• 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)

    NameTypeDescription
    options

    Overlay options.

    NameTypeDescription
    elementElement | undefined

    The overlay element.

    offsetArray.<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].

    positionol.Coordinate |undefined

    The overlay position in map projection.

    positioningol.OverlayPositioningstring | 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'.

    stopEventboolean | 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.

    insertFirstboolean | 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:

    Extends

    Observable Properties

    NameTypeSettableol.ObjectEvent typeDescription
    elementElement | undefinedyeschange:element

    The Element containing the overlay.

    mapol.Map | undefinedyeschange:map

    The map that the overlay is part of.

    offsetArray.<number>yeschange:offset

    The offset.

    positionol.Coordinate | undefinedyeschange:position

    The spatial point that the overlay is anchored at.

    positioningol.OverlayPositioningyeschange: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. 

    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.

    NameTypeDescription
    typestring | Array.<string>

    The event type or array of event types.

    listenerfunction

    The listener function.

    thisObject

    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.

    NameTypeDescription
    typestring | Array.<string>

    The event type or array of event types.

    listenerfunction

    The listener function.

    thisObject

    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.

    NameTypeDescription
    elementElement | undefined

    The Element containing the overlay.

    Set the map to be associated with this overlay.

    NameTypeDescription
    mapol.Map | undefined

    The map that the overlay is part of.

    setOffset(offset)

    Set the offset for this overlay.

    NameTypeDescription
    offsetArray.<number>

    Offset.

    setPosition(position)

    Set the position for this overlay.

    NameTypeDescription
    positionol.Coordinate | undefined

    The spatial point that the overlay is anchored at.

    setPositioning(positioning)

    Set the positioning for this overlay.

    NameTypeDescription
    positioningol.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.

    NameTypeDescription
    typestring | Array.<string>

    The event type or array of event types.

    listenerfunction

    The listener function.

    thisObject

    The object which was used as this by the listener.

    Removes an event listener using the key returned by on() or once().

    NameTypeDescription
    keygoog.events.Key

    Key.

    上面的内容是OL3 的API中关于overlay的部分。


    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:



    相关文章:

    OpenLayers3基础教程——OL3基本概念

    OpenLayers3基础教程——载入资源

    OpenLayers3基础教程——OL3 介绍control








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  • 原文地址:https://www.cnblogs.com/blfbuaa/p/6956729.html
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