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Yes, this is the normal behaviour of reduce when you don't...
finally i found a solution. I let it here if someone else need it.
I used some css to change the opacity of the videos and images.
Here is the HTML and Javascript code:
...When you use dot notation, key means the actual property in the object, which will not be there. So, undefined is returned which is not equal to true.
Your return response; won't be of any use. You can pass a function as an argument to get_json, and have it receive the result. Then in place of return...
Ajax requests are asynchronous. so a new request is not going for the previous one to finish. If you want that behaviour use async parameter to false, or use the complete() function to call for...