26个Jquery使用小技巧

摘自： http://www.admin10000.com/document/909.html

　　　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);　　　　// 调整窗口大小
});

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.

//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. 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();
});

posted @ 2012-09-21 11:42 oaijuru 阅读(252) 评论(0) 编辑收藏举报

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oaijuru

26个Jquery使用小技巧

1. 禁止右键点击

2. 隐藏搜索文本框文字

3. 在新窗口中打开链接

4. 检测浏览器

5. 预加载图片

6. 页面样式切换

7. 列高度相同

8. 动态控制页面字体大小

9. 返回页面顶部功能

11. 获得鼠标指针ＸＹ值

12. 验证元素是否为空

13. 替换元素

14. jQuery延时加载功能

15. 移除单词功能

16. 验证元素是否存在于jquery对象集合中

17. 使整个DIV可点击

18. ID与Class之间转换.

19. 克隆对象

20. 使元素居屏幕中间位置

21. 写自己的选择器

22. 统计元素个数

23. 使用自己的 Bullets

24. 引用Google主机上的Jquery类库

25. 禁用Jquery（动画）效果

26. 与其他Javascript类库冲突解决方案

公告

5. 预加载图片　　