JavaScript Data Grid: Grid Size - AG Grid

Under normal usage, your application should set the width and height of the grid using CSS styles. The grid will then fit the width you provide and use scrolling inside the grid to allow all rows and columns to be viewed.

<!-- set width using percentages --> <div id="myGrid" style="width: 100%; height: 100%;"></div> <!-- OR set width using fixed pixels --> <div id="myGrid" style="width: 500px; height: 200px;"></div>

If using % for your height, then make sure the container you are putting the grid into also has height specified, as the browser will fit the div according to a percentage of the parent's height, and if the parent has no height, then this % will always be zero.

If your grid is not the size you think it should be then put a border on the grid's div and see if that's the size you want (the grid will fill this div). If it is not the size you want, then you have a CSS layout issue in your application.

DOM Layout

There are three DOM Layout values the grid can have 'normal', 'autoHeight' and 'print'. They are used as follows:

• normal: This is the default if nothing is specified. The grid fits the width and height of the div you provide and scrolls in both directions.
• autoHeight: The grid's height is set to fit the number of rows so no vertical scrollbar is provided by the grid. The grid scrolls horizontally as normal. Note that if using this with the SSRM the grid will attempt to load every row and may cause undesired side-effects (such as excessive datasource requests or too many loaded rows).
• print: No scroll bars are used and the grid renders all rows and columns. This layout is explained in Printing.

Normal Layout

If the width and / or height change after the grid is initialised, the grid will automatically resize to fill the new area.

The example below shows setting the grid size and then changing it as the user selects the buttons.

Dynamic Resizing without Horizontal Scroll

Sometimes you want to have columns that don't fit in the current viewport to simply be hidden altogether with no horizontal scrollbar.

To achieve this determine the width of the grid and work out how many columns could fit in that space, hiding any that don't fit, constantly updating based on the gridSizeChanged event firing, like the next example shows.

This example is best seen when opened in a new tab - then change the horizontal size of the browser and watch as columns hide/show based on the current grid size.

Dynamic Vertical Resizing

Sometimes the vertical height of the grid is greater than the number of rows you have it in. You can dynamically set the row heights to fill the available height as the following example shows:

Auto Height Layout

Depending on your scenario, you may wish for the grid to auto-size it's height to the number of rows displayed inside the grid. This is useful if you have relatively few rows and don't want empty space between the last row and the bottom of the grid.

To allow the grid to auto-size its height to fit rows, set grid property domLayout='autoHeight'.

When domLayout='autoHeight' then your application should not set height on the grid div, as the div should be allowed flow naturally to fit the grid contents. When auto height is off then your application should set height on the grid div, as the grid will fill the div you provide it.

If using Grid Auto Height, then the grid will render all rows into the DOM. This is different to normal operation where the grid will only render rows that are visible inside the grid's scrollable viewport. For large grids (eg >1,000 rows) the draw time of the grid will be slow, or for very large grids, your application can freeze. This is not a problem with the grid, it is a limitation on browsers on how much data they can easily display on one web page. For this reason, if showing large amounts of data, it is not advisable to use Grid Auto Height. Instead use the grid as normal and the grid's row virtualisation will take care of this problem for you.

The example below demonstrates the autoHeight feature. Notice the following:

• As you set different numbers of rows into the grid, the grid will resize its height to just fit the rows.
• As the grid height exceeds the height of the browser, you will need to use the browser vertical scroll to view data (or the iFrames scroll if you are looking at the example embedded below).
• The height will also adjust as you filter, to add and remove rows.
• If you have pinned rows, the grid will size to accommodate the pinned rows.
• Vertical scrolling will not happen, however horizontal scrolling, including pinned columns, will work as normal.
• It is possible to move the grid into and out of 'full height' mode by using the api.setGridOption('domLayout', layout) or by changing the bound property domLayout.

The following test is best viewed if you open it in a new tab, so it is obvious that there are no scroll bars. Note that if you use the example inlined the scroll bars shown are for the containing iframe, not the grid.

Min Height with Auto Height

When using Auto Height, there is a minimum of 150px set to the grid rows section. This is to avoid an empty grid which would look weird. To remove this minimum height, add the following CSS:

.ag-center-cols-viewport { min-height: unset !important; }

It is not possible to specify a max height when using auto-height.

Users ask is it possible to set a max height when using auto-height? The answer is no. If using auto-height, the grid is set up to work in a different way. It is not possible to switch. If you do need to switch, you will need to turn auto-height off.

Print Layout

For details on displaying the grid in a printer friendly layout see the Print Layout page.