Blazor Grid Sizing
There are many different ways to size the
IgbGrid in order to accommodate a lot of scenarios that the users can have. While some are straight forward, others might be more complex and that is why we will take each one and look into them in more depth. We will go through setting
Height separately since there are some differences. For example, when using percentages for each.
[!Note] If the Border box sizing is overridden by the user we cannot guarantee that the
IgbGridwill size correctly.
Blazor Grid Width
Width can accepts value of
null, which when set, renders all columns in the DOM. The grid sizes accordingly so there is no grid horizontal scrollbar since column virtualization is not applied.
- If there are 6 columns and none of them has width defined, the grid will have
816px, because each column by default have assigned
136pxin this scenario. Same will happen if the columns have
Widthin percentages. If vertical scrollbar is rendered or there are features that render additional columns their width will be added also.
- If there are 6 columns with column width set to
200pxthey will fit in our window and all will be visible:
- If there are more columns or ones with bigger width that go out of the browser's view, they will all still render. Let's have the same amount of columns but each with column width of
300px. Since they don't all fit in the browser view area, it will create a scrollbar natively. The next example displays this exact scenario:
- If the grid has a parent element of any sort and it doesn't have any overflow set, it will still render all columns visible. Otherwise if the parent element has overflow
scroll, a scrollbar for that parent element will be rendered natively. The parent has bigger height for easier visualization in the following example.
[!Note] Due to this behavior, if the grid data contains too many columns, it might have significant impact on the browser performance, since all columns would be rendered without virtualization.
IgbGrid has its
Width input is set to pixels it will set the whole grid size to that value and it will be static. It will not react to any browser resizing or changes in the DOM, although this is not the case for the grid content:
- When width is set in pixels in order for the grid to render horizontal scrollbar, its content width needs to exceed the specified grid
Width. Let's, for example, have the combined width of the columns exceed
1200px. In this case a horizontal scrollbar will be rendered.
- For scenarios where the grid has a parent element, it depends on the parent styling if it will render scrollbar or not. Everything else related to the grid itself is still retained. If the parent element width is smaller than the grid's width and has overflow style set to
scroll, it will render scrollbar natively. For example, if the parent has
1200px, it will look similar to the following illustrations:
Width of the
IgbGrid is set to percentages it will size the grid according to the parent element's width. If the parent element does not have width specified the
IgbGrid will size relative to the browser window.
- For example, if we set the grid
100%and there is no parent element it will fill 100% of the available width of the browser window. If it is resized the grid will resize as well accordingly.
- If we set grid's width to
100%and there is a parent element that has specific width of
1200px, this will mean that the grid will size relative to that element and his final width will be
- If we have a parent element with
1000pxand have the grid's
150%, the calculated grid width will be
1500px. In this case the grid will still render fully visible but if we set
overflow: autoof the parent, that parent will render scrollbar on its own.
Blazor Grid Height
By default if no height is defined for the
IgbGrid, it will be set to
100%. You can check how the grid reacts depending on the DOM structure in the
[!Note] Setting manually the
Heightstyle of the
IgbGriditself will result in an unexpected behavior.
Height input can accept
null value, which when set, displays all rows with no scrollbar no matter how many they are. In this case, there is no vertical virtualization since the grid renders all rows anyway.
- If we have data with 14 rows in this case the grid will render all 14 of them and size the grid so all are visible without any empty space inside the grid.
- If we have 24 rows instead, the grid will still render all rows but since they are too many, they exceed the browser boundaries. That's why the browser itself will render vertical scrollbar by default so the user can scroll down to the rest of the rows.
- If there is a parent element with defined
Height, the grid will still render all rows and not be affected. Let's say the parent has
650px. If it has
scroll, it will render a vertical scrollbar but the grid will still be unaffected:
[!Note] Due to this behavior, if the grid data contains too many rows, it might have significant impact on the browser performance, since all rows would be rendered without virtualization.
- If we set, for example, the height
500pxwith 4 rows for our data the grid will sit to that size and since 4 rows are not enough to fill the visible area it is expected to have some empty area.
- If the number of rows exceeds the visible area of the grid when
Heightis set to pixels a vertical scrollbar will be rendered. For example, a grid with
500pxheight set and 14 rows will be rendered the following way:
- If there is a parent element with
Heightdefined, unless it has
scroll, the grid will still be fully visible. Otherwise it will render a scrollbar.
Height input is set to percentages, the
IgbGrid will size based on the parent element height. If the parent element has its
Height set in pixels or percentages, the grid will size relative to the size of the parent.
When the parent element does not have defined height, the browser does not assign height to it initially and sizes it based on its children and their size. That is why there is no way for the grid to know what base height to use in order to apply percentage sizing based on it. For this reason, it will render a maximum of 10 rows and if they are more rows, a vertical scrollbar will be rendered. Otherwise, the grid will fit to number of rendered rows. We will look in this scenario in more detail in the next examples.
Width set to
1200px and the parent element not having any size applied to it:
- If there are less than 10 rows the grid will try to fit all rows in the visible area without having an empty space between the last row and the bottom of the visible area. For example, let's have the grid data to consist of 7 rows. The grid will render all 7 rows without vertical scrollbar and without empty space inside the grid.
- If there are more than 10 rows a vertical scrollbar will be rendered for the rest of the rows and only 10 rows can be visible at any time. In the next example only the row number is increased to 14.
- If we set the parent element height to
100%height this means that the grid will be sized to 100 percentages of
- If the
Heightis set to a number bigger than
100%and the parent element has height, for the parent to render scrollbar it again needs to have
scroll. Otherwise the grid will be fully visibly and size relative to the parent size.
- If we want the grid to be sized to
100%from the browser window we would need to set both
bodyand parent grid element heights to
100%. In this case, the parent element can be sized and the grid will size accordingly if the browser is resized.
Blazor Grid Column Sizing
Depending on the grid size itself, the columns inside it can also be sized differently that could result in scenarios where the grid renders horizontal scrollbar or not. Columns can have width set in pixels, percentages or autosized when nothing is set. We will take a deeper look regarding these scenarios in this section.
By default when a column doesn't have a specified width it will try to autosize, so that it fills if any empty space is available in the grid view area. Autosized columns have minimum width of
136px, so if the area available is less than
136px for that column, it will default to that size.
When the grid is resized in these scenarios, the column width is also updated to reflect the changes, so it fills any new empty space available.
- If a column does not have specified
null, it will be sized to the minimum of
136px. This means that for a grid with
nulland 6 columns that don't have width, each column will be sized to
- When there are multiple autosized columns they will divide the available space between each other equally. This means that if we have 6 columns and there is empty area of
1200px, each will size to
- If there is available empty space, so that each autosized column will be less than
136px, all autosized columns will default to
136pxand the grid will render horizontal scrollbar. In the next example let's have 12 autosized columns and the grid
- If a column does not have
Widthspecified, but all other columns have either
Widthin pixels or percentages, that column will try to also fill the available space. For example, if we don't have width set to the first column and all other 5 have
100px, the first will fill the rest.
- Same applies if multiple columns does not have
Widthspecified, all will divide the available space between each other equally. In the next illustration the first column has
[!Note] Feature columns like Row Selector checkbox column and etc. fill additional space that is taken into account when autosizing columns.
When columns have set specific
Width in pixels, they stick to that size, unless they are resized manually. Since the combined
Width of the columns is static, it can be less than the
Width or exceed it.
- If the combined
widthof all columns is less than the
Width, there would be an empty are inside the grid that the columns wouldn't be able to fill. This is the expected behavior of the
IgbGrid. In the next example the columns have
- If the combined
Widthof all columns is bigger than the actual
Width, a horizontal scrollbar will be rendered. In the next example each of the 6 columns have width of
300pxand grid has width of
1200px, which means that the columns combined have excess of
600pxthat goes out of bounds.
When columns have set
Width in percentages, their size is calculated relatively to the grid size. It is similar to how width in pixels works, but provides also responsiveness to the columns which means that when the grid is resized, the columns also will resize accordingly.
- If the combined width of all columns is less than
100%, similarly to when in pixels, there could be an empty area of the grid that the columns do not cover.
- If the combined width is exactly
100%, the columns will fill all available space of the grid.
- If the combined width exceeds
100%in order for the user to be able to see the columns out of view, a horizontal scrollbar is rendered.
- If columns are set in percentages and the grid
Widthis set to
null, it would apply
136pxto each column. That is because the columns cannot be sized relatively to the grid, since it doesn't have
Widthitself and relies on its content to be sized when its
null. In the following example all 6 columns have
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