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JavaScript jQuery Basics (2014) Creating a Simple Drawing Application Perform: Part 1

lesak
lesak
6,260 Points
Posted by lesak
lesak
6,260 Points

Why are the siblings deselected first in the click function before the class "selected" is added to the clicked element?

Trying to understand the structure of the function.

3 Answers

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

The "selected" class gives the element a unique visual appearance. It is removed from the siblings of the clicked item so that only the clicked item will have the special look.

Otherwise, as you click on the different elements, eventually each one would get the special look and they would all look the same.

Why not temporarily comment out the line that clears the siblings and try it out?

lesak
lesak
6,260 Points
lesak
lesak
6,260 Points

Good idea. Thanks for your helpful answer.

docgunthrop
docgunthrop
12,445 Points
docgunthrop
docgunthrop
12,445 Points

In this particular example, the order does not matter, as the CSS styling change occurs instantaneously (thanks to modern computer processing power). If you put the line that adds the "selected" class to the clicked list item before the line that removes that class from the sibling list items, you'll see that it makes no difference.

If you want to see a difference in the sequence of changes, you can add a timeout.