注册 登录  
 加关注
   显示下一条  |  关闭
温馨提示!由于新浪微博认证机制调整,您的新浪微博帐号绑定已过期,请重新绑定!立即重新绑定新浪微博》  |  关闭

享受编码

    的乐趣

 
 
 

日志

 
 

分享50个使你成为高级javascript开发者的jQuery的代码开发  

2011-07-10 09:31:13|  分类: JavaScript |  标签: |举报 |字号 订阅

  下载LOFTER 我的照片书  |

翻译:Terry li - GBin1.com
英文: 50 jQuery Snippets That Will Help You Become A Better JavaScript Developer


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

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');  
<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 &amp;&amp; $.browser.version &gt; 6 )),  Detect IE6 and below (if ($.browser.msie &amp;&amp; $.browser.version &lt;= 6 )),  Detect FireFox 2 and above (if ($.browser.mozilla &amp;&amp; $.browser.version &gt;= '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 &amp;&amp; e.button == 0) || ($.browser.msie &amp;&amp; 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 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 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. 动态创建元素到DOM
var 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" &amp;&amp; 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 &gt; 0 : this.selectionStart != this.selectionEnd;          return !(this.value.length &gt;= max &amp;&amp; (keyCode &gt; 50 || keyCode == 32 || keyCode == 0 || keyCode == 13) &amp;&amp; !ob.ctrlKey &amp;&amp; !ob.altKey &amp;&amp; !hasSelection);        };        this.onkeyup = function(){          if(this.value.length &gt; 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 = /&lt;("[^"]*"|'[^']*'|[^'"&gt;])*&gt;/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;  });  
<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来解析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cookie
var 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#!:.?+=&amp;%@!-/]))?)/gi;          this.each(function() {              $(this).html(                  $(this).html().replace(regexp,'<A href="$1">$1</A>')              );          });          return $(this);      }  //usage  $('#GBin1div').replaceUrl(); 
  评论这张
 
阅读(746)| 评论(0)
推荐 转载

历史上的今天

评论

<#--最新日志,群博日志--> <#--推荐日志--> <#--引用记录--> <#--博主推荐--> <#--随机阅读--> <#--首页推荐--> <#--历史上的今天--> <#--被推荐日志--> <#--上一篇,下一篇--> <#-- 热度 --> <#-- 网易新闻广告 --> <#--右边模块结构--> <#--评论模块结构--> <#--引用模块结构--> <#--博主发起的投票-->
 
 
 
 
 
 
 
 
 
 
 
 
 
 

页脚

网易公司版权所有 ©1997-2017