由于内容比较多建议用CTRL+F搜索
偶然在网上看到这些不错的
jquery
代码开发技巧。原文收集了30个,另外查找的时候发现了还有20个。加上另外十个实用的jquery代码片段,共60个代码技巧,收集在一起分享给大家。
1. 创建一个嵌套的过滤器
2. 重用你的元素查询
3. 使用has()来判断一个元素是否包含特定的class或者元素
4. 使用jQuery切换样式
5. 限制选择的区域
6. 如何正确使用ToggleClass
7. 设置IE指定的功能
8. 使用jQuery来替换一个元素
9. 验证一个元素是否为空
10. 在无序的set中查找一个元素的索引
11. 绑定一个函数到一个事件
12. 添加HTML到一个元素
13. 创建元素时使用对象来定义属性
14. 使用过滤器过滤多属性
15. 使用jQuery预加载图片
16. 设置任何匹配一个选择器的事件处理程序
17. 找到被选择到的选项(option)元素
18. 隐藏包含特定值的元素
19. 自动的滚动到页面特定区域
20. 检测各种浏览器
21. 替换字符串中的单词
22. 关闭右键的菜单
23. 定义一个定制的选择器
24. 判断一个元素是否存在
25. 使用jQuery判断鼠标的左右键点击
26. 显示或者删除输入框的缺省值
27. 指定时间后自动隐藏或者关闭元素(1.4支持)
28. 动态创建元素到DOM
29. 限制textarea的字符数量
30. 为函数创建一个基本测试用例
31. 使用jQuery克隆元素
32. 测试一个元素在jQuery中是否可见
33. 元素屏幕居中
34. 使用特定名字的元素对应的值生成一个数组
35. 剔除元素中的HTML
36. 使用closest来得到父元素
37. 使用firebug来记录jQuery事件
38. 点击链接强制弹出新窗口
39. 点击链接强制打开新标签页
40. 使用siblings()来处理同类元素
41. 选择或者不选页面上全部复选框
42. 基于输入文字过滤页面元素
43. 取得鼠标的X和Y坐标
44. 使得整个列表元素(LI)可点击
45. 使用jQuery来解析XML
46. 判断一个图片是否加载完全
47. 使用jQuery命名事件
48. 判断cookie是否激活或者关闭
49. 强制过期cookie
50. 使用一个可点击的链接替换页面中所有URL
51: 在表单中禁用“回车键”
大家可能在表单的操作中需要防止用户意外的提交表单,那么下面这段代码肯定非常有帮助:
52: 清除所有的表单数据
可能针对不同的表单形式,你需要调用不同类型的清楚方法,不过使用下面这个现成方法,绝对能让你省不少功夫。
53: 将表单中的按钮禁用
下面的代码对于ajax操作非常有用,你可以有效的避免用户多次提交数据,个人也经常使用:
禁用按钮:
启动按钮:
可能大家往往会使用.attr(‘disabled',false);,不过这是不正确的调用。
基于jQuery的AJAX和JSON的实例 中文WORD版
本文档主要讲述的是基于jQuery的AJAX和JSON的实例;过jQuery内置的AJAX功能,直接访问后台获得JSON格式的数据,然后通过jQuer把数据绑定到事先设计好的html模板上,直接在页面上显示。有需要的朋友可以下载看看
下载
54: 输入内容后启用递交按钮
这个代码和上面类似,都属于帮助用户控制表单递交按钮。使用这段代码后,递交按钮只有在用户输入指定内容后才可以启动。
55: 禁止多次递交表单
多次递交表单对于web应用来说是个比较头疼的问题,下面的代码能够很好的帮助你解决这个问题:
56: 高亮显示目前聚焦的输入框标示
有时候你需要提示用户目前操作的输入框,你可以使用下面代码高亮显示标示:
57: 动态方式添加表单元素
这个方法可以帮助你动态的添加表单中的元素,比如,input等:
58: 自动将数据导入selectbox中
下面代码能够使用ajax数据自动生成选择框的内容
59: 判断一个复选框是否被选中
代码很简单,如下:
60: 使用代码来递交表单
代码很简单,如下:
.filter(":not(:has(.selected))") //去掉所有不包含class为.selected的元素
var allItems = $("div.item");
var keepList = $("div#container1 div.item");
class names:
$(formToLookAt + " input:checked").each(function() { keepListkeepList = keepList.filter("." + $(this).attr("name")); });
//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");
//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');
//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 = $('#shopping_cart_items input.is_in_stock');
-
Item X
-
Item Y
-
Item Z
//Toggle class allows you to add or remove a class
//from an element depending on the presence of that
//class. Where some developers would use:
a.hasClass('blueButton') ? a.removeClass('blueButton') : a.addClass('blueButton');
//toggleClass allows you to easily do this using
a.toggleClass('blueButton');
if ($.browser.msie) { // Internet Explorer is a sadist. }
$('#thatdiv').replaceWith('fnuh');
if ($('#keks').html()) { //Nothing found ;}
$("ul > li").click(function () {
var index = $(this).prevAll().length;
});
$('#foo').bind('click', function() {
alert('User clicked on "foo."');
});
$('#lal').append('sometext');
var e = $("", { href: "#", class: "a-class another-class", title: "..." });
//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();
jQuery.preloadImages = function() { for(var i = 0; i').attr('src', arguments[i]); } };
// Usage $.preloadImages('image1.gif', '/path/to/image2.png', 'some/image3.jpg');
$('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");
});
$('#someElement').find('option:selected');
$("p.value:contains('thetextvalue')").hide();
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();
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' ))
var el = $('#id');
el.html(el.html().replace(/word/ig, ''));
$(document).bind('contextmenu',function(e){ return false; });
$.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:
$('.someClasses:test').doSomething();
if ($('#someDiv').length) {//hooray!!! it exists...}
$("#someelement").live('click', function(e) {
if( (!$.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");
});
//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]);
}
});
});
//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);
var newgbin1Div = $('');
newgbin1Div.attr('id','gbin1.com').appendTo('body');
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);
//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" );
});
var cloned = $('#gbin1div').clone();
if($(element).is(':visible') == 'true') { //The element is Visible }
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();
var arrInputValues = new Array();
$("input[name='table[]']").each(function(){
arrInputValues.push($(this).val());
});
(function($) {
$.fn.stripHtml = function() {
var regexp = /<("[^"]*"|'[^']*'|[^'">])*>/gi;
this.each(function() {
$(this).html(
$(this).html().replace(regexp,"")
);
});
return $(this);
}
})(jQuery);
//usage:
$('p').stripHtml();
$('#searchBox').closest('div');
// Allows chainable logging
// Usage: $('#someDiv').hide().log('div hidden').addClass('someClass');
jQuery.log = jQuery.fn.log = function (msg) {
if (console){
console.log("%s: %o", msg, this);
}
return this;
};
jQuery('a.popup').live('click', function(){
newwindow=window.open($(this).attr('href'),'','height=200,width=150');
if (window.focus) {newwindow.focus()}
return false;
});
jQuery('a.newTab').live('click', function(){
newwindow=window.open($(this).href);
jQuery(this).target = "_blank";
return false;
});
// 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');
});
var tog = false; // or true if they are checked on load
$('a').click(function() {
$("input[type=checkbox]").attr("checked",!tog);
tog = !tog;
});
//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() ;
})
$(document).mousemove(function(e){
$(document).ready(function() {
$().mousemove(function(e){
$('#XY').html("Gbin1 X Axis : " + e.pageX + " | Gbin1 Y Axis " + e.pageY);
});
});
$("ul li").click(function(){
window.location=$(this).find("a").attr("href"); return false;
});
- GBin1 Link 1
- GBin1 Link 2
- GBin1 Link 3
- GBin1 Link 4
function parseXml(xml) {
//find every Tutorial and print the author
$(xml).find("Tutorial").each(function()
{
$("#output").append($(this).attr("author") + "");
});
}
$('#theGBin1Image').attr('src', 'image.jpg').load(function() {
alert('This Image Has Been Loaded');
});
//Events can be namespaced like this
$('input').bind('blur.validation', function(e){
// ...
});
//The data method also accept namespaces
$('input').data('validation.isValid', true);
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
}
var date = new Date();
date.setTime(date.getTime() + (x * 60 * 1000));
$.cookie('example', 'foo', { expires: date });
$.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();
$("#form").keypress(function(e) {
if (e.which == 13) {
return false;
}
});
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;
});
};
$("#somebutton").attr("disabled", true);
$("#submit-button").removeAttr("disabled");
$('#username').keyup(function() {
$('#submit').attr('disabled', !$('#username').val());
});
$(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;
}
});
});
$("form :input").focus(function() {
$("label[for='" + this.id + "']").addClass("labelfocus");
}).blur(function() {
$("label").removeClass("labelfocus");
});
//change event on password1 field to prompt new input
$('#password1').change(function() {
//dynamically create new input and insert after password1
$("#password1").append("");
});
$(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 += '';
}
$("select#ctlPerson").html(options);
})
})
})
$('#checkBox').attr('checked');
$("#myform").submit();