topic Re: How do I zoom to a specific scale programmatically? in ArcGIS Viewer for Flex Questions

How do I zoom to a specific scale programmatically?

YohanBienvenue — Tue, 17 Dec 2013 19:21:05 GMT

Hi,

I modified the CoordinateWidget so that the current scale value of the map is displayed in the lower left corner of the map.

[ATTACH=CONFIG]29949[/ATTACH]

However I don't just need to see it, I want the user to be able to specify the scale too.
Which is why I made the scale displayed in a TextInput.

I thought there would be a simple function in the API to let me zoom the map by passing a specific scale, but I didn't find one.
It has to be possible since the API Navigator component (com.esri.ags.components.Navigation) does it with the LODs specified in the config.xml.

Anyone already did something like this?

Thanks

Re: How do I zoom to a specific scale programmatically?

AnthonyGiles — Wed, 18 Dec 2013 04:51:32 GMT

Yohan,

Just use map.scale

Regards

Anthony

Re: How do I zoom to a specific scale programmatically?

YohanBienvenue — Wed, 18 Dec 2013 11:44:31 GMT

Ok this works.
I already use map.scale to get the value, didn't realize I could use this property to set the scale instead of going through a setter.

If I use this solution though, I'll have to get it rid of the LODs in the config.xml, otherwise it just scales to the closest LOD instead of the entered value.

We don't use tiles cache so we don't really need the LODs, but without them the Navigator widget will not have a zoom slider, which the users kind of like (instead of just the - and + zoom buttons).

Wish I could have both, but will settle for no LOD if it's not possible.

Thanks Anthony.

Re: How do I zoom to a specific scale programmatically?

AnthonyGiles — Wed, 18 Dec 2013 14:04:05 GMT

Yohan,

You could use a combobox instead of a text box and have your scales hard coded, or read in from from the widget xml file.

Fire the map.scale on change of the combobox value

Regards

Anthony