 关闭右键的菜单
$(document).bind('contextmenu',function(e){ return false; });23. 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();24. 判断一个元素是否存在
if ($('#someDiv').length) {//hooray!!! it exists...}25. 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");
});26. 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 itswap_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]);
}
});
});
27. 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 setTimeoutsetTimeout(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);
28. 动态创建元素到DOMvar newgbin1Div = $('');
newgbin1Div.attr('id','gbin1.com').appendTo('body');
29. 限制textarea的字符数量jQuery.fn.maxLength = function(max){this.each(function(){var type = this.tagName.toLowerCase();var inputType = this.type? this.type.toLowerCase() : null;if(type == "input" && inputType == "text" || inputType == "password"){//Apply the standard maxLengththis.maxLength = max;
}else if(type == "textarea"){this.onkeypress = function(e){var ob = e || event;var keyCode = ob.keyCode;var hasSelection = document.selection? document.selection.createRange().text.length > 0 : this.selectionStart != this.selectionEnd;return !(this.value.length >= max && (keyCode > 50 || keyCode == 32 || keyCode == 0 || keyCode == 13) && !ob.ctrlKey && !ob.altKey && !hasSelection);
};this.onkeyup = function(){if(this.value.length > max){this.value = this.value.substring(0,max);
}
};
}
});
};//Usage:$('#gbin1textarea').maxLength(500);
30. 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" );
});
31. 使用jQuery克隆元素var cloned = $('#gbin1div').clone();
32. 测试一个元素在jQuery中是否可见if($(element).is(':visible') == 'true') { //The element is Visible } 33. 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();
34. 使用特定名字的元素对应的值生成一个数组var arrInputValues = new Array();
$("input[name='table[]']").each(function(){
arrInputValues.push($(this).val());
});
35. 剔除元素中的HTML(function($) {
$.fn.stripHtml = function() {var regexp = /<("[^"]*"|'[^']*'|[^'">])*>/gi;this.each(function() {
$(this).html(
$(this).html().replace(regexp,"")
);
});return $(this);
}
})(jQuery);//usage:$('p').stripHtml();
36. 使用closest来得到父元素
$('#searchBox').closest('div');
37. 使用firebug来记录jQuery事件// Allows chainable logging// Usage: $('#someDiv').hide().log('div hidden').addClass('someClass');jQuery.log = jQuery.fn.log = function (msg) {if (console){
console.log("%s: %o", msg, this);
}return this;
};
38. 点击链接强制弹出新窗口jQuery('a.popup').live('click', function(){
newwindow=window.open($(this).attr('href'),'','height=200,width=150');if (window.focus) {newwindow.focus()}return false;
});
39. 点击链接强制打开新标签页jQuery('a.newTab').live('click', function(){
newwindow=window.open($(this).href);
jQuery(this).target = "_blank";return false;
});
40. 使用siblings()来处理同类元素// Rather than doing this$('#nav li').click(function(){
$('#nav li').removeClass('active');
$(this).addClass('active');
});// Do this instead$('#nav li').click(function(){
$(this).addClass('active')
.siblings().removeClass('active');
});
41. 选择或者不选页面上全部复选框var tog = false; // or true if they are checked on load$('a').click(function() {
$("input[type=checkbox]").attr("checked",!tog);
tog = !tog;
});
42. 基于输入文字过滤页面元素//If the value of the element matches that of the entered text//it will be returned$('.gbin1Class').filter(function() {return $(this).attr('value') == $('input#gbin1Id').val() ;
})
43. 取得鼠标的X和Y坐标$(document).mousemove(function(e){
$(document).ready(function() {
$().mousemove(function(e){
$('#XY').html("Gbin1 X Axis : " + e.pageX + " | Gbin1 Y Axis " + e.pageY);
});
});
44. 使得整个列表元素(LI)可点击$("ul li").click(function(){
window.location=$(this).find("a").attr("href"); return false;
});
GBin1 Link 1 GBin1 Link 2 GBin1 Link 3 GBin1 Link 4
45. 使用jQuery来解析XMLfunction parseXml(xml) {//find every Tutorial and print the author$(xml).find("Tutorial").each(function()
{
$("#output").append($(this).attr("author") + "");
});
}
46. 判断一个图片是否加载完全$('#theGBin1Image').attr('src', 'image.jpg').load(function() {
alert('This Image Has Been Loaded');
});
47. 使用jQuery命名事件//Events can be namespaced like this$('input').bind('blur.validation', function(e){// ...});//The data method also accept namespaces$('input').data('validation.isValid', true);
48. 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}
49. 强制过期cookievar date = new Date();
date.setTime(date.getTime() + (x * 60 * 1000));
$.cookie('example', 'foo', { expires: date });
50. 使用一个可点击的链接替换页面中所有URL$.fn.replaceUrl = function() {var regexp = /((ftp|http|https)://(w+:{0,1}w*@)?(S+)(:[0-9]+)?(/|/([w#!:.?+=&%@!-/]))?)/gi;this.each(function() {
$(this).html(
$(this).html().replace(regexp,'$1')
);
});return $(this);
}//usage$('#GBin1div').replaceUrl(); 以上就是jQuery代码开发技巧都有哪些，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。
