Inkinga enkulu ehlobene nokusebenzisa ukuqondisa kwe-ngFor ngenkomba ukuthi kungaholela emiphumeleni engalindelekile lapho idatha iphindwaphindwa phezu kwezinguquko. Lokhu kungenxa yokuthi inkomba ayibuyekezwa ngokuzenzakalelayo lapho izinto zengezwa noma zikhishwa ohlwini, ngakho-ke uma into entsha yengezwa kunkomba 0, zonke ezinye izinto zizokwehliswa ngeyodwa. Lokhu kungaholela ekutheni idatha engalungile iboniswe ekubukeni kwakho noma ukuziphatha okungalindelekile kuhlelo lwakho lokusebenza.
<ul>
<li *ngFor="let item of items; let i = index">{{i}} - {{item}}</li>
</ul>
1. Lo mugqa wekhodi udala uhlu olungahlelekile.
2. Umyalelo we-*ngFor usetshenziselwa ukuxhuma kuhlu lwezinto futhi ubonise into ngayinye ohlwini.
3. Igama elingukhiye elithi let lisetshenziselwa ukumemezela okuhlukile okubizwa ngokuthi “into” ephethe into yamanje ekuphindaphindweni kweluphu.
4. Igama elingukhiye elithi let lisetshenziselwa ukumemezela okuguquguqukayo okubizwa ngokuthi “i” okuphethe inkomba yento yamanje ekuphindaphindweni kweluphu.
5. Lo mugqa ubonisa into ngayinye ohlwini nenombolo yayo yenkomba (kusukela ku-0).
Yini i-Angular
I-Angular iwuhlaka lohlelo lwewebhu olusekelwe kumthombo ovulekile ongaphambili olusekelwe ku-JavaScript olunakekelwa ikakhulukazi i-Google kanye nomphakathi wabantu ngabanye nezinkampani ukuze kubhekwane nezinselele eziningi okuhlangatshezwane nazo ekuthuthukiseni izinhlelo zokusebenza zekhasi elilodwa. Izingxenye ze-JavaScript zihambisana ne-Apache Cordova, uhlaka olusetshenziselwa ukuthuthukisa izinhlelo zokusebenza zeselula ezihlukene. Ihlose ukwenza kube lula kokubili ukuthuthukiswa nokuhlolwa kwalezo zinhlelo zokusebenza ngokunikeza uhlaka lwezakhiwo ze-model-view-view-controller (MVC) ze-client-side model-view-viewmodel (MVVM), kanye nezingxenye ezivame ukusetshenziswa ezinhlelweni ezicebile ze-inthanethi.
ngFor element
I-NgFor iyisiqondiso sesakhiwo se-Angular esisivumela ukuthi sidlule kudatha futhi sakhe isifanekiso sento ngayinye ohlwini noma into. Isetshenziselwa ukuphinda ingxenye ye-HTML enikeziwe inombolo ecacisiwe yezikhathi. I-NgFor ingasetshenziswa ukubonisa idatha evela kumalungu afanayo, into, noma iyunithi yezinhlamvu. Ingase futhi isetshenziselwe ukukhiqiza izakhi ze-HTML ngokusekelwe kumanani welungu elifanayo noma into. I-NgFor ijwayele ukusetshenziswa ngokuhlanganiswa nezinye iziqondiso ze-Angular ezifana ne-ngIf ne-ngSwitch.
Ungayithola kanjani inkomba ye-ngFor element
Ungasebenzisa igama elingukhiye lenkomba ukuze uthole inkomba ye-elementi kuluphu ye-ngFor. I-syntax yalokhu imi kanje:
Kulesi sibonelo, okuguquguqukayo kokuthi "i" kuzoqukatha inkomba yamanje yeluphu. Ungasebenzisa lokhu okuguquguqukayo ukuze ufinyelele noma uguqule izici ohlwini lwakho.
