jSpreadsheet plugin OpenFile :

Click on icon folder_open for select and load local file

plugins: [
         { name:'openFile', plugin:jss_openFile},
],

This plugin is a premium plugin available on Repo of JSpreadsheet plugins

Download full version of openFile Documentation

you can try this plugin in limited version in your jspreadsheet in localhost :

<script src="https://demo.gbonnaire.fr/dist/jexcel.openfile.js"></script>