I list the data I pulled from the database in treeview. But I have one question. I have a city, county and neighborhood table. I write the districts of the selected province and the neighborhoods of the selected district on the table. There is no problem in printing one by one, but when we select a lot of data (all), this process takes about 17 minutes to run on the network. When I remove my hand from the All key, new data is constantly coming due to the request to the wep api.

What comes to my mind as a solution to this is;

Stopping the network when we stop selecting the All button. Making the user wait using the site by adding a 20-minute delay. (it doesn't make any sense.)

CodePudding user response：

try googling virtual scrolling it may help. Since the ngFor takes time to render the large data using virtual scrolling can help reducing the render time.

CodePudding user response：

private ngUnsubscribeNeighborhood = new Subject(); using the structure. I made a pipe assignment to the place where we subscribe. I set Pipe to takeUntil and assign it to ngUnsubscribeNeighborhood. Then I clicked a button. ngUnsubscribeMahalle.next(); I solved the problem by doing