I'm working on a webapplication which requires snapping on some layers. I've enabled snapping using these lines of code:
var map = this.app.map;
this.snappingManager = map.enableSnapping({
alwaysSnap: true,
snapPointSymbol: esri.symbol.SimpleMarkerSymbol(),
tolerance: t,//t is a parameter in the complete function
snapKey: dojo.keys.copyKey
});
But when I try to snap to my layers, it does not work. I tried to debug my code and saw some behaviour which seems strange in the SnappingManager.js code from the javascript api
When the Snappingmanager is in the _getSnappingPoint function, the following code is executed:
n = this.map._getFrameWidth(); variable n is used in this function in various places
In my case n has the value undefined and I think therefore the other parts of the function fail.
I had a closer look at the _getFrameWidth function which gives an undefined
_getFrameWidth: function() {
var a = -1, b = this.spatialReference._getInfo();
this.__LOD ? (b = this.__LOD._frameInfo) && (a = b[3]) : b && (a = Math.round(2 * b.valid[1] / (this.extent.getWidth() / this.width)));
return a
In the first line of code I get a null for this.spatialReference._getInfo(); because my map is in WKID 28992
However the map has a .__LOD, so the function will try to use this in the tenary operaion and assign the _frameInfo from the LOD to b and then tries to get a value from this array. However my array is empty, because my __LOD looks like this: "{"scale":1216.7116413886708,"_frameInfo":[]}"
I compared my map to one of the examples from Esri and in this map the __LOD looks like this:
{"level":17,"resolution":1.1943285668550503,"scale":4513.988705,"startTileRow":214,"startTileCol":0,"endTileRow":130857,"endTileCol":131071,"_frameInfo":[131072,0,131071,33554432]}
And snapping works fine when I added a snapping manager from the Chrome Console into the example
