26个有用的Jquery小技巧 tips, tricks & solutions

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. Disable right-click 禁止右键点击

Disable right-click contextual menu.

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

2. Disappearing search field text 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. Opening links in a new window 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 useopen link

4. Detect browser 检测浏览器注

Change/add something for a certain browser.

Notice: As of jQuery 1.4, the $.browser variable is replaced by $.support.
在版本jQuery 1.4中，$.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. Preloading images 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.

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

6. CSS Styleswitcher 页面样式切换

Switch between different styles?

$(document).ready(function() {$("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// the linksDefault ThemeRed ThemeBlue Theme});

7. Columns of equal height

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。
If you are using two CSS columns, use this to make them exactly the same height.

$(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. Font resizing

Want to let the users change there font size?

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. Smooth(animated) page scroll

For a smooth(animated) ride back to the top(or any location).

返回页面顶部功能

$(document).ready(function() {$('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// the linkgo to top});

11. Get the mouse cursor x and y axis

Want to know where your mouse cursor is?

获得鼠标指针ＸＹ坐标

$(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});

12. Verify if an Element is empty

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. Replace a element

替换元素

Want to replace a div, or something else?

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

14. jQuery timer callback functions

Want to delay something?

jQuery延时加载功能

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

15. Remove a word

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. Verify that an element exists in jQuery

Simply test with the .length property if the element exists.

验证元素是否存在于Ｊｑｕｅｒｙ对象集合中

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

17. Make the entire DIV clickable

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});

18. Switch between classes or id’s when resizing the window.

ID与Class之间转换当改变Window大小时，在ID与Class之间切换
Want to switch between a class or id, when resizing the window?

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

19. Clone a object

Clone a div or an other element.

克隆对象

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

20. Center an element on the screen

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. Write our own selector

写一个自己的选择器

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. Count a element

统计元素个数

Count an element.

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

23. Use Your Own Bullets

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. Let Google host jQuery for you

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.

 

//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>  

25. Disable jQuery animations

禁用Jquery（动画）效果

Disable all jQuery effects

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

26. No conflict-mode

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();});