Make a google Script Run from a HTML front - html

Question

I have a script that will run an HTTP request to our server and bring the most recent orders.
We want to be able to run the script on request but also be able to Install it as an addon to different sheets for our different stores
The front End of the app is generated by this html
<link href="https://ssl.gstatic.com/docs/script/css/add-ons.css"
rel="stylesheet">
<div class="sidebar">
<div class="block form-group">
<button class="blue" id="load_orders">Import Order Data</button>
</div>
<div id='orders'></div>
</div>
<script>
$(function onSuccess(load_orders) {
});
withSuccessHandler(onSuccess).importcogs();
});
</script>
Then on the .gs I have a script to show the app (before we Deploy it) and the import orders script
function onInstall() {
onOpen();
}
function onOpen() {
SpreadsheetApp.getUi()
.createAddonMenu() // Add a new option in the Google Docs Add-ons Menu
.addItem("Import Order Data", "showSidebar")
.addToUi(); // Run the showSidebar function when someone clicks the menu
}
function showSidebar() {
var html = HtmlService.createTemplateFromFile("Front")
.evaluate()
.setTitle("Import Order - Search"); // The title shows in the sidebar
SpreadsheetApp.getUi().showSidebar(html);
}
function importcogs() {
Logger.log("import begin");
var ss = SpreadsheetApp.getActiveSpreadsheet();
var urlsheet = ss.getSheetByName("GetInfo");
var request = urlsheet.getRange(5,2).getValue();
Logger.log(request);
var response = UrlFetchApp.fetch(request);
Logger.log("download data finish");
Logger.log(response.getContentText());
var sheet = ss.getSheetByName("Data");
var obj = JSON.parse(response);
let vs = obj.data.map(o => Object.values(o));//data
vs.unshift(Object.keys(obj.data[0]));//add header
sheet.getRange(1,1,vs.length, vs[0].length).setValues(vs);//output to spreadsheet
}
I Haven't been able to link the "Import orders" button to the script for some reason .

Answer 1

As what Cooper has said in the above comment, it is not a standalone function:
Sample Usage:
google.script.run.withSuccessHandler(onSuccess).importcogs();
This will in return runs the importcogs function and will trigger onSuccess function if the function successfully finished. Parameters of the onSuccess will be the return of the function called importcogs if it has any.