JavaScript Data GridRow Styles

Row customisation can be achieved in the following ways:

• Row Style: Providing a CSS style for the rows. Applied individually to each element.
• Row Class: Providing a CSS class for the rows. Not removed on data refresh.
• Row Class Rules: Providing rules for applying CSS classes. These styles are dynamic and applied in batches.

Each of these approaches are presented in the following sections.

Row Style

You can add CSS styles to each row in the following ways:

const gridOptions = {
    // set background colour on every row, this is probably bad, should be using CSS classes
    rowStyle: { background: 'black' },

    // set background colour on even rows again, this looks bad, should be using CSS classes
    getRowStyle: params => {
        if (params.node.rowIndex % 2 === 0) {
            return { background: 'red' };
        }
    },

    // other grid options ...
}

If your data is static, use row classes to apply styles for better performance.

Row Class

You can add CSS classes to each row in the following ways:

const gridOptions = {
    // all rows assigned CSS class 'my-green-class'
    rowClass: 'my-green-class',

    // all even rows assigned 'my-shaded-effect'
    getRowClass: params => {
        if (params.node.rowIndex % 2 === 0) {
            return 'my-shaded-effect';
        }
    },

    // other grid options ...
}

Row Class Rules

You can define rules which can be applied to include certain CSS classes via the grid option rowClassRules. These rules are provided as a map where the keys are class names and the values are expressions that if evaluated to true, the class gets used. The expression can either be a function, or a string which is treated as a shorthand for a function by the grid.

The following snippet shows rowClassRules that use functions and the value from the year column:

const gridOptions = {
    rowClassRules: {
        // apply green to 2008
        'rag-green-outer': (params) => { return params.data.year === 2008; },

        // apply amber 2004
        'rag-amber-outer': (params) => { return params.data.year === 2004; },

        // apply red to 2000
        'rag-red-outer': (params) => { return params.data.year === 2000; }
    },

    // other grid options ...
}

Row Style/Class Functions

All rowStyle, rowClass and rowClassRules functions take a RowClassParams params object.

As an alternative, you can also provide shorthands of the functions using an expression. An expression is evaluated by the grid by executing the string as if it were a Javascript expression. The expression has the following attributes available to it (mapping the the attributes of the equivalent params object):

• ctx: maps context
• node: maps node
• data: maps data
• rowIndex: maps rowIndex
• api: maps the grid api

The following snippet shows rowClassRules applying classes to rows using expressions on an age column value:

const gridOptions = {
    rowClassRules: {
        'rag-green': 'data.age < 20',
        'rag-amber': 'data.age >= 20 && data.age < 25',
        'rag-red': 'data.age >= 25',
    },

    // other grid options ...
}

Refresh of Styles

If you refresh a row, or a cell is updated due to editing, the rowStyle, rowClass and rowClassRules are all applied again. This has the following effect:

• rowStyle: All new styles are applied. If a new style is the same as an old style, the new style overwrites the old style.
• rowClass: All new classes are applied. Old classes are not removed so be aware that classes will accumulate. If you want to remove old classes, then use rowClassRules.
• rowClassRules: Rules that return true will have the class applied the second time. Rules that return false will have the class removed second time.

Example Row Class Rules

The example below demonstrates rowClassRules:

• rowClassRules are used to apply the class sick-days-warning when the number of sick days > 5 and <= 7, and the class sick-days-breach is applied when the number of sick days >= 8.

• The grid re-evaluates the rowClassRules and applies styles when the data is changed independent of mechanism. See Updating Data for details on methods to update data.

Highlighting Rows and Columns

The grid can highlight both Rows and Columns as the mouse hovers over them.

Highlighting Rows is on by default. To turn it off, set the grid property suppressRowHoverHighlight=true.

Highlighting Columns is off by default. To turn it on, set the grid property columnHoverHighlight=true.

const gridOptions = {
    // turns OFF row hover, it's on by default
    suppressRowHoverHighlight: true,
    // turns ON column hover, it's off by default
    columnHoverHighlight: true,

    // other grid options ...
}

In this example Rows and Columns are highlighted.

Note if you hover over a header group, all columns in the group will be highlighted.

In this example Column highlighting is disabled by default and Row highlighting has been disabled using suppressRowHoverHighlight=true.

Row Highlighting works by the grid adding the CSS class ag-row-hover to the rows getting hovered. The grid cannot depend on using CSS :hover selector as this will not highlight the entire row if Columns are pinned.

Column Highlighting works by the grid adding the CSS class ag-column-hover to all Cells to be highlighted.

Styling the First and Last Rows

It's possible to style the first and last rows of the grid using CSS by targeting the .ag-row-first and .ag-row-last selectors as follows:

.ag-row.ag-row-first {
    background-color: #2244CC44;
}

.ag-row.ag-row-last {
    background-color: #CC333344;
}