Passing Data between app.post to app.get in nodejs - node.js

Question

I am fairly new to nodejs and express. I am using nodejs and handlebars to create a simple back end CRUD App. Right now I am stuck on how to pass the value from a form I created in handlebars to an app.get function in my index.js file so inside my app.get function I can use the value to do a database query. After I do the query I want to display the results using app.get and render it to web page.
This is my Handlebars code:
<section id="main" class="wrapper">
<div id="view" class="container">
<section id="main" class="wrapper">
<div id="class" class="container">
<div class="card-body">
<form action="/getid/submit" method="POST">
<div class="form-group">
<label for="id"></label>
<input type="text" class="form-control" id="id" name="id"
placeholder="Enter ID">
</div>
<button type="submit" class="btn btn-primary">Enter ID</button>
</form>
</div>
</div>
</section>
This is the post function in index.js
app.post('/getid/submit',(req,res)=>{
const id = req.body.id;
console.log(id);
res.redirect('page1');
});
This is the app.get function:
app.get('/view/id',(req,res)=>{
//id = ?
var sql = `SELECT * FROM class WHERE Id =${id}`;
db.query(sql,function (err,result){
if(err) throw error;
res.render('page2',{title: 'test', items: rows})
});
});
My main question would be How do I pass the value that I am getting from the app.post form to my app.get function so I can run the query with that ID and render the values to the webpage. THank you in advance.

Answer 1

The id you need to achieve is in request parameters. So you should try:
app.get('/view/:id', (req, res) => {
//id = ?
const id = req.params.id
var sql = `SELECT * FROM class WHERE Id =${id}`;
db.query(sql, function (err, result) {
if (err) throw error;
res.render('page2', { title: 'test', items: rows })
});
});