How to pass function as variable in Express-handlebars - node.js

Question

I am trying to pass a function as a variable and call that function using onclick=""
but the function is executing before passing.
Here is the code.
seminar.js
function getco(){
console.log('hello');
}
router.get('/add',(req,res)=>{
res.render('cms/seminar/add',{
getco:getco()
});
});
add.handlebars
<form action="/cms/seminar/add" method="post">
<div class="form-group">
<label for="sel1">Game Name of the Seminar</label>
<select class="form-control" id="seminar_gamename" name="seminar_gamename" required onclick="getco">
<option value="pubg">Pubg</option>
<option value="candy_crush">Candy Crush</option>
<option value="fortnite">Fortnite</option>
<option value="mortal_combat">Mortal Combat 11</option>
<option value="far_cry_city">Far Cry City Dowm</option>
<option value="fortnite">Fortnite</option>
<option value="prince_of_persia">Prince of Persia:The Forgotten Sand</option>
</select>
</div>
</form>
//But the result im getting is 'hello' without even clicking

Answer 1

As mentioned in the comment above you are directly calling the function instead of passing it to frontend.
Try removing () from getco
`function getco(){
console.log('hello');
}
router.get('/add',(req,res)=>{
res.render('cms/seminar/add',{
getco:getco
});
});`
This allows you to pass the method as a variable and then in frontend use,
onclick="getco()"