[Mapserver-users] Zoom In to a defined area

[Jeff L.]

Thank you Armin for your reply.
I tried your suggestion and it works. However, setting the name to "mapext" 
makes the standard "zoom in" and "zoom out" functions unusable as "mapext" 
is now overriding the MapServer "mapext" variable. When I try zoom in, i 
have this error "loadForm(): Web application error. Not enough arguments for 
mapext".

I tried to change the name of tha variable to "ViewArea" then setting mapext 
to "ViewArea" value, but no success. Here is my code snippet:

function AreaSelected()
{
     if (document.forms[0].ViewArea.selectedIndex != 0 &&
         document.forms[0].ViewArea.selectedIndex !=1)
        {
           mapext = document.forms[0].ViewArea; // not sure about this
           document.forms[0].submit();
       }
}

...

<SELECT NAME="ViewArea"  onChange="AreaSelected()">
  <OPTION VALUE="">Go to</OPTION>
  <OPTION VALUE="">- - - - - - - - - - - - - </OPTION>
  <OPTION VALUE="-180 45 180 90">Area 1</OPTION>
  <OPTION VALUE="-180 0 180 45">Area 2</OPTION>
</SELECT >


Jeff Lacoste




>From: Armin Burger <armin.burger at libero.it>
>Reply-To: Armin Burger <armin.burger at libero.it>
>To: nf10 at hotmail.com, mapserver-users at lists.gis.umn.edu
>Subject: Re: [Mapserver-users] Zoom In to a defined area
>Date: Mon, 1 Sep 2003 23:22:56 +0100
>
>Jeff,
>
>try something like
>
><SELECT NAME="mapext"  onChange="AreaSelected()">
>  <OPTION VALUE="">Go to</OPTION>
>  <OPTION VALUE="">- - - - - - - - - - - - - </OPTION>
>  <OPTION VALUE="-180 45 180 90">Area 1</OPTION>
>  <OPTION VALUE="-180 0 180 45">Area 2</OPTION>
></SELECT >
>
>Armin
>
>
> > Hi,
>
> > By knowing the map coordinates of a specific area (xMin, yMin, xMax and
> > yMax), i would like to zoom in to such area. I have a combo box with
>defined
> > areas to zoom in, i’m using CGI and JavaScript to change map extents,
>but no
> > success so far. My question would be how to pass the map extents and
>may be
> > the center of the image is also required to change? Here is my code
>snippet:
> > ....
>
> > <SCRIPT LANGUAGE="JavaScript"><!--
>
> > function AreaSelected()
> > {
> >     if (document.forms[0].ViewArea.selectedIndex != 0 &&
> > 	 document.forms[0].ViewArea.selectedIndex !=1)
> >     	document.forms[0].submit();
> > }
>
> > //--></SCRIPT>
>
> > <form method=GET action="[program]" name=myform>
>
> > ....
>
> > <SELECT NAME="ViewArea"  onChange="AreaSelected()">
> > <OPTION>Go to</OPTION>
> > <OPTION>- - - - - - - - - - - - - </OPTION>
> > <OPTION VALUE="-180,45,180,90">Area 1</OPTION>
> > <OPTION VALUE="-180,0,180,45">Area 2</OPTION>
> > </SELECT >
>
> > ....
>
> > <input type="hidden" name="imgxy" value="299.5 299.5">
> > <input type="hidden" name="imgext" value="[mapext]">
> > ....
> > </form>
>
>
> > Any help is appreciated
>
> > Jeff Lacoste
>
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> > Mapserver-users at lists.gis.umn.edu
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>

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