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Class: LabelLayer
[ AMD Module Require | Legacy Module Require ]
dojo.require("esri.layers.LabelLayer");
Description
(Added at v3.7)
NOTE: Deprecated as of version 3.14, read below for additional information on the suggested method of labeling.
The LabelLayer inherits from the graphics layer and can be used to display texts and symbols on map. It is a regular layer which can be added to the map in combination with any other feature layers.
Starting with version 3.14, labeling should be handled via the
featureLayer.setLabelingInfo() method. Also, the Map's showLabel constructor option should always be set when labeling since most of the labeling parameters are taken directly from the feature layer.
It is also possible to set the format parameters, symbols, date, etc. using the LabelClass() as seen in the sample snippet below.
Supported way to label as of version 3.14
//the snippet below shows how you should be labeling as of version 3.14
//make sure the Map's showLabels option is set to true
var map = new Map("map", {
basemap: "streets",
center:[-80, 30],
zoom: 5,
showLabels : true
});
//create featurelayer
var flayer = new FeatureLayer(url, {
outFields: ["*"] //make sure field to label is specified here in outFields
});
//create a text symbol and renderer to define the style of labels
var labelSymbol = new TextSymbol();
var json = {
"labelExpressionInfo": {"value": "{LocalTime}"},
"useCodedValues": false,
"fieldInfos": [{fieldName: "LocalTime",format: { "dateFormat": "shortDate"}}]
};
//create instance of LabelClass
var lc = new LabelClass(json);
lc.symbol = labelSymbol; // symbol also can be set in LabelClass' json
flayer.setLabelingInfo([ lc ]);
Labeling prior to version 3.14 (deprecated method)
//the snippet below shows how labeling was handled prior to version 3.14
//create instance of map
var map = new Map("map", {
basemap: "streets",
center:[-80, 30],
zoom: 5
});
var flayer = new FeatureLayer(url, {
outFields: ["*"] //make sure field to label is specified here in outFields
});
//create a text symbol and renderer to define the style of labels
var labelSymbol = new TextSymbol();
var labelRenderer = new SimpleRenderer(labelSymbol);
var labels = new LabelLayer({ id: "labels" });
labels.addFeatureLayer(flayer, labelRenderer, "{" + labelField + "}");
//add the label layer to the map
map.addLayer(labels);
For additional information showing how this can be done, please refer to the Labeling features client-side tutorial.
Samples
Search for samples that use this class.Class hierarchy
esri/layers.Layer |_esri/layers.GraphicsLayer |_esri/layers.LabelLayer
Constructors
| Name | Summary |
|---|---|
| new esri.layers.LabelLayer(params?) | Creates a new Label layer. |
Properties
| Name | Type | Summary |
|---|---|---|
| className | String | class attribute of the layer's node. |
| dataAttributes | String | String[] | List of attribute fields added as custom data attributes to graphics node. |
| graphics | Graphic[] | The array of graphics that make up the layer. |
| id | String | ID assigned to the layer. |
| infoTemplate | InfoTemplate | The info template for the layer. |
| loadError | Error | Set if the layer failed to load. |
| loaded | Boolean | When the layer is loaded, the value becomes "true", and layer properties can be accessed. |
| maxScale | Number | Maximum visible scale for the layer. |
| minScale | Number | Minimum visible scale for the layer. |
| opacity | Number | Opacity or transparency of layer. |
| refreshInterval | Number | Refresh interval of the layer in minutes. |
| renderer | Renderer | Renderer assigned to the GraphicsLayer. |
| showAttribution | Boolean | When true, the layer's attribution is displayed on the map. |
| styling | Boolean | Indicates whether the layer is responsible for styling graphics. |
| surfaceType | String | Type of vector graphics surface used to draw graphics. |
| suspended | Boolean | When true, the layer is suspended. |
| url | String | URL to the ArcGIS Server REST resource that represents a map service. |
| visible | Boolean | Visibility of the layer. |
| visibleAtMapScale | Boolean | When true, the layer is visible at the current map scale. |
Methods
| Name | Return type | Summary |
|---|---|---|
| addFeatureLayer(featureLayer, renderer?, textExpression?) | None | Adds reference to the feature layer which is labeled. |
| attr(name, value) | Layer | Adds a new attribute or changes the value of an existing attribute on the layer's node. |
| clear() | None | Clears all graphics. |
| disableMouseEvents() | None | Disables all mouse events on the graphics layer. |
| enableMouseEvents() | None | Enables all mouse events on the graphics layer. |
| getFeatureLayer(index) | FeatureLayer | Returns reference to the feature layer which features will be labeled. |
| getMap() | Map | Returns reference to the map control the layer is added to. |
| getNode() | HTMLElement | Returns the layer's DOM node. |
| hide() | None | Sets the visibility of the layer to "false". |
| isVisibleAtScale(scale) | Boolean | Returns true if the layer is visible at the given scale. |
| redraw() | None | Redraws all the graphics in the layer. |
| remove(graphic) | Graphic | Removes a graphic. |
| resume() | None | Resumes layer drawing. |
| setInfoTemplate(infoTemplate) | None | Specify or change the info template for a layer. |
| setMaxScale(scale) | None | Set the maximum scale for the layer. |
| setMinScale(scale) | None | Set the minimum scale for the layer. |
| setOpacity(opacity) | None | Initial opacity or transparency of layer. |
| setRefreshInterval(interval) | Layer | Changes the layer's refresh interval to the given value (in minutes). |
| setRenderer(renderer) | None | Sets the renderer for the graphics layer. |
| setScaleRange(minScale, maxScale) | None | Set the scale range for the layer. |
| setVisibility(isVisible) | None | Sets the visibility of the layer. |
| show() | None | Sets the visibility of the layer to "true". |
| suspend() | None | Suspends layer drawing. |
Events
[ On Style Events | Connect Style Event ]
All On Style event listeners receive a single event object. Additionally, the event object also contains a 'target' property whose value is the object which fired the event.
Events
| Name | Event Object | Summary |
|---|---|---|
| click | {
event: < | Fires when a graphic has been clicked. |
| dbl-click | Fires when a graphic has been double clicked. | |
| error | {
error: < | Fires when there is a problem retrieving a layer. |
| graphic-add | {
graphic: < | Fires when a graphic is added to the GraphicsLayer. |
| graphic-draw | {
graphic: < | Fires when a graphic is drawn. |
| graphic-node-add | {
graphic: < | Fires when a graphic's DOM node is created and added to the layer. |
| graphic-node-remove | {
graphic: < | This event is fired when a graphic's DOM node is removed (consider the node destroyed). |
| graphic-remove | {
graphic: < | Fires when a graphic is removed from the GraphicsLayer. |
| graphics-clear | Fires when all graphics in the GraphicsLayer are cleared. | |
| load | {
layer: < | Fires after layer properties for the layer are successfully populated. |
| mouse-down | <MouseEvent> mouseEvent | Fires when a mouse button is pressed down and the mouse cursor is on a graphic. |
| mouse-drag | <MouseEvent> mouseEvent | Fires while the mouse is being dragged until the mouse button is released. |
| mouse-move | <MouseEvent> mouseEvent | Fires as the mouse moves through a graphic on the GraphicsLayer. |
| mouse-out | <MouseEvent> mouseEvent | Fires as the mouse exits a graphic on the GraphicsLayer. |
| mouse-over | <MouseEvent> mouseEvent | Fires when the mouse first enters into a graphic on the GraphicsLayer. |
| mouse-up | <MouseEvent> mouseEvent | Fires when a mouse button is released and the mouse cursor is on a graphic. |
| opacity-change | {
opacity: < | Fires when the layer opacity has been changed, and returns an object with the opacity value. |
| refresh-interval-change | This event is fired when the layer's refreshInterval is modified. | |
| resume | Fires when a layer resumes drawing. | |
| scale-range-change | Fires when a layer's minScale and/or maxScale is changed. | |
| scale-visibility-change | Fires when a layer's scale visibility changes. | |
| suspend | Fires when a layer suspends drawing. | |
| update | Fires any time a layer has finished loading or updating itself. | |
| update-end | {
error: < | Fires when a layer has finished updating its content. |
| update-start | Fires when a layer begins to update its content. | |
| visibility-change | {
visible: < | Fires when the layer visibility has been changed, and returns an object with a Boolean visible property containing the new visibility value of the layer. |
Constructor Details
Creates a new Label layer.
Parameters:
< |
Optional | Constructor parameters. |
params properties: < |
Optional | ID assigned to the layer. |
< |
Optional | Display mode for the label layer. Mode Valid values are "DYNAMIC" and "STATIC". Default is "STATIC".
Starting with version 3.10, the default is to label features when a feature is visible and not continuously reposition labels. Prior to this, labels were repositioned on every map navigation event (pan or zoom). The pre-3.10 behavior of continuously re-labeling is available by specifying mode: "dynamic" when creating a label layer. |
Property Details
List of attribute fields added as custom data attributes to graphics node. Applicable only when layer
surfaceType is "svg". (Added at v3.7)<Graphic[]
Graphic[]The array of graphics that make up the layer.
<String
StringID assigned to the layer. If not assigned, esri.Map assigns value. By default, the ID of the layer is "layer" followed by a number. The ID can be user defined only in the layer constructor.
Sample:
- Setting the layer ID in the layer constructor.
population = new esri.layers.ArcGISDynamicMapServiceLayer("http://myserver/arcgis/rest/population/MapServer/Layers", {id:"population"}); - Setting the layer ID after a layer is initialized.
population.id = "population";
- Retrieving the layer ID.
function getMapLayers() { for (var j=0, jl=myMap.layerIds.length; j<jl; j++) { var currentLayer = myMap.getLayer(myMap.layerIds[j]); alert("id: " + currentLayer.id); } }
<InfoTemplate
InfoTemplateThe info template for the layer. (Added at v3.9)
<Error
ErrorSet if the layer failed to load. (Added at v3.9)
<Boolean
BooleanWhen the layer is loaded, the value becomes "true", and layer properties can be accessed. The onLoad event is also fired.
Known values:
true | false<Number
NumberMaximum visible scale for the layer. If the map is zoomed in beyond this scale, the layer will not be visible. A value of 0 means the layer does not have a maximum scale. (Added at v3.1)
Default value:
0<Number
NumberMinimum visible scale for the layer. If the map is zoomed out beyond this scale, the layer will not be visible. A value of 0 means the layer does not have a visible scale. (Added at v3.1)
Default value:
0<Number
NumberOpacity or transparency of layer. Values range from 0.0 to 1.0, where 0.0 is 100% transparent and 1.0 has no transparency.
Known values:
0.0 - 1.0Default value:
1.0<Number
NumberRefresh interval of the layer in minutes. Non-zero value indicates automatic layer refresh at the specified interval. Value of 0 indicates auto refresh is not enabled. (Added at v3.7)
<Renderer
RendererRenderer assigned to the GraphicsLayer. (Added at v1.4)
<Boolean
BooleanWhen true, the layer's attribution is displayed on the map. (Added at v3.1)
Known values:
true | falseDefault value:
true<Boolean
BooleanIndicates whether the layer is responsible for styling graphics. When
true, styling is based on graphics symbol or the layer's renderer. When false, graphics styling is disabled. Applicable only when layer surfaceType is "svg". (Added at v3.7)Known values:
true | false<String
StringType of vector graphics surface used to draw graphics. (Added at v3.7)
Known values:
"svg" | "canvas-2d" | "vml"Default value:
"svg" on all browsers - except IE8 or earlier where "vml" is used to draw graphics.<Boolean
BooleanWhen true, the layer is suspended. A layer is considered to be suspended when one of the following is true:
- The layer is hidden.
- The layer is not visible at the current map scale.
- The layer is explicitly suspended by calling the
Layer.suspendmethod.
Known values:
true | false<String
StringURL to the ArcGIS Server REST resource that represents a map service. To obtain the URL, use Services Directory. An example URL for the Street Map service on ArcGIS Online is:
http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer. (Added at v1.2)
http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer. (Added at v1.2)
<Boolean
BooleanWhen true, the layer is visible at the current map scale. (Added at v3.1)
Known values:
true | falseMethod Details
Adds reference to the feature layer which is labeled. You may add as many feature layers as you need.
Parameters:
< |
Required | The feature layer to be added to the label layer. Use FeatureLayer.MODE_ONDEMAND to improve the performance. Be sure the field(s) you would like to display is included in outFields.var featureLayer = new FeatureLayer(
"http://sampleserver6.arcgisonline.com/arcgis/rest/services/WorldTimeZones/MapServer/0",
{
mode: FeatureLayer.MODE_ONDEMAND,
outFields: ["CITY_NAME"]
}
); |
< |
Optional | The renderer used to render text labels. For most applications SimpleRenderer is best choice, but you can use UniqueValueRenderer or ClassBreaksRenderer.var renderer = new SimpleRenderer(symbol); |
< |
Optional | An expression determining what text and field(s) will be displayed as in labels. "{CITY_NAME}" |
Adds a new attribute or changes the value of an existing attribute on the layer's node. Removes the attribute if the value is
null or undefined. (Added at v3.7)Return type:
LayerClears all graphics. It is not recommended to call
clear() on a FeatureLayer as the layer automatically manages fetching (from the service) and clearing graphics based on its mode. Explicitly calling clear() to clear the graphics will interfere with the integrity of this process. For feature layers, we recommend using applyedits() to add, delete, and update features.Sample:
graphicsLayer.clear();
Returns reference to the feature layer which features will be labeled.
Return type:
FeatureLayerParameters:
< |
Required | Index of the referenced feature layer. |
Returns reference to the map control the layer is added to. Returns
null or undefined if it is not added to a map. (Added at v3.7)Return type:
MapSets the visibility of the layer to "false". The layer is not removed, but it is hidden from view.
Returns true if the layer is visible at the given scale. (Added at v3.1)
Return type:
BooleanParameters:
< |
Required | The scale at which to check if the layer is visible. |
Redraws all the graphics in the layer. This method is functionally equivalent to refresh. (Added at v3.3)
Removes a graphic. It is not recommended to call
remove() on a FeatureLayer as the layer automatically manages fetching (from the service) and clearing graphics based on its mode. Explicitly calling remove() to remove the graphics will interfere with the integrity of this process. For feature layers, we recommend using applyedits() to add, delete, and update features.Return type:
GraphicParameters:
< |
Required | The graphic to remove. |
Specify or change the info template for a layer. (Added at v2.2)
Parameters:
< |
Required | The new info template. |
Sample:
var cityLayer = new esri.layers.GraphicsLayer();
var infoTemplate = new esri.InfoTemplate("${CITY_NAME}","${*}");
cityLayer.setInfoTemplate(infoTemplate);
Set the maximum scale for the layer. (Added at v3.1)
Parameters:
< |
Required | The maximum scale at which the layer is visible. |
Set the minimum scale for the layer. (Added at v3.1)
Parameters:
< |
Required | The minimum scale at which the layer is visible. |
Initial opacity or transparency of layer. Not supported in Internet Explorer.
Parameters:
< |
Required | Value from 0 to 1, where 0 is 100% transparent and 1 has no transparency. The default value is 1. |
Changes the layer's refresh interval to the given value (in minutes). Non-zero value sets up automatic layer refresh at the specified interval. Value of 0 stops auto refresh. (Added at v3.7)
Return type:
LayerParameters:
< |
Required | Refresh interval of the layer in minutes. Non-zero value indicates automatic layer refresh at the specified interval. Value of 0 indicates auto refresh is not enabled. |
Sets the renderer for the graphics layer.
Parameters:
< |
Required | The renderer used for the graphic. |
Set the scale range for the layer. If
minScale and maxScale are set to 0 then the layer will be visible at all scales. (Added at v3.1)Sets the visibility of the layer. When true, the layer is visible.
Parameters:
< |
Required | Set the visibility of the layer. |
Event Details
[ On Style Events | Connect Style Event ]
Fires when a graphic has been clicked. Should be used in favor of onClick. (Added at v3.5)
Fires when a graphic has been double clicked. Should be used in favor of onDblClick. (Added at v3.5)
Fires when there is a problem retrieving a layer. Should be used in favor of onError. (Added at v3.5)
Event Object Properties:
< |
ArcGIS Server error message returned in a JavaScript error object. |
Fires when a graphic is added to the GraphicsLayer. Should be used in favor of onGraphicAdd. (Added at v3.5)
Event Object Properties:
< |
The added graphic. |
Fires when a graphic is drawn. A graphic is drawn or redrawn when: (Added at v3.7)
Event Object Properties:
< |
Graphic being drawn. When the layer surfaceType is "svg" or "vml", the graphic's DOM node is accessible with graphic.getNode(). |
Fires when a graphic's DOM node is created and added to the layer. Fires only when the layer surfaceType is
"svg" or "vml". (Added at v3.7)Event Object Properties:
< |
Graphic being drawn. |
< |
Graphic's DOM node. |
This event is fired when a graphic's DOM node is removed (consider the node destroyed). The DOM node of a graphic is removed when:
- Graphic is removed from the layer.
- Graphic exits the viewport on map navigation.
- When a symbol change cannot be applied to the Graphic without replacing the current node with a new one. For example: when a marker symbol is changed from SimpleMarkerSymbol to PictureMarkerSymbol, onGraphicNodeRemove will be fired for the node that is being replaced (SVG Circle) and onGraphicNodeAdd will be fired for the new node (SVG Image).
"svg" or "vml". (Added at v3.7)Event Object Properties:
< |
Graphic being drawn. |
< |
Graphic's DOM node. |
Fires when a graphic is removed from the GraphicsLayer. Should be used in favor of onGraphicRemove. (Added at v3.5)
Event Object Properties:
< |
The removed graphic. |
Fires when all graphics in the GraphicsLayer are cleared. Should be used in favor of onGraphicsClear. (Added at v3.5)
Fires after layer properties for the layer are successfully populated. This event must be successful before the layer can be added to the map. Should be used in favor of onLoad. (Added at v3.5)
Event Object Properties:
< |
The loaded layer. |
Fires when a mouse button is pressed down and the mouse cursor is on a graphic. Should be used in favor of onMouseDown. (Added at v3.5)
Event Object:
< |
A standard DOM MouseEvent with additional properties mapPoint and screenPoint. |
Fires while the mouse is being dragged until the mouse button is released. Should be used in favor of onMouseDrag. (Added at v3.5)
Event Object:
< |
A standard DOM MouseEvent with additional properties mapPoint and screenPoint. |
Fires as the mouse moves through a graphic on the GraphicsLayer. Should be used in favor of onMouseMove. (Added at v3.5)
Event Object:
< |
A standard DOM MouseEvent with additional properties mapPoint and screenPoint. |
Fires as the mouse exits a graphic on the GraphicsLayer. Should be used in favor of onMouseOut. (Added at v3.5)
Event Object:
< |
A standard DOM MouseEvent with additional properties mapPoint and screenPoint. |
Fires when the mouse first enters into a graphic on the GraphicsLayer. Should be used in favor of onMouseOver. (Added at v3.5)
Event Object:
< |
A standard DOM MouseEvent with additional properties mapPoint and screenPoint. |
Fires when a mouse button is released and the mouse cursor is on a graphic. Should be used in favor of onMouseUp. (Added at v3.5)
Event Object:
< |
A standard DOM MouseEvent with additional properties mapPoint and screenPoint. |
Fires when the layer opacity has been changed, and returns an object with the opacity value. Should be used in favor of onOpacityChange. (Added at v3.5)
Event Object Properties:
< |
Fires when the layer opacity (transparency) changes. A number property named opacity that indicates the new opacity. Values range from 0.0 to 1.0, where 0.0 is 100% transparent and 1.0 has no transparency. |
This event is fired when the layer's
refreshInterval is modified. (Added at v3.7)Fires when a layer's minScale and/or maxScale is changed. Should be used in favor of onScaleRangeChange. (Added at v3.5)
Fires when a layer's scale visibility changes. The scale visibility changes when a layer is initially visible and becomes invisible because the map scale does not intersect the layer's scale range or vice versa. Should be used in favor of onScaleVisibilityChange. (Added at v3.5)
Fires any time a layer has finished loading or updating itself.
For an ArcGISTiledMapServiceLayer,
the event fires when all required tiles have been retrieved and displayed. For an
ArcGISDynamicMapServiceLayer or
ArcGISImageServiceLayer, the event fires
when the map image has been retrieved and displayed. For a GraphicsLayer,
the event fires when all graphics have been redrawn after a pan or zoom.
Deprecated at v2.0. Use update-start and update-end instead. (Added at v3.6)
Fires when a layer has finished updating its content. It is the responsibility of the subclass to determine when this event is fired. Should be used in favor of onUpdateEnd. (Added at v3.5)
Event Object Properties:
< |
Optional argument. The error object is available when an error occurs during the update. |
Fires when a layer begins to update its content. It is the responsibility of the subclass to determine when this event is fired. Should be used in favor of onUpdateStart. (Added at v3.5)
Fires when the layer visibility has been changed, and returns an object with a Boolean visible property containing the new visibility value of the layer. Should be used in favor of onVisibilityChange. (Added at v3.5)
Event Object Properties:
< |
Fires when the layer visibility changes. A boolean property named visible indicates whether or not the layer is visible after visibility changed. |