getValueFrom

For interoperability with other systems it is interesting to have the possibility to use dynamic values in the xml configuration file.

For example: One system is used to create a new feature with passes an attibute proprety in the url.

To allow this kind of interoperability it is possible to replace a fixed value in some xml nodes with a special <getValueFrom> tag that allows to get a value from any php variable table.

Use

<!-- fixed option -->
<option>value</option>

<!-- dynamique value -->
<option>
    <getValueFrom>$_REQUEST[param]</getValueFrom>
</option>
<option>
    <getValueFrom>$_POST[firstname] $_POST[lastname]</getValueFrom>
</option>
<option>
    <getValueFrom>$GLOBALS[lang]</getValueFrom>
</option>
<option>
    <getValueFrom>$SESSION[username]</getValueFrom>
</option>
<option>
    <getValueFrom>He is now" . date() . "</getValueFrom>
</option>

Implementation

The values set in getValueFrom tag are put into a string and are evaluated with the ‘eval’ php function.

Php code can then be used to return the desired value dynamically.

P.S : All widgets that use nodes loaded with getObjectFromNode are automatically compatible with getValueFrom (e.g. featurepanel_form fields)

Sample

• Use ‘getValueFrom’ with the stylemap option of the map widget to colorize features with a attribute value equal to that passed along in the url.

  <stylemap>
      <renderers>
          <renderer>
              <renderintent>default</renderintent>
              <style>
                  <fillcolor>${getColor}</fillcolor>
                  <strokecolor>${getColor}</strokecolor>
                  <context>
                      <functions>
                          <fidegualfunction>
                              <name>getColor</name>
                              <egual>
                                  <getValueFrom>$_REQUEST[id]</getValueFrom>   <!-- <<<<<<<<<<<<< Here <<<<<<<<<<<<  -->
                              </egual>
                              <result>#FF00FF</result>
                              <defaultresult>#00FFFF</defaultresult>
                          </fidegualfunction>
                      </functions>
                  </context>
              </style>
          </renderer>
      </renderers>
  </stylemap>
  

• Use ‘getValueFrom’ with the ‘editfeature_create’ and ‘featurepanel_form’ widgets to add features with an attribute value obtained from the url.

  <editfeature_create>
      <name>CreateDumpingSite</name>
      <options>
          <geometrytype>Polygon</geometrytype>
          <featurepanel>FeaturePanel1</featurepanel>
      </options>
  </editfeature_create>
  
  <featurepanel_form>
      <name>FeaturePanel1</name>
      <options>
          <inwindow>true</inwindow>
          <windowoffset>
              <left>100</left>
          </windowoffset>
          <windowoptions>
              <title>
                  <en_US>Dumping Site</en_US>
                  <fr_CA>Site de déversement</fr_CA>
              </title>
              <autoScroll>false</autoScroll>
          </windowoptions>
          <defaults>
              <width>100</width>
          </defaults>
          <fields>
              <field>
                  <name>dumpingid</name>
                  <xtype>displayfield</xtype>
                  <value>
                      <getValueFrom>$_REQUEST[id]</getValueFrom>  <!-- <<<<<<<<<<<<< Here <<<<<<<<<<<<  -->
                  </value>
              </field>
          </fields>
      </options>
  </featurepanel_form>