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As of Weave 2.6.6, it’s possible to define filters that can be associated with a map layer. The filters are used when the layer is drawn to refine the set of features that will be rendered for the layer. Additionally, a new client panel allows the user to dynamically alter the filter, giving them the ability to dynamically refine the features displayed on the map.

This is similar to the search panel where the user can enter certain criteria to select a set of entities, but in this case, the input the user enters is used to refine the set of features displayed on the map. For example, if the map contains a layer representing the public reserves, a filter could be created for the reserves layer that allows the user to display only those reserves containing a specific facility or facilities, i.e. only those reserves with barbeques and/or public toilets.

The panel to include in the client to allow the user to alter the filters has the id weave.layerFilter.

The client UI for the filtering contains a couple of new controls that were not previously available with other input forms, the slider and multi-slider. These controls are useful for layer filtering because they provide an easier way to constrain a numeric value to a certain range. But they’re also different in that they force a value to be chosen, that is a filter that uses a slider for a value will always have that value applied when displaying the layer. This can be important when the table behind the layer contains a number of “sets” of data but only one should be displayed at a time, and the column behind the parameter is used to separate out the data into the various sets. A example of this could be the year when the data in the table was generated and the user would only want to see a single year at a time, or for a layer with flood levels and you only want to show a single depth.

In addition to the filter panel, there is also a ToC panel context menu item, weave.toc.filterLayer. This can be added to the ToC panel context menu to allow the user to filter a layer directly. It’s recommended that the layer filtering capability is provided either in the filter panel or context menu in a client and not both (as providing both could result in display synchronisation issues).

Finally, there is a new flag available for the ToC panel, showFilterIcon, which when set to true will place an indicator icon next to a layer in the ToC that currently has a filter applied.

Current limitations

There can be only one filter associated with a particular map layer, this is unlikely to change.

The filtering only affects the display of the layer on the map, it plays no part for example if the user tries to spatially select entities that are associated with that layer (this may change depending upon demand) or when displaying a legend.

Configuration

Namespace

urn:com.cohga.weave.map.filter#1.0

Tags

layer


Properties

Name

Type

Required

Description

id

string

yes

Unique identifier for this filter

label

string

yes

Text to be displayed to the user to represent this filter

mapengine

string

yes

The identifier of the map engine the layer to filter belongs to

layer

string

yes

The identifier of the layer in the map engine this filter applies to

Sub-tags

Name

Type

Cardinality

parameter

urn:com.cohga.weave.map.filter#1.0:parameter

1..n

parameter


Properties

Name

Type

Required

Default

Description

id

string

yes


A unique identifier for the parameter

label

string

yes


The prompt text displayed when user input the parameter value

column

string

yes


The name of the column within the layer that this parameter references.

controlType

'text', '‘list', 'radio', ‘check', ‘multicheck’, 'silder’, 'multislider’

no

'text'

The UI control to use when displaying the parameter

dataType

'boolean', 'float', 'integer', 'string'

no

'string'

The data type for the parameter

allowBlank

boolean

no

true

Give the user the choice of an empty value in the listbox (as opposed to a null value)

value

any

no


The default value of the parameter (except multislider fields)

dataSet

ref urn:com.cohga.server.data.database#1.0:datadefinition

no


Where to get the values for a listbox

labelColumn

string

no


Column in the datadefinition that supplies the label of the value to show the user

valueColumn

string

no


Column in the datadefinition that supplies the value of the value to use in the SQL

scalarparametertype

string

no

'simple'

'simple' or 'multi-value' to determine of more than one value can be selected from a list.

width

integer

no


Set the width of the field

minValue

number

yes - for slider and multislider


The minimum value allowed for a numeric field.

maxValue

number

yes - for slider and multislider


The maximum value allowed for a numeric field.

leftValue

number

no

The initial minimum value for a multislider

rightValue

number

no

The initial maximum value for a multislider

increment

number

no


The increment to use for fields that support it, the units are dependant upon the field type.

trueValue

any

no


The value that equates to "true" in the underlying table, only suitable for checkboxes

falseValue

any

no


The value that equates to "false" in the underlying table, only suitable for checkboxes

decimalPrecision

number

no

The precision of any numeric fields

Sub-tags

Name

Type

Cardinality

list

urn:com.cohga.weave.map.filter#1.0:list

1..1 - only for radio and multicheck fields

list


Properties

Name

Type

Required

Description

value

string

yes

Value to be used in the filter

label

string

yes

Text to be displayed to the user to represent this filter

checked

string

no

Should this check box be initially checked. Only for list within multicheck field

Examples

<?xml version="1.0" encoding="UTF-8"?>

<config xmlns="urn:com.cohga.server.config#1.0"
        xmlns:filter="urn:com.cohga.weave.map.filter#1.0"
        xmlns:data="urn:com.cohga.server.data.database#1.0">

  <!-- provide the values for the title names list -->
  <data:datadefinition id="titles.names">
    <datasourcedataconnection datasource="main" table="TITLES" prefix="DISTINCT">
      <parameter name="title_name" label="Title Name" column="TITLENAME"/>
    </datasourcedataconnection>
  </data:datadefinition>

  <!-- create a simple list parameter to filter on title name -->
  <filter:layer id="titles">
    <label>Titles</label>
    <mapengine>main</mapengine>
    <layer>titles</layer>
    <parameter id="name" label="Name" controlType="list" scalarParameterType="multi-value"
      dataSet="titles.names" column="TITLENAME"/>
  </filter:layer>

</config>

<!-- parameter examples -->

<!-- a parameter representing a floating point value between 2.5 and 26 with an increment of 0.5
and default value of 13 -->
  <parameter id="level">
    <label>Level (m)</label>
    <controlType>slider</controlType>
    <dataType>float</dataType>
    <column>Level_mGH</column>
    <minValue>2.5</minValue>
    <maxValue>26</maxValue>
    <value>13</value>
    <increment>0.5</increment>
    <decimalPrecision>1</decimalPrecision>
  </parameter>

<!-- a parameter representing an integer value between 2011 and 2019 inclusive 
with a default minimum of 2015 and default maximum of 2018 -->
  <parameter id="study_year">
    <label>Study Year</label>
    <controlType>multislider</controlType>
    <dataType>int</dataType>
    <column>Study_year</column>
    <minValue>2011</minValue>
    <maxValue>2019</maxValue>
    <leftValue>2015</leftValue>
    <rightValue>2018</rightValue>
  </parameter>

<!-- multiple grouped check boxes. Note in this case all checked boxes start as checked
but if none of the check boxes are checked all items would be displayed as well -->
  <parameter id="location">
    <label>Location</label>
    <controlType>multicheck</controlType>
    <column>Location</column>
    <dataType>string</dataType>
    <list label="Catchment, Todd" value="Todd Catchment" checked="true"/>
    <list label="River, Adelaide" value="Adelaide River" checked="true"/>
    <list label="River, McArthur" value="McArthur River" checked="true"/>
  </parameter>

<!-- single check box. Note in this case since we've set a different true value
when this check box is checked the filter applied will be "Location='Adelaide River'"
rather than "Location=true" as would be the case if trueValue were not set -->
  <parameter id="location">
    <label>Adelaide River Only</label>
    <controlType>check</controlType>
    <column>Location</column>
    <dataType>string</dataType>
    <trueValue>Adelaide River</trueValue>
  </parameter>

<!-- radio button -->
  <parameter id="location">
    <label>Location</label>
    <controlType>radio</controlType>
    <column>Location</column>
    <dataType>string</dataType>
    <value>Adelaide River</value>
    <list label="Catchment, Todd" value="Todd Catchment"/>
    <list label="River, Adelaide" value="Adelaide River"/>
    <list label="River, McArthur" value="McArthur River"/>
  </parameter>

<!-- list box -->
  <parameter id="location">
    <label>Location</label>
    <controlType>list</controlType>
    <dataSet>locations</dataSet>
    <column>Location</column>
    <dataType>string</dataType>
  </parameter>

<!-- a basic text box. Note this format is discouraged as the user has no way of knowing 
if the value they're entering is valid and may result in nothing being displayed -->
  <parameter id="location">
      <label>Location</label>
      <controlType>text</controlType>
      <column>Location</column>
    <dataType>string</dataType>
  </parameter>

Client

	<client:config id="filtering">
		<title>Example Filtering client</title>

		<!-- other config here -->

		<view id="weave.layerFilter">
			<location>east</location>
		</view>

		<!-- other config here -->

		<view id="com.cohga.html.client.map.tocView">
			<location>west</location>
			<label>Layers</label>
			<showFilterIcon>true</showFilterIcon>
			<contextmenu>
				<item action="weave.toc.filterLayer"/>
			</contextmenu>
		</view>

	</client:config>

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