Introduction to online web GIS data collection based on Arcgis for Js, arcgisgis

Introduction to online web GIS data collection based on Arcgis for Js, arcgisgis

In the previous blog, "Conversion between WKT and geometry in Arcgis for js", the conversion between wkt and geometry is realized. The original blog address is http://blog.csdn.net/gisshixisheng/article/details/42657.pdf. In this section, we will briefly introduce online collection of web GIS data based on Arcgis for Js.

To achieve online data collection, the most important thing is data storage. The geometry object of the collected data is saved and can be converted to shp data later. In this article, my solution is to convert the previously drawn ry object to the wkt format and store it in the database. In the oracle database, use clob to store wkt.

Second, online data collection also needs to meet the following requirements:

1. Draw objects;

2. Edit an object;

3. Delete objects;

4. Display objects.

Next, let's take a look at the effect:

Main Window

Select Edit

Prompt after drawing is complete

Edit Point Set object

Click the map prompt to edit the information.

Deletion prompt

Deleted result

So far, online data collection is basically complete. Let's talk about the implementation steps.

1. drawing objects

The object is drawn through Edit, as shown below:

Var edit = new Edit (map); var select; edit. on ("deactivate", function (evt) {var geom = evt. graphic. geometry; var wkt = null; switch (geom. type) {case "polyline": {wkt = LineToWKT (geom); break;} case "polygon": {wkt = PolygonToWKT (geom); break;} default: {wkt = PointToWKT (geom); break ;}} if (confirm ('edit? ') {Console. log ("Edit:" + wkt) ;}}); map. on ("click", function (evt) {edit. deactivate ();});

EditItem = function (td) {var tr = td. parentElement; var objType = tr. id; var id = tr. cells [0]. innerHTML; var title = tr. cells [1]. innerHTML; $ ("# itemTitle" detail .html ("" detail .html (title); $ ("# itemType "). val ("point"); $ ("# itemObjtype "). val (objType) $ ("# editWindow "). show (); var draw = new Draw (map); draw. on ("draw-end", function (evt) {map. setMapCursor ("default"); var symbol = null, wkt; switch (evt. geometry. type) {Case "polyline": {symbol = new SimpleLineSymbol (SimpleLineSymbol. STYLE_SOLID, new Color ([255, 0, 0]), 3); wkt = LineToWKT (evt. geometry); break;} case "polygon": {symbol = new SimpleFillSymbol (SimpleFillSymbol. STYLE_SOLID, new SimpleLineSymbol (SimpleLineSymbol. STYLE_SOLID, new Color ([200,200,200, 0]), 2), new Color ([0.5,]); wkt = PolygonToWKT (evt. geometry); break;} default: {symbol = new Si MpleMarkerSymbol (SimpleMarkerSymbol. STYLE_SQUARE, 10, new SimpleLineSymbol (SimpleLineSymbol. STYLE_SOLID, new Color ([0,255, 0, 0]), 1), new Color ([0.25, 0,]); wkt = PointToWKT (evt. geometry); break;} var graphic = new Graphic (evt. geometry, symbol, {id: $ ("# itemObjtype "). val (), name: $ ("# itemTitle" ).html ()}); editLayer. add (graphic); draw. deactivate (); if (confirm ('Do you want to draw? ') {Console. log ("New:" + wkt) ;}}); on (dom. byId ("editBtn"), "click", function () {var objType = $ ("# itemType "). val (); switch (objType) {case "polyline": {draw. activate (esri. toolbars. draw. POLYLINE); break;} case "polygon": {draw. activate (esri. toolbars. draw. POLYGON); break;} default: {draw. activate (esri. toolbars. draw. POINT); break;} map. setMapCursor ("corsshair"); $ ("# editWindow "). hide ();});}

2. Edit an object

Object editing is implemented through Edit, as follows:

Var edit = new Edit (map); var select; edit. on ("deactivate", function (evt) {var geom = evt. graphic. geometry; var wkt = null; switch (geom. type) {case "polyline": {wkt = LineToWKT (geom); break;} case "polygon": {wkt = PolygonToWKT (geom); break;} default: {wkt = PointToWKT (geom); break ;}} if (confirm ('edit? ') {Console. log ("Edit:" + wkt) ;}}); map. on ("click", function (evt) {edit. deactivate () ;}); editLayer. on ("click", function (evt) {event. stop (evt); activateToolbar (evt. graphic) ;}); function activateToolbar (graphic) {var tool = 15; var options ={ allowAddVertices: "true", allowDeleteVertices: "true", uniformScaling: "true "}; edit. activate (tool, graphic, options); select = graphic ;}

3. Delete objects

DelItem = function (td) {if (confirm ('Delete? ') {Var id = tr. cells [0]. innerHTML; var graphics = editLayer. graphics; for (var I = 0, dl = graphics. length; I <dl; I ++) {var graphic = graphics [I]; if (graphic. attributes. id = id) {editLayer. remove (graphic); break ;}}}}

The last step is to pass the drawn geometry to the background. There are two main points. One is that after the drawing is complete, the code shows the draw-end event of the draw, and the other is after the editing is complete, the code shows the deactivate event of edit.