topic Re: Set Extent of Map from Value in Database Table in ArcGIS JavaScript Maps SDK Questions

Set Extent of Map from Value in Database Table

KeithAnderson — Wed, 23 Jul 2014 15:54:39 GMT

Folks

Please look at the example below. I am adding a map but would like to pass in the extent from an outside source...either a URL parameter or a QueryTask from a table. It seems that the order of operation for JavaScript is stumping me. The map requires the extent info prior to querying the extent. Please show me how to proceed. Thank you.

Keith

Re: Set Extent of Map from Value in Database Table

KenBuja — Wed, 23 Jul 2014 16:40:02 GMT

What I've done is to create the map with information from an external file (read into the parameters variable), then set its extent from the file after the map is loaded





map = new Map("divMap", {






    basemap: parameters.basemap,
    //extent: new Extent(parameters.extent),
    lods: parameters.lods,
    logo: false,
    showAttribution: false




});





map.on("load", function () {






    initialExtent = new Extent(parameters.extent);
    map.setExtent(initialExtent, true);

Re: Set Extent of Map from Value in Database Table

ReneWoy — Wed, 23 Jul 2014 18:57:36 GMT

I think the problem is, the result is a string, not a array

that should work:

map = new Map("map", {
                basemap: "topo",
                center: JSON.parse(cityextent), // longitude, latitude
                zoom: 13
            });

if you want to be sure use a callback:

require(["esri/map", "dojo/Deferred", "dojo/domReady!"], function (Map, Deferred) {
            GetUrlValue('extent').then(function (centerPoint) {
                console.info(centerPoint);
                map = new Map("map", {
                    basemap: "topo",
                    center: JSON.parse(centerPoint),
                    zoom: 13
                });
            });

            function GetUrlValue(VarSearch) {
                var deferred = new Deferred();
                var SearchString = window.location.search.substring(1);
                var VariableArray = SearchString.split('&');
                for (var i = 0; i < VariableArray.length; i++) {
                    var KeyValuePair = VariableArray.split('=');
                    if (KeyValuePair[0] == VarSearch) {
                        deferred.resolve(KeyValuePair[1]);
                    }
                    return deferred.promise;
                }
            }
        });

Re: Set Extent of Map from Value in Database Table

KeithAnderson — Wed, 23 Jul 2014 19:25:39 GMT

Thank you for the reply's!

Very grateful to both of you.

Keith

Re: Set Extent of Map from Value in Database Table

KeithAnderson — Tue, 05 Aug 2014 21:27:44 GMT

Rene

If you get a chance....

Trying to pull out database values on startup of the application.

Added another dojo/Deffered as you did for GetURLValue().

Stuck.

Thanks

Keith

Re: Set Extent of Map from Value in Database Table

ReneWoy — Sat, 23 Aug 2014 16:44:29 GMT

Sorry for the delay.

Have you found a solution? If not, can you post the result of

qTask.execute(QT, function (results) {
                    console.log(results); // post the result
...
...}

Re: Set Extent of Map from Value in Database Table

KeithAnderson — Thu, 28 Aug 2014 19:00:13 GMT

Rene

I did get an answer to this.

Thank you for you reply.

Keith Anderson

LOGIS GIS

5750 Duluth St

Golden Valley MN 55422

763-543-2641(w)

763-226-7061(c)

kanderson@logis.org<mailto:kanderson@logis.org>