[英]How to make an array accessible under different functions in Javascript?
[英]how to make different vectorlayers accessible?
這是我僅使用1個VectorLayer的原始工作代碼。
<html>
<head>
<link rel="stylesheet" type="text/css" href="slova.css">
<link rel="stylesheet" type="text/css" href="blink.css"></head>
<body>
<div id="mapdiv"></div>
<script src="http://www.openlayers.org/api/OpenLayers.js"></script>
<script>
map = new OpenLayers.Map("mapdiv");
map.addLayer(new OpenLayers.Layer.OSM());
epsg4326 = new OpenLayers.Projection("EPSG:4326");
projectTo = map.getProjectionObject();
var lonLat = new OpenLayers.LonLat( 16.49679 ,43.52764 ).transform(epsg4326, projectTo);
var zoom=12;
map.setCenter (lonLat, zoom);
var vectorLayer = new OpenLayers.Layer.Vector("Overlay");
var feature = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point( 16.42253, 43.50928 ).transform(epsg4326, projectTo),
{description:'Marjan'} ,
{externalGraphic: 'img/marker.png', graphicHeight: 25, graphicWidth: 21, graphicXOffset:-12, graphicYOffset:-25 }
);
vectorLayer.addFeatures(feature);
var feature = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point( 16.56580, 43.50722 ).transform(epsg4326, projectTo),
{description:'Perun'} ,
{externalGraphic: 'img/marker.png', graphicHeight: 25, graphicWidth: 21, graphicXOffset:-12, graphicYOffset:-25 }
);
vectorLayer.addFeatures(feature);
var feature = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point( 16.40478, 43.57865 ).transform(epsg4326, projectTo),
{description:'Kozjak'},
{externalGraphic: 'img/marker.png', graphicHeight: 25, graphicWidth: 21, graphicXOffset:-12, graphicYOffset:-25 }
);
vectorLayer.addFeatures(feature);
map.addLayer(vectorLayer);
//Add a selector control to the vectorLayer with popup functions
var controls = {
selector: new OpenLayers.Control.SelectFeature(vectorLayer, { onSelect: createPopup, onUnselect: destroyPopup })
};
function createPopup(feature) {
feature.popup = new OpenLayers.Popup.FramedCloud("pop",
feature.geometry.getBounds().getCenterLonLat(),
null,
'<div class="slika"><h6>INDEKS RIZIKA POŽARA RASLINJA</h6><div class="container"><div class="panel rizik1 "><h1>VRLO MALA</h1></div><div class="panel rizik2"><h2>MALA</h2></div><div class="panel rizik3"><h3>UMJERENA</h3></div><div class="panel rizik4 blink_me"><h4>VELIKA</h4></div><div class="panel rizik5"><h5>VRLO VELIKA</h5></div></div></div>',
null,
true,
function() { controls['selector'].unselectAll(); }
);
//feature.popup.closeOnMove = true;
map.addPopup(feature.popup);
}
function destroyPopup(feature) {
feature.popup.destroy();
feature.popup = null;
}
map.addControl(controls['selector']);
controls['selector'].activate();
</script>
</body></html>
如這里所見 。
我試圖通過添加新的圖層和標記來更改這些標記之一的彈出內容。 新代碼如下所示:
<html>
<head><title>Indeks opasnosti</title>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<link rel="stylesheet" type="text/css" href="slova.css">
<link rel="stylesheet" type="text/css" href="blink.css"></head>
<body>
<div id="mapdiv"></div>
<script src="http://www.openlayers.org/api/OpenLayers.js"></script>
<script>
map = new OpenLayers.Map("mapdiv");
map.addLayer(new OpenLayers.Layer.OSM());
epsg4326 = new OpenLayers.Projection("EPSG:4326"); //WGS 1984 projection
projectTo = map.getProjectionObject(); //The map projection (Spherical Mercator)
var lonLat = new OpenLayers.LonLat( 16.49679 ,43.52764 ).transform(epsg4326, projectTo);
var zoom=12;
map.setCenter (lonLat, zoom);
var vectorLayer = new OpenLayers.Layer.Vector("Overlay");
var vectorLayer1 = new OpenLayers.Layer.Vector("Overlay");
// Define markers as "features" of the vector layer:
var feature = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point( 16.42253, 43.50928 ).transform(epsg4326, projectTo),
{description:'Marjan'} ,
{externalGraphic: 'img/marker.png', graphicHeight: 25, graphicWidth: 21, graphicXOffset:-12, graphicYOffset:-25 }
);
vectorLayer.addFeatures(feature);
var feature = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point( 16.56580, 43.50722 ).transform(epsg4326, projectTo),
{description:'Perun'} ,
{externalGraphic: 'img/marker.png', graphicHeight: 25, graphicWidth: 21, graphicXOffset:-12, graphicYOffset:-25 }
);
vectorLayer.addFeatures(feature);
var feature1 = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point( 16.40478, 43.57865 ).transform(epsg4326, projectTo),
{description:'Kozjak'},
{externalGraphic: 'img/marker.png', graphicHeight: 25, graphicWidth: 21, graphicXOffset:-12, graphicYOffset:-25 }
);
vectorLayer1.addFeatures(feature1);
map.addLayer(vectorLayer);
map.addLayer(vectorLayer1);
var controls = {
selector: new OpenLayers.Control.SelectFeature(vectorLayer, { onSelect: createPopup, onUnselect: destroyPopup })
};
var controls1 = {
selector: new OpenLayers.Control.SelectFeature(vectorLayer1, { onSelect: createPopup, onUnselect: destroyPopup })
};
function createPopup(feature) {
feature.popup = new OpenLayers.Popup.FramedCloud("pop",
feature.geometry.getBounds().getCenterLonLat(),
null,
'<div class="slika"><h6>INDEKS RIZIKA POŽARA RASLINJA</h6><div class="container"><div class="panel rizik1 "><h1>VRLO MALA</h1></div><div class="panel rizik2"><h2>MALA</h2></div><div class="panel rizik3"><h3>UMJERENA</h3></div><div class="panel rizik4 blink_me"><h4>VELIKA</h4></div><div class="panel rizik5"><h5>VRLO VELIKA</h5></div></div></div>',
null,
true,
function() { controls['selector'].unselectAll(); }
);
map.addPopup(feature.popup);
}
function createPopup(feature1) {
feature1.popup = new OpenLayers.Popup.FramedCloud("pop",
feature1.geometry.getBounds().getCenterLonLat(),
null,
'<div class="slika"><h6>INDEKS RIZIKA POŽARA RASLINJA</h6><div class="container"><div class="panel rizik1 "><h1>VRLO MALA</h1></div><div class="panel rizik2 blink_me"><h2>MALA</h2></div><div class="panel rizik3"><h3>UMJERENA</h3></div><div class="panel rizik4 blink_me"><h4>VELIKA</h4></div><div class="panel rizik5"><h5>VRLO VELIKA</h5></div></div></div>',
null,
true,
function() { controls1['selector'].unselectAll(); }
);
map.addPopup(feature1.popup);
}
function destroyPopup(feature) {
feature.popup.destroy();
feature.popup = null;
}
function destroyPopup(feature1) {
feature1.popup.destroy();
feature1.popup = null;
}
map.addControl(controls['selector']);
controls['selector'].activate();
map.addControl(controls1['selector']);
controls1['selector'].activate();
</script>
</body></html>
但是正如您在這里看到的那樣,它無法正常工作。它僅顯示索引為#1的元素。我該怎么做才能同時顯示feature和feature1?
首先,如果兩次定義相同名稱的函數,則只需覆蓋第一個聲明。 createPopup和detroyPopup就是這種情況。
無論如何,OpenLayers.Control.SelectFeature控件接受一個或多個矢量層作為第一個參數。 因此,您可以在兩個圖層上使用單個控件,例如: new OpenLayers.Control.SelectFeature([vectorLayer, vectorLayer1], { onSelect: createPopup, onUnselect: destroyPopup })
但是,我認為使用多層以上不是滿足您需求的正確解決方案(如果我理解正確的話!)。
我認為您應該將所有功能添加到單個圖層,並使用屬性來識別它們(“描述”就可以)。
然后,您可以為每個功能使用不同的html創建彈出窗口,如下所示:
<code><pre>
function createPopup(feature) {
var html;
if(feature.attributes.description == 'Marjan') {
html = '<div class="slika"><h6>....</div>';
} else if(feature.attributes.description == 'Kozjak') {
html = '<div class="slika"><h6>....</div>';
}
feature.popup = new OpenLayers.Popup.FramedCloud("pop",
feature.geometry.getBounds().getCenterLonLat(),
null,
html,
null,
true,
function() { controls['selector'].unselectAll(); }
);
map.addPopup(feature.popup);
}
</pre></code>
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