Value Formatters

Value formatters allow you to format values for display. This is useful when data is one type (e.g. numeric) but needs to be converted for human reading (e.g. putting in currency symbols and number formatting).

Below shows the column definition properties for value formatters.

valueFormatter(params) Function or expression. Formats the value for display.
floatingCellFormatter(params) Function or expression. Formatter to use for a pinned row. If missing, the normal valueFormatter will be used.

The interface for valueFormatter is as follows:

// function for valueFormatter function valueFormatter(params: ValueGetterParams) => any; // interface for params interface ValueFormatterParams { value: any, // the value before the change data: any, // the data you provided for this row node: RowNode, // the row node for this row colDef: ColDef, // the column def for this column column: Column, // the column for this column api: GridApi, // the grid API columnApi: ColumnApi, // the grid Column API context: any // the context } // example value formatter, simple currency formatter colDef.valueFormatter = function(params) { return '£' + params.value; }

Value Formatter vs Cell Renderer

A cell renderer allows you to put whatever HTML you want into a cell. This sounds like value formatters and a cell renderers have cross purposes, so you may be wondering, when do you use each one and not the other?

The answer is that value formatter's are for text formatting and cell renderer's are for when you want to include HTML markup and potentially functionality to the cell. So for example, if you want to put punctuation into a value, use a value formatter, but if you want to put buttons or HTML links use a cell renderer. It is possible to use a combination of both, in which case the result of the value formatter will be passed to the cell renderer.

Be aware that the Value Formatter params won't always have 'data' and 'node' supplied, e.g. the params supplied to the Value Formatter in the Set Filter. As a result favour formatter implementations that rely upon the 'value' argument instead, as this will lead to better reuse of your Value Formatters.

Value Formatter Example

The example below shows value formatters in action.

Floating Cell Formatter

Use floatingCellFormatter instead of colDef.cellFormatter to allow different formatting for pinned rows. If you don't specify a colDef.floatingCellFormatter, then cellFormatter will get used instead if it is present.

You can use the same formatter for pinned rows and normal rows and check the row type. You can check if the row is floating by checking params.node.floating property.