Question

I am trying to generate the og:description tag, required by Facebook, dynamically out of the content of the shown page. My idea is to use the content-text of the page if there is no meta description given. I tried this script:

page.headerData.838 = CONTENT
page.headerData.838 {
  table=tt_content
  select {
    where = (CType = "text")
  }
  renderObj=TEXT
  renderObj{
    field=bodytext
    stdWrap.stripHtml=1
    noTrimWrap =|<meta property="og:description" content="|" />| 
  }
} 

The problem is that this tag not even appears on the page. So what’s the catch?

Answer 1

Try this…

Default Description:

page.meta{
  description.field = description
}

Description if Default Description is empty:

page.meta.description.ifEmpty.stdWrap.cObject = CONTENT
page.meta.description.ifEmpty.stdWrap.cObject {
 table= tt_content
 select {              
   selectFields = bodytext
 }
 renderObj =COA
 renderObj {
   10=TEXT
   10 {
     field = bodytext     
     stripHtml=1
     crop = 300 | ... | 1        
   }
 }
}

And og:description:

temp.OpenGraphDescription = COA
temp.OpenGraphDescription{
 10=CONTENT
 10.table= tt_content
 10.select {              
   selectFields = bodytext
 }
 10.renderObj =COA
 10.renderObj {
   10=TEXT
   10 {
     field =  bodytext     
     stripHtml=1
     crop = 300 | ... | 1        
   }
 }
 wrap = <meta property="og:description" content="|" />
}
page.headerData.55 < temp.OpenGraphDescription