Table
Tables for dynamic data; follow the examples closely, including the #cell ref
Contents
[rowTrackBy]="trackByFn"
The *ngFor directive removes table rows from the DOM and recreates them each time the data source changes. This is an expensive operation for large tables, and can cause performance problems.
Specify a custom trackBy function to let Angular know which rows do not need to be destroyed. The return value of this function will be used as a key to identify each row. Rows which have the same key as the previous data source are reused rather than destroyed.
If not provided, Angular defaults to object identity to track each row, i.e. the object reference itself is the key. Keep in mind that Observables generally produce immutable data structures, which means that object identities will change with each emission.
Name | Age | Job Title | Salary |
|---|---|---|---|
Name Alice | Age 24 years of age | Job Title Software Engineer | Salary $88,000.00 |
Name Bob | Age 23 years of age | Job Title Product Manager | Salary Undisclosed Salary |
Name John | Age 22 years of age | Job Title Data Scientist | Salary $98,000.00 |
Emits the index of the currently expanded row - undefined if no row is expanded