73 lines
2.4 KiB
JavaScript
73 lines
2.4 KiB
JavaScript
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L.TileLayer.BetterWMS = L.TileLayer.WMS.extend({
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onAdd: function (map) {
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// Triggered when the layer is added to a map.
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// Register a click listener, then do all the upstream WMS things
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L.TileLayer.WMS.prototype.onAdd.call(this, map);
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map.on('click', this.getFeatureInfo, this);
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},
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onRemove: function (map) {
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// Triggered when the layer is removed from a map.
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// Unregister a click listener, then do all the upstream WMS things
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L.TileLayer.WMS.prototype.onRemove.call(this, map);
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map.off('click', this.getFeatureInfo, this);
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},
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getFeatureInfo: function (evt) {
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// Make an AJAX request to the server and hope for the best
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var url = this.getFeatureInfoUrl(evt.latlng),
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showResults = L.Util.bind(this.showGetFeatureInfo, this);
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$.ajax({
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url: url,
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success: function (data, status, xhr) {
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var err = typeof data === 'string' ? null : data;
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showResults(err, evt.latlng, data);
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},
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error: function (xhr, status, error) {
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showResults(error);
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}
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});
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},
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getFeatureInfoUrl: function (latlng) {
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// Construct a GetFeatureInfo request URL given a point
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var point = this._map.latLngToContainerPoint(latlng, this._map.getZoom()),
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size = this._map.getSize(),
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params = {
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request: 'GetFeatureInfo',
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service: 'WMS',
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srs: 'EPSG:4326',
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styles: this.wmsParams.styles,
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transparent: this.wmsParams.transparent,
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version: this.wmsParams.version,
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format: this.wmsParams.format,
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bbox: this._map.getBounds().toBBoxString(),
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height: size.y,
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width: size.x,
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layers: this.wmsParams.layers,
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query_layers: this.wmsParams.layers,
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info_format: 'text/html'
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};
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params[params.version === '1.3.0' ? 'i' : 'x'] = point.x;
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params[params.version === '1.3.0' ? 'j' : 'y'] = point.y;
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return this._url + L.Util.getParamString(params, this._url, true);
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},
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showGetFeatureInfo: function (err, latlng, content) {
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if (err) { console.log(err); return; } // do nothing if there's an error
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// Otherwise show the content in a popup, or something.
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L.popup({ maxWidth: 800})
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.setLatLng(latlng)
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.setContent(content)
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.openOn(this._map);
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}
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});
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L.tileLayer.betterWms = function (url, options) {
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return new L.TileLayer.BetterWMS(url, options);
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};
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