[mapserver-users] Intercepting Map Click Coordinates withJavaScript ? Zooming with scale values.

[Vladimir Guzmán]

Hello.
I've been working on this for a while, and actually I can make it work in
IE 5+ and in Netscape 4.  Actually I'm working on make it work with
Mozilla/Gecko browsers.  I can do it with a tool I've found in
http://dynapi.sourceforge.net/dynapi/
called DynApi.
You can try my site in
http//200.24.94.114/ifx/
login test
password test
It is an application to manage ISP's coverages, so we can view, edit, 
delete and update
clients, nodes and antennas on line.  It includes a geo-coding algorithm.
It was designed for Bogota - Colombia - S.A.
If you have questions on how I've done, I'll be glad to answer.



-- 
Vladimir Guzmán R.
-----------------
www.main-task.com


Stephen Woodbridge wrote:

>Well yes it IS darn near impossible! I got it to work for NS4 and IE4
>but I never played with it to get it to work on IE5 or NS6. Check out:
>
>http://web-maps.org/RQ/nav_map.php3?event=get_map&clat=42.634735&clon=-71.390831&zoom=8&title=North+Chelmsford%2C+MA+01863
>
>and run the cursor over the map and read the lat/lon in the boxes below
>the map.
>
>Let me know if anyone is interested in trying to get it to work with IE5
>and NS6 or adding it to a navigation Skin.
>
>-Steve W.
>
>Steve Lime wrote:
>
>>Does this actually work? I was under the impression it would IF the
>>image in question was in an absolutely positioned layer or it's own
>>frame. It's typically easy to get page coordinates but figuring out
>>where an image lies on the page (so you know where you are in the image)
>>is darn near impossible without layers or frames.
>>
>>Steve
>>
>>Stephen Lime
>>Data & Applications Manager
>>
>>Minnesota DNR
>>500 Lafayette Road
>>St. Paul, MN 55155
>>651-297-2937
>>
>>>>>Walt Lin <joemayfair at usa.net> 01/21/02 12:18 PM >>>
>>>>>
>>With CGI, it's dirt easy-- the input type=image automatically sends
>>along name.x and name.y as cgi parameters.  So if you could do what you
>>want to server side, that's the most reliable and the easiest.
>>
>>If you must do it client side, you could do something like this:
>>var mouseX=0,mouseY=0,setX=0,setY=0;
>>function getMousemove(e){
>>    mouseX= (bw.ns4||bw.ns6)? e.pageX:
>>                        bw.ie&&bw.win&&!bw.ie4? (event.clientX
>>                -2)+document.body.scrollLeft : !bw.opera5?
>>                        event.clientX+document.body.scrollLeft :
>>                        (event.clientX-2);
>>    mouseY= (bw.ns4||bw.ns6)? e.pageY:
>>                        bw.ie&&bw.win&&!bw.ie4? (event.clientY
>>                        -2)+document.body.scrollTop : !bw.opera5?
>>                        event.clientY+document.body.scrollTop
>>                         : (event.clientY-2);
>>};
>>
>>where the bw is browser detection stuff.
>>
>>On Mon, Jan 21, 2002 at 11:38:36AM -0500, Doyon, Jean-Francois wrote:
>>
>>>Hello,
>>>
>>>This is not necessarily a mpaserver specific question but ...
>>>
>>>Is there anyway/does anybody know how to intercept the x/y pixel
>>>
>>coordinates
>>
>>>that the user generated by clicking on the map when using the map as
>>>
>>an
>>
>>><input type=image> ?
>>>
>>>I'm trying to create an interface that uses scale values to determine
>>>
>>the
>>
>>>next up/down zoom levels, and apparently in order to do this I have to
>>>
>>use
>>
>>>the CGI variable MAPXY, which unfortunately has to be inn the map's
>>>projection coordinates.
>>>
>>>So, I need to intercept the pixel coordinates (img.x and img.y) in
>>>
>>order to
>>
>>>do the necessary calculations and set MAPXY, all this triggered by the
>>>form's onSubmit ...
>>>
>>>Anybody have any idea on how to do this? I haven't had any luck so far
>>>
>>using
>>
>>>things like document.form.img.x ...
>>>
>>>If worse comes to worse I guess I could use client-side maps, but I'd
>>>
>>rather
>>
>>>not unless I absolutely have to!
>>>
>>>Thanks in advance for the help!
>>>
>>>Jean-Fran?ois Doyon
>>>Internet Service Development and Systems Support
>>>GeoAccess Division
>>>Canadian Center for Remote Sensing
>>>Natural Resources Canada
>>>http://atlas.gc.ca
>>>Phone: (613) 992-4902
>>>Fax: (613) 947-2410
>>>
>>>
>>>
>
>