protocol-gears.html
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css" />
<link rel="stylesheet" href="style.css" type="text/css" />
<style type="text/css">
.float-left {
float: left;
}
.clear-left {
clear: left;
}
</style>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
var map, vector, protocol, modify;
function init() {
// create Gears protocol
protocol = new OpenLayers.Protocol.SQL.Gears({
databaseName: "db_name",
tableName: "table_name",
saveFeatureState: false
});
if (!GearsIsSupported()) {
return;
}
map = new OpenLayers.Map("map");
// create base layer
var layer = new OpenLayers.Layer.WMS("OpenLayers WMS",
"http://labs.metacarta.com/wms/vmap0",
{"layers": "basic"}
);
map.addLayer(layer);
// create vector layer
vector = new OpenLayers.Layer.Vector("Vector", {
protocol: protocol,
strategies : [new OpenLayers.Strategy.Fixed()],
eventListeners: {
featuremodified: function(obj) {
if (obj.feature.state != OpenLayers.State.INSERT &&
obj.feature.state != OpenLayers.State.DELETE) {
obj.feature.state = OpenLayers.State.UPDATE;
}
displayStatus();
}
}
});
map.addLayer(vector);
// create modify feature control
modify = new OpenLayers.Control.ModifyFeature(vector);
// create editing panel
var panel = new OpenLayers.Control.Panel({
displayClass: "olControlEditingToolbar"
});
var navigation = new OpenLayers.Control.Navigation({
eventListeners: {
activate: function(obj) {
modify.activate();
},
deactivate: function(obj) {
modify.deactivate();
}
}
});
var editing = new OpenLayers.Control.DrawFeature(
vector, OpenLayers.Handler.Polygon, {
displayClass: "olControlDrawFeaturePolygon",
eventListeners: {
featureadded: function(obj) {
obj.feature.state = OpenLayers.State.INSERT;
displayStatus();
}
}
});
panel.addControls([navigation, editing]);
panel.defaultControl = navigation;
// add controls to the map
map.addControl(modify);
map.addControl(panel);
// center the map
map.setCenter(new OpenLayers.LonLat(5, 40), 5);
}
function displayResult(txt) {
if (window.resultDomElement === undefined) {
window.resultDomElement = OpenLayers.Util.getElement("last-result");
}
resultDomElement.innerHTML = txt;
displayStatus();
}
function displayStatus() {
if (window.statusDomElement === undefined) {
window.statusDomElement = OpenLayers.Util.getElement("status");
}
var createCnt = 0;
var updateCnt = 0;
var deleteCnt = 0;
var i, len, state;
for (i = 0, len = vector.features.length; i < len; i++) {
state = vector.features[i].state;
if (state == OpenLayers.State.INSERT) {
createCnt++;
} else if (state == OpenLayers.State.UPDATE) {
updateCnt++;
} else if (state == OpenLayers.State.DELETE) {
deleteCnt++;
}
}
statusDomElement.innerHTML = createCnt + " features to create, " +
updateCnt + " features to update, " +
deleteCnt + " features to delete";
}
function GearsIsSupported() {
if (!protocol.supported()) {
OpenLayers.Console.userError("You must install Gears prior to using this example");
return false;
}
return true;
}
function featuresWithState(state) {
var list = [];
var i, len, feature;
for (i = 0, len = vector.features.length; i < len; i++) {
feature = vector.features[i];
if (feature.state == state) {
list.push(feature);
}
}
return list;
}
function _sync() {
if (!GearsIsSupported()) {
return;
}
var resp = protocol.read();
if (!resp.success()) {
OpenLayers.Console.error("reading from Gears DB failed");
return;
}
vector.destroyFeatures();
if (!resp.features || resp.features.length <= 0) {
displayResult("No features to read");
return;
}
vector.addFeatures(resp.features);
displayResult("features successfully read");
}
function _commit() {
if (!GearsIsSupported()) {
return;
}
var error = false;
function callback(resp) {
if (error) {
return;
}
if (!resp.success()) {
OpenLayers.Console.error("Commiting to Gears DB failed");
error = true;
return;
}
modify.selectControl.unselectAll()
if (resp.reqFeatures) {
vector.destroyFeatures(resp.reqFeatures);
}
if (resp.features) {
vector.addFeatures(resp.features);
}
}
if (vector.features.length > 0) {
protocol.commit(vector.features, {
"create": {
callback: callback
},
"update": {
callback: callback
},
"delete": {
callback: callback
}
});
if (!error) {
displayResult("features successfully committed");
}
} else {
displayResult("no features to commit");
}
}
function _delete() {
if (!GearsIsSupported()) {
return;
}
var feature = vector.selectedFeatures[0];
if (feature) {
modify.selectControl.unselectAll()
feature.state = OpenLayers.State.DELETE;
displayStatus();
}
}
</script>
</head>
<body onload="init()">
<h1 id="title">Gears Protocol Example</h1>
<div id="tags">
</div>
<p id="shortdesc">
Shows the usage of the Gears protocol.
</p>
<div class="float-left">
<div id="map" class="smallmap"></div>
</div>
<div>
<a href="javascript:_sync()">Sync</a>
<p>The Sync link destroys the features currently in the layer, reads
features from the Gears database, and adds them to the layer.
Uncommitted features will be lost.</p>
<a href="javascript:_commit()">Commit</a>
<p>The Commit link commits to the Gears database the features that are
marked as INSERT, UPDATE or DELETE.</p>
<a href="javascript:_delete()">Delete</a>
<p>The Delete link marks the selected feature as DELETE. To select a feature
click choose the navigation control in the editing toolbar.</p>
</div>
<div style="margin-top: 30px">
<p>Status: <span id="status"></span></p>
<p>Result: <span id="last-result"></span></p>
</div>
<div class="clear-left" id="docs">
<p>This example demonstrates the usage of OpenLayers Gears protocol to
read/create/update/delete features from/to the Gears database.
<a href="http://gears.google.com/">Gears</a> must obviously be installed
in your browser for this example to work.</p>
</div>
</body>
</html>