15个实用的jQuery代码片

(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");

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'
});
};

$(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
});

$(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>

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();
}
});
}
};

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

$(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);
})
})
})

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

$(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
});
});

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;
});
};

$(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;
}
});
});

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

$(".myBox").click(function(){ window.location=$(this).find("a").attr("href"); return false; });

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

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);
});