由于內(nèi)容比較多建議用CTRL+F搜索

偶然在網(wǎng)上看到這些不錯的jQuery代碼開發(fā)技巧。原文收集了30個，另外查找的時候發(fā)現(xiàn)了還有20個。加上另外十個實用的jQuery代碼片段，共60個代碼技巧，收集在一起分享給大家。

1. 創(chuàng)建一個嵌套的過濾器

.filter(":not(:has(.selected))") //去掉所有不包含class為.selected的元素

2. 重用你的元素查詢

var allItems = $("div.item"); 
var keepList = $("div#container1 div.item"); 
<div>class names: 
$(formToLookAt + " input:checked").each(function() {  keepListkeepList = keepList.filter("." + $(this).attr("name")); });
</div>

3. 使用has()來判斷一個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切換樣式

//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. 限制選擇的區(qū)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');

<ul id="shopping_cart_items"> 
<li> 
<input value="Item-X" name="item" class="is_in_stock" type="radio"> Item X</li> 
<li> 
<input value="Item-Y" name="item" class="3-5_days" type="radio"> Item Y</li> 
<li> 
<input value="Item-Z" name="item" class="unknown" type="radio"> Item Z</li> 
</ul> 

6. 如何正確使用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. 設置IE指定的功能

if ($.browser.msie) { // Internet Explorer is a sadist. } 

8. 使用jQuery來替換一個元素

$('#thatdiv').replaceWith('fnuh');

9. 驗證一個元素是否為空

if ($('#keks').html()) { //Nothing found ;} 

10. 在無序的set中查找一個元素的索引

$("ul > li").click(function () { 
 var index = $(this).prevAll().length; 
});

11. 綁定一個函數(shù)到一個事件

$('#foo').bind('click', function() { 
 alert('User clicked on "foo."'); 
}); 

12. 添加HTML到一個元素

$('#lal').append('sometext');

13. 創(chuàng)建元素時使用對象來定義屬性

var e = $("", { href: "#", class: "a-class another-class", title: "..." });

14. 使用過濾器過濾多屬性

//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預加載圖片

jQuery.preloadImages = function() { for(var i = 0; i').attr('src', arguments[i]); } }; 
// Usage $.preloadImages('image1.gif', '/path/to/image2.png', 'some/image3.jpg'); 

16. 設置任何匹配一個選擇器的事件處理程序

$('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. 找到被選擇到的選項(option)元素

$('#someElement').find('option:selected');

18. 隱藏包含特定值的元素

$("p.value:contains('thetextvalue')").hide();

19. 自動的滾動到頁面特定區(qū)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. 檢測各種瀏覽器

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. 替換字符串中的單詞

var el = $('#id');
el.html(el.html().replace(/word/ig, ''));

22. 關閉右鍵的菜單

$(document).bind('contextmenu',function(e){ return false; });

23. 定義一個定制的選擇器

$.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. 判斷一個元素是否存在

if ($('#someDiv').length) {//hooray!!! it exists...}

25. 使用jQuery判斷鼠標的左右鍵點擊

$("#someelement").live('click', function(e) {
 if( (!$.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. 顯示或者刪除輸入框的缺省值

//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 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]);
  }
 });
});

<INPUT class=swap value="Enter Username here.." type=text> 

27. 指定時間后自動隱藏或者關閉元素(1.4支持）

//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);

28. 動態(tài)創(chuàng)建元素到DOM

var newgbin1Div = $('');
newgbin1Div.attr('id','gbin1.com').appendTo('body');

29. 限制textarea的字符數(shù)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);

30. 為函數(shù)創(chuàng)建一個基本測試用例

//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. 測試一個元素在jQuery中是否可見

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對應的值生成一個數(shù)組

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來得到父元素

$('#searchBox').closest('div');

37. 使用firebug來記錄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. 點擊鏈接強制彈出新窗口

jQuery('a.popup').live('click', function(){
 newwindow=window.open($(this).attr('href'),'','height=200,width=150');
 if (window.focus) {newwindow.focus()}
 return false;
});

39. 點擊鏈接強制打開新標簽頁

jQuery('a.newTab').live('click', function(){
 newwindow=window.open($(this).href);
 jQuery(this).target = "_blank";
 return false;
});

40. 使用siblings()來處理同類元素

// 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. 選擇或者不選頁面上全部復選框

var tog = false; // or true if they are checked on load
$('a').click(function() {
 $("input[type=checkbox]").attr("checked",!tog);
 tog = !tog;
});

42. 基于輸入文字過濾頁面元素

//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. 取得鼠標的X和Y坐標

$(document).mousemove(function(e){
$(document).ready(function() {
$().mousemove(function(e){
$('#XY').html("Gbin1 X Axis : " + e.pageX + " | Gbin1 Y Axis " + e.pageY);
});
});

44. 使得整個列表元素(LI)可點擊

$("ul li").click(function(){
 window.location=$(this).find("a").attr("href"); return false;
});

<UL>
<LI><A href="#">GBin1 Link 1</A></LI>
<LI><A href="#">GBin1 Link 2</A></LI>
<LI><A href="#">GBin1 Link 3</A></LI>
<LI><A href="#">GBin1 Link 4</A></LI>
</UL> 

45. 使用jQuery來解析XML

function parseXml(xml) {
 //find every Tutorial and print the author
 $(xml).find("Tutorial").each(function()
 {
 $("#output").append($(this).attr("author") + "");
 });
}

46. 判斷一個圖片是否加載完全

$('#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. 判斷cookie是否激活或者關閉

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. 強制過期cookie

var date = new Date();
date.setTime(date.getTime() + (x * 60 * 1000));
$.cookie('example', 'foo', { expires: date });

50. 使用一個可點擊的鏈接替換頁面中所有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,'<A href="$1">$1</A>')
   );
  });
  return $(this);
 }
//usage
$('#GBin1div').replaceUrl(); 

51: 在表單中禁用“回車鍵”

大家可能在表單的操作中需要防止用戶意外的提交表單，那么下面這段代碼肯定非常有幫助：

$("#form").keypress(function(e) {
 if (e.which == 13) {
 return false;
 }
});

52: 清除所有的表單數(shù)據(jù)

可能針對不同的表單形式，你需要調(diào)用不同類型的清楚方法，不過使用下面這個現(xiàn)成方法，絕對能讓你省不少功夫。

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;
 });
};

53: 將表單中的按鈕禁用

下面的代碼對于ajax操作非常有用，你可以有效的避免用戶多次提交數(shù)據(jù)，個人也經(jīng)常使用：

禁用按鈕：

$("#somebutton").attr("disabled", true);

啟動按鈕：

$("#submit-button").removeAttr("disabled");

可能大家往往會使用.attr(‘disabled',false);，不過這是不正確的調(diào)用。

54: 輸入內(nèi)容后啟用遞交按鈕

這個代碼和上面類似，都屬于幫助用戶控制表單遞交按鈕。使用這段代碼后，遞交按鈕只有在用戶輸入指定內(nèi)容后才可以啟動。

$('#username').keyup(function() {
 $('#submit').attr('disabled', !$('#username').val()); 
});

55: 禁止多次遞交表單

多次遞交表單對于web應用來說是個比較頭疼的問題，下面的代碼能夠很好的幫助你解決這個問題：

$(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;
 }
 });
});

56: 高亮顯示目前聚焦的輸入框標示

有時候你需要提示用戶目前操作的輸入框，你可以使用下面代碼高亮顯示標示：

$("form :input").focus(function() {
 $("label[for='" + this.id + "']").addClass("labelfocus");
}).blur(function() {
 $("label").removeClass("labelfocus");
});

57: 動態(tài)方式添加表單元素

這個方法可以幫助你動態(tài)的添加表單中的元素，比如，input等：

//change event on password1 field to prompt new input
$('#password1').change(function() {
  //dynamically create new input and insert after password1
  $("#password1").append("<input type='text' name='password2' id='password2' />");
});

58: 自動將數(shù)據(jù)導入selectbox中

下面代碼能夠使用ajax數(shù)據(jù)自動生成選擇框的內(nèi)容

$(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);
 })
 })
})

59: 判斷一個復選框是否被選中

代碼很簡單，如下：

$('#checkBox').attr('checked');

60: 使用代碼來遞交表單

代碼很簡單，如下：

$("#myform").submit();

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