[英]Am I calling the JavaScript file correctly?
我有一個網頁,我想知道我是否正確調用了javascript3.js
。 該文件與html位於同一文件夾內。 當我將javascript代碼放入html時,效果很好。
( ol3-layerswitcher.js
被正確調用,所以我不知道為什么另一個未被調用。)
HTML:
<!DOCTYPE html>
<html>
<head>
<title>Map</title>
<link rel="stylesheet" href="http://openlayers.org/en/v3.12.1/css/ol.css">
<link rel="stylesheet" href="ol3-layerswitcher.css">
<script src="http://openlayers.org/en/v3.12.1/build/ol.js"></script>
<script src="ol3-layerswitcher.js"></script>
<script src="javascript3.js"></script>
</head>
<body>
<div id="map" style="width:100%;"></div>
<div id="info"></div>
</body>
</html>
javascript3.js:
var testSource = new ol.source.TileWMS({
url: 'http://localhost:8080/geoserver/wms',
params: {'LAYERS': 'Marine:Great_Britain', 'TILED': true},
serverType: 'geoserver'
});
var layers = [
new ol.layer.Tile({
source: new ol.source.MapQuest({layer: 'osm'})
}),
new ol.layer.Group({
title: 'Layers',
layers: [
//Implementing layers
new ol.layer.Tile({
title: 'Great Britain',
source: testSource
}),
]
})
];
var map = new ol.Map({
layers: layers,
target: 'map',
view: new ol.View({
center: [51480.6, 7216744.2], //UK
zoom: 5
})
});
//Function to get features from layer
map.on('singleclick', function(evt) {
document.getElementById('info').innerHTML = '';
viewResolution = map.getView().getResolution();
var url = testSource.getGetFeatureInfoUrl(
evt.coordinate, viewResolution, 'EPSG:3857',
{'INFO_FORMAT': 'text/html'});
if (url) {
document.getElementById('info').innerHTML =
'<iframe seamless src="' + url + '"></iframe>';
}
});
//Layer switcher to turn layers on and off
var layerSwitcher = new ol.control.LayerSwitcher({
tipLabel: 'Legend'
});
map.addControl(layerSwitcher);
如果您需要執行DOM操作而不將代碼包裝到文檔就緒處理程序中 (例如$(document).ready();
),則正確的位置應位於body
的末尾(或至少在創建要操作的DOM元素之后) ):
<!DOCTYPE html>
<html>
<head>
<title>Map</title>
<link rel="stylesheet" href="http://openlayers.org/en/v3.12.1/css/ol.css">
<link rel="stylesheet" href="ol3-layerswitcher.css">
<script src="http://openlayers.org/en/v3.12.1/build/ol.js"></script>
<script src="ol3-layerswitcher.js"></script>
</head>
<body>
<div id="map" style="width:100%;"></div>
<div id="info"></div>
<script src="javascript3.js"></script>
</body>
</html>
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