Label or style a feature layer with a range of percentages using ArcGIS Arcade in Map Viewer

Summary

In ArcGIS Online and Portal for ArcGIS Map Viewer, it is helpful to style or label numeric data in a feature layer using a range of percentages for better data management. In this article, an Arcade expression is used to create labels or style a feature layer with the desired range of percentages.

Procedure

Display the percentage range with labels

1. Open the web map in Map Viewer and select the feature layer.
2. On the Settings (light) toolbar, click Labels . Enable the labels by toggling Enable labels on.
3. In the Label features pane, click Add label class. Under Label field, click Use expression .
4. In the editor window, configure the expressions below.
   1. Replace <variable_name> with the desired variable name. In this example, 'ratio' is used.
   2. Replace <field_name> with the field's name to display the range of percentages with labels. In this example, 'Accident_Ratio' is selected.
   3. Replace <field_value> with the desired field’s values from the attribute table.
   4. Replace <range of percentages> with the desired text for the labels.

var <variable_name> = $feature.<field_name>

if (<variable_name> <=<field_value>) {
    return "<range of percentage>";
} else if (<variable_name> <=<field_value> ) {
    return "<range of percentage>";
} else if (<variable_name> <=<field_value> ) {
    return "<range of percentage>";
} else {
    return "<range of percentage>";
}

Note:
The numbers for the range can be specified as per the requirements of the field’s attribute value.

5. Click Done.

The web map below shows the range of percentages for the field displayed with labels.

Display the range of percentages with unique symbols

1. Open the web map in Map Viewer and select the feature layer.
2. On the Settings (light) toolbar, click Styles .
3. In the Styles pane, for Choose attributes, click Expression.
4. In the editor window, configure the expressions below.
   1. Replace <variable_name> with the desired variable name. In this example, 'ratio' is used.
   2. Replace <field_name> with the field's name to display the range of percentages. In this example, 'Accident_Ratio' is selected.
   3. Replace <field_value> with the desired field’s values from the attribute table.
   4. Replace <range of percentages> with the desired text for the legend.

var <variable_name> = $feature.<field_name>

if (<variable_name> <=<field_value>) {
    return "<range of percentage>";
} else if (<variable_name> <=<field_value> ) {
    return "<range of percentage>";
} else if (<variable_name> <=<field_value> ) {
    return "<range of percentage>";
} else {
    return "<range of percentage>";
}

Note:
The numbers for the range can be specified as per the requirements of the field’s attribute value.

5. Click Done.

6. In the Styles pane, for Pick a style, select Types (unique symbols).
7. In the Styles pane, click Done.
8. Display the legend representing the range of percentages for the values of the field. Refer to ArcGIS Online: View a legend (Map Viewer) or Portal for ArcGIS: View a legend (Map Viewer) for instructions.

The web map below shows the range of percentages represented through the unique symbols in the legend.