前段时间发布了 Jquery 类库 1.4 版本，使用者也越来越多，为了方便大家对 Jquery 的使用，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。
具体如下：
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1. $(document).ready( function (){
2. $(document).bind( "contextmenu" , function (e){
3. return false ;
4. });
5. });
2. 隐藏搜索文本框文字view plain copy to clipboard print ?
1. $(document).ready( function () {
2. $( "input.text1" ).val( "Enter your search text here" );
3. textFill($( 'input.text1' ));
4. });
5.
6. function textFill(input){ //input focus text function
7. var originalvalue = input.val();
8. input.focus( function (){
9. if ( $.trim(input.val()) == originalvalue ){ input.val( '' ); }
10. });
11. input.blur( function (){
12. if ( $.trim(input.val()) == '' ){ input.val(originalvalue); }
13. });
14. }
3. 在新窗口中打开链接view plain copy to clipboard print ?
1. $(document).ready( function () {
2. //Example 1: Every link will open in a new window
3. $( 'a[href^="http://"]' ).attr( "target" , "_blank" );
4.
5. //Example 2: Links with the rel="external" attribute will only open in a new window
6. $( 'a[@rel$=' external ']' ).click( function (){
7. this .target = "_blank" ;
8. });
9. });
10. // how to use
11. <A href= "http://www.opensourcehunter.com" rel=external>open link</A>
注: 在版本jQuery 1.4 中，$.support 替换掉了$.browser 变量。
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1. $(document).ready( function () {
2. // Target Firefox 2 and above
3. if ($.browser.mozilla && $.browser.version >= "1.8" ){
4. // do something
5. }
6.
7. // Target Safari
8. if ( $.browser.safari ){
9. // do something
10. }
11.
12. // Target Chrome
13. if ( $.browser.chrome){
14. // do something
15. }
16.
17. // Target Camino
18. if ( $.browser.camino){
19. // do something
20. }
21.
22. // Target Opera
23. if ( $.browser.opera){
24. // do something
25. }
26.
27. // Target IE6 and below
28. if ($.browser.msie && $.browser.version <= 6 ){
29. // do something
30. }
31.
32. // Target anything above IE6
33. if ($.browser.msie && $.browser.version > 6){
34. // do something
35. }
36. });
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1. $(document).ready( function () {
2. jQuery.preloadImages = function ()
3. {
4. for ( var i = 0; i ").attr(" src ", arguments[i]);
5. }
6. };
7. // how to use
8. $.preloadImages(" image1.jpg");
9. });
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1. $(document).ready( function () {
2. $( "a.Styleswitcher" ).click( function () {
3. //swicth the LINK REL attribute with the value in A REL attribute
4. $( 'link[rel=stylesheet]' ).attr( 'href' , $( this ).attr( 'rel' ));
5. });
6. // how to use
7. // place this in your header
8. <LINK href= "default.css" type=text/css rel=stylesheet>
9. // the links
10. <A class =Styleswitcher href= "#" rel= default .css>Default Theme</A>
11. <A class =Styleswitcher href= "#" rel=red.css>Red Theme</A>
12. <A class =Styleswitcher href= "#" rel=blue.css>Blue Theme</A>
13. });
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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1. $(document).ready( function () {
2. function equalHeight(group) {
3. tallest = 0;
4. group.each( function () {
5. thisHeight = $( this ).height();
6. if (thisHeight > tallest) {
7. tallest = thisHeight;
8. }
9. });
10. group.height(tallest);
11. }
12. // how to use
13. $(document).ready( function () {
14. equalHeight($( ".left" ));
15. equalHeight($( ".right" ));
16. });
17. });
用户可以改变页面字体大小
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1. $(document).ready( function () {
2. // Reset the font size(back to default)
3. var originalFontSize = $( 'html' ).css( 'font-size' );
4. $( ".resetFont" ).click( function (){
5. $( 'html' ).css( 'font-size' , originalFontSize);
6. });
7. // Increase the font size(bigger font0
8. $( ".increaseFont" ).click( function (){
9. var currentFontSize = $( 'html' ).css( 'font-size' );
10. var currentFontSizeNum = parseFloat(currentFontSize, 10);
11. var newFontSize = currentFontSizeNum*1.2;
12. $( 'html' ).css( 'font-size' , newFontSize);
13. return false ;
14. });
15. // Decrease the font size(smaller font)
16. $( ".decreaseFont" ).click( function (){
17. var currentFontSize = $( 'html' ).css( 'font-size' );
18. var currentFontSizeNum = parseFloat(currentFontSize, 10);
19. var newFontSize = currentFontSizeNum*0.8;
20. $( 'html' ).css( 'font-size' , newFontSize);
21. return false ;
22. });
23. });
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1. $(document).ready( function () {
2. $( 'a[href*=#]' ).click( function () {
3. if (location.pathname.replace(/^/ //,'') == this.pathname.replace(/^///,'')
4. && location.hostname == this .hostname) {
5. var $target = $( this .hash);
6. $target = $target.length && $target
7. || $( '[name=' + this .hash.slice(1) + ']' );
8. if ($target.length) {
9. var targetOffset = $target.offset().top;
10. $( 'html,body' )
11. .animate({scrollTop: targetOffset}, 900);
12. return false ;
13. }
14. }
15. });
16. // how to use
17. // place this where you want to scroll to
18. <A name=top></A>
19. // the link
20. <A href= "#top" >go to top</A>
21. });
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1. $(document).ready( function () {
2. $().mousemove( function (e){
3. //display the x and y axis values inside the div with the id XY
4. $( '#XY' ).html( "X Axis : " + e.pageX + " | Y Axis " + e.pageY);
5. });
6. // how to use
7. <DIV id=XY></DIV>
8.
9. });
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1. $(document).ready( function () {
2. if ($( '#id' ).html()) {
3. // do something
4. }
5. });
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1. $(document).ready( function () {
2. $( '#id' ).replaceWith( '
3. <DIV>I have been replaced</DIV>
4.
5. ' );
6. });
14. jQuery 延时加载功能view plain copy to clipboard print ?
1. $(document).ready( function () {
2. window.setTimeout( function () {
3. // do something
4. }, 1000);
5. });
15. 移除单词功能view plain copy to clipboard print ?
1. $(document).ready( function () {
2. var el = $( '#id' );
3. el.html(el.html().replace(/word/ig, "" ));
4. });
16. 验证元素是否存在于Ｊｑｕｅｒｙ对象集合中view plain copy to clipboard print ?
1. $(document).ready( function () {
2. if ($( '#id' ).length) {
3. // do something
4. }
5. });
17. 使整个ＤＩＶ可点击view plain copy to clipboard print ?
1. $(document).ready( function () {
2. $( "div" ).click( function (){
3. //get the url from href attribute and launch the url
4. window.location=$( this ).find( "a" ).attr( "href" ); return false ;
5. });
6. // how to use
7. <DIV><A href= "index.html" >home</A></DIV>
8.
9. });
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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1. $(document).ready( function () {
2. function checkWindowSize() {
3. if ( $(window).width() > 1200 ) {
4. $( 'body' ).addClass( 'large' );
5. }
6. else {
7. $( 'body' ).removeClass( 'large' );
8. }
9. }
10. $(window).resize(checkWindowSize);
11. });
19. 克隆对象view plain copy to clipboard print ?
1. $(document).ready( function () {
2. var cloned = $( '#id' ).clone();
3. // how to use
4. <DIV id=id></DIV>
5.
6. });
20. 使元素居屏幕中间位置view plain copy to clipboard print ?
1. $(document).ready( function () {
2. jQuery.fn.center = function () {
3. this .css( "position" , "absolute" );
4. this .css( "top" , ( $(window).height() - this .height() ) / 2+$(window).scrollTop() + "px" );
5. this .css( "left" , ( $(window).width() - this .width() ) / 2+$(window).scrollLeft() + "px" );
6. return this ;
7. }
8. $( "#id" ).center();
9. });
21. 写自己的选择器view plain copy to clipboard print ?
1. $(document).ready( function () {
2. $.extend($.expr[ ':' ], {
3. moreThen1000px: function (a) {
4. return $(a).width() > 1000;
5. }
6. });
7. $( '.box:moreThen1000px' ).click( function () {
8. // creating a simple js alert box
9. alert( 'The element that you have clicked is over 1000 pixels wide' );
10. });
11. });
22. 统计元素个数view plain copy to clipboard print ?
1. $(document).ready( function () {
2. $( "p" ).size();
3. });
23. 使用自己的 Bulletsview plain copy to clipboard print ?
1. $(document).ready( function () {
2. $( "ul" ).addClass( "Replaced" );
3. $( "ul > li" ).prepend( " ‒ " );
4. // how to use
5. ul.Replaced { list-style : none; }
6. });
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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1. //Example 1
2. <SCRIPT src= "http://www.google.com/jsapi" ></SCRIPT>
3. <SCRIPT type=text/javascript>
4. google.load( "jquery" , "1.2.6" );
5. google.setOnLoadCallback( function () {
6. // do something
7. });
8. </SCRIPT><SCRIPT src= "http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" type=text/javascript></SCRIPT>
9.
10. // Example 2:(the best and fastest way)
11. <SCRIPT src= "http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" type=text/javascript></SCRIPT>
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1. $(document).ready( function () {
2. jQuery.fx.off = true ;
3. });
26. 与其他 Javascript 类库冲突解决方案view plain copy to clipboard print ?
1. $(document).ready( function () {
2. var $jq = jQuery.noConflict();
3. $jq( '#id' ).show();
4. });
英文地址：
http://www.opensourcehunter.com/2010/02/27/26-cool-and-usefull-jquery-tips-tricks-solutions/版权
作者：灵动生活
出处：http://www.cnblogs.com/ywqu/archive/2010/03/01/1675355.html
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