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This comes very handy when you want to display an element on the website only when there is content for it. This can be done with the following typoscript code:
temp.maintemplate = COA temp.maintemplate { # if there is content in the right col 10 = COA 10 { if.isTrue.numRows < styles.content.getRight 10 = TEMPLATE 10 { template = FILE template.file = fileadmin/2cols.html } } # if there is NO content in the right col 20 = COA 20 { if.isFalse.numRows < styles.content.getRight 10 = TEMPLATE 10 { template = FILE template.file = fileadmin/1col.html } } }