Why is this so difficult to do (record set listing)?

Question

Why is it so hard to create something like this in Appian?

Filed 1 
 Field 2

Checkbox 
 Field1Value 
 Field2Value

3/6 records selected 
 I can get the check boxes and the Field 1 and Field 2 in a table as well as the selected count. 
 What I can't seem to get the total record count.

Amaan Shekh · Accepted Answer

if you are looking for this -> a!localVariables(
 /*/make sure ri!data is notnull*/
 local!fields: a!keys(index(ri!data, 1, "")),
 local!selection,
 local!selectedRows,
 {
 a!gridField(
 label: "Performance Review Schedule",
 labelPosition: "ABOVE",
 data: ri!data,
 columns: {
 a!forEach(
 items: local!fields,
 expression: a!gridColumn(
 label: fv!item,
 value: index(fv!row, fv!item, "")
 )
 )
 },
 pagesize: 10,
 selectable: true,
 selectionValue: local!selection,
 selectionSaveInto: {
 local!selection,
 a!save(
 local!selectedRows,
 append(local!selectedRows, fv!selectedRows)
 ),
 a!save(
 local!selectedRows,
 difference(local!selectedRows, fv!deselectedRows)
 )
 }
 ),
 a!richTextDisplayField(
 labelPosition: "COLLAPSED",
 value: {
 a!richTextItem(
 text: if(
 a!isNullOrEmpty(local!selectedRows),
 "0/" & length(ri!data) & " records selected",
 length(local!selectedRows) & "/" & length(ri!data) & " records selected"
 )
 )
 }
 ),
 a!buttonArrayLayout(
 buttons: {
 a!buttonWidget(
 label: "Delete",
 icon: "trash-solid",
 style: "DESTRUCTIVE",
 disabled: a!isNullOrEmpty(local!selectedRows)/*saveInto: here is logic for delete*/
 
 ),
 a!buttonWidget(
 label: "seprate",
 icon: "code",
 style: "NORMAL",
 /*saveInto: here is logic for seprate*/
 showWhen: not(or(ri!isOnlyDelete)),
 disabled: a!isNullOrEmpty(local!selectedRows)
 )
 },
 align: "START"
 )
 }
)

Why is this so difficult to do (record set listing)?

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