Jquery使用小技巧汇总
下面列出了一些Jquery使用技巧。比如有禁止右键点击、隐藏搜索文本框文字、在新窗口中打开链接、检测浏览器、预加载图片、页面样式切换、所有列等高、动态控制页面字体大小、获得鼠标指针的X值Y值、验证元素是否为空、替换元素、延迟加载、验证元素是否存在于Jquery集合中、使DIV可点击、克隆对象、使元素居中、计算元素个数、使用Google主机上的Jquery类库、禁用Jquery效果、解决Jquery类库与其他Javascript类库冲突问题。
1.禁止右键点击
$(document).ready(function(){
$(document).bind("contextmenu",function(e){
returnfalse;
});
});
2.隐藏搜索文本框文字
Hidewhenclickedinthesearchfield,thevalue.(examplecanbefoundbelowinthecommentfields)
$(document).ready(function(){
$("input.text1").val("Enteryoursearchtexthere");
textFill($('input.text1'));
});
functiontextFill(input){//inputfocustextfunction
varoriginalvalue=input.val();
input.focus(function(){
if($.trim(input.val())==originalvalue){input.val('');}
});
input.blur(function(){
if($.trim(input.val())==''){input.val(originalvalue);}
});
}
3.在新窗口中打开链接
XHTML1.0Strictdoesn'tallowthisattributeinthecode,sousethistokeepthecodevalid.
$(document).ready(function(){
//Example1:Everylinkwillopeninanewwindow
$('a[href^="http://"]').attr("target","_blank");
//Example2:Linkswiththerel="external"attributewillonlyopeninanewwindow
$('a[@rel$='external']').click(function(){
this.target="_blank";
});
});
//howtouse
<Ahref="http://www.opensourcehunter.com"rel=external>openlink</A>
4.检测浏览器
注:在版本jQuery1.4中，$.support替换掉了$.browser变量
$(document).ready(function(){
//TargetFirefox2andabove
if($.browser.mozilla&&$.browser.version>="1.8"){
//dosomething
}
//TargetSafari
if($.browser.safari){
//dosomething
}
//TargetChrome
if($.browser.chrome){
//dosomething
}
//TargetCamino
if($.browser.camino){
//dosomething
}
//TargetOpera
if($.browser.opera){
//dosomething
}
//TargetIE6andbelow
if($.browser.msie&&$.browser.version<=6){
//dosomething
}
//TargetanythingaboveIE6
if($.browser.msie&&$.browser.version>6){
//dosomething
}
});
5.预加载图片
Thispieceofcodewillpreventtheloadingofallimages,whichcanbeusefulifyouhaveasitewithlotsofimages.
$(document).ready(function(){
jQuery.preloadImages=function()
{
for(vari=0;i<ARGUMENTS.LENGTH;jQuery(?<img{i++)>").attr("src",arguments[i]);
}
}
//howtouse
$.preloadImages("image1.jpg");
});
6.页面样式切换
$(document).ready(function(){
$("a.Styleswitcher").click(function(){
//swicththeLINKRELattributewiththevalueinARELattribute
$('link[rel=stylesheet]').attr('href',$(this).attr('rel'));
});
//howtouse
//placethisinyourheader
<LINKrel=stylesheettype=text/csshref="default.css">
//thelinks
<Aclass="Styleswitcher"href="#"rel=default.css>DefaultTheme</A>
<Aclass="Styleswitcher"href="#"rel=red.css>RedTheme</A>
<Aclass="Styleswitcher"href="#"rel=blue.css>BlueTheme</A>
});
7.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。
$(document).ready(function(){
functionequalHeight(group){
tallest=0;
group.each(function(){
thisHeight=$(this).height();
if(thisHeight>tallest){
tallest=thisHeight;
}
});
group.height(tallest);
}
//howtouse
$(document).ready(function(){
equalHeight($(".left"));
equalHeight($(".right"));
});
});
8.动态控制页面字体大小
用户可以改变页面字体大小
$(document).ready(function(){
//Resetthefontsize(backtodefault)
varoriginalFontSize=$('html').css('font-size');
$(".resetFont").click(function(){
$('html').css('font-size',originalFontSize);
});
//Increasethefontsize(biggerfont0
$(".increaseFont").click(function(){
varcurrentFontSize=$('html').css('font-size');
varcurrentFontSizeNum=parseFloat(currentFontSize,10);
varnewFontSize=currentFontSizeNum*1.2;
$('html').css('font-size',newFontSize);
returnfalse;
});
//Decreasethefontsize(smallerfont)
$(".decreaseFont").click(function(){
varcurrentFontSize=$('html').css('font-size');
varcurrentFontSizeNum=parseFloat(currentFontSize,10);
varnewFontSize=currentFontSizeNum*0.8;
$('html').css('font-size',newFontSize);
returnfalse;
});
});
9.返回页面顶部功能
Forasmooth(animated)ridebacktothetop(oranylocation).
$(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($target.length){
vartargetOffset=$target.offset().top;
$('html,body')
.animate({scrollTop:targetOffset},900);
returnfalse;
}
}
});
//howtouse
//placethiswhereyouwanttoscrollto
<Aname=top></A>
//thelink
<Ahref="#top">gototop</A>
});
11.获得鼠标指针ＸＹ值
Wanttoknowwhereyourmousecursoris?
$(document).ready(function(){
$().mousemove(function(e){
//displaythexandyaxisvaluesinsidethedivwiththeidXY
$('#XY').html("XAxis:"+e.pageX+"|YAxis"+e.pageY);
});
//howtouse
<DIVid=XY></DIV>
});
12.验证元素是否为空
Thiswillallowyoutocheckifanelementisempty.
$(document).ready(function(){
if($('#id').html()){
//dosomething
}
});
13.替换元素
Wanttoreplaceadiv,orsomethingelse?
$(document).ready(function(){
$('#id').replaceWith('
<DIV>Ihavebeenreplaced</DIV>
');
});
14.jQuery延时加载功能
Wanttodelaysomething?
$(document).ready(function(){
window.setTimeout(function(){
//dosomething
},1000);
});
15.移除单词功能
Wanttoremoveacertainword(s)?
$(document).ready(function(){
varel=$('#id');
el.html(el.html().replace(/word/ig,""));
});
16.验证元素是否存在于jquery对象集合中
Simplytestwiththe.lengthpropertyiftheelementexists.
$(document).ready(function(){
if($('#id').length){
//dosomething
}
});
17.使整个DIV可点击
Wanttomakethecompletedivclickable?
$(document).ready(function(){
$("div").click(function(){
//gettheurlfromhrefattributeandlaunchtheurl
window.location=$(this).find("a").attr("href");returnfalse;
});
//howtouse
<DIV><Ahref="index.html">home</A></DIV>
});
18.ID与Class之间转换.
当改变Window大小时，在ID与Class之间切换
$(document).ready(function(){
functioncheckWindowSize(){
if($(window).width()>1200){
$('body').addClass('large');
}
else{
$('body').removeClass('large');
}
}
$(window).resize(checkWindowSize);
});
19.克隆对象
Cloneadivoranotherelement.
$(document).ready(function(){
varcloned=$('#id').clone();
//howtouse
<DIVid=id></DIV>
});
20.使元素居屏幕中间位置
Centeranelementinthecenterofyourscreen.
$(document).ready(function(){
jQuery.fn.center=function(){
this.css("position","absolute");
this.css("top",($(window).height()-this.height())/2+$(window).scrollTop()+"px");
this.css("left",($(window).width()-this.width())/2+$(window).scrollLeft()+"px");
returnthis;
}
$("#id").center();
});
21.写自己的选择器
Writeyourownselectors.
$(document).ready(function(){
$.extend($.expr[':'],{
moreThen1000px:function(a){
return$(a).width()>1000;
}
});
$('.box:moreThen1000px').click(function(){
//creatingasimplejsalertbox
alert('Theelementthatyouhaveclickedisover1000pixelswide');
});
});
22.统计元素个数
Countanelement.
$(document).ready(function(){
$("p").size();
});
23.使用自己的Bullets
Wanttouseyourownbulletsinsteadofusingthestandardorimagesbullets?
$(document).ready(function(){
$("ul").addClass("Replaced");
$("ul>li").prepend("‒");
//howtouse
ul.Replaced{list-style:none;}
});
24.引用Google主机上的Jquery类库
LetGooglehostthejQueryscriptforyou.Thiscanbedonein2ways.
[code]//Example1
<SCRIPTsrc="http://www.google.com/jsapi"></SCRIPT>
<SCRIPTtype=text/javascript>
google.load("jquery","1.2.6");
google.setOnLoadCallback(function(){
//dosomething
});
</SCRIPT><SCRIPTtype=text/javascriptsrc="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>
//Example2:(thebestandfastestway)
<SCRIPTtype=text/javascriptsrc="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>[/code]
25.禁用Jquery（动画）效果
DisablealljQueryeffects
$(document).ready(function(){
jQuery.fx.off=true;
});
26.与其他Javascript类库冲突解决方案
Toavoidconflictotherlibrariesonyourwebsite,youcanusethisjQueryMethod,andassignadifferentvariablenameinsteadofthedollarsign.
$(document).ready(function(){
var$jq=jQuery.noConflict();
$jq('#id').show();
});