Well, my problem is in certain way easy but I'm crazy making the others projects for the university. So, the project is a visualization in d3js library. I have four visualizations and I need to make...

Well, my problem is in certain way easy but I'm crazy making the others projects for the university.
So, the project is a visualization in d3js library. I have four visualizations and I need to make two things works in one of them: the bar chart.

The bar chart has information about 4 things: GDP, HDI, Life Expectancy and Unemployment – that are indicators for the information that I want to show. And I have a drop down menu to select what indicator I want to see. Each one of this indicators are from a country. All this data come from a .json file. Now, this bar chart only reads the .json file and draw the bar chart.

What I need:

1. the dashboard has a slider to choice the year's interval for the visualizations. I need that this works in bar chart. I select the interval in this slider and my bar chart updates with the interval (in years) - I'm using a dispatch for this.
2. the dashboard has a world map and when I select a country in this world map I want that this filter the country in my bar chart, showing the respective indicators for the country.

That's it!

I know that this is not a big problem but I'm really having trouble with js and I need help. I spent so much time on this and couldn't do it right.