angular 2 updating material table

Issue at Hand: I am facing a problem with the interaction between a dropdown menu and a table on my website. Imagine the dropdown menu contains a list of cities, and below it is a table displaying information about those cities. I want to ensure that when a user selects a city from the dropdown, the corresponding row for that city appears as the first row in the table. While I have managed to update the data structure/array behind the scenes to achieve this, I'm struggling to figure out how to make the table refresh and display the updated row. How can I accomplish this in the provided sample code? For example, how can I make the 'Boron' entry show up as the first row when a specific button is clicked on this stackblitz demo: https://stackblitz.com/angular/epkqlvvjdqn?file=app%2Ftable-basic-example.ts

angulartypescriptangular-materialangular-material-table

Answer №1

To easily swap array items, you can leverage destructuring in your code like this:

myArray = new MatTableDataSource();
  ngOnInit(){
    this.myArray.data = ELEMENT_DATA;
  }
  switchItems(){
    let data = this.myArray.data;

    [data[1],data[3]] = [data[3],data[1]];

    this.myArray.data = data;    
  }

Check out a live demo here: https://stackblitz.com/edit/angular-abc123

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