angular 4 style background image when using ngFor
Refer to this one Angular2 dynamic background images
// inappropriate style.backgroundColor [style.backgroundColor]="course.imageUrl"// style.backgroundImage[style.backgroundImage]="'url('+ course.imageUrl +')'"
thank you for your answers,the correct code is
[ngStyle]="{'background-image':'url(' + course.imageUrl + ')'}">
You should use background instead of backgroundColor
[style.background]="'url('+course.imageUrl+')'"