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// use a CQL parser for easy filter creation
var format = new OpenLayers.Format.CQL();
// this rule will get a filter from the CQL text in the form
var rule = new OpenLayers.Rule({
// We could also set a filter here. E.g.
// filter: format.read("STATE_ABBR >= 'B' AND STATE_ABBR <= 'O'"),
symbolizer: {
fillColor: "#ff0000",
strokeColor: "#ffcccc",
fillOpacity: "0.5"
}
});
var states = new OpenLayers.Layer.Vector("States", {
styleMap: new OpenLayers.StyleMap({
"default": new OpenLayers.Style(null, {rules: [rule]})
})
});
var map = new OpenLayers.Map({
div: "map",
layers: [
new OpenLayers.Layer.WMS(
"OpenLayers WMS",
"http://maps.opengeo.org/geowebcache/service/wms",
{layers: "openstreetmap", format: "image/png"}
),
states
],
center: new OpenLayers.LonLat(-101, 39),
zoom: 3
});
// called when features are fetched
function loadFeatures(data) {
var features = new OpenLayers.Format.GeoJSON().read(data);
states.addFeatures(features);
}
// update filter and redraw when form is submitted
var cql = document.getElementById("cql");
var output = document.getElementById("output");
function updateFilter() {
var filter;
try {
filter = format.read(cql.value);
} catch (err) {
output.value = err.message;
}
if (filter) {
output.value = "";
rule.filter = filter;
states.redraw();
}
return false;
}
updateFilter();
var form = document.getElementById("cql_form");
form.onsubmit = updateFilter;
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