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satishr's avatar
satishr
Helper III
8 years ago
Solved

Field order change issue when using options.dataViews[0].table.rows in my custom visual

Hi guys, I have created a simple custom visual widget where I'm using options.dataViews[0].table.rows to get data. The visual takes 3 fields as input - Actual, Target and Category. It works fine whe...
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v-viig's avatar
v-viig
Community Champion
8 years ago

Hello satishr,

 

You're able to get value index in the row by getting index from dataView.metadata.columns.

Each column has the roles object that indicates the role of this column (the roles contains column name).

 

Ignat Vilesov,

Software Engineer

 

Microsoft Power BI Custom Visuals

[email protected]

  • satishr's avatar
    satishr
    Helper III
    8 years ago

    Hi v-viig, I'm using the below code to fetch data. Can you let me know how to use roles object here? Sorry, I'm new to JSON structures.

     

    for (var i = 0; i < rows.length; i++) {
    var row = rows[i];
    resultData.push({
    Indicator: +row[0],
    Target: +row[1],
    Date: row[2].toString(),
    });

    }
    • v-viig's avatar
      v-viig
      Community Champion
      8 years ago

      Please use this code snippet to parse values from table mapping:

       

          export interface ColumnGroup {
        [columnName: string]: number | Date | string;
    }

    function getColumnGroupByRole(
        columns: DataViewMetadataColumn[],
        row: DataViewTableRow
    ): ColumnGroup {
        const columnGroup: ColumnGroup = {};

        row.forEach((value: any, valueIndex: number) => {
            const column: DataViewMetadataColumn = columns[valueIndex];

            Object.keys(columns[valueIndex].roles)
                .forEach((roleName: string) => {
                    columnGroup[roleName] = value;
                });
        });

        return columnGroup;
    }

    function parseData(dataView: DataView) {
        const data: any[] = [];

        dataView.table.rows.forEach((row: DataViewTableRow) => {
            const columns = getColumnGroupByRole(dataView.metadata.columns, row);

            data.push({
                Indicator: +columns["Indicator"],
                Target: +columns["Target"],
                Date: columns["Date"]
                    ? columns["Date"].toString()
                    : null
            });
        });

        return data;
    }

      Ignat Vilesov,

      Software Engineer

       

      Microsoft Power BI Custom Visuals

      [email protected]