Yuav ua li cas yuav ua rau ib tug nco-down daim ntawv teev nyob rau hauv lub HTML

Qhov yooj yim nco-down daim ntawv teev nyob rau hauv lub HTML yog ib qho yooj yim los mus tsim siv cov tag xaiv. Qhov no thawv lossis, cim npe kos xaiv nyob rau hauv nws - nws yog lawv uas teem rau hauv daim ntawv khoom.

Muaj ob peb xaiv npe, uas yuav ua tau los ntawm xaiv cov tag: nco-down daim ntawv teev (cov kev xaiv uas poob tom qab txhaj rau cov ntsiab teb los yog yuj dua nws), thiab ib daim ntawv teev txog ntau yam kev xaiv - nyob rau hauv nws tus neeg siv yuav xaiv tau ntau yam khoom. Tus thawj yog ntau ntau, lawv yog ib tug tseem ceeb uas niaj hnub navigation qhov chaw. Lub drop-down daim ntawv teev ntau selections yuav siv tau, piv txwv li, nyob rau hauv lub Wage qhov chaw uas koj xav kom xaiv ib tug ob peb yam ntxwv ntawm cov khoom.

Hloov cov tsos thiab thaj chaw ntawm cov npe, koj muaj peev xwm siv universal thiab muab tshwj xeeb.

xaiv lossis pas

1. Ntau - qhia txog ntau yam kev xaiv.

2. Loj - qhia txog cov naj npawb ntawm cov pom cov kab nyob rau hauv daim ntawv, uas yog lub qhov siab. Thiab ces nws tag nrho cov nyob rau, ntau yam cwj pwm yog tam sim no los yog tsis. Yog hais tias yog li ntawd, thiab koj tsis qhia kom meej loj txaj, ces nyob rau hauv lub xub ntiag ntawm ntau tus neeg siv yuav pom tag nrho koj cov kev xaiv, tab sis, yog hais tias muaj ntau yam uas ploj lawm, yog pom tias yuav tsuas yog ib txoj kab, thiab lwm yam neeg siv yuav muaj peev xwm nyeem, thaum mus nias rau qhov icon ntawm lub elevator nyob rau sab xis. Yog hais tias qhov siab ntawm qhov luaj li cas teev, thiab nws yog tsawg tshaj li tus naj npawb ntawm cov kev xaiv nyob rau txoj cai scroll bar tshwm.

3. Lub npe - lub npe. Lub drop-down daim ntawv teev yuav ua tau tsis tau nws, tab sis nws tej zaum yuav tsim nyog mus nrog qhov kev pab cuam-handler rau cov neeg rau zaub mov. Raws li ib tug txoj cai, lub npe yog tseem tau hais tseg.

Xaiv lossis muaj tsis muaj yuav tsum tau cwj pwm raws li txwv mus rau kev xaiv lossis.

Tej cwj pwm txuas lossis kev xaiv

1. Xaiv - tsim mus rau ntsiab ib daim ntawv teev khoom. Tus neeg siv yuav faib dua ib yam khoom, yog koj muab ntau yam cwj pwm (saib. Saum toj no).
2. Tus nqi - tus nqi. Qhov no attribute yog yuav tsum tau. Lub web neeg rau zaub mov yuav tsum to taub raws nraim li cas daim ntawv teev cov khoom rau cov neeg siv tau xaiv.
3. Daim ntawv lo. Nyob rau hauv ntev heev daim ntawv teev cov ntsiab yuav txo tau siv no tus cwj pwm. Piv txwv li, cov kev tshuaj ntsuam yuav tso saib "Milan", es tsis txhob ntawm cov kev xaiv lossis "Milan - tus thawj tswj centre ntawm Lombardy. Northern Ltalis. " Qhov no attribute kuj yog siv rau cov pab pawg neeg cov khoom nyob rau hauv daim ntawv teev.

Raws li rau lub dav ntawm daim ntawv teev, nws sai rau qhov ntev ntawm lub widest ntawv nyeem nyob rau hauv daim ntawv teev. Ntawm cov hoob kawm, tus dav yuav raug hloov los ntawm kev siv HTML yeej.

Lub drop-down daim ntawv teev nyob rau hauv lwm txoj kev

Nws yuav ua tau nrog CSS, piv txwv li, daim ntawv yuav tshwm sim thaum koj yuj dua ib daim ntawv rau yam khoom. Zoo heev lub sij hawm rau kev tsim npe muab JavaScript, uas simplifies lub chaw ua hauj lwm Jquery tsev qiv ntawv. Lub drop-down daim ntawv uas yog kev cob cog rua nrog no cov tsev qiv ntawv, yuav ua tau heev ua, xws li ib tug cascade. Hais tias yog, thaum koj xaiv ib yam khoom nyob rau hauv ib daim ntawv teev yuav tshwm sim lub nram qab no daim ntawv teev, piv txwv li, muaj yog "Cov poj niam cov khaub ncaws" ntawv qhia zaub mov (thaum koj yuj nco hom ntawm cov khaub ncaws), ces thaum muaj ib tug ntawm cov hom, piv txwv li, "Yav toj txiav" poob-down daim ntawv teev nrog lub ntsiab: tsho loj, chaw ua si, cov tsho tiv no, tsho tiv no thiab thiaj li nyob. n.

Peb tau teev tseg rau hauv lub ntsiab ces dag txoj kev nyob rau hauv uas koj muaj peev xwm tsim ib tug nco-down daim ntawv teev. Ntawm cov hoob kawm, muaj ntau ntau yam nuances nyob rau hauv lub HTML, nyob rau hauv lub CSS thiab nyob rau hauv JavaScript, uas tso cai rau koj yuav hloov lub functionality thiab cov tsos ntawm cov npe views.