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  • 26个Jquery使用小技巧

    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();
    });
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  • 原文地址：https://www.cnblogs.com/cxxjohnson/p/4733194.html
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