<if> Examples
<if> Basics
At a minimum, you define <if> with a condition and add statements inside <if>, such as the following example:
<variables>
<variable name="destination" type="document"/>
<variable name="importRules" type="document"/>
<variable name="currentCountry" type="string"/>
<variable name="local" type="string" default="US"/>
</variables>
...
<if condition="$destination//country != $local">
<invoke service="ImportRules" operation="getRules"
inputvariables="currentCountry" outputvariable="$importRules"/>
</if>
Adding <elseif> or <else>
To include additional conditions, add <elseif> or <else> elements as children of <if>. You can have any number of <elseif> statements. For example:
<if condition="$sortingType/sortBy = 'date'">
<sort intputvariable="$tasks" sortexpr="/task" sortkeys="dueDate"
outputvariable="$tasks"/>
<elseif condition="$sortingType/sortBy = ’name’">
<sort intputvariable="$tasks" sortexpr="/task" sortkeys="description"
outputvariable="$tasks"/>
</elseif>
<else>
<sort intputvariable="$tasks" sortexpr="/task" sortkeys="priority"
outputvariable="$tasks"/>
</else>
</if>
Breaking
When <if> is inside a looping statement (<for>, <foreach> or <while>), you can also use <break/> inside <if> or <elseif> to stop all subsequent processing for this loop and any further looping.
For examples using <break/>, see the
<break> statement.
Working Samples
The following sample mashups use the <if> statement:
FaultHandlingSample (
faulthandling.emml)
MyGooglePage (
igoogle.emml)
LevenshteinDistanceJoine (
levend.emml)
ErrorHandlingSample (
onerror.emml)
WhileSample (
while.emml)
See
Mashup Samples for a list of
Presto mashup samples and where to find them.
