榆树 - 输入类型复选框

Question

我正在尝试type为输入设置属性:

input [ type "checkbox" ] []

但是我收到一个错误:

It looks like the keyword `type` is being used as a variable.
input [ type "checkbox" ] []
       ^
Rename it to something else.

当我尝试使用时

input [ type' "checkbox" ] []

我收到此错误:

Ran into a single quote in a variable name. This was removed in 0.18!
input [ type' "checkbox" ] []
       ^
Change it to a number or an underscore, like type_ or type1
Or better yet, choose a more descriptive name!

如果我试试

input [ type_ "checkbox" ] []

我收到另一个错误:

Cannot find variable `type_`
input [ type_ "checkbox" ] []
        ^^^^^

那我怎么能最终设置这个属性呢？

Answer 1

确实命名了正确的函数type_并且它位于Html.Attributes模块中.确保您正确导入它.

-- this exposed type_, checked, and value (as examples)
import Html.Attributes exposing (type_, checked, value)

-- alternatively, to expose everything,
import Html.Attributes exposing (..)

Answer 2

看起来您在elm文件中缺少import语句,您可以通过导入该属性

import Html.Attributes exposing (type_)

或者,只需导入所有内容,就像这样

import Html.Attributes exposing (..)

那么你发布的例子就可以了.

input [ type_ "checkbox" ] []

当我在elm中编写html并且需要查找某些东西时,我喜欢做的是使用此站点,在右上角我可以搜索我正在寻找的东西.甚至完整的例子!:)

快乐的Elming!