[mapserver-users] How to keep map from zooming/panning when I refresh?

Wed, 11 Sep 2002 10:45:48 -0500

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Thanks!  I ended up trying the same exact thing this morning, before I 
even read this email...I guess I finally saw the light...and it's 
working now!  My javascript function looks almost identical to yours, 
thanks for the help!

Matthew Hatcher wrote:

> Here is the Javascript function that I use. I think the problem is 
> that the values for your map click location are kept from the last pan 
> or zoom, so that when the map refreshes it thinks you have clicked 
> off-centre. (this is just my laymans interpretation of it, so don't 
> flame me if that's wrong!)
>
> Anyway, this little script works for me:
>
>         // update the map without panning or zooming
>         function updateMap() {
>                 document.mapserv.mode.value = "browse";
>                 document.mapserv.target = "_self";
>                 document.mapserv.zoomdir.value = "0";
>                 document.mapserv.imgext.value = "[minx] [miny] [maxx] 
> [maxy]";
>                 document.mapserv.imgxy.value = "299.5 215.5";
>                 document.mapserv.submit();
>         }
>
> I have attached this function to all the checkboxes I use to turn 
> layers on/off, so when the user clicks on one it automatically 
> updates, and seems to work nicely without panning or zooming.
>
> You'll need to change the values in imgxy to reflect your half-image 
> width/height, and also may need to change the document.mapserv if 
> you've called your settings form something different.
>
> Good luck!
> Matt.
>
> -----Original Message-----
> From: Mike Smith [ mailto:nospam@cnrit.tamu.edu ]
> Sent: 06 September 2002 14:53
> To: Martin, Daniel
> Cc: mapserver-users@lists.gis.umn.edu
> Subject: Re: [mapserver-users] How to keep map from zooming/panning when
> I refresh?
>
>
> Thanks for this.  This sorta worked...it kept my image from zooming in,
> but then it panned to the right for some reason?!  I'm not sure what's
> up with that, but the other problem is that I've got to keep the
> "zoomdir" variable set because I keep the state of my "Zoom In",  "Zoom
> Out", and "Pan" buttons based on the value of this variable, so setting
> it to null resets all my buttons.  Regardless of my implementation,
> though, I even had this problem with the Itasca Demo...  I'm just
> wondering if anybody else figured out a way to alter the image without
> the Mapserver CGI program reading and executing your zoomdir variable.
>
> Thanks for the help, though...anybody else have any ideas?
>
> MIke
>
> Martin, Daniel wrote:
>
> >Whoops, I messed up the JavaScript.  This is a correction, note 
> ".value" is
> >added:
> >
> >function UpdateMap() {
> >    document.forms.mapserv.zoomdir.value = "";
> >    document.mapserv.submit();  
> >}
> >
> >
> >-----Original Message-----
> >From: Martin, Daniel
> >Sent: Thursday, September 05, 2002 11:47 AM
> >To: 'Mike Smith'; mapserver-users@lists.gis.umn.edu
> >Subject: RE: [mapserver-users] How to keep map from zooming/panning when
> >I refresh?
> >
> >
> >I think this will work:
> >
> >function UpdateMap() {
> >    document.forms.mapserv.zoomdir = "";
> >    document.mapserv.submit();  
> >}
> >
> >Or perhaps I'm missing something.  I do exactly what you say in my 
> client,
> >but I use Rosa to control zooming and panning, so it is a bit different.
> >
> >-Dan
> >
> >-----Original Message-----
> >From: Mike Smith [ mailto:nospam@cnrit.tamu.edu ]
> >Sent: Thursday, September 05, 2002 10:01 AM
> >To: mapserver-users@lists.gis.umn.edu
> >Subject: [mapserver-users] How to keep map from zooming/panning when I
> >refresh?
> >
> >
> >Hello,
> >
> >    I've got my page working pretty well now thanks to lots of
> >Javascript code I borrowed from this mailing list, but I've still got
> >one problem that I can't seem to find a solution for in the archives.
> > I've got my page set up so that the various layers that are available
> >to view are in a list on the right-hand side of the page with checkboxes
> >next to them.  And since I wanted the behavior of the page to imitate
> >ArcView as much as possible (because most of my users are used to that
> >interface) I put in a little javascript function that automatically
> >reloads the page whenever they check or uncheck a layer (without having
> >to click a "refresh" button).  My problem is that the layer loads or
> >unloads fine, but my image also pans or zooms at the same time depending
> >on what function they have checked.  How can I make my page reload
> >without changing the current view at all?  Even if they have the "Zoom
> >In" button clicked and the zoomsize is set to "2" I don't want the page
> >to zoom in when they just add a new layer.  Is there a value that I can
> >set "zoomdir" to besides 1, 0, or -1 that basically disables panning and
> >zooming altogether?
> >
> >Thanks in advance,
> >
> >Mike Smith
> >
> >P.S. - Here's my javascript code that automatically loads/unloads layers:
> >
> >function UpdateMap() {
> >    document.mapserv.submit();   //Note that my form name is "mapserv"
> >}
> >
> >Then I add this to my checkbox tag:
> >
> >onClick="UpdateMap();"
> >
> >
>
>
>
> **********************************************************************
> The information contained in this email and any subsequent
> correspondence is private and is intended solely for the
> intended recipient(s). For those other than the intended
> recipient(s) any disclosure, copying, distribution, or any
> action taken or omitted to be taken in reliance on such
> information is prohibited and may be unlawful.
> **********************************************************************

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Thanks! &nbsp;I ended up trying the same exact thing this morning, before I even
read this email...I guess I finally saw the light...and it's working now!
&nbsp;My javascript function looks almost identical to yours, thanks for the help! 
 
Matthew Hatcher wrote: 
<blockquote type="cite" cite="mid:D9B1937D4099D411B0670090277C004F625571@ntexch02s.scs.dra.hmg.gb">
 <meta name="Generator" content="MS Exchange Server version 5.5.2653.12">
 <title>RE: [mapserver-users] How to keep map from zooming/panning when
I refresh?</title>
 Here is the Javascript function that I use. I think the
problem is that the values for your map click location are kept from the
last pan or zoom, so that when the map refreshes it thinks you have clicked
off-centre. (this is just my laymans interpretation of it, so don't flame
me if that's wrong!)
 Anyway, this little script works for me:
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // update the map without panning or zooming 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; function updateMap() { 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.mapserv.mode.value = "browse"; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.mapserv.target = "_self"; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.mapserv.zoomdir.value = "0"; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.mapserv.imgext.value = "[minx] [miny]
[maxx] [maxy]"; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.mapserv.imgxy.value = "299.5 215.5"; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.mapserv.submit(); 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }
 I have attached this function to all the checkboxes I
use to turn layers on/off, so when the user clicks on one it automatically
updates, and seems to work nicely without panning or zooming.
 You'll need to change the values in imgxy to reflect
your half-image width/height, and also may need to change the document.mapserv
if you've called your settings form something different.
 Good luck! 
 Matt.
 -----Original Message----- 
 From: Mike Smith [<a href="mailto:nospam@cnrit.tamu.edu">
mailto:nospam@cnrit.tamu.edu</a>
] 
 Sent: 06 September 2002 14:53 
 To: Martin, Daniel 
 Cc: <a class="moz-txt-link-abbreviated" href="mailto:mapserver-users@lists.gis.umn.edu">mapserver-users@lists.gis.umn.edu</a> 
 Subject: Re: [mapserver-users] How to keep map from zooming/panning
when 
 I refresh?
 
 Thanks for this.&nbsp; This sorta worked...it kept my image
from zooming in, 
 but then it panned to the right for some reason?!&nbsp; I'm not
sure what's 
 up with that, but the other problem is that I've got to
keep the 
 "zoomdir" variable set because I keep the state of my "Zoom
In",&nbsp; "Zoom 
 Out", and "Pan" buttons based on the value of this variable,
so setting 
 it to null resets all my buttons.&nbsp; Regardless of my implementation,
 
 though, I even had this problem with the Itasca Demo...&nbsp;
I'm just 
 wondering if anybody else figured out a way to alter the
image without 
 the Mapserver CGI program reading and executing your zoomdir
variable.
 Thanks for the help, though...anybody else have any ideas?
 MIke
 Martin, Daniel wrote:
 &gt;Whoops, I messed up the JavaScript.&nbsp; This is a correction,
note ".value" is 
 &gt;added: 
 &gt; 
 &gt;function UpdateMap() { 
 &gt;&nbsp;&nbsp;&nbsp; document.forms.mapserv.zoomdir.value = ""; 
 &gt;&nbsp;&nbsp;&nbsp; document.mapserv.submit();&nbsp;&nbsp; 
 &gt;} 
 &gt; 
 &gt; 
 &gt;-----Original Message----- 
 &gt;From: Martin, Daniel 
 &gt;Sent: Thursday, September 05, 2002 11:47 AM 
 &gt;To: 'Mike Smith'; <a class="moz-txt-link-abbreviated" href="mailto:mapserver-users@lists.gis.umn.edu">mapserver-users@lists.gis.umn.edu</a> 
 &gt;Subject: RE: [mapserver-users] How to keep map from
zooming/panning when 
 &gt;I refresh? 
 &gt; 
 &gt; 
 &gt;I think this will work: 
 &gt; 
 &gt;function UpdateMap() { 
 &gt;&nbsp;&nbsp;&nbsp; document.forms.mapserv.zoomdir = ""; 
 &gt;&nbsp;&nbsp;&nbsp; document.mapserv.submit();&nbsp;&nbsp; 
 &gt;} 
 &gt; 
 &gt;Or perhaps I'm missing something.&nbsp; I do exactly what
you say in my client, 
 &gt;but I use Rosa to control zooming and panning, so it
is a bit different. 
 &gt; 
 &gt;-Dan 
 &gt; 
 &gt;-----Original Message----- 
 &gt;From: Mike Smith [<a href="mailto:nospam@cnrit.tamu.edu">
mailto:nospam@cnrit.tamu.edu</a>
] 
 &gt;Sent: Thursday, September 05, 2002 10:01 AM 
 &gt;To: <a class="moz-txt-link-abbreviated" href="mailto:mapserver-users@lists.gis.umn.edu">mapserver-users@lists.gis.umn.edu</a> 
 &gt;Subject: [mapserver-users] How to keep map from zooming/panning
when I 
 &gt;refresh? 
 &gt; 
 &gt; 
 &gt;Hello, 
 &gt; 
 &gt;&nbsp;&nbsp;&nbsp; I've got my page working pretty well now thanks
to lots of 
 &gt;Javascript code I borrowed from this mailing list, but
I've still got 
 &gt;one problem that I can't seem to find a solution for
in the archives. 
 &gt; I've got my page set up so that the various layers
that are available 
 &gt;to view are in a list on the right-hand side of the
page with checkboxes 
 &gt;next to them.&nbsp; And since I wanted the behavior of the
page to imitate 
 &gt;ArcView as much as possible (because most of my users
are used to that 
 &gt;interface) I put in a little javascript function that
automatically 
 &gt;reloads the page whenever they check or uncheck a layer
(without having 
 &gt;to click a "refresh" button).&nbsp; My problem is that the
layer loads or 
 &gt;unloads fine, but my image also pans or zooms at the
same time depending 
 &gt;on what function they have checked.&nbsp; How can I make
my page reload 
 &gt;without changing the current view at all?&nbsp; Even if they
have the "Zoom 
 &gt;In" button clicked and the zoomsize is set to "2" I
don't want the page 
 &gt;to zoom in when they just add a new layer.&nbsp; Is there
a value that I can 
 &gt;set "zoomdir" to besides 1, 0, or -1 that basically
disables panning and 
 &gt;zooming altogether? 
 &gt; 
 &gt;Thanks in advance, 
 &gt; 
 &gt;Mike Smith 
 &gt; 
 &gt;P.S. - Here's my javascript code that automatically
loads/unloads layers: 
 &gt; 
 &gt;function UpdateMap() { 
 &gt;&nbsp;&nbsp;&nbsp; document.mapserv.submit();&nbsp;&nbsp; //Note that my form
name is "mapserv" 
 &gt;} 
 &gt; 
 &gt;Then I add this to my checkbox tag: 
 &gt; 
 &gt;onClick="UpdateMap();" 
 &gt; 
 &gt;
 <code> 
 
 ********************************************************************** 
 The information contained in this email and any subsequent 
 correspondence is private and is intended solely for the 
 intended recipient(s). For those other than the intended 
 recipient(s) any disclosure, copying, distribution, or any 
 action taken or omitted to be taken in reliance on such 
 information is prohibited and may be unlawful. 
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