很棒的jQuery代码片段分享

　jQuery实现的内链接平滑滚动

　　不需要使用太复杂的插件，只要使用下载这段代码即可实现基于内部链接的平滑滚动

$('a[href^="#"]').bind('click.smoothscroll',function (e) {

e.preventDefault();

 

var anchor = this.hash,

$target = $(target);

 

$('html, body').stop().animate({

'scrollTop': $target.offset().top

}, 500, 'swing', function () {

window.location.hash = anchor;

});

 

});

使用jQuery获取所有节点

var $element = $('#gbtags');

    var $nodes = $element.contents();

    $nodes.each(function() {

        if(this.nodeType === 3 && $.trim($(this).text())) {

        $(this).wrap('');

    }

});

限制选择框选择个数

$("#categories option").click(function(e){

    if ($(this).parent().val().length < 2) {

        $(this).removeAttr("selected");

    }

});

jQuery使用通配符来删除class

var _c = 'your-icon-class'

  

$('.currency').removeClass (function (index, css) {

    return (css.match (/icon-S+/g) || []).join(' ');

}).addClass('icon-'+_c);

切换启用和禁用

/* HTML

|

|

<input type="text" value="欢迎访问www.admin10000.com" /><input type="button" value="禁用按钮" />

|

|

*/

 

// Plugin

(function ($) {

    $.fn.toggleDisabled = function () {

        return this.each(function () {

            var $this = $(this);

            if ($this.attr('disabled')) $this.removeAttr('disabled');

            else $this.attr('disabled', 'disabled');

        });

    };

})(jQuery);

 

// TEST

$(function () {

    $('input:button').click(function () {

        $('input:text').toggleDisabled();

    });

});

平滑滚动返回顶端

<h1 id="anchor">admin10000.com</h1>

<a class="topLink" href="#anchor">返回顶端</a>

 

$(document).ready(function () {

 

    $("a.topLink").click(function () {

        $("html, body").animate({

            scrollTop: $($(this).attr("href")).offset().top + "px"

        }, {

            duration: 500,

            easing: "swing"

        });

        return false;

    });

 

});

使用jQuery和Google Analytics来跟踪表单

var array1 = [];

$(document).ready(function () {

    $('input').change(function () {

        var formbox = $(this).attr('id');

        array1.push(formbox);

        console.log("you filled out box " + array1);

    });

    $('#submit').click(function () {

        console.log('tracked ' + array1);

        //alert('this is the order of boxes you filled out: ' + array1);

        _gaq.push(['_trackEvent', 'Form', 'completed', '"' + array1 + '"']);

    });

});

超简单的密码强度提示

$('#pass').keyup(function (e) {

    var strongRegex = new RegExp("^(?=.{8,})(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*W).*$", "g");

    var mediumRegex = new RegExp("^(?=.{7,})(((?=.*[A-Z])(?=.*[a-z]))|((?=.*[A-Z])(?=.*[0-9]))|((?=.*[a-z])(?=.*[0-9]))).*$", "g");

    var enoughRegex = new RegExp("(?=.{6,}).*", "g");

    if (false == enoughRegex.test($(this).val())) {

        $('#passstrength').html('More Characters');

    } else if (strongRegex.test($(this).val())) {

        $('#passstrength').className = 'ok';

        $('#passstrength').html('Strong!');

    } else if (mediumRegex.test($(this).val())) {

        $('#passstrength').className = 'alert';

        $('#passstrength').html('Medium!');

    } else {

        $('#passstrength').className = 'error';

        $('#passstrength').html('Weak!');

    }

    return true;

});

jQuery生成一个自动停靠页尾效果

// Window load event used just in case window height is dependant upon images

$(window).bind("load", function () {

    var footerHeight = 0,

        footerTop = 0,

        $footer = $("#footer");

    positionFooter();

 

    function positionFooter() {

        footerHeight = $footer.height();

        footerTop = ($(window).scrollTop() + $(window).height() - footerHeight) + "px";

        /* DEBUGGING

console.log("Document height: ", $(document.body).height());

console.log("Window height: ", $(window).height());

console.log("Window scroll: ", $(window).scrollTop());

console.log("Footer height: ", footerHeight);

console.log("Footer top: ", footerTop);

*/

        if (($(document.body).height() + footerHeight) < $(window).height()) {

            $footer.css({

                position: "absolute"

            }).stop().animate({

                top: footerTop

            });

        } else {

            $footer.css({

                position: "static"

            });

        }

    }

 

    $(window)

        .scroll(positionFooter)

        .resize(positionFooter);

});

预防对表单进行多次提交

$(document).ready(function() {

  $('form').submit(function() {

    if(typeof jQuery.data(this, "disabledOnSubmit") == 'undefined') {

      jQuery.data(this, "disabledOnSubmit", { submited: true });

      $('input[type=submit], input[type=button]', this).each(function() {

        $(this).attr("disabled", "disabled");

      });

      return true;

    }

    else

    {

      return false;

    }

  });

});

图像等比例缩放

$(window).bind("load", function() {

     

// IMAGE RESIZE

    $('#product_cat_list img').each(function() {

        var maxWidth = 120;

        var maxHeight = 120;

        var ratio = 0;

        var width = $(this).width();

        var height = $(this).height();

        if(width > maxWidth){

            ratio = maxWidth / width;

            $(this).css("width", maxWidth);

            $(this).css("height", height * ratio);

            height = height * ratio;

        }

        var width = $(this).width();

        var height = $(this).height();

        if(height > maxHeight){

            ratio = maxHeight / height;

            $(this).css("height", maxHeight);

            $(this).css("width", width * ratio);

            width = width * ratio;

        }

    });

     

//$("#contentpage img").show();

     

// IMAGE RESIZE

});

鼠标滑动时的渐入和渐出

$(document).ready(function(){

    $(".thumbs img").fadeTo("slow", 0.6); // This sets the opacity of the thumbs to fade down to 60% when the page loads

 

    $(".thumbs img").hover(function(){

        $(this).fadeTo("slow", 1.0); // This should set the opacity to 100% on hover

    },function(){

        $(this).fadeTo("slow", 0.6); // This should set the opacity back to 60% on mouseout

    });

});

让整个DIV可以被点击

<div class = "myBox" >

    < a href = "http://www.admin10000.com" > admin10000.com < /a>

</div >

 

$(".myBox").click(function(){

    window.location=$(this).find("a").attr("href");

    return false;

});

图片预加载

(function($) {

  var cache = [];

  // Arguments are image paths relative to the current page.

  $.preLoadImages = function() {

    var args_len = arguments.length;

    for (var i = args_len; i--;) {

      var cacheImage = document.createElement('img');

      cacheImage.src = arguments[i];

      cache.push(cacheImage);

    }

  }

 

jQuery.preLoadImages("image1.gif", "/path/to/image2.png");

获取 URL 中传递的参数

$.urlParam = function(name){

    var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);

    if (!results) { return 0; }

    return results[1] || 0;

}

禁用表单的回车键提交

$("#form").keypress(function(e) {

  if (e.which == 13) {

    return false;

  }

});