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Re: [mapserver-users] Fwd: full extent

I actually had to play with it a while to get it working also.  As you can see the comment line right above that line where I'm setting the zoomdir says that we must  "select the Pan option", but a zoomdir value of "1" is really zoom in.  Selecting Pan didn't work in my web page, so I started manually setting the zoomdir value to 1 (zoom in) and it worked.

Couple of notes here.  You will probably be able to nail down exactly what your problem is by watching the "Javascript Console" that comes with your web browser.  Under Netscape I find this console by pulling down the "Tasks" menu in my browser and going to the "Tools" option and then selecting "Javascript Console".  I see exactly which line of my code is crapping out by watching the errors that appear on that console when I load my page.

Also, I went ahead and put a couple of lines into my init HTML page to manually set the initial values of a couple of variables...like this:

<input type="hidden" name="zoomsize" value=2>
<input type="hidden" name="zoomdir" value=1>

Then in my main HTML page I put these two lines:

<input type="hidden" name="zoomsize" value="[zoomsize]">
<input type="hidden" name="zoomdir" value="[zoomdir]">

I did this just to avoid getting any "document.mapserv.zoomdir.value has no properties" errors.  Please also note that you must have named your HTML form "mapserv" in order to use my code word-for-word, for example, my HTML FORM tag looks like this:

<form method=GET name="mapserv" action="[program]">

If the word after the "name=" in your form tag looks any different, then you need to substitute all the "mapserv" words in my javascript code with whatever you have named your form.

Hope this helps,

Mike



Rob Holloway wrote:


20020905130317.15649.qmail@web12505.mail.yahoo.com">
  
Hi 

I tried the code you supplied but I'm still having
some problems.  The button only works after I have
manually selected my pan radio button - for some
reason the document.mapserv.zoomdir.value = 1;  
doesn't seem to work.  Have any ideas?

Cheers

Rob

--- Mike Smith <nospam@cnrit.tamu.edu> wrote:

  

    
I borrowed this javascript function from the
mapserver mail archive and 
it works for me.  Just put this code in the head
block of your HTML page:

<SCRIPT language=JavaScript>
function goGlobal() {
  //select the Pan option so we won't zoom in when
clicking "full extent"
  document.mapserv.zoomdir.value = 1;   // NOTE that
my HTML form is 
named "mapserv"
  document.mapserv.zoomsize.value = 2;  // Use your
form's name here 
after "document."
  //set image extent to the extent value in your map
file
  // map extent is 33.709580 -4.999999 41.891010
5.682579
  document.mapserv.imgext.value = "30.109580
-4.999999 48.891010 6.082579";
  document.mapserv.imgbox.value = "-1 -1 -1 -1";
//used with the mapplet
  //set center pixel coordinates - my image size is
565 by 670
  document.mapserv.imgxy.value = "232.5 335.0";
  document.mapserv.submit();
}
</SCRIPT>

then c
all the function from any image (for example)
using the "onClick" 
action like this:

<img src="javascript:void(0);" >

Hope this helps,

Mike Smith

Steve Lime wrote:


    

      


      

      

      
------------------------------------------------------------------------

      

        

          
Subject:

full extent
From:

Rob Holloway <rholloway_1999@yahoo.com>
Date:

Wed, 4 Sep 2002 11:14:46 -0700 (PDT)
To:

mapserver-info@lists.gis.umn.edu


Hi

I'm trying to create a zoom to full extent button
without much success.  Does anyone have any
suggestions/code to offer.  Thanks!

Rob

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