基于行为的动态元素在threepenny-gui中 [英] Dynamic Elements based on Behaviour in threepenny-gui
问题描述
行为(UI元素)
。 我的实际使用情况是显示一个可以过滤的表格。所以我有一个函数 tableElement :: String - > UI元素
(作为过滤条件的 String
参数)和输入字段 filterElement :: Element $ c $代表过滤器的c>。
bFilter< - stepper(valueChange filterElement)
displaySomehow(fmap tableElement bFilter)
这也是在Elm中完成的方式。
到目前为止我发现的最接近的东西是使用汇儿童
,但只适用于 [元素]
,而不是
用三个penny-gui来实现这样的事情最好的方法是什么?
(作者在这里)
c> UI元素表示一个 action ,执行时可以创建 new 元素
。您将不得不执行后者的操作。不幸的是,目前没有办法在FRP风格中完全实现这一点,只要过滤器发生变化,您将不得不求助于 onChanges
组合器重新创建表。在那里,您可以使用 set children
。
示例:
onChanges bFilter $ \s - > do
el< - tableElement s
myTable#sink children [el]
Bartab.hs 和 CRUD.hs 的例子可能与您的情况有关。
To put it simple, I am looking for a way to display a Behaviour (UI Element)
.
My actual use-case is displaying a table, which can be filtered. So I have a function tableElement :: String -> UI Element
(the String
parameter being the filter condition) and an input field filterElement :: Element
, which represents the filter. The most natural way for me to combine these would be something like this:
bFilter <- stepper "" (valueChange filterElement)
displaySomehow (fmap tableElement bFilter)
This is also the way it is done in Elm.
The closest thing I have found so far is using sink children
, but that works only with [Element]
and not with [UI Element]
. Additionally I have to use a dummy element as parent or fiddle around with the remaining children.
What would be the best way to to implement something like this with threepenny-gui?
(Author here)
Note that UI Element
represents an action that, when executed, may create a new Element
. You will have to execute the action to do the latter. Unfortunately, there is currently no way to do that completely within the FRP style, you will have to resort to the onChanges
combinator to create the table anew whenever the filter changes. There, you can use set children
.
Example:
onChanges bFilter $ \s -> do
el <- tableElement s
myTable # sink children [el]
The Bartab.hs and CRUD.hs examples may be relevant for your situation.
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