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Anonymous's avatar
Anonymous
Not applicable
3 years ago
Solved

Navigator window not displaying function input parameters. Custom Connector for Power BI

Hi,   I am trying to create a custom connector for Power BI. I have followed the documentation on how to set up a Navigation Table. The table will navigate to three different functions. I have ...
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  • Anonymous's avatar
    Anonymous
    3 years ago

    So I found a solution from the PowerBI REST API connector project. Basically you need a special implementation of the Table.ToNavigationTable function. It seems that you need to delete the "Preview.DelayColumn = itemNameColumn" from Table.ToNavigationTable .

     

     

    This implementation of the navigation table works:

     

    Table.ForceToNavigationTable = (
    table as table,
    keyColumns as list,
    nameColumn as text,
    dataColumn as text,
    itemKindColumn as text,
    itemNameColumn as text,
    isLeafColumn as text
) as table =>
    let
        tableType = Value.Type(table),
        newTableType = Type.AddTableKey(tableType, keyColumns, true) meta 
        [
            NavigationTable.NameColumn = nameColumn, 
            NavigationTable.DataColumn = dataColumn,
            NavigationTable.ItemKindColumn = itemKindColumn, 
            NavigationTable.IsLeafColumn = isLeafColumn
        ],
        navigationTable = Value.ReplaceType(table, newTableType)
    in
        navigationTable;

     

     

    The only problem I have now is that the documentation is not shown in the Navigator window:

     

    In the Power Query Editor it looks like this:

     

     

     

     

     

Anonymous's avatar
Anonymous
Not applicable
3 years ago

Hi Anonymous ,

Please refer the following links to get it:

Handling navigation for Power Query connectors | Microsoft Docs

shared NavigationTable.Simple = () =>
    let
        objects = #table(
            {"Name",       "Key",        "Data",                           "ItemKind", "ItemName", "IsLeaf"},{
            {"Item1",      "item1",      #table({"Column1"}, {{"Item1"}}), "Table",    "Table",    true},
            {"Item2",      "item2",      #table({"Column1"}, {{"Item2"}}), "Table",    "Table",    true},
            {"Item3",      "item3",      FunctionCallThatReturnsATable(),  "Table",    "Table",    true},            
            {"MyFunction", "myfunction", AnotherFunction.Contents,       "Function", "Function", true}
            }),
        NavTable = Table.ToNavigationTable(objects, {"Key"}, "Name", "Data", "ItemKind", "ItemName", "IsLeaf")
    in
        NavTable;

shared FunctionCallThatReturnsATable = () =>
    #table({"DynamicColumn"}, {{"Dynamic Value"}});

Custom Connector and Navigation Tables

 GetRows = () => if (state <> null) then state else
                    let
                        list = listFunction(),
                        withName = Table.FromRecords(list, {"Name", "ItemKind", "Parameters"}, MissingField.UseNull),
                        withData = Table.AddColumn(withName, "Data", each dataFunction([Name], [Parameters])),
                        withItemName = Table.AddColumn(withData, "ItemName", each if [Parameters] = null or Record.FieldCount([Parameters]) = 0 then "Table" else null),
                        withoutParameters = Table.RemoveColumns(withItemName, {"Parameters"}),
                        withIsLeaf = Table.AddColumn(withoutParameters, "IsLeaf", each isLeaf),
                        navTable = Table.ToNavigationTable(withIsLeaf, {"Name"}, "Name", "Data", "ItemKind", "ItemName", "IsLeaf")
                    in
                        navTable

Best Regards