26个Jquery使用小技巧

原创
2014/10/14 23:40
阅读数 6

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

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$(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)

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$(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.

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$(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

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$(document).ready( function () {
// Target Firefox 2 and above
if ($.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.

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$(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

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$(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。

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$(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

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$(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).

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$(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?

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$(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.

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

13. 替换元素

Want to replace a div, or something else?

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

14. jQuery延时加载功能

Want to delay something?

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

15. 移除单词功能

Want to remove a certain word(s)?

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$(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.

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

17. 使整个DIV可点击

Want to make the complete div clickable?

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$(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

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$(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.

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$(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.

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$(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.

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$(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.

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$(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?

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$(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.

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//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

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$(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.

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

英文原文:26-cool-and-usefull-jquery-tips-tricks-solutions

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