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==== Making data fields optional ==== A row with a label but no data is not displayed. This allows for the easy creation of optional infobox content rows. To make a row optional use a parameter that defaults to an empty string, like so: <pre style="overflow:auto"> | label5 = Population | data5 = {{{population|}}} </pre>{{clear}} This way if an article doesn't define the population parameter in its infobox the row won't be displayed. For more complex fields with pre-formatted contents that would still be present even if the parameter wasn't set, you can wrap it all in an "#if" statement to make the whole thing vanish when the parameter is not used. For instance, the "#if" statement in the following example reads "#if:the parameter ''mass'' has been supplied |then display it, followed by 'kg'": <pre style="overflow:auto"> | label6 = Mass | data6 = {{ #if: {{{mass|}}} | {{{mass}}} kg }} </pre>{{clear}} For more on #if, see [[meta:ParserFunctions##if:|here]].
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