R-Shiny中动态创建的TabItems中的错误

Question

我使用动态方式创建UI，但是，某些选项卡是静态的。这对于侧边栏效果很好：

    myTabs = lapply(names(datalist) , function(i) {
        menuItem(i, tabName = paste0("tab_", i))       
    })


    myTabs = list(menuItem("Welcome", tabName = "welcome"),
                  myTabs,
                  menuItem("Country Comparison", tabName = "comparison"),
                  menuItem("Sources & Raw Data", tabName = "sources")
    )

    do.call(sidebarMenu, myTabs)

我希望它对于tabItems也能起作用：

    myTabs = lapply(names(datalist) , function(i) {

        tabItem(tabName = paste0("tab_", i),
            uiOutput(paste0("overviewlist",i)),
            uiOutput(paste0("box1_",i)),
            uiOutput(paste0("box2_",i)), 
            box(width = 12,
                highchartOutput(paste0("spendingpa_",i))
            ),
            uiOutput(paste0("top10print_",i)),
            uiOutput(paste0("top10online_",i))
        )
    })

    myTabs = list(tabItem(tabName = "welcome",
                          box(width = 6)
                          ),
                  myTabs,
                  tabItem(tabName = "comparison",
                          box(width = 6)),
                  tabItem(tabName = "sources",
                          box(width = 6))
    )

    do.call(tabItems, myTabs)

只要我不尝试将某些内容添加到列表中，该代码即可正常工作。然后出现以下错误：Error: Expected an object with class 'shiny.tag'.我也尝试打印该列表。用lapply生成后，似乎无法将其他项目添加到myTabs列表中。有人知道如何处理吗？