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How to let a user switch between blocks that need to be shown?

I have pre-defined blocks A,B and C that are meant to be placed in the sidebar_first region. What I would like to achieve is: a visitor could select the block that needs to be displayed for the sidebar_first region when click on a dropdown button containing option A, B and C. This dropdown button should exist somewhere on the same page of these blocks (means the visitor will not do it in the admin pages).

For example, if Option A is selected by default, then only Block A should be shown. If the visitor clicks on Option B, then Block A will be hidden (or removed) and Block B will show up.

The way I could think of is to disable and enable blocks programmatically on clicking the dropdown button, and then refresh the region via ajax, but I have no clue how this can be acheived. I am also open to other approaches.

This article was republished from its original source.
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How to let a user switch between blocks that need to be shown?

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