Hello,
I posted this question back in 2014 and didn't get any responses. I must have found an alternative approach back then, but now I need to do it again and I'm still stuck. I have a graphics refresh issue. I'm adding a PictureMarkerSymbol into a graphics layer which has a png image as its source url.
var theSymbol = new esri.symbol.PictureMarkerSymbol({
"url": "IMAGES/TestImage.png",
"height": 30,
"width": 30
});
var mapPoint = new esri.geometry.Point(350000, 900000, new esri.SpatialReference({ wkid: 27700 }));
var graphic = new esri.Graphic(mapPoint, theSymbol);
customGraphicsLayer.add(graphic);
This works fine, but the problem is the source png image changes periodically (but the name TestImage.png remains the same), it's updated externally and I need the graphic icon on the map to update when the user clicks an update button (actually I've only added a button for testing, ultimately I'll automate it). However I can't get the API/browser to forget about the previous image. I've tried clearing the graphics, removing the graphics layer and adding it again, and adding a new PictureMarkerSymbol after I know the source png image has changed, but it seems that once the API/browser knows about the original image it assumes it hasn't changed and re-uses the original image from somewhere in its memory. Doing a full page refresh isn't really an option.
Can anyone suggest how I can make sure my PictureMarkerSymbol grabs the latest image, not what it thinks the image is from the API/browser cache?
Thank you.
Mark
