17.2.7. The Attribute Table Item¶
Any layer in the project can have its attributes shown in the print layout. You can use this to decorate and explain your map with information about underlying data. Use the Add Attribute Table tool following items creation instructions to add a new map item that you can later manipulate the same way as exposed in Interacting with layout items.
By default, a new attribute table item loads first rows of the first (alphabetically sorted) layer, with all the fields. You can however customize the table thanks to its Item Properties panel. Other than the items common properties, this feature has the following functionalities (see figure_layout_table):
The Main properties group of the attribute table provides the following functionalities (see figure_layout_table_ppt):
For Source you can by default only select Layer features allowing you to select a Layer from the vector layers loaded in the project.
The data-defined override button near the layer list allows you to dynamically change the layer which is used to populate the table, e.g. you could fill the attribute table with different layer attributes per atlas page. Note that the table structure used (图 17.40) is the one of the layer shown in the Layer drop-down list and it is left intact, meaning that setting a data defined table to a layer with different field(s) will result in empty column(s) in the table.
In case you activate the Generate an atlas option in the Atlas panel (see Generate an Atlas), there are two additional Source possible:
Current atlas feature (see figure_layout_table_atlas): you won't see any option to choose the layer, and the table item will only show a row with the attributes from the current feature of the atlas coverage layer.
and Relation children (see figure_layout_table_relation): an option with the relation names will show up. This feature can only be used if you have defined a relation using your atlas coverage layer as parent, and the table will show the children rows of the atlas coverage layer's current feature.
The button Refresh Table Data can be used to refresh the table when the actual contents of the table has changed.
The button Attributes... starts the Select Attributes dialog, (see figure_layout_table_select) that can be used to change the visible contents of the table. The upper part of the window shows the list of the attributes to display and the lower part helps you sort the data.
In the Columns section you can:
Reset the attribute table back to its default state with the Reset button.
Clear the table using the Clear button. This is useful when you have a large table but only want to show a small number of attributes. Instead of manually removing each row, it may be quicker to clear the table and add the rows needed.
Cell headings can be altered by adding the custom text in the Heading column.
Cell alignment can be managed with the Alignment column which will dictate the texts position within the table cell.
Cell width can be manually managed by adding custom values to the width column.
In the Sorting section you can:
The Feature filtering group of the attribute table provides the following functionalities (see figure_layout_table_filter):
Define the Maximum rows to be displayed.
Activate Show only features intersecting Atlas feature is only available when Generate an atlas is activated. When activated it will show a table with only the features which intersect the current atlas feature.
Activate Filter with and provide a filter by typing in the input line or insert a regular expression using the given expression button. A few examples of filtering statements you can use when you have loaded the airports layer from the Sample dataset:
ELEV > 500
NAME = 'ANIAK'
NAME NOT LIKE 'AN%'
regexp_match( attribute( $currentfeature, 'USE' ) , '[i]')
The last regular expression will include only the airports that have a letter 'i' in the attribute field 'USE'.
The Appearance group of the attribute table provides the following functionalities (see figure_layout_table_appearance):
With Cell margins you can define the margin around text in each cell of the table.
With Display header you can select from a list one of 'On first frame', 'On all frames' default option, or 'No header'.
The option Empty table controls what will be displayed when the result selection is empty.
Draw headers only, will only draw the header except if you have chosen 'No header' for Display header.
Show set message, will draw the header and adds a cell spanning all columns and display a message like 'No result' that can be provided in the option Message to display
The option Message to display is only activated when you have selected Show set message for Empty table. The message provided will be shown in the table in the first row, when the result is an empty table.
With Background color you can set the background color of the table using the color selector widget. The Advanced customization option helps you define different background colors for each cell (see figure_layout_table_background)
With the Wrap text on option, you can define a character on which the cell content will be wraped each time it is met
With Oversized text you define the behavior when the width set for a column is smaller than its content's length. It can be Wrap text or Truncate text.
The Show grid group of the attribute table provides the following functionalities (see figure_layout_table_grid):
With Line width you can set the thickness of the lines used in the grid.
The Color of the grid can be set using the color selection widget.
The Fonts and text styling group of the attribute table provides the following functionalities (see figure_layout_table_fonts):
You can define Font and Color for Table heading and Table contents, using font and color selector widgets.
For Table heading you can additionally set the Alignment to
Follow column alignmentor override this setting by choosing
Right. The column alignment is set using the Select Attributes dialog (see figure_layout_table_select ).
The Frames group of the attribute table properties provides the following functionalities (see figure_layout_table_frames):
With Resize mode you can select how to render the attribute table contents:
Use existing framesdisplays the result in the first frame and added frames only.
Extend to next pagewill create as many frames (and corresponding pages) as necessary to display the full selection of attribute table. Each frame can be moved around on the layout. If you resize a frame, the resulting table will be divided up between the other frames. The last frame will be trimmed to fit the table.
Repeat until finishedwill also create as many frames as the Extend to next page option, except all frames will have the same size.
Use the Add Frame button to add another frame with the same size as selected frame. The result of the table that will not fit in the first frame will continue in the next frame when you use the Resize mode
Use existing frames.
Activate Don't export page if frame is empty prevents the page to be exported when the table frame has no contents. This means all other layout items, maps, scalebars, legends etc. will not be visible in the result.