从dash回调调用javascript函数

我一直在努力在我的dash应用程序中生成一个模态。我确实将.css和.js文件都放在了assets文件夹中，但我不确定在回调中调用.js函数的语法是什么，.js函数接受一个.css参数，然后激活它，因此它会根据更正的文件是否

.css文件，其中包含模式代码

.popup_File {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, 50%) scale(0);
  transition: 500ms ease-in-out;
  border: 1px solid black;
  border-radius: 10px;
  z-index: 10px;
  width: 500px;
  max-width: 80%;
}
.popup_File.active{
  transform: translate(-50%, 50%) scale(1);
}

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.js编码用于在css文件中激活模式的Javascript函数

function openmodal(popup){
  if (popup == null) return
  popup.classList.add('active')
  document.write('see')
}

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我希望实际激活css模式的回调（请参见注释）->

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我一直在努力寻找要使用的正确语法，以及如何放置.js代码，并使用Python dash中的正确参数调用assets文件夹中的函数。请帮忙 import dash_bootstrap_components as dbc import dash_bootstrap_components as dbc import dash_core_components as dcc import dash_html_components as html from dash.dependencies import Input, Output, State, ClientsideFunction app = dash.Dash(__name__, external_stylesheets=[dbc.themes.JOURNAL]) app.layout = html.Div( className = 'popup_File', id = 'Wrong_file', children = [ html.Div( className = 'header', children = [ html.Div("Invalid file type", className = 'title'), html.Button('&times', className = 'Close_wrongFile', id = 'File')]), html.Div('The file you have uploaded does not have the vcf file extension.', className = 'Warning_wrongfile') ] ) #Call back for checking uploaded file @app.callback( Output('place_Filename', 'children'), [Input('VCF', 'contents')], [State('VCF', 'filename')] ) def VCF_processing(contents, filename): if filename is None: layout = html.Div( [ html.H6( 'Drag and Drop .vcf ' ) ] ) return layout else: if '.vcf' not in filename: #... I want to call the .js function here to tell the user that an incorrect file has been uploaded return warning modal if __name__ == '__main__': app.run_server(debug=False)