26个Jquery使用小技巧 二
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：
1. 禁止右键点击
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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
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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
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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>
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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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. });
5. 预加载图片
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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. });
6. 页面样式切换
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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. });
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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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. });
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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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. });
9. 返回页面顶部功能
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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. });
11.获得鼠标指针ＸＹ值
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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. });
12. 验证元素是否为空
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1. $(document).ready(function() {
2. if ($('#id').html()) {
3. // do something
4. }
5. });
13. 替换元素
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1. $(document).ready(function() {
2. $('#id').replaceWith('
3. <DIV>I have been replaced</DIV>
4.
5. ');
6. });
转载自http://blog.163.com/niuzai369@126/blog/static/3743091520103205143627/，感谢生活因拼搏而精彩的分享。
