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可以直接拿来用的15个jQuery代码片段

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开发人员利用jQuery代码不仅能给网站带来各种动画、特效,还会提高网站的用户体验。本文总结了开发者经常使用的15个jQuery代码片段,大家可以直接拿来用。

jQuery里提供了许多创建交互式网站的方法,在开发Web项目时,开发人员应该好好利用jQuery代码,它们不仅能给网站带来各种动画、特效,还会提高网站的用户体验。

本文收集了15段非常实用的jQuery代码片段,你可以直接复制黏贴到代码里,但请开发者注意了,要理解代码再使用哦。下面就让我们一起来享受jQuery代码的魅力之处吧。

1.预加载图片

(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");
源码

2. 让页面中的每个元素都适合在移动设备上展示

var scr = document.createElement('script');scr.setAttribute('src', 'https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js');document.body.appendChild(scr);scr.onload = function(){	$('div').attr('class', '').attr('id', '').css({		'margin' : 0,		'padding' : 0,		'width': '100%',		'clear':'both'	});};
源码

3.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});
源码

4.返回页面顶部

// Back To Top$(document).ready(function(){   $('.top').click(function() {       $(document).scrollTo(0,500);    });}); //Create a link defined with the class .top<a href="#" class="top">Back To Top</a>
源码

5.使用jQuery打造手风琴式的折叠效果

var accordion = {     init: function(){           var $container = $('#accordion');           $container.find('li:not(:first) .details').hide();           $container.find('li:first').addClass('active');           $container.on('click','li a',function(e){                  e.preventDefault();                  var $this = $(this).parents('li');                  if($this.hasClass('active')){                         if($('.details').is(':visible')) {                                $this.find('.details').slideUp();                         } else {                                $this.find('.details').slideDown();                         }                  } else {                         $container.find('li.active .details').slideUp();                         $container.find('li').removeClass('active');                         $this.addClass('active');                         $this.find('.details').slideDown();                  }           });     }};

6.通过预加载图片廊中的上一幅下一幅图片来模仿Facebook的图片展示方式

var nextimage = "/images/some-image.jpg";$(document).ready(function(){window.setTimeout(function(){var img = $("").attr("src", nextimage).load(function(){//all done});}, 100);});

源码

7.使用jQuery和Ajax自动填充选择框

$(function(){$("select#ctlJob").change(function(){$.getJSON("/select.php",{id: $(this).val(), ajax: 'true'}, function(j){var options = '';for (var i = 0; i < j.length; i++) {options += '' + j[i].optionDisplay + '';}$("select#ctlPerson").html(options);})})})
源码

8.自动替换丢失的图片

// Safe Snippet$("img").error(function () {	$(this).unbind("error").attr("src", "missing_image.gif");});// Persistent Snipper$("img").error(function () {	$(this).attr("src", "missing_image.gif");});

源码

9.在鼠标悬停时显示淡入/淡出特效

$(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    });});
源码

10.清空表单数据

function clearForm(form) {  // iterate over all of the inputs for the form  // element that was passed in  $(':input', form).each(function() {    var type = this.type;    var tag = this.tagName.toLowerCase(); // normalize case    // it's ok to reset the value attr of text inputs,    // password inputs, and textareas    if (type == 'text' || type == 'password' || tag == 'textarea')      this.value = "";    // checkboxes and radios need to have their checked state cleared    // but should *not* have their 'value' changed    else if (type == 'checkbox' || type == 'radio')      this.checked = false;    // select elements need to have their 'selectedIndex' property set to -1    // (this works for both single and multiple select elements)    else if (tag == 'select')      this.selectedIndex = -1;  });};
源码

11.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;    }  });});
源码

12.动态添加表单元素

//change event on password1 field to prompt new input$('#password1').change(function() {        //dynamically create new input and insert after password1        $("#password1").append("");});
源码

13.让整个Div可点击

blah blah blah. linkThe following lines of jQuery will make the entire div clickable: $(".myBox").click(function(){ window.location=$(this).find("a").attr("href"); return false; }); 
源码

14.平衡高度或Div元素

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

15. 在窗口滚动时自动加载内容

var loading = false;$(window).scroll(function(){	if((($(window).scrollTop()+$(window).height())+250)>=$(document).height()){		if(loading == false){			loading = true;			$('#loadingbar').css("display","block");			$.get("load.php?start="+$('#loaded_max').val(), function(loaded){				$('body').append(loaded);				$('#loaded_max').val(parseInt($('#loaded_max').val())+50);				$('#loadingbar').css("display","none");				loading = false;			});		}	}});$(document).ready(function() {	$('#loaded_max').val(50);});
来自: codegeekz

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