How to do loading of blocks via Ajax?

I have 10 references to city by clicking on one of the links on the bottom should be a block which will map. 10 units on these maps are. But don't want them all loaded, and loaded via ajax
June 14th 19 at 18:52
1 answer
June 14th 19 at 18:54
And the backend, which will give the data on request, is there?

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