Jquery使用小技巧汇总

下面列出了一些Jquery使用技巧。比如有禁止右键点击、隐藏搜索文本框文字、在新窗口中打开链接、检测浏览器、预加载图片、页面样式切换、所有列等高、动态控制页面字体大小、获得鼠标指针的X值Y值、验证元素是否为空、替换元素、延迟加载、验证元素是否存在于Jquery集合中、使DIV可点击、克隆对象、使元素居中、计算元素个数、使用Google主机上的Jquery类库、禁用Jquery效果、解决Jquery类库与其他Javascript类库冲突问题。

1. 禁止右键点击

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

2. 隐藏搜索文本框文字
Hide when clicked in the search field, the value.(example can be found below in the comment fields)

$(document).ready(function() {
$("input.text1").val("Enter your search text here");
  textFill($('input.text1'));
});
 
  function textFill(input){ //input focus text function
  var originalvalue = input.val();
  input.focus( function(){
    if( $.trim(input.val()) == originalvalue ){ input.val(''); }
  });
  input.blur( function(){
    if( $.trim(input.val()) == '' ){ input.val(originalvalue); }
  });
}

3. 在新窗口中打开链接
XHTML 1.0 Strict doesn't allow this attribute in the code, so use this to keep the code valid.

$(document).ready(function() {
  //Example 1: Every link will open in a new window
  $('a[href^="http://"]').attr("target", "_blank");
 
  //Example 2: Links with the rel="external" attribute will only open in a new window
  $('a[@rel$='external']').click(function(){
   this.target = "_blank";
  });
});
// how to use
<A href="http://www.opensourcehunter.com" rel=external>open link</A>

4. 检测浏览器
注: 在版本jQuery 1.4中，$.support 替换掉了$.browser 变量

$(document).ready(function() {
// Target Firefox 2 and above
if ($.browser.mozilla && $.browser.version >= "1.8" ){
  // do something
}
 
// Target Safari
if( $.browser.safari ){
  // do something
}
 
// Target Chrome
if( $.browser.chrome){
  // do something
}
 
// Target Camino
if( $.browser.camino){
  // do something
}
 
// Target Opera
if( $.browser.opera){
  // do something
}
 
// Target IE6 and below
if ($.browser.msie && $.browser.version <= 6 ){
  // do something
}
 
// Target anything above IE6
if ($.browser.msie && $.browser.version > 6){
  // do something
}
});

5. 预加载图片
This piece of code will prevent the loading of all images, which can be useful if you have a site with lots of images.

$(document).ready(function() {
jQuery.preloadImages = function()
{
 for(var i = 0; i<ARGUMENTS.LENGTH; jQuery(?<img { i++)>").attr("src", arguments[i]);
 }
}
// how to use
$.preloadImages("image1.jpg");
});

6. 页面样式切换

$(document).ready(function() {
  $("a.Styleswitcher").click(function() {
    //swicth the LINK REL attribute with the value in A REL attribute
    $('link[rel=stylesheet]').attr('href' , $(this).attr('rel'));
  });
// how to use
// place this in your header
<LINK rel=stylesheet type=text/css href="default.css">
// the links
<A class="Styleswitcher" href="#" rel=default.css>Default Theme</A>
<A class="Styleswitcher" href="#" rel=red.css>Red Theme</A>
<A class="Styleswitcher" href="#" rel=blue.css>Blue Theme</A>
});

7. 列高度相同
如果使用了两个CSS列，使用此种方式可以是两列的高度相同。

$(document).ready(function() {
function equalHeight(group) {
  tallest = 0;
  group.each(function() {
    thisHeight = $(this).height();
    if(thisHeight > tallest) {
      tallest = thisHeight;
    }
  });
  group.height(tallest);
}
// how to use
$(document).ready(function() {
  equalHeight($(".left"));
  equalHeight($(".right"));
});
});

8. 动态控制页面字体大小
用户可以改变页面字体大小

$(document).ready(function() {
 // Reset the font size(back to default)
 var originalFontSize = $('html').css('font-size');
  $(".resetFont").click(function(){
  $('html').css('font-size', originalFontSize);
 });
 // Increase the font size(bigger font0
 $(".increaseFont").click(function(){
  var currentFontSize = $('html').css('font-size');
  var currentFontSizeNum = parseFloat(currentFontSize, 10);
  var newFontSize = currentFontSizeNum*1.2;
  $('html').css('font-size', newFontSize);
  return false;
 });
 // Decrease the font size(smaller font)
 $(".decreaseFont").click(function(){
  var currentFontSize = $('html').css('font-size');
  var currentFontSizeNum = parseFloat(currentFontSize, 10);
  var newFontSize = currentFontSizeNum*0.8;
  $('html').css('font-size', newFontSize);
  return false;
 });
});

9. 返回页面顶部功能
For a smooth(animated) ride back to the top(or any location).

$(document).ready(function() {
$('a[href*=#]').click(function() {
 if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')
 && location.hostname == this.hostname) {
  var $target = $(this.hash);
  $target = $target.length && $target
  || $('[name=' + this.hash.slice(1) +']');
  if ($target.length) {
 var targetOffset = $target.offset().top;
 $('html,body')
 .animate({scrollTop: targetOffset}, 900);
  return false;
  }
 }
 });
// how to use
// place this where you want to scroll to
<A name=top></A>
// the link
<A href="#top">go to top</A>
});

11. 获得鼠标指针ＸＹ值
Want to know where your mouse cursor is?

$(document).ready(function() {
  $().mousemove(function(e){
   //display the x and y axis values inside the div with the id XY
  $('#XY').html("X Axis : " + e.pageX + " | Y Axis " + e.pageY);
 });
// how to use
<DIV id=XY></DIV>
 
});

12. 验证元素是否为空
This will allow you to check if an element is empty.

$(document).ready(function() {
 if ($('#id').html()) {
  // do something
  }
});

13. 替换元素
Want to replace a div, or something else?

$(document).ready(function() {
  $('#id').replaceWith('
<DIV>I have been replaced</DIV>
 
');
});

14. jQuery延时加载功能
Want to delay something?

$(document).ready(function() {
  window.setTimeout(function() {
   // do something
  }, 1000);
});

15. 移除单词功能
Want to remove a certain word(s)?

$(document).ready(function() {
  var el = $('#id');
  el.html(el.html().replace(/word/ig, ""));
});

16. 验证元素是否存在于jquery对象集合中
Simply test with the .length property if the element exists.

$(document).ready(function() {
  if ($('#id').length) {
 // do something
 }
});

17. 使整个DIV可点击
Want to make the complete div clickable?

$(document).ready(function() {
  $("div").click(function(){
   //get the url from href attribute and launch the url
   window.location=$(this).find("a").attr("href"); return false;
  });
// how to use
<DIV><A href="index.html">home</A></DIV>
 
});

18. ID与Class之间转换.
当改变Window大小时，在ID与Class之间切换

$(document).ready(function() {
  function checkWindowSize() {
  if ( $(window).width() > 1200 ) {
    $('body').addClass('large');
  }
  else {
    $('body').removeClass('large');
  }
  }
$(window).resize(checkWindowSize);
});

19. 克隆对象
Clone a div or an other element.

$(document).ready(function() {
  var cloned = $('#id').clone();
// how to use
<DIV id=id></DIV>
 
});

20. 使元素居屏幕中间位置
Center an element in the center of your screen.

$(document).ready(function() {
 jQuery.fn.center = function () {
   this.css("position","absolute");
   this.css("top", ( $(window).height() - this.height() ) / 2+$(window).scrollTop() + "px");
   this.css("left", ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + "px");
   return this;
 }
 $("#id").center();
});

21. 写自己的选择器
Write your own selectors.

$(document).ready(function() {
  $.extend($.expr[':'], {
    moreThen1000px: function(a) {
      return $(a).width() > 1000;
   }
  });
 $('.box:moreThen1000px').click(function() {
   // creating a simple js alert box
   alert('The element that you have clicked is over 1000 pixels wide');
 });
});

22. 统计元素个数
Count an element.

$(document).ready(function() {
  $("p").size();
});

23. 使用自己的 Bullets
Want to use your own bullets instead of using the standard or images bullets?

$(document).ready(function() {
  $("ul").addClass("Replaced");
  $("ul > li").prepend("‒ ");
 // how to use
 ul.Replaced { list-style : none; }
});

24. 引用Google主机上的Jquery类库
Let Google host the jQuery script for you. This can be done in 2 ways.

[code]//Example 1
<SCRIPT src="http://www.google.com/jsapi"></SCRIPT>
<SCRIPT type=text/javascript>
google.load("jquery", "1.2.6");
google.setOnLoadCallback(function() {
    // do something
});
</SCRIPT><SCRIPT type=text/javascript src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>
 
 // Example 2:(the best and fastest way)
<SCRIPT type=text/javascript src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>[/code]

25. 禁用Jquery（动画）效果
Disable all jQuery effects

$(document).ready(function() {
  jQuery.fx.off = true;
});

26. 与其他Javascript类库冲突解决方案
To avoid conflict other libraries on your website, you can use this jQuery Method, and assign a different variable name instead of the dollar sign.

$(document).ready(function() {
  var $jq = jQuery.noConflict();
  $jq('#id').show();
});