jQuery 1.4实用技巧

$(document).ready(function(){
$(document).bind("contextmenu",function(e){
return false;
});
});

$(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); }
});
}

$(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>

$(document).ready(function() {
// Target Firefox 2 and above
if ($.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
}
});

$(document).ready(function() {

jQuery.preloadImages = function()
{
for(var i = 0; i").attr("src", arguments[i]);

}
};
// how to use
$.preloadImages("image1.jpg");
});

$(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 href="default.css" type=text/css rel=stylesheet>
// 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>
});

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。
[code]$(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"));

});

});

$(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;
});
});

$(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>
});

$(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>
});

$(document).ready(function() {
if ($('#id').html()) {
// do something
}
});

$(document).ready(function() {
$('#id').replaceWith('
<DIV>I have been replaced</DIV>
);
});

$(document).ready(function() {

window.setTimeout(function() {

// do something

}, 1000);

});

$(document).ready(function() {

var el = $('#id');

el.html(el.html().replace(/word/ig, ""));

});

$(document).ready(function() {

if ($('#id').length) {

// do something

}
});

$(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>
});

ID与Class之间转换当改变Window大小时，在ID与Class之间切换

$(document).ready(function() {

function checkWindowSize() {
if ( $(window).width() > 1200 ) {

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

}
else {

$('body').removeClass('large');

}

}
$(window).resize(checkWindowSize);
});

$(document).ready(function() {

var cloned = $('#id').clone();

// how to use

<DIV idid=id></DIV>
});

$(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();

});

$(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');

});

});

$(document).ready(function() {
$("p").size();
});

$(document).ready(function() {
$("ul").addClass("Replaced");
$("ul > li").prepend("‒ ");
// how to use
ul.Replaced { list-style : none; }

});

//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 src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" type=text/javascript></SCRIPT>

// Example 2:(the best and fastest way)
<SCRIPT src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js" type=text/javascript></SCRIPT>

$(document).ready(function() {

jQuery.fx.off = true;

});

$(document).ready(function() {

var $jq = jQuery.noConflict();

$jq('#id').show();

});