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英文教程：鼠标悬停（hover）效果_CSS教程_CSS_网页制作_
2021-09-10
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简介 前面一个CSS教程介绍了在网页中利用CSS建立立体表格效果，今天给大家来一篇很不错的鼠标悬停效果，也是用CSS实现的。 这是一个很棒的鼠标悬停（hover）效果。从国外的网站上看到了，转载过来。没有作任何翻译与编辑，大家可以偿试阅读英文教程，加油！ 注意：此
前面一个CSS教程介绍了在网页中利用CSS建立立体表格效果，今天给大家来一篇很不错的鼠标悬停效果，也是用CSS实现的。
这是一个很棒的鼠标悬停（hover）效果。从国外的网站上看到了，转载过来。没有作任何翻译与编辑，大家可以偿试阅读英文教程，加油！
注意：此悬停效果在IE6中无效
实例预览地址：http://www.prukc.com/
IwouldliketosharesomeinsightonapieceofCSSI’veusedforthehomepageforawebsiteawhileagothatI’vebuilttogetherwithRogerJohansson.
TheHTMLmarkup
Let’stakealookfirstattheHTMLmarkupforthis.Firstweneedtothinkaboutthestructureofthispieceofcontent.HowshoulditbestructuredwithCSSdisabledandstillmakesensefortheuser.Ithinkabulletlistmakessense.Wesumupthe4differentwaystofindyourKansasCityHomesforSale.Thisisthe(X)HTMLmarkup:
HTML：
4differentwaystofindyourKansasCityHomesforSale
1SeeallMLShomeslikeaninsider—joinus
2Whatismyhouseworth?
Findthe
3Google™searchKansasCityareahomesinMLS
4MapKansasCityrealestateinGoogle™maps
IfyoulookatethepagewithCSSdisabled,Ithinkthismarkupiswellstructuredandit’sperfecttobuildthenecessaryCSStoachievethestyleIhaveinmind.
Thebackgroundimages
IfyoulookatthefinalpageandtheeffectIwanttoachievewiththetabs,youknowthatIneedtocreatebackgroundimagesforthisthatareabletogrowiftheuserenlargesthetext.Hereishowtheylook:
diff-tabs-top-wide.gif
diff-tabs-bottom-wide.gif
You'llnoticethatboththehoverbackgroundandthedefaultbackgroundaresavedas1giffile.Thiswaythehovereffectwillgosmoothwithoutinteruption.Theentireimageisloadedandthebrowserdoesn’thavetoloadthehoverimagesonthemomenttheuserhoversthebox.Tobesuretheboxcangrowwesavethebottompartoftheboxandthetoppartofthebox,makingitlongenoughtobesuretherewillbenogaps(tillacertainenlargement).
TheCSSstyles
Theunorderedlist“differences”
ThisistheCSSfortheliststartingwiththeunorderedlistofthe4boxes.TopreventthemarginstocollapseI’veaddedfloat:left. #differences{
margin:0.5em01.5em0;
padding:0;
list-style:none;
width:100%;
float:left;
}
Thelielementstyleslooklikethis:
#differencesli{
margin:018px00;
padding:0;
float:left;
background:url(../images/diff-tabs-top-wide.gif)no-repeat00;
}
Iaddaright-marginof18pxtocreateagutterbetweeneachbox.Thelastboxintherowdoesn’tneedthismargin.Eachlielementhasanid.Theidforthelastoneis#diff-4.SoIaddthisCSSstyle:
#differencesli#diff-4{
margin-right:0;
}
Makingsurethetabbedboxescangrow
Asyou’venoticed,we’velinkedthetoppartofthebackgroundimage(thetabshape)tothelielementviaCSS.Tomakesurethetabbedboxescangrowiftheuserenlargeshistext,weneedtoaddanextradivineachlielement.ThiswaywecanlinkthebottompartoftheimagetothisdivviaCSS:
#differencesdiv{
font-size:0.94em;
padding:6px;
background:url(../images/diff-tabs-bottom-wide.gif)no-repeat0100%;
}
WithCSS3wedon’thavetogothroughthishassleofaddingextradivs,becauseCSS3allowsformultiplebackgroundimagesononeelement.ThisismytopfavoriteCSS3feature:)
Creatingthehovereffect
I’veusedbackgroundpositioningtocreatethehovereffectonthelielementusingthe:hoverpseudo-class.TheCSSlookslikethis:
#differencesli:hover{
background-position:-156px0;
}
#differencesli:hoverdiv{
background-position:-156px100%;
}
Thexcoordinateissetto-156px.Thiswaythepinkorangepartofthebackgroundimagewillbeshown.Thefirststylerepresentsthetoppartofthetabbedboxandthe2ndonethebottompart.RememberIhadtoaddanextradivtomakesuretheboxcangrow(tillacertainenlargement).
Thepageusesadynamicresolutiondependentlayout
Notsureifyou’venoticedornot,butifyouresizeyourbrowserwindowtolessthen750pixelswide,thepagewilladjustitslayout.ThisisdoneusingajavascriptcreatedbyKevinHaleofParticleTreeincombinationwithCSS.I’musinganextraCSSstylesheetthatisappliedifthebrowserwindowisresizedtolessthen750pixels.Bydefaultthepage/siteusesthewiderversion,whichisaimedtoascreenresolutionof1024x768.About90%ofthevisitorsofthePrudentialKansasCityvisitorsareusingascreenresolutionofatleast1024x768pixels.
HopefullysomeofyouhavelearnedfromthisarticleandareinspiredtouseCSSinacreativewaywithoutoverlookingtheaccessibilitypartofitandkeepingtherightstructureinmindforthe(X)HTML.I’mstillcreatingnewtemplatesforthiswebsiteonanoccasionalbasis.Thiswebsiteisratherbigandnewfeaturesareconstantlyaddedbytheclientandthedeveloper.
Ohandlet’snotforgettomentionthatitisalwaysgreattoworktogetherwithRoger.He’spickyinwhathedoes,butthat’swhatIloveaboutworkingwithhim,andofcourseIalwayschallengehimwithmydesigns:)
Previewurl:http://www.prukc.com/
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