排版：覆盖多次

Question

我有 3 张图片（内容对象）：

tempProjectImage = IMAGE                                                                  
                tempProjectImage {
                    file{
                        #Nur der erste Eintrag.
                        import.listNum = 0

                        #Datei wird aus DAM gelesen
                        import.cObject = USER                               
                        import.cObject {
                            userFunc = tx_dam_tsfe->fetchFileList
                            refField = project_picture
                            refTable = tx_nmshowroom_items
                        }                            
                        width = 298
                        height = 200                            
                    }

                    altText.field = title
                    titleText.field = title
                    params = class="previewImage"                                                                                                       
                }

tempItemImage = IMAGE                                                                  
                tempItemImage {
                    file{
                        #Nur der erste Eintrag.
                        import.listNum = 0

                        #Datei wird aus DAM gelesen
                        import.cObject = USER                               
                        import.cObject {
                            userFunc = tx_dam_tsfe->fetchFileList
                            refField = images
                            refTable = tx_nmshowroom_items
                        }                            
                        width = 298
                        height = 200                            
                    }

                    altText.field = title
                    titleText.field = title
                    params = class="previewImage"                                                                                                       
                }

custImage = IMAGE
                    custImage {
                        file{
                            #Nur der erste Eintrag.
                            import.listNum = 0

                            #Datei wird aus DAM gelesen
                            import.cObject = USER                               
                            import.cObject = USER                               
                            import.cObject {
                                userFunc = tx_dam_tsfe->fetchFileList
                                refField = images
                                refTable = tx_nmshowroom_customers
                                refUid.field = tx_nmshowroom_customers
                            }                        
                            width = 298
                            height = 200                            
                        }

                        altText.field = title
                        titleText.field = title
                        params = class="previewImage"                                                                                                       
                    }

在我的 HTML 模板中

###IMAGE###

我想做的是一种多重覆盖：

如果 tempItemImage 为空，则显示 tempProjectImage，如果 tempProjectImage 也为空，则显示 custImage。

我开始：

image < .customers.custImage
image.file.import.override.cObject < .tempProjectImage.file.import.cObject

这很完美。但是当我添加另一个覆盖时：

image < .customers.custImage
image.file.import.override.cObject < .tempProjectImage.file.import.cObject
image.file.import.override.cObject < .tempItemImage.file.import.cObject

它不再起作用了。 tempItemImage（如果存在）永远不会覆盖其他图像。

我做错了什么？

提前致谢， 大卫

Answer 1

有一个 stdWrap 函数“ifEmpty”，我想这适合你想做的事情。

（未经测试）

# you need only one IMAGE object,
# but you add an ifEmpty statement, two times with
# the fall back USER-Object
tempProjectImage = IMAGE                                                                  
tempProjectImage {
  file{
    import.listNum = 0
    import.cObject = USER                               
    import.cObject {
      # default
    }
    import.ifEmpty.cObject = USER
    import.ifEmpty.cObject {
       # Fallback 
    }
    import.ifEmpty.ifEmpty.cObject = USER
    import.ifEmpty.ifEmpty.cObject {
       # second fallback
    }
  }
}