Velocity if statement is type sensitive…
Problem
I discovered that comparisons in Velocity if statements are type-sensitive the hard way.
For example, I am trying to display the 'selected' option in a html <SELECT> object. The list of possible values is $list, each is a simple 'NameValuePair' value object { String name, String value }.
The object I am editing in this form is $obj, and the field I am testing against is $obj.typeId defined as a long.
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<select name='typeId' value='$!{obj.typeId}'>
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#foreach ( $item in $list )
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#if ( $item.value == $obj.typeId )
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<option value='$item.value' selected='true'>$item.name</option>
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#else
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<option value='$item.value'>$item.name</option>
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#end
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#end
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</select>
However, the if statement on line 3 is actually comparing a String to a long which are of course never going to be equal.
Solution
The easiest work around in this case was to convert the $obj.typeId into a String before the comparison.
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<select name='typeId' value='$!{obj.typeId}'>
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#set ( $typeId = "$!{obj.typeId}" )
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#foreach ( $item in $list )
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#if ( $item.value == $typeId )
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<option value='$item.value' selected='true'>$item.name</option>
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#else
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<option value='$item.value'>$item.name</option>
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#end
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#end
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</select>
Any comments / feedback welcomed