# Labels Labels are texts associated with map features. They are used to display information about features directly on the map. For example, you can use labels to show city names from a point layer representing urban areas. The **Labels** section, accessible via the ![](https://3291879974-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9n1KCuTyIKwSpZcPcC6l%2Fuploads%2F5Sqas23vDZ3Bf7WaIWol%2Fstudio-couche-etiquette.png?alt=media\&token=9f089d16-f8d2-48eb-bde4-bbcc084e71df), allows you to configure the content, style, and display settings of labels for the layer's features.


1	Activate labels Check this box to display labels by default in JMap NG.
2	Font Click this button to select the label text style: font, font size, bold, italic, font color, outline, and outline color.
3	Area for writing the label content. The Label content section provides details on this topic.
4	Attributes Available attributes for labels. These are the layer attributes that you select in the Layer Properties section.
5	Functions Functions available for labels. The Label content section details these functions.
6	Zoom levels Zoom levels range at which labels are displayed. Define the range by dragging the indicators on the bar or by entering the minimum and maximum zoom values for the range.
7	Position Determine the position of the label relative to the element. Click to select the position from the nine possible options. Allow overlapping Check the box to allow the labels of the layer to overlap the labels of other layers. This option can be useful to ensure that all labels of this layer are displayed. Follow the line Only for line elements. Check the box to display the label text along the lines. Spacing (pixels) Only for line elements. Specify the spacing (in pixels) between repeated labels on the same line.
8	Offset (pixel) Set the offset in pixels and on both dimensions of the label's position relative to the element.
9	Frame Check the box to add a frame to the label text. Select the background and countour color for the frame.
10	Rotation If you check Rotation using an attribute, select the numeric attribute whose values will be used as the rotation angle and the rotation direction. Only for line elements. If you check Follow map rotation, labels will follow the map rotation.
11	Proportional size By default, label text is always displayed at the specified font size, independently of the zoom level of the map. Check this option to have the label text size adjusted proportionally to the zoom level of the map. Drag the point in the bar to select the reference zoom level at which text is displayed at the specified font size. When the zoom level of the map changes, the text size is modified accordingly.
12	Click on the language of your choice to enter the label content in the selected language.

## Label Content Labeling is done by defining the text that will appear as the label. This text can span multiple lines and contain: * static content (unchanging), * dynamic functions (variables), which are automatically replaced with their results when displayed. The available **functions** are:


ev(attrib) attrib : the name of an attribute	This function is replaced by the value of the bound attribute whose name is passed as a parameter for the pointed element. Example `ev(id)` Label displays the value of the id attribute for this element.
ifNull(attrib, value) attrib : the name of the attribute to test value : the value to display if attrib is null	This function is replaced by the value value only if the value of the attrib attribute is null. If the attribute value is not null, nothing is displayed. Example `ifNull(temp, N/A)` Displays N/A if the value of the temp attribute is null. Example `ifNull(attrib_a, attrib_b)` Displays the value of the attrib_b attribute if the value of the attrib_aattribute is null.
ifNotNull(attrib, value) attrib : the name of the attribute to test value : the value to display if attrib is not null	This function is replaced by the value value only if the value of the attrib attribute is not null. If the attribute value is null, nothing is displayed. Example `ifNotNull(land_value, $)` Displays $ only if the value of land_value is not null.

ev(attrib)
attrib : the name of an attribute

This function is replaced by the value of the bound attribute whose name is passed as a parameter for the pointed element.
Example
ev(id)

Label displays the value of the id attribute for this element.

ifNull(attrib, value)
attrib : the name of the attribute to test
value : the value to display if attrib is null This function is replaced by the value value only if the value of the attrib attribute is null.
If the attribute value is not null, nothing is displayed.
Example
ifNull(temp, N/A)
Displays N/A if the value of the temp attribute is null.
Example
ifNull(attrib_a, attrib_b)
Displays the value of the attrib_b attribute if the value of the attrib_aattribute is null.

ifNotNull(attrib, value)
attrib : the name of the attribute to test
value : the value to display if attrib is not null This function is replaced by the value value only if the value of the attrib attribute is not null.
If the attribute value is null, nothing is displayed.
Example
ifNotNull(land_value, $)
Displays $ only if the value of land_value is not null.

The usable attributes are shown in the **Attributes** section. **To configure label content**: 1. Enter the desired static text. 2. To insert dynamic content, place the cursor at the appropriate position in the text area. 3. Click the function you want to use. It will be added instantly, and a menu will appear showing the available attributes for that function. 4. Select the attribute and enter a value if needed. 5. Click

to save the label content.