Hi all,
I'm relatively new to QlikView and have learned a great deal so far from all of your super advice by reading discussions on a variety of topics. This time, however, I couldn't find an answer to my question so I thought it best to ask you directly.
I am tasked with creating a line chart where the results of different list box picks are filtered down in the chart results. No problem - that's how a chart works in QV. When a user makes multiple selections from the CallWeekEnding list box (which contains a week ending date for each week), the chart should create a new line. This will allow users to compare one week's results to another week. The chart dimension will be a daily (Monday - Sunday) breakdown. Users will be able to select/compare up to 4 weeks.
This caused me to think about set analysis. But, how do I capture and isolate individual selections from the CallWeekEnding list box? And how do I take those selections and graph them separately? Here is my thought process. Isolate individual selections by creating expression-fed variables. Use the values of those variables in separate expressions in the chart so that each expression is graphed separately. It seemed like a great plan, but it didn't work.
I created 5 variables: vSelectedCallWeekEnding1 through vSelectedCallWeek4, and vSelectedCallWeekEnding. For the latter, the definition is GetFieldSelection(CallWeekEnding). The definition I created for vSelectedCallWeekEnding1 is this: If(GetSelectedCount(CallWeekEnding)>=1,SubField($(vSelectedCallWeekEnding),',',1),''). Basically, if there is at least one item selected from Call Week Ending, then using the SubField function, parse the value saved in vSelectedCallWeekEnding using comma as a delimiter, and return the first delimited value. vSelectedCallWeekEnding2 through vSelectedCallWeek4 use the same definition, except I change out the "1" in the definition for 2, 3 or 4, depending on the variable I am trying to define.
So, I thought if I took vSelectedCallWeekEnding1 and put it in a chart expression, I would get a graphed line. Wrong. Didn't happen. So, I created three text boxes to test my values.
Text box 1: =$(vSelectedCallWeekEnding1) The value returned was 7/13/2014, which is exactly what I have selected in the list box. So far so good.
Text box 2: =If($(vSelectedCallWeekEnding1)='7/13/2014','Equal','Not Equal'). This was to test whether or not the value saved in the variable matched what I thought it should be -- '7/13/2014'. If it matches, the expression should return 'Equal'. And that's just what it did. Yay.
Text box 3: Compare the set analysis expression I attempted in my chart to the same expression with the hard coded value 7/13/2014. =Count({$<CallWeekEnding={'$(vSelectedCallWeekEnding1)'}>session_key) & Chr(10) & Count({$<CallWeekEnding={'7/13/2014'}>}session_key) The results were surprising to me. The text box returned 0 100000.
So, despite the fact that in text box 2, I performed a test to compare the value of vSelectedCallWeekEnding1 to '7/13/2014' and the test came back as the values were equal, the expressions in text box 3 that performed set analysis upon the variable and the hard-coded value evaluated differently.
Can someone please explain to me why they evaluated differently, and if there is a better approach to graphing up to 4 different week-ending picks as separate expressions in the same chart(perhaps alternate state?) than what I have conceptualized here?
