How mark selected item from the datatable PrimeNg?

Question

I use the selectionMode = "multiple" option of datatable, How mark selected item from the database

Template:

<p-dataTable [value]="userLanguage" dataKey="key">
 <p-column [style]="{'width':'38px'}" selectionMode="multiple"></p-column>
 <p-column field="languageName" header="Idioma"></p-column>
 <p-column field="languageId" header="Código"></p-column>
</p-dataTable>

Answer 1

selectionMode="multiple" needs to go into your p-dataTable line, not on the column. Also, you need to define what model you want to store your selected items, such as [(selection)]="selectedLanguages" on the same line. To display certain items as selected, you need to add the languages to the selectedLanguages array