26个有用的Jquery小技巧 tips, tricks & solutions

钦楚青

2023-12-01

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. Disable right-click 禁止右键点击

Disable right-click contextual menu.

$(document).ready(function(){
    $(document).bind("contextmenu",function(e){
        return false;
    });
});

2. Disappearing search field text 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. Opening links in a new window 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
open link

4. Detect browser 检测浏览器注

Change/add something for a certain browser.

Notice: As of jQuery 1.4, the $.browser variable is replaced by $.support.
在版本jQuery 1.4中，$.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. Preloading images 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").attr("src", arguments[i]);
  }
}
// how to use
$.preloadImages("image1.jpg");
});

6. CSS Styleswitcher 页面样式切换

Switch between different styles?

$(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

// the links
Default Theme
Red Theme
Blue Theme
});

7. Columns of equal height

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。
If you are using two CSS columns, use this to make them exactly the same height.

$(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. Font resizing

Want to let the users change there font size?

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. Smooth(animated) page scroll

For a smooth(animated) ride back to the top(or any location).

返回页面顶部功能

$(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

// the link
go to top
});

11. Get the mouse cursor x and y axis

Want to know where your mouse cursor is?

获得鼠标指针ＸＹ坐标

$(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


});

12. Verify if an Element is empty

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. Replace a element

替换元素

Want to replace a div, or something else?

$(document).ready(function() {
   $('#id').replaceWith('

  
  
   
   I have been replaced
  
  

');
});

14. jQuery timer callback functions

Want to delay something?

jQuery延时加载功能

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

15. Remove a word

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. Verify that an element exists in jQuery

Simply test with the .length property if the element exists.

验证元素是否存在于Ｊｑｕｅｒｙ对象集合中

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

17. Make the entire DIV clickable

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
});

18. Switch between classes or id’s when resizing the window.

ID与Class之间转换当改变Window大小时，在ID与Class之间切换
Want to switch between a class or id, when resizing the window?

$(document).ready(function() {
   function checkWindowSize() {
	if ( $(window).width() > 1200 ) {
		$('body').addClass('large');
	}
	else {
		$('body').removeClass('large');
	}
   }
$(window).resize(checkWindowSize);
});

19. Clone a object

Clone a div or an other element.

克隆对象

$(document).ready(function() {
   var cloned = $('#id').clone();
// how to use


});

20. Center an element on the screen

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. Write our own selector

写一个自己的选择器

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. Count a element

统计元素个数

Count an element.

$(document).ready(function() {
   $("p").size();
});

23. Use Your Own Bullets

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. Let Google host jQuery for you

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

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)

25. Disable jQuery animations

禁用Jquery（动画）效果

Disable all jQuery effects

$(document).ready(function() {
    jQuery.fx.off = true;
});

26. No conflict-mode

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();
});