jQuery常⽤代码集锦（必看篇）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.Seconds() + 60);
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 formjquery弹出div窗口
// element that was passed in
$(':input', form).each(function() {
var type = pe;
var tag = LowerCase(); // 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
$('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
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()
$("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 && $.browser.version <= 6 )),
Detect FireFox 2 and above (if ($.illa && $.browser.version >= '1.8' )
20.限制textarea的字符数量
jQuery.fn.maxLength = function(max){
this.each(function(){
var type = LowerCase();
var inputType = pe? LowerCase() : null;
if(type == "input" && inputType == "text" || inputType == "password"){
//Apply the standard maxLength
this.maxLength = max;
}
else if(type == "textarea"){
var ob = e || event;
var keyCode = ob.keyCode;
var hasSelection = document.selection? ateRange().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);  };
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
= 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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