26個Jquery使用小技巧(jQuery tips, tricks & solutions)

前段時間發布了Jquery類庫1.4版本，使用者也越來越多，為了方便大家對Jquery的使用，下面列出了一些Jquery使用技巧。比如有禁止右鍵點擊、隱藏搜索文本框文字、在新窗口中打開鏈接、檢測瀏覽器、預加載圖片、頁面樣式切換、所有列等高、動態控制頁面字體大小、獲得鼠標指針的X值Y值、驗證元素是否為空、替換元素、延遲加載、驗證元素是否存在于Jquery集合中、使DIV可點擊、克隆對象、使元素居中、計算元素個數、使用Google主機上的Jquery類庫、禁用Jquery效果、解決Jquery類庫與其他Javascript類庫沖突問題。

具體如下：

1. 禁止右鍵點擊
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1. $(document).ready(function(){

2. $(document).bind("contextmenu",function(e){

3. return false;

4. });

5. });

2. 隱藏搜索文本框文字view plaincopy to clipboardprint?

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. 在新窗口中打開鏈接view plaincopy to clipboardprint?

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. 檢測瀏覽器
注: 在版本jQuery 1.4中，$.support 替換掉了$.browser 變量。

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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. 預加載圖片
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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. 頁面樣式切換
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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
如果使用了兩個CSS列，使用此種方式可以是兩列的高度相同。

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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. 動態控制頁面字體大小
用戶可以改變頁面字體大小

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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. 返回頁面頂部功能
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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.獲得鼠標指針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. 驗證元素是否為空
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1. $(document).ready(function() {

2. if ($('#id').html()) {

3. // do something

4. }

5. });

13. 替換元素
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1. $(document).ready(function() {

2. $('#id').replaceWith('

3. <DIV>I have been replaced</DIV>

4.

5. ');

6. });

14. jQuery延時加載功能view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. window.setTimeout(function() {

3. // do something

4. }, 1000);

5. });

15. 移除單詞功能view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. var el = $('#id');

3. el.html(el.html().replace(/word/ig, ""));

4. });

16. 驗證元素是否存在于Ｊｑｕｅｒｙ對象集合中view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. if ($('#id').length) {

3. // do something

4. }

5. });

17. 使整個ＤＩＶ可點擊view plaincopy to clipboardprint?

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與Class之間轉換當改變Window大小時，在ID與Class之間切換

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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. 克隆對象view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. var cloned = $('#id').clone();

3. // how to use

4. <DIV id=id></DIV>

5.

6. });

20. 使元素居屏幕中間位置view plaincopy to clipboardprint?

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. 寫自己的選擇器view plaincopy to clipboardprint?

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. 統計元素個數view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. $("p").size();

3. });

23. 使用自己的 Bulletsview plaincopy to clipboardprint?

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主機上的Jquery類庫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>

25. 禁用Jquery（動畫）效果
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1. $(document).ready(function() {

2. jQuery.fx.off = true;

3. });

26. 與其他Javascript類庫沖突解決方案view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. var $jq = jQuery.noConflict();

3. $jq('#id').show();

4. });