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Dash.jl

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Version 1.5.0

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朱莉娅的破折号

Juila测试

在朱莉娅（Julia）创建美丽的分析应用

建立在plotly.js，react和http.jl之上，破折号将现代的UI元素（如下拉列表，滑块和图形）直接与您的分析朱莉娅代码直接相关。

刚开始？查看朱莉娅用户指南的破折号！如果您在那里找不到文档，请查看非官方的贡献示例或查看Python中的演示应用程序的源代码，然后参考Julia Syntax样式。

其他资源

https://community.plotly.com/c/plotly-r-matlab-julia-net/julia/23
https://discourse.julialang.org/tag/dash

项目状态

可以与Python和R组件同时生成Julia组件。有兴趣参与该项目吗？赞助是加速这样的开源项目进度的好方法。请随时与我们联系！

安装

要安装最近发布的版本：

pkg > add Dash

改用最新（稳定）开发版本：

pkg > add Dash # dev

用法

基本应用

 using Dash

app = dash (external_stylesheets = [ " https://codepen.io/chriddyp/pen/bWLwgP.css " ])

app . layout = html_div () do
    html_h1 ( " Hello Dash " ),
    html_div ( " Dash.jl: Julia interface for Dash " ),
    dcc_graph (id = " example-graph " ,
              figure = (
                  data = [
                      (x = [ 1 , 2 , 3 ], y = [ 4 , 1 , 2 ], type = " bar " , name = " SF " ),
                      (x = [ 1 , 2 , 3 ], y = [ 2 , 4 , 5 ], type = " bar " , name = " Montréal " ),
                  ],
                  layout = (title = " Dash Data Visualization " ,)
              ))
end

run_server (app)

然后在浏览器中访问http://127.0.0.1:8050 ，以查看DASH应用程序！

基本回调

 using Dash

app = dash (external_stylesheets = [ " https://codepen.io/chriddyp/pen/bWLwgP.css " ])

app . layout = html_div () do
    dcc_input (id = " my-id " , value = " initial value " , type = " text " ),
    html_div (id = " my-div " )
end

callback! (app, Output ( " my-div " , " children " ), Input ( " my-id " , " value " )) do input_value
    " You've entered $(input_value) "
end

run_server (app)

您可以通过在callback!功能。
该对象的输出， Input ， State对象或媒介可以Output ，输出和输入（及状态，请参见下文）。
回调函数必须具有签名(inputs..., states...) ，并提供一个返回值，其数字元素与要更新的Output数量相同。

状态和多个输出

 using Dash

app = dash (external_stylesheets = [ " https://codepen.io/chriddyp/pen/bWLwgP.css " ])

app . layout = html_div () do
    dcc_input (id = " my-id " , value = " initial value " , type = " text " ),
    html_div (id = " my-div " ),
    html_div (id = " my-div2 " )
end

callback! (app,
          Output ( " my-div " , " children " ),
          Output ( " my-div2 " , " children " ),
          Input ( " my-id " , " value " ),
          State ( " my-id " , " type " )) do input_value, state_value
    return ( " You've entered $(input_value) in input with type $(state_value) " ,
            " You've entered $(input_value) " )
end

run_server (app)

与原始Python语法进行比较

组件命名

Python：

 import dash

dash . html . Div
dash . dcc . Graph
dash . dash_table . DataTable

dash.jl：

 using Dash

html_div
dcc_graph
dash_datatable

组件创建

就像在Python中一样，声明组件的函数具有关键字参数，与Python相同。 html_div(id = "my-id", children = "Simple text") 。

对于宣布children组件，还有两个额外的签名：

(children; kwargs..)和
(children_maker::Function; kwargs...)

因此，可以为简单元素编写html_div("Simple text", id = "my-id") ，或者使用do语法选择复杂元素的缩写语法：

 html_div (id = " outer-div " ) do
    html_h1 ( " Welcome " ),
    html_div (id = " inner-div " ) do
        #= inner content =#
    end
end

应用和布局

Python：

 app = dash . Dash ( external_stylesheets = [ "https://codepen.io/chriddyp/pen/bWLwgP.css" ])

app . layout = html . Div ( children = [....])

dash.jl：

app = dash (external_stylesheets = [ " https://codepen.io/chriddyp/pen/bWLwgP.css " ])

app . layout = html_div () do
    #= inner content =#
end

回调

Python：

 @ app . callback ( Output ( 'output' , 'children' ),
              Input ( 'submit-button' , 'n_clicks' )],
              State ( 'state-1' , 'value' ),
              State ( 'state-2' , 'value' ))
def update_output ( n_clicks , state1 , state2 ):
    # logic

dash.jl：

 callback! (app,
          Output ( " output " , " children " ),
          Input ( " submit-button " , " n_clicks " )],
          State ( " state-1 " , " value " ),
          State ( " state-2 " , " value " )) do n_clicks, state1, state2
    # logic
end