OpenLayers3基础教程——OL3之Popup
OpenLayers3基础教程——OL3之Popup
概述：
本节重点讲述OpenLayers3中Popup的调用时实现，OL3改用Overlay代替OL2的Popup功能。
接口简介：
overlay跟ol.control.Control一样，是一个可见的窗口，但是不和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。其调用方式如下：
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.NameTypeDescriptionelementElement | undefinedThe overlay element.offsetArray.<number> |undefinedOffsets in pixels used when positioning the overlay. The fist element in the array is the horizontal offset. A positive value shifts the overlay right. The second element in the array is the vertical offset. A positive value shifts the overlay down. Default is [0, 0].positionol.Coordinate |undefinedThe overlay position in map projection.positioningol.OverlayPositioning| string | undefinedDefines how the overlay is actually positioned with respect to its position property. Possible values are'bottom-left', 'bottom-center', 'bottom-right', 'center-left', 'center-center','center-right', 'top-left', 'top-center', and 'top-right'. Default is 'top-left'.stopEventboolean | undefinedWhether event propagation to the map viewport should be stopped. Default is true. If true the overlay is placed in the same container as that of the controls (CSS class name ol-overlaycontainer-stopevent); iffalse it is placed in the container with CSS class name ol-overlaycontainer.insertFirstboolean | undefinedWhether the overlay is inserted first in the overlay container, or appended. Default is true. If the overlay is placed in the same container as that of the controls (see the stopEvent option) you will probably setinsertFirst to true so the overlay is displayed below the controls. | Name | Type | Description | element | Element | undefined | The overlay element. | offset | Array.<number> |undefined | Offsets in pixels used when positioning the overlay. The fist element in the array is the horizontal offset. A positive value shifts the overlay right. The second element in the array is the vertical offset. A positive value shifts the overlay down. Default is [0, 0]. | position | ol.Coordinate |undefined | The overlay position in map projection. | positioning | ol.OverlayPositioning| string | undefined | Defines how the overlay is actually positioned with respect to its position property. Possible values are'bottom-left', 'bottom-center', 'bottom-right', 'center-left', 'center-center','center-right', 'top-left', 'top-center', and 'top-right'. Default is 'top-left'. | stopEvent | boolean | undefined | Whether event propagation to the map viewport should be stopped. Default is true. If true the overlay is placed in the same container as that of the controls (CSS class name ol-overlaycontainer-stopevent); iffalse it is placed in the container with CSS class name ol-overlaycontainer. | insertFirst | boolean | undefined | Whether the overlay is inserted first in the overlay container, or appended. Default is true. If the overlay is placed in the same container as that of the controls (see the stopEvent option) you will probably setinsertFirst to true so the overlay is displayed below the controls. | |
Name | Type | Description | |||||||||||||||||||||
element | Element | undefined | The overlay element. | |||||||||||||||||||||
offset | Array.<number> |undefined | Offsets in pixels used when positioning the overlay. The fist element in the array is the horizontal offset. A positive value shifts the overlay right. The second element in the array is the vertical offset. A positive value shifts the overlay down. Default is [0, 0]. | |||||||||||||||||||||
position | ol.Coordinate |undefined | The overlay position in map projection. | |||||||||||||||||||||
positioning | ol.OverlayPositioning| string | undefined | Defines how the overlay is actually positioned with respect to its position property. Possible values are'bottom-left', 'bottom-center', 'bottom-right', 'center-left', 'center-center','center-right', 'top-left', 'top-center', and 'top-right'. Default is 'top-left'. | |||||||||||||||||||||
stopEvent | boolean | undefined | Whether event propagation to the map viewport should be stopped. Default is true. If true the overlay is placed in the same container as that of the controls (CSS class name ol-overlaycontainer-stopevent); iffalse it is placed in the container with CSS class name ol-overlaycontainer. | |||||||||||||||||||||
insertFirst | boolean | undefined | Whether the overlay is inserted first in the overlay container, or appended. Default is true. If the overlay is placed in the same container as that of the controls (see the stopEvent option) you will probably setinsertFirst to true so the overlay is displayed below the controls. | |||||||||||||||||||||
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 in listener. |
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 in listener. |
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 the listener. |
unByKey(key) inherited
src/ol/observable.js, line 101
Removes an event listener using the key returned by on() or once().
Name | Type | Description |
|---|---|---|
key | goog.events.Key | Key. |
上面的内容是OL3 的API中关于overlay的部分。
调用示例：
1、popup样式
body, #map {
border: 0px;
margin: 0px;
padding: 0px;
width: 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;
width: 200px;
}
.ol-popup:after, .ol-popup:before {
top: 100%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
}
.ol-popup:after {
border-top-color: white;
border-width: 10px;
left: 48px;
margin-left: -10px;
}
.ol-popup:before {
border-top-color: #cccccc;
border-width: 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);
});示例完整代码如下：
<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;
width: 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;
width: 200px;
}
.ol-popup:after, .ol-popup:before {
top: 100%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
}
.ol-popup:after {
border-top-color: white;
border-width: 10px;
left: 48px;
margin-left: -10px;
}
.ol-popup:before {
border-top-color: #cccccc;
border-width: 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>实现后的效果如下：
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