ngif
<div *ngIf="condition; else elseBlock"> <button class="xx" *ngIf="flag" (click)="doFunct()">Next</button> --While (t/f boolean variable called "flag") is true This button will be visible + click button executes function Once this "flag" becomes false this button disapears
angular conditional directives
//if <div *ngIf='[condition]'> </div> //if [condition]==true the div will be shown //for <div *ngFor='let [data] of [dataArray]; let i=index;'> <h2> {{i}} {{data.title}} </h2> <img src='{{data.image}}' /> </div> //the data contained in an array will be displayed element by element //similar to the function .map() in React // ngStyle (conditional Style) <div *ngFor='let [data] of [dataArray]; let i=index;'> <h2 [style.background]="i>1? 'green': 'red'"> {{i}} {{data.title}} </h2> </div> //if the index of the element is 1 or 0, the background will be red, if it is over 1 the background will be green
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