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Angular switch case example

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In this video, we will discuss angular ngSwitch directive. Let us understand switch case with an example. Switch case in angular is a combination of 3 directives
  • ngSwitch directive
  • ngSwitchCase directive
  • ngSwitchDefault directive

Consider the following department data. Depending on the employee's department id we want to display department name.

departments: Department[] = [
  { id: 1, name: 'Help Desk' },
  { id: 2, name: 'HR' },
  { id: 3, name: 'IT' },
  { id: 4, name: 'Payroll' }

ngSwitch example

<div [ngSwitch]="employee.department">
  <span *ngSwitchCase="1"> Help Desk </span>
  <span *ngSwitchCase="2"> HR </span>
  <span *ngSwitchCase="3"> IT </span>
  <span *ngSwitchCase="4"> Payroll </span>
  <span *ngSwitchDefault> N/A </span>

Code Explanation
  • [ngSwitch]="employee.department". The expression (employee.department) returns department id (1, 2 , 3 etc)
  • <span *ngSwitchCase="1"> Help Desk </span>. If the department id is 1, then this switchcase is executed and it displays Help Desk
  • <span *ngSwitchDefault> N/A </span>. The default switch case is executed if the department id is not 1, 2, 3 and 4
  • Jus like ngIf and ngFor, the directives ngSwicthCase and ngSwitchDefault are also structural directives, hence they have an asterisk in front of them
  • If multiple ngSwitchCases match the switch expression value, then all those ngSwitchCases are displayed
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1 comment:

  1. Why declare : departments: Department[] = [ {id: 1, name: 'XX'} ],
    It could not be simply: departments =[ {id: 1, name:'Help Desk' }] ?
    And How you build the 'employee' ? like this: class employee{ departmentid,nameEmploy,..}


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