[mapserver-users] nquery template question

Mon Mar 2 14:02:27 EST 2009

There are two templating options in MapServer 5.2+. The first is the "classic" method that uses a series
of small template files to construct a result set. I believe it's like so:

1. web header

... for each layer
2. layer header

... for each feature in the layer
3. layer or class template

4. layer footer

5. web footer

In 5.2 there's a new option to use new template tags in combination with a new output format. (see
http://mapserver.org/development/rfc/ms-rfc-36.html). Here's an example:

The output format block:

 OUTPUTFORMAT
    NAME 'county_select_list'
    DRIVER 'TEMPLATE'
    MIMETYPE 'text/javascript'
    FORMATOPTION 'ATTACHMENT=county_select_list.js'
    FORMATOPTION 'FILE=/templates/county_select_list.js'
  END

The template (county_select_list.js):

function updateCountyList(element) {
  var option;

[resultset layer="counties"][feature]
  option = new Option("[CTY_NAME]", "[shpext format="$minx,$miny,$maxx,$maxy"  precision=0 expand="10%"]");
try {
  element.add(option, null);
} catch(e) {
  element.add(option);
}
[/feature][/resultset]
}

The tags to pay attention to are  [resultset] and [feature]. The [resultset] tag is used to present a layer, the 
[feature] tag is used to present 1 feature. So, in the above example if the layer "counties" has results then we'll
process the code between the [resultset][/resultset] block. And the for each feature in the layer we process the
code between the [feature][/feature] block. Works nice. You can choose which output format to use with the
qformat CGI variable. Here's the output generated through this template:

function updateCountyList(element) {
  var option;

  option = new Option("Clearwater", "304963,5219538,337550,5326697");
  try {
    element.add(option, null);
  } catch(e) {
    element.add(option);
  }
  option = new Option("Aitkin", "434591,5106383,498803,5213702");
  try {
    element.add(option, null);
  } catch(e) {
    element.add(option);
  }
  option = new Option("Chisago", "486969,5013450,529584,5066587");
  try {
    element.add(option, null);
  } catch(e) {
    element.add(option);
  }
  option = new Option("Blue Earth", "387528,4852924,441106,4904495");
  try {
    element.add(option, null);
  } catch(e) {
    element.add(option);
  }
}

You certainly can have multiple layers in one template of this form. Hope this helps.

Steve

>>> On 2/24/2009 at 7:30 PM, in message
<200902250032.n1P0WocP031639 at atom.scu.edu.au>, Greg Luker <gluker at scu.edu.au>
wrote:
> Hi mapserver-users,
> 
> How does nquery templating work?
> I'm trying to modify nquery result contents using javascript (I don't 
> know much about javascript!). The best I have done so far is (nquery 
> template):
> 
> <html xmlns="http://www.w3.org/1999/xhtml">
>          <head>
>          </head>
>          <body>
>                  <script language="Javascript" type="text/javascript">
>                          var Cell = window.document.all.A1;
>                          Cell.innerText = " ";
>                  </script>
>                  <form name="table1" method="post">
>                          <tr bgcolor=#FFFFD0>
>                                  <td ID="A1">[site_code]</td>
>                                  <td>[site_name]</td>
>                                  <td>[featdesc_description]</td>
>                                  <td>[feature_comment]</td>
>                                  <td>[genderaccess_description]</td>
>                          </tr>
>                  </form>
>          </body>
> </html>
> 
> Which blanks the first [site_code] returned, but I want to blank 
> repeating [site_code] in the nquery result table. Any ideas 
> gratefully accepted!
> 
> Thanks,
> Greg.
> 
> 
> Greg Luker
> GIS Lab Manager, Southern Cross University
> Lismore, AUSTRALIA.
> gluker at scu.edu.au 
> phone 61 2 66203026
> 
> 
> 
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