zoukankan      html  css  js  c++  java
  • 10 awesome jQuery snippets

    jQuery gave a new life to JavaScript coding. Thanks to this great tool, it is now possible to build powerful and responsive web pages. In this article, I have compiled 10 jQuery snippets that will definitely help you in your daily client-side coding.

    Preloading images

    Preloading images is useful: Instead of loading an image when the user request it, we preload them in the background so they are ready to be displayed. Doing so in jQuery is very simple, as shown below:

    (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");
    
    

    → Source: http://engineeredweb.com/blog/09/12/preloading-images-jquery-and-javascript

    target=”blank” links

    The following snippet will open all links with the rel="external" attribute in a new tab/window. The code can be easily customized to only open links with a specific class.

    $('a[@rel$='external']').click(function(){
    this.target = "_blank";
    });

    /*
    Usage:
    <a href="http://www.catswhocode.com" rel="external">catswhocode.com</a>
    */
    
    

    → Source: http://snipplr.com/view/315/-jquery–target-blank-links/

    Add a class to the <body> tag if JavaScript is enabled

    This snippet is just a line of code, but it is one of the easiest way to detect if JavaScript is enabled on the client browser. If yes, a hasJS class will be added to the <body> tag.

    $('body').addClass('hasJS');
    
    

    → Source: http://eisabainyo.net/weblog/2010/09/01/10-useful-jquery-snippets/

    Smooth scrolling to an anchor

    jQuery is known for its ability to let developers easily create stunning visual effects. A simple, but nice effect is smooth sliding to an anchor. The following snippet will create a smooth sliding effect when a link with the topLinkclass is clicked.

    $(document).ready(function() {
    $("a.topLink").click(function() {
    $("html, body").animate({
    scrollTop: $($(this).attr("href")).offset().top + "px"
    }, {
    duration: 500,
    easing: "swing"
    });
    return false;
    });
    });
    
    

    → Source: http://snipplr.com/view.php?codeview&id=26739

    Fade in/out on hover

    Another very cool effect – which is very popular among clients – is indeed the fade in/fade out on mouseover. The code below set opacity to 100% on hover, and to 60% on mouseout.

    $(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
    });
    });
    
    

    → Source: http://snipplr.com/view/18606/

    Equal column height

    When building a column based website, you often want that all columns have the same height, as displayed in a good old table. This snippet calculate the height of the higher column and automatically adjust all other columns to this height.

    var max_height = 0;
    $("div.col").each(function(){
    if ($(this).height() > max_height) { max_height = $(this).height(); }
    });
    $("div.col").height(max_height);
    
    

    → Source: http://web.enavu.com/tutorials/top-10-jquery-snippets-including-jquery-1-4/

    Enable HTML5 markup on older browsers

    HTML5 is definitely the future of client-side web development. Unfortunely, some old browsers do not even recognize new tags such as header or section. This code will force old browsers to recognize the new tags introduced by HTML5.

    (function(){if(!/*@cc_on!@*/0)return;var e = "abbr,article,aside,audio,bb,canvas,datagrid,datalist,details,dialog,eventsource,figure,footer,header,hgroup,mark,menu,meter,nav,output,progress,section,time,video".split(','),i=e.length;while(i--){document.createElement(e[i])}})()
    
    

    A better solution is to link the .js file to the <head> part of your HTML page:

    <!--[if lt IE 9]>
    <script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
    <![endif]-->
    
    

    → Source: http://remysharp.com/2009/01/07/html5-enabling-script/

    Test if the browser supports a specific CSS3 property

    Here is a simple jQuery function to check if the client browser supports a specific CSS3 property. In this example,border-radius is the property we want to check, but of course this can be modified easily.

    Note that when passing the property, you have to omit the dash to prevent syntax error. So instead of border-radius, you have to pass “borderRadius” or “BorderRadius”.

    var supports = (function() {
    var div = document.createElement('div'),
    vendors = 'Khtml Ms O Moz Webkit'.split(' '),
    len = vendors.length;

    return function(prop) {
    if ( prop in div.style ) return true;

    prop = prop.replace(/^[a-z]/, function(val) {
    return val.toUpperCase();
    });

    while(len--) {
    if ( vendors[len] + prop in div.style ) {
    // browser supports box-shadow. Do what you need.
    // Or use a bang (!) to test if the browser doesn't.
    return true;
    }
    }
    return false;
    };
    })();

    if ( supports('textShadow') ) {
    document.documentElement.className += ' textShadow';
    
    

    → Source: http://snipplr.com/view/44079

    Get url parameters

    Getting url parameters is pretty easy using jQuery. The following snippet will do the job!

    $.urlParam = function(name){
    var results = new RegExp('[\\?&]' + name + '=([^&#]*)').exec(window.location.href);
    if (!results) { return 0; }
    return results[1] || 0;
    }
    
    

    → Source: http://snipplr.com/view/26662

    Disable the “Enter” key in forms

    By default, a form can be submitted by pressing the “Enter” key. Thought, on some form, this keyboard shortcut can cause problems. Here is how you can prevent unwanted form submission by disabling the “Enter” key with jQuery.

    $("#form").keypress(function(e) {
    if (e.which == 13) {
    return false;
    }
    });
    
    

    → Source: http://snipplr.com/view/10943/disable-enter-via-jquery/


    转:http://www.dzone.com/links/r/10_awesome_jquery_snippets.html

  • 相关阅读:
    HDU 4436 str2int (后缀自动机SAM,多串建立)
    HDU 4498 Function Curve (自适应simpson)
    PHP实现微信商户支付企业付款到零钱功能代码实例
    微信支付现金红包接口应用实例代码说明和DEMO详解,适合用来做微信红包营销活动、吸粉利器
    java开发学生信息管理系统的实现(简洁易懂),适合计算机专业学生参考,课程设计、毕业论文设计参考等
    公司注册经营范围大全
    《胡雪岩》影评10篇
    提高淘宝店铺动态评分的四大技巧
    为什么我的淘宝店铺动态评分清零了?
    CC攻击原理及防范方法和如何防范CC攻击
  • 原文地址:https://www.cnblogs.com/shuaixf/p/2260716.html
Copyright © 2011-2022 走看看