Drill Down for Multiple Series in a Line Chart

Question

Hello,
I seem to have a problem with the drill-down functionality in a line chart that has multiple series.
I have a line chart that displays the readings of a patient over a period of 1 month. For each day, there is the glucose level reading, blood pressure reading, etc... So, each reading is a different series in my line chart graph.
The basic requirement is: With a mouse over event on the chart, I am willing to display all the data that belongs to that day. The data will be displayed at the bottom of the screen in a small panel. It is very simple to do it when the line chart has only 1 series:
i) Enable drill down.
ii) Choose 'Row' as insertion type.
iii) Fill out the destination field.
iv) Make sure your labels (at the bottom of the screen) get the data from the destination cell.
When there is more than one series, it becomes very difficult. XCelsius will not let me use the same destination cells for different series. So, I will have to use other destination cells. In that case, I will not know on which day is the user on. Is there any way to achieve this functionality?
Let me know if you need further information.

Answer 1

This is certainly possible, but there's a bit of a trick to it (and really hard to explain without screenshots!). There's two halves to it:
1. Write the date that has been selected to a cell (for each series).
2. Write the name of the series that was clicked to some cell (this is the property 'Series Name Destination').
So let's say your three series are Glucose, Blood Pressure and Temp. Have those series names in B1,C1,D1 (with your dates down in column A). Insert a row below the series names (2:2), and then set up your insertion type for the chart as 'row'. The source data (for all three series) should be your list of dates in column a. The insertion cells for the three series will be, in order, B2,C2,D2. Now, depending on which point is clicked in the chart, the selected day will be inserted into one of those three cells. Completely useless unless you know which series was clicked.
So you need to insert the name of the series that was clicked ('Series Name Destination') into the spreadsheet, let's say in F1. The rest is just Excel formulas. The logic is, you can now tell what series was clicked, and go and look up the date that was inserted for that series, then go and look up the row that corresponds to that date. So to get the date that was just clicked, your formula (in F2) would be =HLOOKUP(F1,B1:D2,2,0).
Then a VLOOKUP will get the results from that row of data. For example, if I inserted another row at row 3 (to show my 'result' values) the formula in B3 would be =VLOOKUP($F$2,$A$4:$D$13,2,0).
I hope that makes sense.