We have a simple prototype application that shows a map and allows the user to draw polygons on the map. The polygon that is drawn is saved to an arcGis server. I'll show what I think are the relevant snippets of code below with a brief description of what I believe is going on:The section that allows for the drawing of the polygon looks like this: function digitizeShape(evt) {
//initialiaze the toolbar, if not found
if (!drawToolbar) { InitToolbar() }
//set the map to the digitize state
map.disableMapNavigation;
drawToolbar.activate(esri.toolbars.Draw.POLYGON);
}
Once the user is finished digitizing the polygon, this code is called to save it to the server: function addToMap(evt) {
//get the name
var buildingName = document.getElementById('BuildingNameBox').value;
//get the polygon coordinates
var polyString = dojo.toJson(evt.geographicGeometry.toJson());
// polyString = '';
//also commit to the server
var requestText = "facno=" + buildingName + "&shape=" + polyString;
httpAddRequest = new XMLHttpRequest();
httpAddRequest.open("POST", "../ajax/postfacility.aspx?type=IHB", true);
httpAddRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
httpAddRequest.onreadystatechange = evalAddResult;
httpAddRequest.send(requestText);
//restore the map navigation state
map.enableMapNavigation;
drawToolbar.deactivate();
}
Finally, once the postback is complete, we refresh the map: function evalAddResult(args) {
if (httpAddRequest.readyState == 4 /* complete */) {
if (httpAddRequest.status == 200) {
//see if the add was successful
if (httpAddRequest.getResponseHeader("ERROR") == null) {
//success: refresh the map
var ihbLayer = map._layers['buildings'];
ihbLayer.refresh();
}
else {
//TODO: show the error when we get jquery messaging sorted out
//ShowMessage(httpAddRequest.getResponseHeader("ERROR"), "Add Failed");
window.alert(httpAddRequest.getResponseHeader("ERROR"));
}
}
}
}
All this works good except for one exception: The refreshing of the map takes about 5 seconds. So I'm wondering... Are we doing this correctly? Is Layer.Refresh the most efficient way to refresh the map, or is there another way that would work better?Or... Is the problem really just a performance issue with our server? Right now we're just trying out azurewebsites.net. Maybe there's too much running on our server?Any insight would be helpful.
