概述:
本节重点讲述OpenLayers3中Popup的调用时实现,OL3改用Overlay取代OL2的Popup功能。
接口简单介绍:
overlay跟ol.control.Control一样,是一个可见的窗体,可是不和Control一样,不是固定在地图区域的某个部分,而是显示在一个地图坐标上,随着地图的移动或者缩放而移动的。其调用方式例如以下:
var popup = new ol.Overlay({ element: document.getElementById('popup') }); popup.setPosition(coordinate); map.addOverlay(popup);
new ol.Overlay(options)
Name | Type | Description | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
options | Overlay options.
|
Fires:
change:element
(ol.ObjectEvent)change:map
(ol.ObjectEvent)change:offset
(ol.ObjectEvent)change:position
(ol.ObjectEvent)change:positioning
(ol.ObjectEvent)
Extends
Observable Properties
Name | Type | Settable | ol.ObjectEvent type | Description |
---|---|---|---|---|
element | Element | undefined | yes | change:element | The Element containing the overlay. |
map | ol.Map | undefined | yes | change:map | The map that the overlay is part of. |
offset | Array.<number> | yes | change:offset | The offset. |
position | ol.Coordinate | undefined | yes | change:position | The spatial point that the overlay is anchored at. |
positioning | ol.OverlayPositioning | yes | change:positioning | How the overlay is positioned relative to its point on the map. |
Methods
getElement(){Element|undefined}
Get the DOM element of this overlay.
Returns:
The Element containing the overlay.getMap(){ol.Map|undefined}
Get the map associated with this overlay.
Returns:
The map that the overlay is part of.getOffset(){Array.<number>}
Get the offset of this overlay.
Returns:
The offset.getPosition(){ol.Coordinate|undefined}
Get the current position of this overlay.
Returns:
The spatial point that the overlay is anchored at.getPositioning(){ol.OverlayPositioning}
Get the current positioning of this overlay.
Returns:
How the overlay is positioned relative to its point on the map.on(type, listener, opt_this){goog.events.Key} inherited
Listen for a certain type of event.
Name Type Description type
string | Array.<string> The event type or array of event types.
listener
function The listener function.
this
Object The object to use as
this
inlistener
.Returns:
Unique key for the listener.once(type, listener, opt_this){goog.events.Key} inherited
Listen once for a certain type of event.
Name Type Description type
string | Array.<string> The event type or array of event types.
listener
function The listener function.
this
Object The object to use as
this
inlistener
.Returns:
Unique key for the listener.setElement(element)
Set the DOM element to be associated with this overlay.
Name Type Description element
Element | undefined The Element containing the overlay.
setMap(map)
Set the map to be associated with this overlay.
Name Type Description map
ol.Map | undefined The map that the overlay is part of.
setOffset(offset)
Set the offset for this overlay.
Name Type Description offset
Array.<number> Offset.
setPosition(position)
Set the position for this overlay.
Name Type Description position
ol.Coordinate | undefined The spatial point that the overlay is anchored at.
setPositioning(positioning)
Set the positioning for this overlay.
Name Type Description positioning
ol.OverlayPositioning how the overlay is positioned relative to its point on the map.
un(type, listener, opt_this) inherited
Unlisten for a certain type of event.
Name Type Description type
string | Array.<string> The event type or array of event types.
listener
function The listener function.
this
Object The object which was used as
this
by thelistener
.unByKey(key) inherited
Removes an event listener using the key returned by
on()
oronce()
.Name Type Description key
goog.events.Key Key.
调用演示样例:
1、popup样式
body, #map { border: 0px; margin: 0px; padding: 0px; 100%; height: 100%; font-size: 13px; } .ol-popup { display: none; position: absolute; background-color: white; -moz-box-shadow: 0 1px 4px rgba(0,0,0,0.2); -webkit-filter: drop-shadow(0 1px 4px rgba(0,0,0,0.2)); filter: drop-shadow(0 1px 4px rgba(0,0,0,0.2)); border: 1px solid #cccccc; bottom: 12px; left: -50px; 200px; } .ol-popup:after, .ol-popup:before { top: 100%; border: solid transparent; content: " "; height: 0; 0; position: absolute; pointer-events: none; } .ol-popup:after { border-top-color: white; border- 10px; left: 48px; margin-left: -10px; } .ol-popup:before { border-top-color: #cccccc; border- 11px; left: 48px; margin-left: -11px; } .popup-title{ font-weight: bold; border-bottom:1px solid #cccccc; padding: 5px 8px; } .popup-content{ padding: 5px 8px; } .ol-popup-closer { text-decoration: none; position: absolute; top: 6px; right: 6px; } .ol-popup-closer:after { content: "✖"; }2、popup容器
<div id="map"> <div id="popup" class="ol-popup"> <a href="#" id="popup-closer" class="ol-popup-closer"></a> <div id="popup-title" class="popup-title"></div> <div id="popup-content" class="popup-content"></div> </div> </div>3、实现js
var container = document.getElementById('popup'); var content = document.getElementById('popup-content'); var title = document.getElementById('popup-title'); var closer = document.getElementById('popup-closer'); closer.onclick = function(){ container.style.display = 'none'; closer.blur(); return false; }; var overlay = new ol.Overlay({ element: container }); map.addOverlay(overlay);
map.on('click', function(evt) { var coordinate = evt.coordinate; var hdms = ol.coordinate.toStringHDMS(ol.proj.transform( coordinate, 'EPSG:4326', 'EPSG:4326')); overlay.setPosition(coordinate); content.innerHTML = '<p>You clicked here:</p><code>' + hdms + '</code>'; container.style.display = 'block'; title.innerHTML = "提示信息"; title.style.display = 'block'; map.getView().setCenter(coordinate); });
演示样例完整代码例如以下:
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Ol3 popup</title> <link rel="stylesheet" type="text/css" href="http://localhost/ol3/css/ol.css"/> <style type="text/css"> body, #map { border: 0px; margin: 0px; padding: 0px; 100%; height: 100%; font-size: 13px; } .ol-popup { display: none; position: absolute; background-color: white; -moz-box-shadow: 0 1px 4px rgba(0,0,0,0.2); -webkit-filter: drop-shadow(0 1px 4px rgba(0,0,0,0.2)); filter: drop-shadow(0 1px 4px rgba(0,0,0,0.2)); border: 1px solid #cccccc; bottom: 12px; left: -50px; 200px; } .ol-popup:after, .ol-popup:before { top: 100%; border: solid transparent; content: " "; height: 0; 0; position: absolute; pointer-events: none; } .ol-popup:after { border-top-color: white; border- 10px; left: 48px; margin-left: -10px; } .ol-popup:before { border-top-color: #cccccc; border- 11px; left: 48px; margin-left: -11px; } .popup-title{ font-weight: bold; border-bottom:1px solid #cccccc; padding: 5px 8px; } .popup-content{ padding: 5px 8px; } .ol-popup-closer { text-decoration: none; position: absolute; top: 6px; right: 6px; } .ol-popup-closer:after { content: "✖"; } </style> <script type="text/javascript" src="http://localhost/ol3/build/ol.js"></script> <script type="text/javascript" src="http://localhost/jquery/jquery-1.8.3.js"></script> <script type="text/javascript"> function init(){ var format = 'image/png'; var bounds = [73.4510046356223, 18.1632471876417, 134.976797646506, 53.5319431522236]; var untiled = new ol.layer.Image({ source: new ol.source.ImageWMS({ ratio: 1, url: 'http://localhost:8081/geoserver/lzugis/wms', params: {'FORMAT': format, 'VERSION': '1.1.1', LAYERS: 'lzugis:capital', STYLES: '' } }) }); var projection = new ol.proj.Projection({ code: 'EPSG:4326', units: 'degrees' }); var container = document.getElementById('popup'); var content = document.getElementById('popup-content'); var title = document.getElementById('popup-title'); var closer = document.getElementById('popup-closer'); closer.onclick = function(){ container.style.display = 'none'; closer.blur(); return false; }; var overlay = new ol.Overlay({ element: container }); map.addOverlay(overlay); var map = new ol.Map({ controls: ol.control.defaults({ attribution: false }), target: 'map', layers: [untiled], overlays: [overlay], view: new ol.View({ projection: projection }) }); map.getView().fitExtent(bounds, map.getSize()); map.on('click', function(evt) { var coordinate = evt.coordinate; var hdms = ol.coordinate.toStringHDMS(ol.proj.transform( coordinate, 'EPSG:4326', 'EPSG:4326')); overlay.setPosition(coordinate); content.innerHTML = '<p>You clicked here:</p><code>' + hdms + '</code>'; container.style.display = 'block'; title.innerHTML = "提示信息"; title.style.display = 'block'; map.getView().setCenter(coordinate); }); } </script> </head> <body onLoad="init()"> <div id="map"> <div id="popup" class="ol-popup"> <a href="#" id="popup-closer" class="ol-popup-closer"></a> <div id="popup-title" class="popup-title"></div> <div id="popup-content" class="popup-content"></div> </div> </div> </body> </html>
实现后的效果例如以下:
OpenLayers3基础教程——OL3 介绍control